auto import from //depot/cupcake/@135843
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
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+++ b/core/java/android/view/View.java
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+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.view;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.LinearGradient;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
+import android.graphics.Rect;
+import android.graphics.Region;
+import android.graphics.Shader;
+import android.graphics.Point;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Message;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.os.RemoteException;
+import android.os.SystemClock;
+import android.os.SystemProperties;
+import android.util.AttributeSet;
+import android.util.EventLog;
+import android.util.Log;
+import android.util.SparseArray;
+import android.view.ContextMenu.ContextMenuInfo;
+import android.view.animation.Animation;
+import android.view.inputmethod.InputConnection;
+import android.view.inputmethod.InputMethodManager;
+import android.view.inputmethod.EditorInfo;
+import android.widget.ScrollBarDrawable;
+
+import com.android.internal.R;
+import com.android.internal.view.menu.MenuBuilder;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.lang.ref.SoftReference;
+
+/**
+ * <p>
+ * This class represents the basic building block for user interface components. A View
+ * occupies a rectangular area on the screen and is responsible for drawing and
+ * event handling. View is the base class for <em>widgets</em>, which are
+ * used to create interactive UI components (buttons, text fields, etc.). The
+ * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which
+ * are invisible containers that hold other Views (or other ViewGroups) and define
+ * their layout properties.
+ * </p>
+ *
+ * <div class="special">
+ * <p>For an introduction to using this class to develop your
+ * application's user interface, read the Developer Guide documentation on
+ * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics
+ * include:
+ * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a>
+ * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>.
+ * </p>
+ * </div>
+ *
+ * <a name="Using"></a>
+ * <h3>Using Views</h3>
+ * <p>
+ * All of the views in a window are arranged in a single tree. You can add views
+ * either from code or by specifying a tree of views in one or more XML layout
+ * files. There are many specialized subclasses of views that act as controls or
+ * are capable of displaying text, images, or other content.
+ * </p>
+ * <p>
+ * Once you have created a tree of views, there are typically a few types of
+ * common operations you may wish to perform:
+ * <ul>
+ * <li><strong>Set properties:</strong> for example setting the text of a
+ * {@link android.widget.TextView}. The available properties and the methods
+ * that set them will vary among the different subclasses of views. Note that
+ * properties that are known at build time can be set in the XML layout
+ * files.</li>
+ * <li><strong>Set focus:</strong> The framework will handled moving focus in
+ * response to user input. To force focus to a specific view, call
+ * {@link #requestFocus}.</li>
+ * <li><strong>Set up listeners:</strong> Views allow clients to set listeners
+ * that will be notified when something interesting happens to the view. For
+ * example, all views will let you set a listener to be notified when the view
+ * gains or loses focus. You can register such a listener using
+ * {@link #setOnFocusChangeListener}. Other view subclasses offer more
+ * specialized listeners. For example, a Button exposes a listener to notify
+ * clients when the button is clicked.</li>
+ * <li><strong>Set visibility:</strong> You can hide or show views using
+ * {@link #setVisibility}.</li>
+ * </ul>
+ * </p>
+ * <p><em>
+ * Note: The Android framework is responsible for measuring, laying out and
+ * drawing views. You should not call methods that perform these actions on
+ * views yourself unless you are actually implementing a
+ * {@link android.view.ViewGroup}.
+ * </em></p>
+ *
+ * <a name="Lifecycle"></a>
+ * <h3>Implementing a Custom View</h3>
+ *
+ * <p>
+ * To implement a custom view, you will usually begin by providing overrides for
+ * some of the standard methods that the framework calls on all views. You do
+ * not need to override all of these methods. In fact, you can start by just
+ * overriding {@link #onDraw(android.graphics.Canvas)}.
+ * <table border="2" width="85%" align="center" cellpadding="5">
+ * <thead>
+ * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr>
+ * </thead>
+ *
+ * <tbody>
+ * <tr>
+ * <td rowspan="2">Creation</td>
+ * <td>Constructors</td>
+ * <td>There is a form of the constructor that are called when the view
+ * is created from code and a form that is called when the view is
+ * inflated from a layout file. The second form should parse and apply
+ * any attributes defined in the layout file.
+ * </td>
+ * </tr>
+ * <tr>
+ * <td><code>{@link #onFinishInflate()}</code></td>
+ * <td>Called after a view and all of its children has been inflated
+ * from XML.</td>
+ * </tr>
+ *
+ * <tr>
+ * <td rowspan="3">Layout</td>
+ * <td><code>{@link #onMeasure}</code></td>
+ * <td>Called to determine the size requirements for this view and all
+ * of its children.
+ * </td>
+ * </tr>
+ * <tr>
+ * <td><code>{@link #onLayout}</code></td>
+ * <td>Called when this view should assign a size and position to all
+ * of its children.
+ * </td>
+ * </tr>
+ * <tr>
+ * <td><code>{@link #onSizeChanged}</code></td>
+ * <td>Called when the size of this view has changed.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td>Drawing</td>
+ * <td><code>{@link #onDraw}</code></td>
+ * <td>Called when the view should render its content.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td rowspan="4">Event processing</td>
+ * <td><code>{@link #onKeyDown}</code></td>
+ * <td>Called when a new key event occurs.
+ * </td>
+ * </tr>
+ * <tr>
+ * <td><code>{@link #onKeyUp}</code></td>
+ * <td>Called when a key up event occurs.
+ * </td>
+ * </tr>
+ * <tr>
+ * <td><code>{@link #onTrackballEvent}</code></td>
+ * <td>Called when a trackball motion event occurs.
+ * </td>
+ * </tr>
+ * <tr>
+ * <td><code>{@link #onTouchEvent}</code></td>
+ * <td>Called when a touch screen motion event occurs.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td rowspan="2">Focus</td>
+ * <td><code>{@link #onFocusChanged}</code></td>
+ * <td>Called when the view gains or loses focus.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td><code>{@link #onWindowFocusChanged}</code></td>
+ * <td>Called when the window containing the view gains or loses focus.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td rowspan="3">Attaching</td>
+ * <td><code>{@link #onAttachedToWindow()}</code></td>
+ * <td>Called when the view is attached to a window.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td><code>{@link #onDetachedFromWindow}</code></td>
+ * <td>Called when the view is detached from its window.
+ * </td>
+ * </tr>
+ *
+ * <tr>
+ * <td><code>{@link #onWindowVisibilityChanged}</code></td>
+ * <td>Called when the visibility of the window containing the view
+ * has changed.
+ * </td>
+ * </tr>
+ * </tbody>
+ *
+ * </table>
+ * </p>
+ *
+ * <a name="IDs"></a>
+ * <h3>IDs</h3>
+ * Views may have an integer id associated with them. These ids are typically
+ * assigned in the layout XML files, and are used to find specific views within
+ * the view tree. A common pattern is to:
+ * <ul>
+ * <li>Define a Button in the layout file and assign it a unique ID.
+ * <pre>
+ * <Button id="@+id/my_button"
+ * android:layout_width="wrap_content"
+ * android:layout_height="wrap_content"
+ * android:text="@string/my_button_text"/>
+ * </pre></li>
+ * <li>From the onCreate method of an Activity, find the Button
+ * <pre class="prettyprint">
+ * Button myButton = (Button) findViewById(R.id.my_button);
+ * </pre></li>
+ * </ul>
+ * <p>
+ * View IDs need not be unique throughout the tree, but it is good practice to
+ * ensure that they are at least unique within the part of the tree you are
+ * searching.
+ * </p>
+ *
+ * <a name="Position"></a>
+ * <h3>Position</h3>
+ * <p>
+ * The geometry of a view is that of a rectangle. A view has a location,
+ * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and
+ * two dimensions, expressed as a width and a height. The unit for location
+ * and dimensions is the pixel.
+ * </p>
+ *
+ * <p>
+ * It is possible to retrieve the location of a view by invoking the methods
+ * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X,
+ * coordinate of the rectangle representing the view. The latter returns the
+ * top, or Y, coordinate of the rectangle representing the view. These methods
+ * both return the location of the view relative to its parent. For instance,
+ * when getLeft() returns 20, that means the view is located 20 pixels to the
+ * right of the left edge of its direct parent.
+ * </p>
+ *
+ * <p>
+ * In addition, several convenience methods are offered to avoid unnecessary
+ * computations, namely {@link #getRight()} and {@link #getBottom()}.
+ * These methods return the coordinates of the right and bottom edges of the
+ * rectangle representing the view. For instance, calling {@link #getRight()}
+ * is similar to the following computation: <code>getLeft() + getWidth()</code>
+ * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.)
+ * </p>
+ *
+ * <a name="SizePaddingMargins"></a>
+ * <h3>Size, padding and margins</h3>
+ * <p>
+ * The size of a view is expressed with a width and a height. A view actually
+ * possess two pairs of width and height values.
+ * </p>
+ *
+ * <p>
+ * The first pair is known as <em>measured width</em> and
+ * <em>measured height</em>. These dimensions define how big a view wants to be
+ * within its parent (see <a href="#Layout">Layout</a> for more details.) The
+ * measured dimensions can be obtained by calling {@link #getMeasuredWidth()}
+ * and {@link #getMeasuredHeight()}.
+ * </p>
+ *
+ * <p>
+ * The second pair is simply known as <em>width</em> and <em>height</em>, or
+ * sometimes <em>drawing width</em> and <em>drawing height</em>. These
+ * dimensions define the actual size of the view on screen, at drawing time and
+ * after layout. These values may, but do not have to, be different from the
+ * measured width and height. The width and height can be obtained by calling
+ * {@link #getWidth()} and {@link #getHeight()}.
+ * </p>
+ *
+ * <p>
+ * To measure its dimensions, a view takes into account its padding. The padding
+ * is expressed in pixels for the left, top, right and bottom parts of the view.
+ * Padding can be used to offset the content of the view by a specific amount of
+ * pixels. For instance, a left padding of 2 will push the view's content by
+ * 2 pixels to the right of the left edge. Padding can be set using the
+ * {@link #setPadding(int, int, int, int)} method and queried by calling
+ * {@link #getPaddingLeft()}, {@link #getPaddingTop()},
+ * {@link #getPaddingRight()} and {@link #getPaddingBottom()}.
+ * </p>
+ *
+ * <p>
+ * Even though a view can define a padding, it does not provide any support for
+ * margins. However, view groups provide such a support. Refer to
+ * {@link android.view.ViewGroup} and
+ * {@link android.view.ViewGroup.MarginLayoutParams} for further information.
+ * </p>
+ *
+ * <a name="Layout"></a>
+ * <h3>Layout</h3>
+ * <p>
+ * Layout is a two pass process: a measure pass and a layout pass. The measuring
+ * pass is implemented in {@link #measure(int, int)} and is a top-down traversal
+ * of the view tree. Each view pushes dimension specifications down the tree
+ * during the recursion. At the end of the measure pass, every view has stored
+ * its measurements. The second pass happens in
+ * {@link #layout(int,int,int,int)} and is also top-down. During
+ * this pass each parent is responsible for positioning all of its children
+ * using the sizes computed in the measure pass.
+ * </p>
+ *
+ * <p>
+ * When a view's measure() method returns, its {@link #getMeasuredWidth()} and
+ * {@link #getMeasuredHeight()} values must be set, along with those for all of
+ * that view's descendants. A view's measured width and measured height values
+ * must respect the constraints imposed by the view's parents. This guarantees
+ * that at the end of the measure pass, all parents accept all of their
+ * children's measurements. A parent view may call measure() more than once on
+ * its children. For example, the parent may measure each child once with
+ * unspecified dimensions to find out how big they want to be, then call
+ * measure() on them again with actual numbers if the sum of all the children's
+ * unconstrained sizes is too big or too small.
+ * </p>
+ *
+ * <p>
+ * The measure pass uses two classes to communicate dimensions. The
+ * {@link MeasureSpec} class is used by views to tell their parents how they
+ * want to be measured and positioned. The base LayoutParams class just
+ * describes how big the view wants to be for both width and height. For each
+ * dimension, it can specify one of:
+ * <ul>
+ * <li> an exact number
+ * <li>FILL_PARENT, which means the view wants to be as big as its parent
+ * (minus padding)
+ * <li> WRAP_CONTENT, which means that the view wants to be just big enough to
+ * enclose its content (plus padding).
+ * </ul>
+ * There are subclasses of LayoutParams for different subclasses of ViewGroup.
+ * For example, AbsoluteLayout has its own subclass of LayoutParams which adds
+ * an X and Y value.
+ * </p>
+ *
+ * <p>
+ * MeasureSpecs are used to push requirements down the tree from parent to
+ * child. A MeasureSpec can be in one of three modes:
+ * <ul>
+ * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension
+ * of a child view. For example, a LinearLayout may call measure() on its child
+ * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how
+ * tall the child view wants to be given a width of 240 pixels.
+ * <li>EXACTLY: This is used by the parent to impose an exact size on the
+ * child. The child must use this size, and guarantee that all of its
+ * descendants will fit within this size.
+ * <li>AT_MOST: This is used by the parent to impose a maximum size on the
+ * child. The child must gurantee that it and all of its descendants will fit
+ * within this size.
+ * </ul>
+ * </p>
+ *
+ * <p>
+ * To intiate a layout, call {@link #requestLayout}. This method is typically
+ * called by a view on itself when it believes that is can no longer fit within
+ * its current bounds.
+ * </p>
+ *
+ * <a name="Drawing"></a>
+ * <h3>Drawing</h3>
+ * <p>
+ * Drawing is handled by walking the tree and rendering each view that
+ * intersects the the invalid region. Because the tree is traversed in-order,
+ * this means that parents will draw before (i.e., behind) their children, with
+ * siblings drawn in the order they appear in the tree.
+ * If you set a background drawable for a View, then the View will draw it for you
+ * before calling back to its <code>onDraw()</code> method.
+ * </p>
+ *
+ * <p>
+ * Note that the framework will not draw views that are not in the invalid region.
+ * </p>
+ *
+ * <p>
+ * To force a view to draw, call {@link #invalidate()}.
+ * </p>
+ *
+ * <a name="EventHandlingThreading"></a>
+ * <h3>Event Handling and Threading</h3>
+ * <p>
+ * The basic cycle of a view is as follows:
+ * <ol>
+ * <li>An event comes in and is dispatched to the appropriate view. The view
+ * handles the event and notifies any listeners.</li>
+ * <li>If in the course of processing the event, the view's bounds may need
+ * to be changed, the view will call {@link #requestLayout()}.</li>
+ * <li>Similarly, if in the course of processing the event the view's appearance
+ * may need to be changed, the view will call {@link #invalidate()}.</li>
+ * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called,
+ * the framework will take care of measuring, laying out, and drawing the tree
+ * as appropriate.</li>
+ * </ol>
+ * </p>
+ *
+ * <p><em>Note: The entire view tree is single threaded. You must always be on
+ * the UI thread when calling any method on any view.</em>
+ * If you are doing work on other threads and want to update the state of a view
+ * from that thread, you should use a {@link Handler}.
+ * </p>
+ *
+ * <a name="FocusHandling"></a>
+ * <h3>Focus Handling</h3>
+ * <p>
+ * The framework will handle routine focus movement in response to user input.
+ * This includes changing the focus as views are removed or hidden, or as new
+ * views become available. Views indicate their willingness to take focus
+ * through the {@link #isFocusable} method. To change whether a view can take
+ * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below)
+ * views indicate whether they still would like focus via {@link #isFocusableInTouchMode}
+ * and can change this via {@link #setFocusableInTouchMode(boolean)}.
+ * </p>
+ * <p>
+ * Focus movement is based on an algorithm which finds the nearest neighbor in a
+ * given direction. In rare cases, the default algorithm may not match the
+ * intended behavior of the developer. In these situations, you can provide
+ * explicit overrides by using these XML attributes in the layout file:
+ * <pre>
+ * nextFocusDown
+ * nextFocusLeft
+ * nextFocusRight
+ * nextFocusUp
+ * </pre>
+ * </p>
+ *
+ *
+ * <p>
+ * To get a particular view to take focus, call {@link #requestFocus()}.
+ * </p>
+ *
+ * <a name="TouchMode"></a>
+ * <h3>Touch Mode</h3>
+ * <p>
+ * When a user is navigating a user interface via directional keys such as a D-pad, it is
+ * necessary to give focus to actionable items such as buttons so the user can see
+ * what will take input. If the device has touch capabilities, however, and the user
+ * begins interacting with the interface by touching it, it is no longer necessary to
+ * always highlight, or give focus to, a particular view. This motivates a mode
+ * for interaction named 'touch mode'.
+ * </p>
+ * <p>
+ * For a touch capable device, once the user touches the screen, the device
+ * will enter touch mode. From this point onward, only views for which
+ * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets.
+ * Other views that are touchable, like buttons, will not take focus when touched; they will
+ * only fire the on click listeners.
+ * </p>
+ * <p>
+ * Any time a user hits a directional key, such as a D-pad direction, the view device will
+ * exit touch mode, and find a view to take focus, so that the user may resume interacting
+ * with the user interface without touching the screen again.
+ * </p>
+ * <p>
+ * The touch mode state is maintained across {@link android.app.Activity}s. Call
+ * {@link #isInTouchMode} to see whether the device is currently in touch mode.
+ * </p>
+ *
+ * <a name="Scrolling"></a>
+ * <h3>Scrolling</h3>
+ * <p>
+ * The framework provides basic support for views that wish to internally
+ * scroll their content. This includes keeping track of the X and Y scroll
+ * offset as well as mechanisms for drawing scrollbars. See
+ * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)} for more details.
+ * </p>
+ *
+ * <a name="Tags"></a>
+ * <h3>Tags</h3>
+ * <p>
+ * Unlike IDs, tags are not used to identify views. Tags are essentially an
+ * extra piece of information that can be associated with a view. They are most
+ * often used as a convenience to store data related to views in the views
+ * themselves rather than by putting them in a separate structure.
+ * </p>
+ *
+ * <a name="Animation"></a>
+ * <h3>Animation</h3>
+ * <p>
+ * You can attach an {@link Animation} object to a view using
+ * {@link #setAnimation(Animation)} or
+ * {@link #startAnimation(Animation)}. The animation can alter the scale,
+ * rotation, translation and alpha of a view over time. If the animation is
+ * attached to a view that has children, the animation will affect the entire
+ * subtree rooted by that node. When an animation is started, the framework will
+ * take care of redrawing the appropriate views until the animation completes.
+ * </p>
+ *
+ * @attr ref android.R.styleable#View_fitsSystemWindows
+ * @attr ref android.R.styleable#View_nextFocusDown
+ * @attr ref android.R.styleable#View_nextFocusLeft
+ * @attr ref android.R.styleable#View_nextFocusRight
+ * @attr ref android.R.styleable#View_nextFocusUp
+ * @attr ref android.R.styleable#View_scrollX
+ * @attr ref android.R.styleable#View_scrollY
+ * @attr ref android.R.styleable#View_scrollbarTrackHorizontal
+ * @attr ref android.R.styleable#View_scrollbarThumbHorizontal
+ * @attr ref android.R.styleable#View_scrollbarSize
+ * @attr ref android.R.styleable#View_scrollbars
+ * @attr ref android.R.styleable#View_scrollbarThumbVertical
+ * @attr ref android.R.styleable#View_scrollbarTrackVertical
+ * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack
+ * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack
+ *
+ * @see android.view.ViewGroup
+ */
+public class View implements Drawable.Callback, KeyEvent.Callback {
+ private static final boolean DBG = false;
+
+ /**
+ * The logging tag used by this class with android.util.Log.
+ */
+ protected static final String VIEW_LOG_TAG = "View";
+
+ /**
+ * Used to mark a View that has no ID.
+ */
+ public static final int NO_ID = -1;
+
+ /**
+ * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when
+ * calling setFlags.
+ */
+ private static final int NOT_FOCUSABLE = 0x00000000;
+
+ /**
+ * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling
+ * setFlags.
+ */
+ private static final int FOCUSABLE = 0x00000001;
+
+ /**
+ * Mask for use with setFlags indicating bits used for focus.
+ */
+ private static final int FOCUSABLE_MASK = 0x00000001;
+
+ /**
+ * This view will adjust its padding to fit sytem windows (e.g. status bar)
+ */
+ private static final int FITS_SYSTEM_WINDOWS = 0x00000002;
+
+ /**
+ * This view is visible. Use with {@link #setVisibility}.
+ */
+ public static final int VISIBLE = 0x00000000;
+
+ /**
+ * This view is invisible, but it still takes up space for layout purposes.
+ * Use with {@link #setVisibility}.
+ */
+ public static final int INVISIBLE = 0x00000004;
+
+ /**
+ * This view is invisible, and it doesn't take any space for layout
+ * purposes. Use with {@link #setVisibility}.
+ */
+ public static final int GONE = 0x00000008;
+
+ /**
+ * Mask for use with setFlags indicating bits used for visibility.
+ * {@hide}
+ */
+ static final int VISIBILITY_MASK = 0x0000000C;
+
+ private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE};
+
+ /**
+ * This view is enabled. Intrepretation varies by subclass.
+ * Use with ENABLED_MASK when calling setFlags.
+ * {@hide}
+ */
+ static final int ENABLED = 0x00000000;
+
+ /**
+ * This view is disabled. Intrepretation varies by subclass.
+ * Use with ENABLED_MASK when calling setFlags.
+ * {@hide}
+ */
+ static final int DISABLED = 0x00000020;
+
+ /**
+ * Mask for use with setFlags indicating bits used for indicating whether
+ * this view is enabled
+ * {@hide}
+ */
+ static final int ENABLED_MASK = 0x00000020;
+
+ /**
+ * This view won't draw. {@link #onDraw} won't be called and further
+ * optimizations
+ * will be performed. It is okay to have this flag set and a background.
+ * Use with DRAW_MASK when calling setFlags.
+ * {@hide}
+ */
+ static final int WILL_NOT_DRAW = 0x00000080;
+
+ /**
+ * Mask for use with setFlags indicating bits used for indicating whether
+ * this view is will draw
+ * {@hide}
+ */
+ static final int DRAW_MASK = 0x00000080;
+
+ /**
+ * <p>This view doesn't show scrollbars.</p>
+ * {@hide}
+ */
+ static final int SCROLLBARS_NONE = 0x00000000;
+
+ /**
+ * <p>This view shows horizontal scrollbars.</p>
+ * {@hide}
+ */
+ static final int SCROLLBARS_HORIZONTAL = 0x00000100;
+
+ /**
+ * <p>This view shows vertical scrollbars.</p>
+ * {@hide}
+ */
+ static final int SCROLLBARS_VERTICAL = 0x00000200;
+
+ /**
+ * <p>Mask for use with setFlags indicating bits used for indicating which
+ * scrollbars are enabled.</p>
+ * {@hide}
+ */
+ static final int SCROLLBARS_MASK = 0x00000300;
+
+ // note 0x00000400 and 0x00000800 are now available for next flags...
+
+ /**
+ * <p>This view doesn't show fading edges.</p>
+ * {@hide}
+ */
+ static final int FADING_EDGE_NONE = 0x00000000;
+
+ /**
+ * <p>This view shows horizontal fading edges.</p>
+ * {@hide}
+ */
+ static final int FADING_EDGE_HORIZONTAL = 0x00001000;
+
+ /**
+ * <p>This view shows vertical fading edges.</p>
+ * {@hide}
+ */
+ static final int FADING_EDGE_VERTICAL = 0x00002000;
+
+ /**
+ * <p>Mask for use with setFlags indicating bits used for indicating which
+ * fading edges are enabled.</p>
+ * {@hide}
+ */
+ static final int FADING_EDGE_MASK = 0x00003000;
+
+ /**
+ * <p>Indicates this view can be clicked. When clickable, a View reacts
+ * to clicks by notifying the OnClickListener.<p>
+ * {@hide}
+ */
+ static final int CLICKABLE = 0x00004000;
+
+ /**
+ * <p>Indicates this view is caching its drawing into a bitmap.</p>
+ * {@hide}
+ */
+ static final int DRAWING_CACHE_ENABLED = 0x00008000;
+
+ /**
+ * <p>Indicates that no icicle should be saved for this view.<p>
+ * {@hide}
+ */
+ static final int SAVE_DISABLED = 0x000010000;
+
+ /**
+ * <p>Mask for use with setFlags indicating bits used for the saveEnabled
+ * property.</p>
+ * {@hide}
+ */
+ static final int SAVE_DISABLED_MASK = 0x000010000;
+
+ /**
+ * <p>Indicates that no drawing cache should ever be created for this view.<p>
+ * {@hide}
+ */
+ static final int WILL_NOT_CACHE_DRAWING = 0x000020000;
+
+ /**
+ * <p>Indicates this view can take / keep focus when int touch mode.</p>
+ * {@hide}
+ */
+ static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000;
+
+ /**
+ * <p>Enables low quality mode for the drawing cache.</p>
+ */
+ public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000;
+
+ /**
+ * <p>Enables high quality mode for the drawing cache.</p>
+ */
+ public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000;
+
+ /**
+ * <p>Enables automatic quality mode for the drawing cache.</p>
+ */
+ public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000;
+
+ private static final int[] DRAWING_CACHE_QUALITY_FLAGS = {
+ DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH
+ };
+
+ /**
+ * <p>Mask for use with setFlags indicating bits used for the cache
+ * quality property.</p>
+ * {@hide}
+ */
+ static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000;
+
+ /**
+ * <p>
+ * Indicates this view can be long clicked. When long clickable, a View
+ * reacts to long clicks by notifying the OnLongClickListener or showing a
+ * context menu.
+ * </p>
+ * {@hide}
+ */
+ static final int LONG_CLICKABLE = 0x00200000;
+
+ /**
+ * <p>Indicates that this view gets its drawable states from its direct parent
+ * and ignores its original internal states.</p>
+ *
+ * @hide
+ */
+ static final int DUPLICATE_PARENT_STATE = 0x00400000;
+
+ /**
+ * The scrollbar style to display the scrollbars inside the content area,
+ * without increasing the padding. The scrollbars will be overlaid with
+ * translucency on the view's content.
+ */
+ public static final int SCROLLBARS_INSIDE_OVERLAY = 0;
+
+ /**
+ * The scrollbar style to display the scrollbars inside the padded area,
+ * increasing the padding of the view. The scrollbars will not overlap the
+ * content area of the view.
+ */
+ public static final int SCROLLBARS_INSIDE_INSET = 0x01000000;
+
+ /**
+ * The scrollbar style to display the scrollbars at the edge of the view,
+ * without increasing the padding. The scrollbars will be overlaid with
+ * translucency.
+ */
+ public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000;
+
+ /**
+ * The scrollbar style to display the scrollbars at the edge of the view,
+ * increasing the padding of the view. The scrollbars will only overlap the
+ * background, if any.
+ */
+ public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000;
+
+ /**
+ * Mask to check if the scrollbar style is overlay or inset.
+ * {@hide}
+ */
+ static final int SCROLLBARS_INSET_MASK = 0x01000000;
+
+ /**
+ * Mask to check if the scrollbar style is inside or outside.
+ * {@hide}
+ */
+ static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000;
+
+ /**
+ * Mask for scrollbar style.
+ * {@hide}
+ */
+ static final int SCROLLBARS_STYLE_MASK = 0x03000000;
+
+ /**
+ * View flag indicating that the screen should remain on while the
+ * window containing this view is visible to the user. This effectively
+ * takes care of automatically setting the WindowManager's
+ * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}.
+ */
+ public static final int KEEP_SCREEN_ON = 0x04000000;
+
+ /**
+ * View flag indicating whether this view should have sound effects enabled
+ * for events such as clicking and touching.
+ */
+ public static final int SOUND_EFFECTS_ENABLED = 0x08000000;
+
+ /**
+ * View flag indicating whether this view should have haptic feedback
+ * enabled for events such as long presses.
+ */
+ public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000;
+
+ /**
+ * Use with {@link #focusSearch}. Move focus to the previous selectable
+ * item.
+ */
+ public static final int FOCUS_BACKWARD = 0x00000001;
+
+ /**
+ * Use with {@link #focusSearch}. Move focus to the next selectable
+ * item.
+ */
+ public static final int FOCUS_FORWARD = 0x00000002;
+
+ /**
+ * Use with {@link #focusSearch}. Move focus to the left.
+ */
+ public static final int FOCUS_LEFT = 0x00000011;
+
+ /**
+ * Use with {@link #focusSearch}. Move focus up.
+ */
+ public static final int FOCUS_UP = 0x00000021;
+
+ /**
+ * Use with {@link #focusSearch}. Move focus to the right.
+ */
+ public static final int FOCUS_RIGHT = 0x00000042;
+
+ /**
+ * Use with {@link #focusSearch}. Move focus down.
+ */
+ public static final int FOCUS_DOWN = 0x00000082;
+
+ /**
+ * Base View state sets
+ */
+ // Singles
+ /**
+ * Indicates the view has no states set. States are used with
+ * {@link android.graphics.drawable.Drawable} to change the drawing of the
+ * view depending on its state.
+ *
+ * @see android.graphics.drawable.Drawable
+ * @see #getDrawableState()
+ */
+ protected static final int[] EMPTY_STATE_SET = {};
+ /**
+ * Indicates the view is enabled. States are used with
+ * {@link android.graphics.drawable.Drawable} to change the drawing of the
+ * view depending on its state.
+ *
+ * @see android.graphics.drawable.Drawable
+ * @see #getDrawableState()
+ */
+ protected static final int[] ENABLED_STATE_SET = {R.attr.state_enabled};
+ /**
+ * Indicates the view is focused. States are used with
+ * {@link android.graphics.drawable.Drawable} to change the drawing of the
+ * view depending on its state.
+ *
+ * @see android.graphics.drawable.Drawable
+ * @see #getDrawableState()
+ */
+ protected static final int[] FOCUSED_STATE_SET = {R.attr.state_focused};
+ /**
+ * Indicates the view is selected. States are used with
+ * {@link android.graphics.drawable.Drawable} to change the drawing of the
+ * view depending on its state.
+ *
+ * @see android.graphics.drawable.Drawable
+ * @see #getDrawableState()
+ */
+ protected static final int[] SELECTED_STATE_SET = {R.attr.state_selected};
+ /**
+ * Indicates the view is pressed. States are used with
+ * {@link android.graphics.drawable.Drawable} to change the drawing of the
+ * view depending on its state.
+ *
+ * @see android.graphics.drawable.Drawable
+ * @see #getDrawableState()
+ * @hide
+ */
+ protected static final int[] PRESSED_STATE_SET = {R.attr.state_pressed};
+ /**
+ * Indicates the view's window has focus. States are used with
+ * {@link android.graphics.drawable.Drawable} to change the drawing of the
+ * view depending on its state.
+ *
+ * @see android.graphics.drawable.Drawable
+ * @see #getDrawableState()
+ */
+ protected static final int[] WINDOW_FOCUSED_STATE_SET =
+ {R.attr.state_window_focused};
+ // Doubles
+ /**
+ * Indicates the view is enabled and has the focus.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ */
+ protected static final int[] ENABLED_FOCUSED_STATE_SET =
+ stateSetUnion(ENABLED_STATE_SET, FOCUSED_STATE_SET);
+ /**
+ * Indicates the view is enabled and selected.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ */
+ protected static final int[] ENABLED_SELECTED_STATE_SET =
+ stateSetUnion(ENABLED_STATE_SET, SELECTED_STATE_SET);
+ /**
+ * Indicates the view is enabled and that its window has focus.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(ENABLED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+ /**
+ * Indicates the view is focused and selected.
+ *
+ * @see #FOCUSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ */
+ protected static final int[] FOCUSED_SELECTED_STATE_SET =
+ stateSetUnion(FOCUSED_STATE_SET, SELECTED_STATE_SET);
+ /**
+ * Indicates the view has the focus and that its window has the focus.
+ *
+ * @see #FOCUSED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+ /**
+ * Indicates the view is selected and that its window has the focus.
+ *
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+ // Triples
+ /**
+ * Indicates the view is enabled, focused and selected.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ */
+ protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET =
+ stateSetUnion(ENABLED_FOCUSED_STATE_SET, SELECTED_STATE_SET);
+ /**
+ * Indicates the view is enabled, focused and its window has the focus.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(ENABLED_FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+ /**
+ * Indicates the view is enabled, selected and its window has the focus.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(ENABLED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+ /**
+ * Indicates the view is focused, selected and its window has the focus.
+ *
+ * @see #FOCUSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(FOCUSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+ /**
+ * Indicates the view is enabled, focused, selected and its window
+ * has the focus.
+ *
+ * @see #ENABLED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(ENABLED_FOCUSED_SELECTED_STATE_SET,
+ WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed and its window has the focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed and selected.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ */
+ protected static final int[] PRESSED_SELECTED_STATE_SET =
+ stateSetUnion(PRESSED_STATE_SET, SELECTED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, selected and its window has the focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed and focused.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_STATE_SET, FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, focused and its window has the focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, focused and selected.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET =
+ stateSetUnion(PRESSED_FOCUSED_STATE_SET, SELECTED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, focused, selected and its window has the focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_FOCUSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed and enabled.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_STATE_SET =
+ stateSetUnion(PRESSED_STATE_SET, ENABLED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled and its window has the focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled and selected.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_STATE_SET, SELECTED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled, selected and its window has the
+ * focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled and focused.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_STATE_SET, FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled, focused and its window has the
+ * focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_FOCUSED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled, focused and selected.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_FOCUSED_STATE_SET, SELECTED_STATE_SET);
+
+ /**
+ * Indicates the view is pressed, enabled, focused, selected and its window
+ * has the focus.
+ *
+ * @see #PRESSED_STATE_SET
+ * @see #ENABLED_STATE_SET
+ * @see #SELECTED_STATE_SET
+ * @see #FOCUSED_STATE_SET
+ * @see #WINDOW_FOCUSED_STATE_SET
+ */
+ protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET =
+ stateSetUnion(PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET, WINDOW_FOCUSED_STATE_SET);
+
+ /**
+ * The order here is very important to {@link #getDrawableState()}
+ */
+ private static final int[][] VIEW_STATE_SETS = {
+ EMPTY_STATE_SET, // 0 0 0 0 0
+ WINDOW_FOCUSED_STATE_SET, // 0 0 0 0 1
+ SELECTED_STATE_SET, // 0 0 0 1 0
+ SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 0 0 1 1
+ FOCUSED_STATE_SET, // 0 0 1 0 0
+ FOCUSED_WINDOW_FOCUSED_STATE_SET, // 0 0 1 0 1
+ FOCUSED_SELECTED_STATE_SET, // 0 0 1 1 0
+ FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 0 1 1 1
+ ENABLED_STATE_SET, // 0 1 0 0 0
+ ENABLED_WINDOW_FOCUSED_STATE_SET, // 0 1 0 0 1
+ ENABLED_SELECTED_STATE_SET, // 0 1 0 1 0
+ ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 1 0 1 1
+ ENABLED_FOCUSED_STATE_SET, // 0 1 1 0 0
+ ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 0 1 1 0 1
+ ENABLED_FOCUSED_SELECTED_STATE_SET, // 0 1 1 1 0
+ ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 0 1 1 1 1
+ PRESSED_STATE_SET, // 1 0 0 0 0
+ PRESSED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 0 1
+ PRESSED_SELECTED_STATE_SET, // 1 0 0 1 0
+ PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 0 0 1 1
+ PRESSED_FOCUSED_STATE_SET, // 1 0 1 0 0
+ PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 1 0 1 0 1
+ PRESSED_FOCUSED_SELECTED_STATE_SET, // 1 0 1 1 0
+ PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 0 1 1 1
+ PRESSED_ENABLED_STATE_SET, // 1 1 0 0 0
+ PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET, // 1 1 0 0 1
+ PRESSED_ENABLED_SELECTED_STATE_SET, // 1 1 0 1 0
+ PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 1 0 1 1
+ PRESSED_ENABLED_FOCUSED_STATE_SET, // 1 1 1 0 0
+ PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET, // 1 1 1 0 1
+ PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET, // 1 1 1 1 0
+ PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET, // 1 1 1 1 1
+ };
+
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is showing the last item.
+ * @hide
+ */
+ protected static final int[] LAST_STATE_SET = {R.attr.state_last};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is showing the first item.
+ * @hide
+ */
+ protected static final int[] FIRST_STATE_SET = {R.attr.state_first};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is showing the middle item.
+ * @hide
+ */
+ protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is showing only one item.
+ * @hide
+ */
+ protected static final int[] SINGLE_STATE_SET = {R.attr.state_single};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is pressed and showing the last item.
+ * @hide
+ */
+ protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is pressed and showing the first item.
+ * @hide
+ */
+ protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is pressed and showing the middle item.
+ * @hide
+ */
+ protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed};
+ /**
+ * Used by views that contain lists of items. This state indicates that
+ * the view is pressed and showing only one item.
+ * @hide
+ */
+ protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed};
+
+ /**
+ * Temporary Rect currently for use in setBackground(). This will probably
+ * be extended in the future to hold our own class with more than just
+ * a Rect. :)
+ */
+ static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>();
+
+ /**
+ * The animation currently associated with this view.
+ * @hide
+ */
+ protected Animation mCurrentAnimation = null;
+
+ /**
+ * Width as measured during measure pass.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mMeasuredWidth;
+
+ /**
+ * Height as measured during measure pass.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mMeasuredHeight;
+
+ /**
+ * The view's identifier.
+ * {@hide}
+ *
+ * @see #setId(int)
+ * @see #getId()
+ */
+ @ViewDebug.ExportedProperty(resolveId = true)
+ int mID = NO_ID;
+
+ /**
+ * The view's tag.
+ * {@hide}
+ *
+ * @see #setTag(Object)
+ * @see #getTag()
+ */
+ protected Object mTag;
+
+ // for mPrivateFlags:
+ /** {@hide} */
+ static final int WANTS_FOCUS = 0x00000001;
+ /** {@hide} */
+ static final int FOCUSED = 0x00000002;
+ /** {@hide} */
+ static final int SELECTED = 0x00000004;
+ /** {@hide} */
+ static final int IS_ROOT_NAMESPACE = 0x00000008;
+ /** {@hide} */
+ static final int HAS_BOUNDS = 0x00000010;
+ /** {@hide} */
+ static final int DRAWN = 0x00000020;
+ /**
+ * When this flag is set, this view is running an animation on behalf of its
+ * children and should therefore not cancel invalidate requests, even if they
+ * lie outside of this view's bounds.
+ *
+ * {@hide}
+ */
+ static final int DRAW_ANIMATION = 0x00000040;
+ /** {@hide} */
+ static final int SKIP_DRAW = 0x00000080;
+ /** {@hide} */
+ static final int ONLY_DRAWS_BACKGROUND = 0x00000100;
+ /** {@hide} */
+ static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200;
+ /** {@hide} */
+ static final int DRAWABLE_STATE_DIRTY = 0x00000400;
+ /** {@hide} */
+ static final int MEASURED_DIMENSION_SET = 0x00000800;
+ /** {@hide} */
+ static final int FORCE_LAYOUT = 0x00001000;
+
+ private static final int LAYOUT_REQUIRED = 0x00002000;
+
+ private static final int PRESSED = 0x00004000;
+
+ /** {@hide} */
+ static final int DRAWING_CACHE_VALID = 0x00008000;
+ /**
+ * Flag used to indicate that this view should be drawn once more (and only once
+ * more) after its animation has completed.
+ * {@hide}
+ */
+ static final int ANIMATION_STARTED = 0x00010000;
+
+ private static final int SAVE_STATE_CALLED = 0x00020000;
+
+ /**
+ * Indicates that the View returned true when onSetAlpha() was called and that
+ * the alpha must be restored.
+ * {@hide}
+ */
+ static final int ALPHA_SET = 0x00040000;
+
+ /**
+ * Set by {@link #setScrollContainer(boolean)}.
+ */
+ static final int SCROLL_CONTAINER = 0x00080000;
+
+ /**
+ * Set by {@link #setScrollContainer(boolean)}.
+ */
+ static final int SCROLL_CONTAINER_ADDED = 0x00100000;
+
+ /**
+ * The parent this view is attached to.
+ * {@hide}
+ *
+ * @see #getParent()
+ */
+ protected ViewParent mParent;
+
+ /**
+ * {@hide}
+ */
+ AttachInfo mAttachInfo;
+
+ /**
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ int mPrivateFlags;
+
+ /**
+ * Count of how many windows this view has been attached to.
+ */
+ int mWindowAttachCount;
+
+ /**
+ * The layout parameters associated with this view and used by the parent
+ * {@link android.view.ViewGroup} to determine how this view should be
+ * laid out.
+ * {@hide}
+ */
+ protected ViewGroup.LayoutParams mLayoutParams;
+
+ /**
+ * The view flags hold various views states.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ int mViewFlags;
+
+ /**
+ * The distance in pixels from the left edge of this view's parent
+ * to the left edge of this view.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mLeft;
+ /**
+ * The distance in pixels from the left edge of this view's parent
+ * to the right edge of this view.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mRight;
+ /**
+ * The distance in pixels from the top edge of this view's parent
+ * to the top edge of this view.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mTop;
+ /**
+ * The distance in pixels from the top edge of this view's parent
+ * to the bottom edge of this view.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mBottom;
+
+ /**
+ * The offset, in pixels, by which the content of this view is scrolled
+ * horizontally.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mScrollX;
+ /**
+ * The offset, in pixels, by which the content of this view is scrolled
+ * vertically.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mScrollY;
+
+ /**
+ * The left padding in pixels, that is the distance in pixels between the
+ * left edge of this view and the left edge of its content.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mPaddingLeft;
+ /**
+ * The right padding in pixels, that is the distance in pixels between the
+ * right edge of this view and the right edge of its content.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mPaddingRight;
+ /**
+ * The top padding in pixels, that is the distance in pixels between the
+ * top edge of this view and the top edge of its content.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mPaddingTop;
+ /**
+ * The bottom padding in pixels, that is the distance in pixels between the
+ * bottom edge of this view and the bottom edge of its content.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty
+ protected int mPaddingBottom;
+
+ /**
+ * Cache the paddingRight set by the user to append to the scrollbar's size.
+ */
+ @ViewDebug.ExportedProperty
+ int mUserPaddingRight;
+
+ /**
+ * Cache the paddingBottom set by the user to append to the scrollbar's size.
+ */
+ @ViewDebug.ExportedProperty
+ int mUserPaddingBottom;
+
+ private int mOldWidthMeasureSpec = Integer.MIN_VALUE;
+ private int mOldHeightMeasureSpec = Integer.MIN_VALUE;
+
+ private Resources mResources = null;
+
+ private Drawable mBGDrawable;
+
+ private int mBackgroundResource;
+ private boolean mBackgroundSizeChanged;
+
+ /**
+ * Listener used to dispatch focus change events.
+ * This field should be made private, so it is hidden from the SDK.
+ * {@hide}
+ */
+ protected OnFocusChangeListener mOnFocusChangeListener;
+
+ /**
+ * Listener used to dispatch click events.
+ * This field should be made private, so it is hidden from the SDK.
+ * {@hide}
+ */
+ protected OnClickListener mOnClickListener;
+
+ /**
+ * Listener used to dispatch long click events.
+ * This field should be made private, so it is hidden from the SDK.
+ * {@hide}
+ */
+ protected OnLongClickListener mOnLongClickListener;
+
+ /**
+ * Listener used to build the context menu.
+ * This field should be made private, so it is hidden from the SDK.
+ * {@hide}
+ */
+ protected OnCreateContextMenuListener mOnCreateContextMenuListener;
+
+ private OnKeyListener mOnKeyListener;
+
+ private OnTouchListener mOnTouchListener;
+
+ /**
+ * The application environment this view lives in.
+ * This field should be made private, so it is hidden from the SDK.
+ * {@hide}
+ */
+ protected Context mContext;
+
+ private ScrollabilityCache mScrollCache;
+
+ private int[] mDrawableState = null;
+
+ private SoftReference<Bitmap> mDrawingCache;
+
+ /**
+ * When this view has focus and the next focus is {@link #FOCUS_LEFT},
+ * the user may specify which view to go to next.
+ */
+ private int mNextFocusLeftId = View.NO_ID;
+
+ /**
+ * When this view has focus and the next focus is {@link #FOCUS_RIGHT},
+ * the user may specify which view to go to next.
+ */
+ private int mNextFocusRightId = View.NO_ID;
+
+ /**
+ * When this view has focus and the next focus is {@link #FOCUS_UP},
+ * the user may specify which view to go to next.
+ */
+ private int mNextFocusUpId = View.NO_ID;
+
+ /**
+ * When this view has focus and the next focus is {@link #FOCUS_DOWN},
+ * the user may specify which view to go to next.
+ */
+ private int mNextFocusDownId = View.NO_ID;
+
+ private CheckForLongPress mPendingCheckForLongPress;
+ private UnsetPressedState mUnsetPressedState;
+
+ /**
+ * Whether the long press's action has been invoked. The tap's action is invoked on the
+ * up event while a long press is invoked as soon as the long press duration is reached, so
+ * a long press could be performed before the tap is checked, in which case the tap's action
+ * should not be invoked.
+ */
+ private boolean mHasPerformedLongPress;
+
+ /**
+ * The minimum height of the view. We'll try our best to have the height
+ * of this view to at least this amount.
+ */
+ @ViewDebug.ExportedProperty
+ private int mMinHeight;
+
+ /**
+ * The minimum width of the view. We'll try our best to have the width
+ * of this view to at least this amount.
+ */
+ @ViewDebug.ExportedProperty
+ private int mMinWidth;
+
+ /**
+ * The delegate to handle touch events that are physically in this view
+ * but should be handled by another view.
+ */
+ private TouchDelegate mTouchDelegate = null;
+
+ /**
+ * Solid color to use as a background when creating the drawing cache. Enables
+ * the cache to use 16 bit bitmaps instead of 32 bit.
+ */
+ private int mDrawingCacheBackgroundColor = 0;
+
+ /**
+ * Special tree observer used when mAttachInfo is null.
+ */
+ private ViewTreeObserver mFloatingTreeObserver;
+
+ // Used for debug only
+ static long sInstanceCount = 0;
+
+ /**
+ * Simple constructor to use when creating a view from code.
+ *
+ * @param context The Context the view is running in, through which it can
+ * access the current theme, resources, etc.
+ */
+ public View(Context context) {
+ mContext = context;
+ mResources = context != null ? context.getResources() : null;
+ mViewFlags = SOUND_EFFECTS_ENABLED|HAPTIC_FEEDBACK_ENABLED;
+ ++sInstanceCount;
+ }
+
+ /**
+ * Constructor that is called when inflating a view from XML. This is called
+ * when a view is being constructed from an XML file, supplying attributes
+ * that were specified in the XML file. This version uses a default style of
+ * 0, so the only attribute values applied are those in the Context's Theme
+ * and the given AttributeSet.
+ *
+ * <p>
+ * The method onFinishInflate() will be called after all children have been
+ * added.
+ *
+ * @param context The Context the view is running in, through which it can
+ * access the current theme, resources, etc.
+ * @param attrs The attributes of the XML tag that is inflating the view.
+ * @see #View(Context, AttributeSet, int)
+ */
+ public View(Context context, AttributeSet attrs) {
+ this(context, attrs, 0);
+ }
+
+ /**
+ * Perform inflation from XML and apply a class-specific base style. This
+ * constructor of View allows subclasses to use their own base style when
+ * they are inflating. For example, a Button class's constructor would call
+ * this version of the super class constructor and supply
+ * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows
+ * the theme's button style to modify all of the base view attributes (in
+ * particular its background) as well as the Button class's attributes.
+ *
+ * @param context The Context the view is running in, through which it can
+ * access the current theme, resources, etc.
+ * @param attrs The attributes of the XML tag that is inflating the view.
+ * @param defStyle The default style to apply to this view. If 0, no style
+ * will be applied (beyond what is included in the theme). This may
+ * either be an attribute resource, whose value will be retrieved
+ * from the current theme, or an explicit style resource.
+ * @see #View(Context, AttributeSet)
+ */
+ public View(Context context, AttributeSet attrs, int defStyle) {
+ this(context);
+
+ TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View,
+ defStyle, 0);
+
+ Drawable background = null;
+
+ int leftPadding = -1;
+ int topPadding = -1;
+ int rightPadding = -1;
+ int bottomPadding = -1;
+
+ int padding = -1;
+
+ int viewFlagValues = 0;
+ int viewFlagMasks = 0;
+
+ boolean setScrollContainer = false;
+
+ int x = 0;
+ int y = 0;
+
+ int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY;
+
+ final int N = a.getIndexCount();
+ for (int i = 0; i < N; i++) {
+ int attr = a.getIndex(i);
+ switch (attr) {
+ case com.android.internal.R.styleable.View_background:
+ background = a.getDrawable(attr);
+ break;
+ case com.android.internal.R.styleable.View_padding:
+ padding = a.getDimensionPixelSize(attr, -1);
+ break;
+ case com.android.internal.R.styleable.View_paddingLeft:
+ leftPadding = a.getDimensionPixelSize(attr, -1);
+ break;
+ case com.android.internal.R.styleable.View_paddingTop:
+ topPadding = a.getDimensionPixelSize(attr, -1);
+ break;
+ case com.android.internal.R.styleable.View_paddingRight:
+ rightPadding = a.getDimensionPixelSize(attr, -1);
+ break;
+ case com.android.internal.R.styleable.View_paddingBottom:
+ bottomPadding = a.getDimensionPixelSize(attr, -1);
+ break;
+ case com.android.internal.R.styleable.View_scrollX:
+ x = a.getDimensionPixelOffset(attr, 0);
+ break;
+ case com.android.internal.R.styleable.View_scrollY:
+ y = a.getDimensionPixelOffset(attr, 0);
+ break;
+ case com.android.internal.R.styleable.View_id:
+ mID = a.getResourceId(attr, NO_ID);
+ break;
+ case com.android.internal.R.styleable.View_tag:
+ mTag = a.getText(attr);
+ break;
+ case com.android.internal.R.styleable.View_fitsSystemWindows:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= FITS_SYSTEM_WINDOWS;
+ viewFlagMasks |= FITS_SYSTEM_WINDOWS;
+ }
+ break;
+ case com.android.internal.R.styleable.View_focusable:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= FOCUSABLE;
+ viewFlagMasks |= FOCUSABLE_MASK;
+ }
+ break;
+ case com.android.internal.R.styleable.View_focusableInTouchMode:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE;
+ viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK;
+ }
+ break;
+ case com.android.internal.R.styleable.View_clickable:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= CLICKABLE;
+ viewFlagMasks |= CLICKABLE;
+ }
+ break;
+ case com.android.internal.R.styleable.View_longClickable:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= LONG_CLICKABLE;
+ viewFlagMasks |= LONG_CLICKABLE;
+ }
+ break;
+ case com.android.internal.R.styleable.View_saveEnabled:
+ if (!a.getBoolean(attr, true)) {
+ viewFlagValues |= SAVE_DISABLED;
+ viewFlagMasks |= SAVE_DISABLED_MASK;
+ }
+ break;
+ case com.android.internal.R.styleable.View_duplicateParentState:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= DUPLICATE_PARENT_STATE;
+ viewFlagMasks |= DUPLICATE_PARENT_STATE;
+ }
+ break;
+ case com.android.internal.R.styleable.View_visibility:
+ final int visibility = a.getInt(attr, 0);
+ if (visibility != 0) {
+ viewFlagValues |= VISIBILITY_FLAGS[visibility];
+ viewFlagMasks |= VISIBILITY_MASK;
+ }
+ break;
+ case com.android.internal.R.styleable.View_drawingCacheQuality:
+ final int cacheQuality = a.getInt(attr, 0);
+ if (cacheQuality != 0) {
+ viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality];
+ viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK;
+ }
+ break;
+ case com.android.internal.R.styleable.View_soundEffectsEnabled:
+ if (!a.getBoolean(attr, true)) {
+ viewFlagValues &= ~SOUND_EFFECTS_ENABLED;
+ viewFlagMasks |= SOUND_EFFECTS_ENABLED;
+ }
+ case com.android.internal.R.styleable.View_hapticFeedbackEnabled:
+ if (!a.getBoolean(attr, true)) {
+ viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED;
+ viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED;
+ }
+ case R.styleable.View_scrollbars:
+ final int scrollbars = a.getInt(attr, SCROLLBARS_NONE);
+ if (scrollbars != SCROLLBARS_NONE) {
+ viewFlagValues |= scrollbars;
+ viewFlagMasks |= SCROLLBARS_MASK;
+ initializeScrollbars(a);
+ }
+ break;
+ case R.styleable.View_fadingEdge:
+ final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE);
+ if (fadingEdge != FADING_EDGE_NONE) {
+ viewFlagValues |= fadingEdge;
+ viewFlagMasks |= FADING_EDGE_MASK;
+ initializeFadingEdge(a);
+ }
+ break;
+ case R.styleable.View_scrollbarStyle:
+ scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY);
+ if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
+ viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK;
+ viewFlagMasks |= SCROLLBARS_STYLE_MASK;
+ }
+ break;
+ case R.styleable.View_isScrollContainer:
+ setScrollContainer = true;
+ if (a.getBoolean(attr, false)) {
+ setScrollContainer(true);
+ }
+ break;
+ case com.android.internal.R.styleable.View_keepScreenOn:
+ if (a.getBoolean(attr, false)) {
+ viewFlagValues |= KEEP_SCREEN_ON;
+ viewFlagMasks |= KEEP_SCREEN_ON;
+ }
+ break;
+ case R.styleable.View_nextFocusLeft:
+ mNextFocusLeftId = a.getResourceId(attr, View.NO_ID);
+ break;
+ case R.styleable.View_nextFocusRight:
+ mNextFocusRightId = a.getResourceId(attr, View.NO_ID);
+ break;
+ case R.styleable.View_nextFocusUp:
+ mNextFocusUpId = a.getResourceId(attr, View.NO_ID);
+ break;
+ case R.styleable.View_nextFocusDown:
+ mNextFocusDownId = a.getResourceId(attr, View.NO_ID);
+ break;
+ case R.styleable.View_minWidth:
+ mMinWidth = a.getDimensionPixelSize(attr, 0);
+ break;
+ case R.styleable.View_minHeight:
+ mMinHeight = a.getDimensionPixelSize(attr, 0);
+ break;
+ }
+ }
+
+ if (background != null) {
+ setBackgroundDrawable(background);
+ }
+
+ if (padding >= 0) {
+ leftPadding = padding;
+ topPadding = padding;
+ rightPadding = padding;
+ bottomPadding = padding;
+ }
+
+ // If the user specified the padding (either with android:padding or
+ // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise
+ // use the default padding or the padding from the background drawable
+ // (stored at this point in mPadding*)
+ setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft,
+ topPadding >= 0 ? topPadding : mPaddingTop,
+ rightPadding >= 0 ? rightPadding : mPaddingRight,
+ bottomPadding >= 0 ? bottomPadding : mPaddingBottom);
+
+ if (viewFlagMasks != 0) {
+ setFlags(viewFlagValues, viewFlagMasks);
+ }
+
+ // Needs to be called after mViewFlags is set
+ if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
+ recomputePadding();
+ }
+
+ if (x != 0 || y != 0) {
+ scrollTo(x, y);
+ }
+
+ if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) {
+ setScrollContainer(true);
+ }
+
+ a.recycle();
+ }
+
+ /**
+ * Non-public constructor for use in testing
+ */
+ View() {
+ }
+
+ @Override
+ protected void finalize() throws Throwable {
+ super.finalize();
+ --sInstanceCount;
+ }
+
+ /**
+ * <p>
+ * Initializes the fading edges from a given set of styled attributes. This
+ * method should be called by subclasses that need fading edges and when an
+ * instance of these subclasses is created programmatically rather than
+ * being inflated from XML. This method is automatically called when the XML
+ * is inflated.
+ * </p>
+ *
+ * @param a the styled attributes set to initialize the fading edges from
+ */
+ protected void initializeFadingEdge(TypedArray a) {
+ initScrollCache();
+
+ mScrollCache.fadingEdgeLength = a.getDimensionPixelSize(
+ R.styleable.View_fadingEdgeLength,
+ ViewConfiguration.get(mContext).getScaledFadingEdgeLength());
+ }
+
+ /**
+ * Returns the size of the vertical faded edges used to indicate that more
+ * content in this view is visible.
+ *
+ * @return The size in pixels of the vertical faded edge or 0 if vertical
+ * faded edges are not enabled for this view.
+ * @attr ref android.R.styleable#View_fadingEdgeLength
+ */
+ public int getVerticalFadingEdgeLength() {
+ if (isVerticalFadingEdgeEnabled()) {
+ ScrollabilityCache cache = mScrollCache;
+ if (cache != null) {
+ return cache.fadingEdgeLength;
+ }
+ }
+ return 0;
+ }
+
+ /**
+ * Set the size of the faded edge used to indicate that more content in this
+ * view is available. Will not change whether the fading edge is enabled; use
+ * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled}
+ * to enable the fading edge for the vertical or horizontal fading edges.
+ *
+ * @param length The size in pixels of the faded edge used to indicate that more
+ * content in this view is visible.
+ */
+ public void setFadingEdgeLength(int length) {
+ initScrollCache();
+ mScrollCache.fadingEdgeLength = length;
+ }
+
+ /**
+ * Returns the size of the horizontal faded edges used to indicate that more
+ * content in this view is visible.
+ *
+ * @return The size in pixels of the horizontal faded edge or 0 if horizontal
+ * faded edges are not enabled for this view.
+ * @attr ref android.R.styleable#View_fadingEdgeLength
+ */
+ public int getHorizontalFadingEdgeLength() {
+ if (isHorizontalFadingEdgeEnabled()) {
+ ScrollabilityCache cache = mScrollCache;
+ if (cache != null) {
+ return cache.fadingEdgeLength;
+ }
+ }
+ return 0;
+ }
+
+ /**
+ * Returns the width of the vertical scrollbar.
+ *
+ * @return The width in pixels of the vertical scrollbar or 0 if there
+ * is no vertical scrollbar.
+ */
+ public int getVerticalScrollbarWidth() {
+ ScrollabilityCache cache = mScrollCache;
+ if (cache != null) {
+ ScrollBarDrawable scrollBar = cache.scrollBar;
+ if (scrollBar != null) {
+ int size = scrollBar.getSize(true);
+ if (size <= 0) {
+ size = cache.scrollBarSize;
+ }
+ return size;
+ }
+ return 0;
+ }
+ return 0;
+ }
+
+ /**
+ * Returns the height of the horizontal scrollbar.
+ *
+ * @return The height in pixels of the horizontal scrollbar or 0 if
+ * there is no horizontal scrollbar.
+ */
+ protected int getHorizontalScrollbarHeight() {
+ ScrollabilityCache cache = mScrollCache;
+ if (cache != null) {
+ ScrollBarDrawable scrollBar = cache.scrollBar;
+ if (scrollBar != null) {
+ int size = scrollBar.getSize(false);
+ if (size <= 0) {
+ size = cache.scrollBarSize;
+ }
+ return size;
+ }
+ return 0;
+ }
+ return 0;
+ }
+
+ /**
+ * <p>
+ * Initializes the scrollbars from a given set of styled attributes. This
+ * method should be called by subclasses that need scrollbars and when an
+ * instance of these subclasses is created programmatically rather than
+ * being inflated from XML. This method is automatically called when the XML
+ * is inflated.
+ * </p>
+ *
+ * @param a the styled attributes set to initialize the scrollbars from
+ */
+ protected void initializeScrollbars(TypedArray a) {
+ initScrollCache();
+
+ if (mScrollCache.scrollBar == null) {
+ mScrollCache.scrollBar = new ScrollBarDrawable();
+ }
+
+ final ScrollabilityCache scrollabilityCache = mScrollCache;
+
+ scrollabilityCache.scrollBarSize = a.getDimensionPixelSize(
+ com.android.internal.R.styleable.View_scrollbarSize,
+ ViewConfiguration.get(mContext).getScaledScrollBarSize());
+
+ Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal);
+ scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track);
+
+ Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal);
+ if (thumb != null) {
+ scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb);
+ }
+
+ boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack,
+ false);
+ if (alwaysDraw) {
+ scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true);
+ }
+
+ track = a.getDrawable(R.styleable.View_scrollbarTrackVertical);
+ scrollabilityCache.scrollBar.setVerticalTrackDrawable(track);
+
+ thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical);
+ if (thumb != null) {
+ scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb);
+ }
+
+ alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack,
+ false);
+ if (alwaysDraw) {
+ scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true);
+ }
+
+ // Re-apply user/background padding so that scrollbar(s) get added
+ recomputePadding();
+ }
+
+ /**
+ * <p>
+ * Initalizes the scrollability cache if necessary.
+ * </p>
+ */
+ private void initScrollCache() {
+ if (mScrollCache == null) {
+ mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext));
+ }
+ }
+
+ /**
+ * Register a callback to be invoked when focus of this view changed.
+ *
+ * @param l The callback that will run.
+ */
+ public void setOnFocusChangeListener(OnFocusChangeListener l) {
+ mOnFocusChangeListener = l;
+ }
+
+ /**
+ * Returns the focus-change callback registered for this view.
+ *
+ * @return The callback, or null if one is not registered.
+ */
+ public OnFocusChangeListener getOnFocusChangeListener() {
+ return mOnFocusChangeListener;
+ }
+
+ /**
+ * Register a callback to be invoked when this view is clicked. If this view is not
+ * clickable, it becomes clickable.
+ *
+ * @param l The callback that will run
+ *
+ * @see #setClickable(boolean)
+ */
+ public void setOnClickListener(OnClickListener l) {
+ if (!isClickable()) {
+ setClickable(true);
+ }
+ mOnClickListener = l;
+ }
+
+ /**
+ * Register a callback to be invoked when this view is clicked and held. If this view is not
+ * long clickable, it becomes long clickable.
+ *
+ * @param l The callback that will run
+ *
+ * @see #setLongClickable(boolean)
+ */
+ public void setOnLongClickListener(OnLongClickListener l) {
+ if (!isLongClickable()) {
+ setLongClickable(true);
+ }
+ mOnLongClickListener = l;
+ }
+
+ /**
+ * Register a callback to be invoked when the context menu for this view is
+ * being built. If this view is not long clickable, it becomes long clickable.
+ *
+ * @param l The callback that will run
+ *
+ */
+ public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
+ if (!isLongClickable()) {
+ setLongClickable(true);
+ }
+ mOnCreateContextMenuListener = l;
+ }
+
+ /**
+ * Call this view's OnClickListener, if it is defined.
+ *
+ * @return True there was an assigned OnClickListener that was called, false
+ * otherwise is returned.
+ */
+ public boolean performClick() {
+ if (mOnClickListener != null) {
+ playSoundEffect(SoundEffectConstants.CLICK);
+ mOnClickListener.onClick(this);
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Call this view's OnLongClickListener, if it is defined. Invokes the context menu
+ * if the OnLongClickListener did not consume the event.
+ *
+ * @return True there was an assigned OnLongClickListener that was called, false
+ * otherwise is returned.
+ */
+ public boolean performLongClick() {
+ boolean handled = false;
+ if (mOnLongClickListener != null) {
+ handled = mOnLongClickListener.onLongClick(View.this);
+ }
+ if (!handled) {
+ handled = showContextMenu();
+ }
+ if (handled) {
+ performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+ }
+ return handled;
+ }
+
+ /**
+ * Bring up the context menu for this view.
+ *
+ * @return Whether a context menu was displayed.
+ */
+ public boolean showContextMenu() {
+ return getParent().showContextMenuForChild(this);
+ }
+
+ /**
+ * Register a callback to be invoked when a key is pressed in this view.
+ * @param l the key listener to attach to this view
+ */
+ public void setOnKeyListener(OnKeyListener l) {
+ mOnKeyListener = l;
+ }
+
+ /**
+ * Register a callback to be invoked when a touch event is sent to this view.
+ * @param l the touch listener to attach to this view
+ */
+ public void setOnTouchListener(OnTouchListener l) {
+ mOnTouchListener = l;
+ }
+
+ /**
+ * Give this view focus. This will cause {@link #onFocusChanged} to be called.
+ *
+ * Note: this does not check whether this {@link View} should get focus, it just
+ * gives it focus no matter what. It should only be called internally by framework
+ * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}.
+ *
+ * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN,
+ * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which
+ * focus moved when requestFocus() is called. It may not always
+ * apply, in which case use the default View.FOCUS_DOWN.
+ * @param previouslyFocusedRect The rectangle of the view that had focus
+ * prior in this View's coordinate system.
+ */
+ void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) {
+ if (DBG) {
+ System.out.println(this + " requestFocus()");
+ }
+
+ if ((mPrivateFlags & FOCUSED) == 0) {
+ mPrivateFlags |= FOCUSED;
+
+ if (mParent != null) {
+ mParent.requestChildFocus(this, this);
+ }
+
+ onFocusChanged(true, direction, previouslyFocusedRect);
+ refreshDrawableState();
+ }
+ }
+
+ /**
+ * Request that a rectangle of this view be visible on the screen,
+ * scrolling if necessary just enough.
+ *
+ * <p>A View should call this if it maintains some notion of which part
+ * of its content is interesting. For example, a text editing view
+ * should call this when its cursor moves.
+ *
+ * @param rectangle The rectangle.
+ * @return Whether any parent scrolled.
+ */
+ public boolean requestRectangleOnScreen(Rect rectangle) {
+ return requestRectangleOnScreen(rectangle, false);
+ }
+
+ /**
+ * Request that a rectangle of this view be visible on the screen,
+ * scrolling if necessary just enough.
+ *
+ * <p>A View should call this if it maintains some notion of which part
+ * of its content is interesting. For example, a text editing view
+ * should call this when its cursor moves.
+ *
+ * <p>When <code>immediate</code> is set to true, scrolling will not be
+ * animated.
+ *
+ * @param rectangle The rectangle.
+ * @param immediate True to forbid animated scrolling, false otherwise
+ * @return Whether any parent scrolled.
+ */
+ public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) {
+ View child = this;
+ ViewParent parent = mParent;
+ boolean scrolled = false;
+ while (parent != null) {
+ scrolled |= parent.requestChildRectangleOnScreen(child,
+ rectangle, immediate);
+
+ // offset rect so next call has the rectangle in the
+ // coordinate system of its direct child.
+ rectangle.offset(child.getLeft(), child.getTop());
+ rectangle.offset(-child.getScrollX(), -child.getScrollY());
+
+ if (!(parent instanceof View)) {
+ break;
+ }
+
+ child = (View) parent;
+ parent = child.getParent();
+ }
+ return scrolled;
+ }
+
+ /**
+ * Called when this view wants to give up focus. This will cause
+ * {@link #onFocusChanged} to be called.
+ */
+ public void clearFocus() {
+ if (DBG) {
+ System.out.println(this + " clearFocus()");
+ }
+
+ if ((mPrivateFlags & FOCUSED) != 0) {
+ mPrivateFlags &= ~FOCUSED;
+
+ if (mParent != null) {
+ mParent.clearChildFocus(this);
+ }
+
+ onFocusChanged(false, 0, null);
+ refreshDrawableState();
+ }
+ }
+
+ /**
+ * Called to clear the focus of a view that is about to be removed.
+ * Doesn't call clearChildFocus, which prevents this view from taking
+ * focus again before it has been removed from the parent
+ */
+ void clearFocusForRemoval() {
+ if ((mPrivateFlags & FOCUSED) != 0) {
+ mPrivateFlags &= ~FOCUSED;
+
+ onFocusChanged(false, 0, null);
+ refreshDrawableState();
+ }
+ }
+
+ /**
+ * Called internally by the view system when a new view is getting focus.
+ * This is what clears the old focus.
+ */
+ void unFocus() {
+ if (DBG) {
+ System.out.println(this + " unFocus()");
+ }
+
+ if ((mPrivateFlags & FOCUSED) != 0) {
+ mPrivateFlags &= ~FOCUSED;
+
+ onFocusChanged(false, 0, null);
+ refreshDrawableState();
+ }
+ }
+
+ /**
+ * Returns true if this view has focus iteself, or is the ancestor of the
+ * view that has focus.
+ *
+ * @return True if this view has or contains focus, false otherwise.
+ */
+ @ViewDebug.ExportedProperty
+ public boolean hasFocus() {
+ return (mPrivateFlags & FOCUSED) != 0;
+ }
+
+ /**
+ * Returns true if this view is focusable or if it contains a reachable View
+ * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()"
+ * is a View whose parents do not block descendants focus.
+ *
+ * Only {@link #VISIBLE} views are considered focusable.
+ *
+ * @return True if the view is focusable or if the view contains a focusable
+ * View, false otherwise.
+ *
+ * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS
+ */
+ public boolean hasFocusable() {
+ return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable();
+ }
+
+ /**
+ * Called by the view system when the focus state of this view changes.
+ * When the focus change event is caused by directional navigation, direction
+ * and previouslyFocusedRect provide insight into where the focus is coming from.
+ * When overriding, be sure to call up through to the super class so that
+ * the standard focus handling will occur.
+ *
+ * @param gainFocus True if the View has focus; false otherwise.
+ * @param direction The direction focus has moved when requestFocus()
+ * is called to give this view focus. Values are
+ * View.FOCUS_UP, View.FOCUS_DOWN, View.FOCUS_LEFT or
+ * View.FOCUS_RIGHT. It may not always apply, in which
+ * case use the default.
+ * @param previouslyFocusedRect The rectangle, in this view's coordinate
+ * system, of the previously focused view. If applicable, this will be
+ * passed in as finer grained information about where the focus is coming
+ * from (in addition to direction). Will be <code>null</code> otherwise.
+ */
+ protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
+ InputMethodManager imm = InputMethodManager.peekInstance();
+ if (!gainFocus) {
+ if (isPressed()) {
+ setPressed(false);
+ }
+ if (imm != null && mAttachInfo != null
+ && mAttachInfo.mHasWindowFocus) {
+ imm.focusOut(this);
+ }
+ } else if (imm != null && mAttachInfo != null
+ && mAttachInfo.mHasWindowFocus) {
+ imm.focusIn(this);
+ }
+
+ invalidate();
+ if (mOnFocusChangeListener != null) {
+ mOnFocusChangeListener.onFocusChange(this, gainFocus);
+ }
+ }
+
+ /**
+ * Returns true if this view has focus
+ *
+ * @return True if this view has focus, false otherwise.
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isFocused() {
+ return (mPrivateFlags & FOCUSED) != 0;
+ }
+
+ /**
+ * Find the view in the hierarchy rooted at this view that currently has
+ * focus.
+ *
+ * @return The view that currently has focus, or null if no focused view can
+ * be found.
+ */
+ public View findFocus() {
+ return (mPrivateFlags & FOCUSED) != 0 ? this : null;
+ }
+
+ /**
+ * Change whether this view is one of the set of scrollable containers in
+ * its window. This will be used to determine whether the window can
+ * resize or must pan when a soft input area is open -- scrollable
+ * containers allow the window to use resize mode since the container
+ * will appropriately shrink.
+ */
+ public void setScrollContainer(boolean isScrollContainer) {
+ if (isScrollContainer) {
+ if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) {
+ mAttachInfo.mScrollContainers.add(this);
+ mPrivateFlags |= SCROLL_CONTAINER_ADDED;
+ }
+ mPrivateFlags |= SCROLL_CONTAINER;
+ } else {
+ if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) {
+ mAttachInfo.mScrollContainers.remove(this);
+ }
+ mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED);
+ }
+ }
+
+ /**
+ * Returns the quality of the drawing cache.
+ *
+ * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO},
+ * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
+ *
+ * @see #setDrawingCacheQuality(int)
+ * @see #setDrawingCacheEnabled(boolean)
+ * @see #isDrawingCacheEnabled()
+ *
+ * @attr ref android.R.styleable#View_drawingCacheQuality
+ */
+ public int getDrawingCacheQuality() {
+ return mViewFlags & DRAWING_CACHE_QUALITY_MASK;
+ }
+
+ /**
+ * Set the drawing cache quality of this view. This value is used only when the
+ * drawing cache is enabled
+ *
+ * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO},
+ * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
+ *
+ * @see #getDrawingCacheQuality()
+ * @see #setDrawingCacheEnabled(boolean)
+ * @see #isDrawingCacheEnabled()
+ *
+ * @attr ref android.R.styleable#View_drawingCacheQuality
+ */
+ public void setDrawingCacheQuality(int quality) {
+ setFlags(quality, DRAWING_CACHE_QUALITY_MASK);
+ }
+
+ /**
+ * Returns whether the screen should remain on, corresponding to the current
+ * value of {@link #KEEP_SCREEN_ON}.
+ *
+ * @return Returns true if {@link #KEEP_SCREEN_ON} is set.
+ *
+ * @see #setKeepScreenOn(boolean)
+ *
+ * @attr ref android.R.styleable#View_keepScreenOn
+ */
+ public boolean getKeepScreenOn() {
+ return (mViewFlags & KEEP_SCREEN_ON) != 0;
+ }
+
+ /**
+ * Controls whether the screen should remain on, modifying the
+ * value of {@link #KEEP_SCREEN_ON}.
+ *
+ * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}.
+ *
+ * @see #getKeepScreenOn()
+ *
+ * @attr ref android.R.styleable#View_keepScreenOn
+ */
+ public void setKeepScreenOn(boolean keepScreenOn) {
+ setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON);
+ }
+
+ /**
+ * @return The user specified next focus ID.
+ *
+ * @attr ref android.R.styleable#View_nextFocusLeft
+ */
+ public int getNextFocusLeftId() {
+ return mNextFocusLeftId;
+ }
+
+ /**
+ * Set the id of the view to use for the next focus
+ *
+ * @param nextFocusLeftId
+ *
+ * @attr ref android.R.styleable#View_nextFocusLeft
+ */
+ public void setNextFocusLeftId(int nextFocusLeftId) {
+ mNextFocusLeftId = nextFocusLeftId;
+ }
+
+ /**
+ * @return The user specified next focus ID.
+ *
+ * @attr ref android.R.styleable#View_nextFocusRight
+ */
+ public int getNextFocusRightId() {
+ return mNextFocusRightId;
+ }
+
+ /**
+ * Set the id of the view to use for the next focus
+ *
+ * @param nextFocusRightId
+ *
+ * @attr ref android.R.styleable#View_nextFocusRight
+ */
+ public void setNextFocusRightId(int nextFocusRightId) {
+ mNextFocusRightId = nextFocusRightId;
+ }
+
+ /**
+ * @return The user specified next focus ID.
+ *
+ * @attr ref android.R.styleable#View_nextFocusUp
+ */
+ public int getNextFocusUpId() {
+ return mNextFocusUpId;
+ }
+
+ /**
+ * Set the id of the view to use for the next focus
+ *
+ * @param nextFocusUpId
+ *
+ * @attr ref android.R.styleable#View_nextFocusUp
+ */
+ public void setNextFocusUpId(int nextFocusUpId) {
+ mNextFocusUpId = nextFocusUpId;
+ }
+
+ /**
+ * @return The user specified next focus ID.
+ *
+ * @attr ref android.R.styleable#View_nextFocusDown
+ */
+ public int getNextFocusDownId() {
+ return mNextFocusDownId;
+ }
+
+ /**
+ * Set the id of the view to use for the next focus
+ *
+ * @param nextFocusDownId
+ *
+ * @attr ref android.R.styleable#View_nextFocusDown
+ */
+ public void setNextFocusDownId(int nextFocusDownId) {
+ mNextFocusDownId = nextFocusDownId;
+ }
+
+ /**
+ * Returns the visibility of this view and all of its ancestors
+ *
+ * @return True if this view and all of its ancestors are {@link #VISIBLE}
+ */
+ public boolean isShown() {
+ View current = this;
+ //noinspection ConstantConditions
+ do {
+ if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) {
+ return false;
+ }
+ ViewParent parent = current.mParent;
+ if (parent == null) {
+ return false; // We are not attached to the view root
+ }
+ if (!(parent instanceof View)) {
+ return true;
+ }
+ current = (View) parent;
+ } while (current != null);
+
+ return false;
+ }
+
+ /**
+ * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag
+ * is set
+ *
+ * @param insets Insets for system windows
+ *
+ * @return True if this view applied the insets, false otherwise
+ */
+ protected boolean fitSystemWindows(Rect insets) {
+ if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) {
+ mPaddingLeft = insets.left;
+ mPaddingTop = insets.top;
+ mPaddingRight = insets.right;
+ mPaddingBottom = insets.bottom;
+ requestLayout();
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Returns the visibility status for this view.
+ *
+ * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
+ * @attr ref android.R.styleable#View_visibility
+ */
+ @ViewDebug.ExportedProperty(mapping = {
+ @ViewDebug.IntToString(from = 0, to = "VISIBLE"),
+ @ViewDebug.IntToString(from = 4, to = "INVISIBLE"),
+ @ViewDebug.IntToString(from = 8, to = "GONE")
+ })
+ public int getVisibility() {
+ return mViewFlags & VISIBILITY_MASK;
+ }
+
+ /**
+ * Set the enabled state of this view.
+ *
+ * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
+ * @attr ref android.R.styleable#View_visibility
+ */
+ @RemotableViewMethod
+ public void setVisibility(int visibility) {
+ setFlags(visibility, VISIBILITY_MASK);
+ if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false);
+ }
+
+ /**
+ * Returns the enabled status for this view. The interpretation of the
+ * enabled state varies by subclass.
+ *
+ * @return True if this view is enabled, false otherwise.
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isEnabled() {
+ return (mViewFlags & ENABLED_MASK) == ENABLED;
+ }
+
+ /**
+ * Set the enabled state of this view. The interpretation of the enabled
+ * state varies by subclass.
+ *
+ * @param enabled True if this view is enabled, false otherwise.
+ */
+ public void setEnabled(boolean enabled) {
+ setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK);
+
+ /*
+ * The View most likely has to change its appearance, so refresh
+ * the drawable state.
+ */
+ refreshDrawableState();
+
+ // Invalidate too, since the default behavior for views is to be
+ // be drawn at 50% alpha rather than to change the drawable.
+ invalidate();
+ }
+
+ /**
+ * Set whether this view can receive the focus.
+ *
+ * Setting this to false will also ensure that this view is not focusable
+ * in touch mode.
+ *
+ * @param focusable If true, this view can receive the focus.
+ *
+ * @see #setFocusableInTouchMode(boolean)
+ * @attr ref android.R.styleable#View_focusable
+ */
+ public void setFocusable(boolean focusable) {
+ if (!focusable) {
+ setFlags(0, FOCUSABLE_IN_TOUCH_MODE);
+ }
+ setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK);
+ }
+
+ /**
+ * Set whether this view can receive focus while in touch mode.
+ *
+ * Setting this to true will also ensure that this view is focusable.
+ *
+ * @param focusableInTouchMode If true, this view can receive the focus while
+ * in touch mode.
+ *
+ * @see #setFocusable(boolean)
+ * @attr ref android.R.styleable#View_focusableInTouchMode
+ */
+ public void setFocusableInTouchMode(boolean focusableInTouchMode) {
+ // Focusable in touch mode should always be set before the focusable flag
+ // otherwise, setting the focusable flag will trigger a focusableViewAvailable()
+ // which, in touch mode, will not successfully request focus on this view
+ // because the focusable in touch mode flag is not set
+ setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE);
+ if (focusableInTouchMode) {
+ setFlags(FOCUSABLE, FOCUSABLE_MASK);
+ }
+ }
+
+ /**
+ * Set whether this view should have sound effects enabled for events such as
+ * clicking and touching.
+ *
+ * <p>You may wish to disable sound effects for a view if you already play sounds,
+ * for instance, a dial key that plays dtmf tones.
+ *
+ * @param soundEffectsEnabled whether sound effects are enabled for this view.
+ * @see #isSoundEffectsEnabled()
+ * @see #playSoundEffect(int)
+ * @attr ref android.R.styleable#View_soundEffectsEnabled
+ */
+ public void setSoundEffectsEnabled(boolean soundEffectsEnabled) {
+ setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED);
+ }
+
+ /**
+ * @return whether this view should have sound effects enabled for events such as
+ * clicking and touching.
+ *
+ * @see #setSoundEffectsEnabled(boolean)
+ * @see #playSoundEffect(int)
+ * @attr ref android.R.styleable#View_soundEffectsEnabled
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isSoundEffectsEnabled() {
+ return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED);
+ }
+
+ /**
+ * Set whether this view should have haptic feedback for events such as
+ * long presses.
+ *
+ * <p>You may wish to disable haptic feedback if your view already controls
+ * its own haptic feedback.
+ *
+ * @param hapticFeedbackEnabled whether haptic feedback enabled for this view.
+ * @see #isHapticFeedbackEnabled()
+ * @see #performHapticFeedback(int)
+ * @attr ref android.R.styleable#View_hapticFeedbackEnabled
+ */
+ public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) {
+ setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED);
+ }
+
+ /**
+ * @return whether this view should have haptic feedback enabled for events
+ * long presses.
+ *
+ * @see #setHapticFeedbackEnabled(boolean)
+ * @see #performHapticFeedback(int)
+ * @attr ref android.R.styleable#View_hapticFeedbackEnabled
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isHapticFeedbackEnabled() {
+ return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED);
+ }
+
+ /**
+ * If this view doesn't do any drawing on its own, set this flag to
+ * allow further optimizations. By default, this flag is not set on
+ * View, but could be set on some View subclasses such as ViewGroup.
+ *
+ * Typically, if you override {@link #onDraw} you should clear this flag.
+ *
+ * @param willNotDraw whether or not this View draw on its own
+ */
+ public void setWillNotDraw(boolean willNotDraw) {
+ setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK);
+ }
+
+ /**
+ * Returns whether or not this View draws on its own.
+ *
+ * @return true if this view has nothing to draw, false otherwise
+ */
+ @ViewDebug.ExportedProperty
+ public boolean willNotDraw() {
+ return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW;
+ }
+
+ /**
+ * When a View's drawing cache is enabled, drawing is redirected to an
+ * offscreen bitmap. Some views, like an ImageView, must be able to
+ * bypass this mechanism if they already draw a single bitmap, to avoid
+ * unnecessary usage of the memory.
+ *
+ * @param willNotCacheDrawing true if this view does not cache its
+ * drawing, false otherwise
+ */
+ public void setWillNotCacheDrawing(boolean willNotCacheDrawing) {
+ setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING);
+ }
+
+ /**
+ * Returns whether or not this View can cache its drawing or not.
+ *
+ * @return true if this view does not cache its drawing, false otherwise
+ */
+ @ViewDebug.ExportedProperty
+ public boolean willNotCacheDrawing() {
+ return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING;
+ }
+
+ /**
+ * Indicates whether this view reacts to click events or not.
+ *
+ * @return true if the view is clickable, false otherwise
+ *
+ * @see #setClickable(boolean)
+ * @attr ref android.R.styleable#View_clickable
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isClickable() {
+ return (mViewFlags & CLICKABLE) == CLICKABLE;
+ }
+
+ /**
+ * Enables or disables click events for this view. When a view
+ * is clickable it will change its state to "pressed" on every click.
+ * Subclasses should set the view clickable to visually react to
+ * user's clicks.
+ *
+ * @param clickable true to make the view clickable, false otherwise
+ *
+ * @see #isClickable()
+ * @attr ref android.R.styleable#View_clickable
+ */
+ public void setClickable(boolean clickable) {
+ setFlags(clickable ? CLICKABLE : 0, CLICKABLE);
+ }
+
+ /**
+ * Indicates whether this view reacts to long click events or not.
+ *
+ * @return true if the view is long clickable, false otherwise
+ *
+ * @see #setLongClickable(boolean)
+ * @attr ref android.R.styleable#View_longClickable
+ */
+ public boolean isLongClickable() {
+ return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
+ }
+
+ /**
+ * Enables or disables long click events for this view. When a view is long
+ * clickable it reacts to the user holding down the button for a longer
+ * duration than a tap. This event can either launch the listener or a
+ * context menu.
+ *
+ * @param longClickable true to make the view long clickable, false otherwise
+ * @see #isLongClickable()
+ * @attr ref android.R.styleable#View_longClickable
+ */
+ public void setLongClickable(boolean longClickable) {
+ setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE);
+ }
+
+ /**
+ * Sets the pressed that for this view.
+ *
+ * @see #isClickable()
+ * @see #setClickable(boolean)
+ *
+ * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts
+ * the View's internal state from a previously set "pressed" state.
+ */
+ public void setPressed(boolean pressed) {
+ if (pressed) {
+ mPrivateFlags |= PRESSED;
+ } else {
+ mPrivateFlags &= ~PRESSED;
+ }
+ refreshDrawableState();
+ dispatchSetPressed(pressed);
+ }
+
+ /**
+ * Dispatch setPressed to all of this View's children.
+ *
+ * @see #setPressed(boolean)
+ *
+ * @param pressed The new pressed state
+ */
+ protected void dispatchSetPressed(boolean pressed) {
+ }
+
+ /**
+ * Indicates whether the view is currently in pressed state. Unless
+ * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter
+ * the pressed state.
+ *
+ * @see #setPressed
+ * @see #isClickable()
+ * @see #setClickable(boolean)
+ *
+ * @return true if the view is currently pressed, false otherwise
+ */
+ public boolean isPressed() {
+ return (mPrivateFlags & PRESSED) == PRESSED;
+ }
+
+ /**
+ * Indicates whether this view will save its state (that is,
+ * whether its {@link #onSaveInstanceState} method will be called).
+ *
+ * @return Returns true if the view state saving is enabled, else false.
+ *
+ * @see #setSaveEnabled(boolean)
+ * @attr ref android.R.styleable#View_saveEnabled
+ */
+ public boolean isSaveEnabled() {
+ return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED;
+ }
+
+ /**
+ * Controls whether the saving of this view's state is
+ * enabled (that is, whether its {@link #onSaveInstanceState} method
+ * will be called). Note that even if freezing is enabled, the
+ * view still must have an id assigned to it (via {@link #setId setId()})
+ * for its state to be saved. This flag can only disable the
+ * saving of this view; any child views may still have their state saved.
+ *
+ * @param enabled Set to false to <em>disable</em> state saving, or true
+ * (the default) to allow it.
+ *
+ * @see #isSaveEnabled()
+ * @see #setId(int)
+ * @see #onSaveInstanceState()
+ * @attr ref android.R.styleable#View_saveEnabled
+ */
+ public void setSaveEnabled(boolean enabled) {
+ setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK);
+ }
+
+
+ /**
+ * Returns whether this View is able to take focus.
+ *
+ * @return True if this view can take focus, or false otherwise.
+ * @attr ref android.R.styleable#View_focusable
+ */
+ @ViewDebug.ExportedProperty
+ public final boolean isFocusable() {
+ return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK);
+ }
+
+ /**
+ * When a view is focusable, it may not want to take focus when in touch mode.
+ * For example, a button would like focus when the user is navigating via a D-pad
+ * so that the user can click on it, but once the user starts touching the screen,
+ * the button shouldn't take focus
+ * @return Whether the view is focusable in touch mode.
+ * @attr ref android.R.styleable#View_focusableInTouchMode
+ */
+ @ViewDebug.ExportedProperty
+ public final boolean isFocusableInTouchMode() {
+ return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE);
+ }
+
+ /**
+ * Find the nearest view in the specified direction that can take focus.
+ * This does not actually give focus to that view.
+ *
+ * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
+ *
+ * @return The nearest focusable in the specified direction, or null if none
+ * can be found.
+ */
+ public View focusSearch(int direction) {
+ if (mParent != null) {
+ return mParent.focusSearch(this, direction);
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * This method is the last chance for the focused view and its ancestors to
+ * respond to an arrow key. This is called when the focused view did not
+ * consume the key internally, nor could the view system find a new view in
+ * the requested direction to give focus to.
+ *
+ * @param focused The currently focused view.
+ * @param direction The direction focus wants to move. One of FOCUS_UP,
+ * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT.
+ * @return True if the this view consumed this unhandled move.
+ */
+ public boolean dispatchUnhandledMove(View focused, int direction) {
+ return false;
+ }
+
+ /**
+ * If a user manually specified the next view id for a particular direction,
+ * use the root to look up the view. Once a view is found, it is cached
+ * for future lookups.
+ * @param root The root view of the hierarchy containing this view.
+ * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
+ * @return The user specified next view, or null if there is none.
+ */
+ View findUserSetNextFocus(View root, int direction) {
+ switch (direction) {
+ case FOCUS_LEFT:
+ if (mNextFocusLeftId == View.NO_ID) return null;
+ return findViewShouldExist(root, mNextFocusLeftId);
+ case FOCUS_RIGHT:
+ if (mNextFocusRightId == View.NO_ID) return null;
+ return findViewShouldExist(root, mNextFocusRightId);
+ case FOCUS_UP:
+ if (mNextFocusUpId == View.NO_ID) return null;
+ return findViewShouldExist(root, mNextFocusUpId);
+ case FOCUS_DOWN:
+ if (mNextFocusDownId == View.NO_ID) return null;
+ return findViewShouldExist(root, mNextFocusDownId);
+ }
+ return null;
+ }
+
+ private static View findViewShouldExist(View root, int childViewId) {
+ View result = root.findViewById(childViewId);
+ if (result == null) {
+ Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified "
+ + "by user for id " + childViewId);
+ }
+ return result;
+ }
+
+ /**
+ * Find and return all focusable views that are descendants of this view,
+ * possibly including this view if it is focusable itself.
+ *
+ * @param direction The direction of the focus
+ * @return A list of focusable views
+ */
+ public ArrayList<View> getFocusables(int direction) {
+ ArrayList<View> result = new ArrayList<View>(24);
+ addFocusables(result, direction);
+ return result;
+ }
+
+ /**
+ * Add any focusable views that are descendants of this view (possibly
+ * including this view if it is focusable itself) to views. If we are in touch mode,
+ * only add views that are also focusable in touch mode.
+ *
+ * @param views Focusable views found so far
+ * @param direction The direction of the focus
+ */
+ public void addFocusables(ArrayList<View> views, int direction) {
+ if (!isFocusable()) return;
+
+ if (isInTouchMode() && !isFocusableInTouchMode()) return;
+
+ views.add(this);
+ }
+
+ /**
+ * Find and return all touchable views that are descendants of this view,
+ * possibly including this view if it is touchable itself.
+ *
+ * @return A list of touchable views
+ */
+ public ArrayList<View> getTouchables() {
+ ArrayList<View> result = new ArrayList<View>();
+ addTouchables(result);
+ return result;
+ }
+
+ /**
+ * Add any touchable views that are descendants of this view (possibly
+ * including this view if it is touchable itself) to views.
+ *
+ * @param views Touchable views found so far
+ */
+ public void addTouchables(ArrayList<View> views) {
+ final int viewFlags = mViewFlags;
+
+ if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
+ && (viewFlags & ENABLED_MASK) == ENABLED) {
+ views.add(this);
+ }
+ }
+
+ /**
+ * Call this to try to give focus to a specific view or to one of its
+ * descendants.
+ *
+ * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false),
+ * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode})
+ * while the device is in touch mode.
+ *
+ * See also {@link #focusSearch}, which is what you call to say that you
+ * have focus, and you want your parent to look for the next one.
+ *
+ * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments
+ * {@link #FOCUS_DOWN} and <code>null</code>.
+ *
+ * @return Whether this view or one of its descendants actually took focus.
+ */
+ public final boolean requestFocus() {
+ return requestFocus(View.FOCUS_DOWN);
+ }
+
+
+ /**
+ * Call this to try to give focus to a specific view or to one of its
+ * descendants and give it a hint about what direction focus is heading.
+ *
+ * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false),
+ * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode})
+ * while the device is in touch mode.
+ *
+ * See also {@link #focusSearch}, which is what you call to say that you
+ * have focus, and you want your parent to look for the next one.
+ *
+ * This is equivalent to calling {@link #requestFocus(int, Rect)} with
+ * <code>null</code> set for the previously focused rectangle.
+ *
+ * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
+ * @return Whether this view or one of its descendants actually took focus.
+ */
+ public final boolean requestFocus(int direction) {
+ return requestFocus(direction, null);
+ }
+
+ /**
+ * Call this to try to give focus to a specific view or to one of its descendants
+ * and give it hints about the direction and a specific rectangle that the focus
+ * is coming from. The rectangle can help give larger views a finer grained hint
+ * about where focus is coming from, and therefore, where to show selection, or
+ * forward focus change internally.
+ *
+ * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false),
+ * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode})
+ * while the device is in touch mode.
+ *
+ * A View will not take focus if it is not visible.
+ *
+ * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()}
+ * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}.
+ *
+ * See also {@link #focusSearch}, which is what you call to say that you
+ * have focus, and you want your parent to look for the next one.
+ *
+ * You may wish to override this method if your custom {@link View} has an internal
+ * {@link View} that it wishes to forward the request to.
+ *
+ * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
+ * @param previouslyFocusedRect The rectangle (in this View's coordinate system)
+ * to give a finer grained hint about where focus is coming from. May be null
+ * if there is no hint.
+ * @return Whether this view or one of its descendants actually took focus.
+ */
+ public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
+ // need to be focusable
+ if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE ||
+ (mViewFlags & VISIBILITY_MASK) != VISIBLE) {
+ return false;
+ }
+
+ // need to be focusable in touch mode if in touch mode
+ if (isInTouchMode() &&
+ (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) {
+ return false;
+ }
+
+ // need to not have any parents blocking us
+ if (hasAncestorThatBlocksDescendantFocus()) {
+ return false;
+ }
+
+ handleFocusGainInternal(direction, previouslyFocusedRect);
+ return true;
+ }
+
+ /**
+ * Call this to try to give focus to a specific view or to one of its descendants. This is a
+ * special variant of {@link #requestFocus() } that will allow views that are not focuable in
+ * touch mode to request focus when they are touched.
+ *
+ * @return Whether this view or one of its descendants actually took focus.
+ *
+ * @see #isInTouchMode()
+ *
+ */
+ public final boolean requestFocusFromTouch() {
+ // Leave touch mode if we need to
+ if (isInTouchMode()) {
+ View root = getRootView();
+ if (root != null) {
+ ViewRoot viewRoot = (ViewRoot)root.getParent();
+ if (viewRoot != null) {
+ viewRoot.ensureTouchMode(false);
+ }
+ }
+ }
+ return requestFocus(View.FOCUS_DOWN);
+ }
+
+ /**
+ * @return Whether any ancestor of this view blocks descendant focus.
+ */
+ private boolean hasAncestorThatBlocksDescendantFocus() {
+ ViewParent ancestor = mParent;
+ while (ancestor instanceof ViewGroup) {
+ final ViewGroup vgAncestor = (ViewGroup) ancestor;
+ if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) {
+ return true;
+ } else {
+ ancestor = vgAncestor.getParent();
+ }
+ }
+ return false;
+ }
+
+ /**
+ * This is called when a container is going to temporarily detach a child
+ * that currently has focus, with
+ * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}.
+ * It will either be followed by {@link #onFinishTemporaryDetach()} or
+ * {@link #onDetachedFromWindow()} when the container is done. Generally
+ * this is currently only done ListView for a view with focus.
+ */
+ public void onStartTemporaryDetach() {
+ }
+
+ /**
+ * Called after {@link #onStartTemporaryDetach} when the container is done
+ * changing the view.
+ */
+ public void onFinishTemporaryDetach() {
+ }
+
+ /**
+ * capture information of this view for later analysis: developement only
+ * check dynamic switch to make sure we only dump view
+ * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set
+ */
+ private static void captureViewInfo(String subTag, View v) {
+ if (v == null ||
+ SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) {
+ return;
+ }
+ ViewDebug.dumpCapturedView(subTag, v);
+ }
+
+ /**
+ * Dispatch a key event before it is processed by any input method
+ * associated with the view hierarchy. This can be used to intercept
+ * key events in special situations before the IME consumes them; a
+ * typical example would be handling the BACK key to update the application's
+ * UI instead of allowing the IME to see it and close itself.
+ *
+ * @param event The key event to be dispatched.
+ * @return True if the event was handled, false otherwise.
+ */
+ public boolean dispatchKeyEventPreIme(KeyEvent event) {
+ return onKeyPreIme(event.getKeyCode(), event);
+ }
+
+ /**
+ * Dispatch a key event to the next view on the focus path. This path runs
+ * from the top of the view tree down to the currently focused view. If this
+ * view has focus, it will dispatch to itself. Otherwise it will dispatch
+ * the next node down the focus path. This method also fires any key
+ * listeners.
+ *
+ * @param event The key event to be dispatched.
+ * @return True if the event was handled, false otherwise.
+ */
+ public boolean dispatchKeyEvent(KeyEvent event) {
+ // If any attached key listener a first crack at the event.
+ //noinspection SimplifiableIfStatement
+
+ if (android.util.Config.LOGV) {
+ captureViewInfo("captureViewKeyEvent", this);
+ }
+
+ if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
+ && mOnKeyListener.onKey(this, event.getKeyCode(), event)) {
+ return true;
+ }
+
+ return event.dispatch(this);
+ }
+
+ /**
+ * Dispatches a key shortcut event.
+ *
+ * @param event The key event to be dispatched.
+ * @return True if the event was handled by the view, false otherwise.
+ */
+ public boolean dispatchKeyShortcutEvent(KeyEvent event) {
+ return onKeyShortcut(event.getKeyCode(), event);
+ }
+
+ /**
+ * Pass the touch screen motion event down to the target view, or this
+ * view if it is the target.
+ *
+ * @param event The motion event to be dispatched.
+ * @return True if the event was handled by the view, false otherwise.
+ */
+ public boolean dispatchTouchEvent(MotionEvent event) {
+ if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED &&
+ mOnTouchListener.onTouch(this, event)) {
+ return true;
+ }
+ return onTouchEvent(event);
+ }
+
+ /**
+ * Pass a trackball motion event down to the focused view.
+ *
+ * @param event The motion event to be dispatched.
+ * @return True if the event was handled by the view, false otherwise.
+ */
+ public boolean dispatchTrackballEvent(MotionEvent event) {
+ //Log.i("view", "view=" + this + ", " + event.toString());
+ return onTrackballEvent(event);
+ }
+
+ /**
+ * Called when the window containing this view gains or loses window focus.
+ * ViewGroups should override to route to their children.
+ *
+ * @param hasFocus True if the window containing this view now has focus,
+ * false otherwise.
+ */
+ public void dispatchWindowFocusChanged(boolean hasFocus) {
+ onWindowFocusChanged(hasFocus);
+ }
+
+ /**
+ * Called when the window containing this view gains or loses focus. Note
+ * that this is separate from view focus: to receive key events, both
+ * your view and its window must have focus. If a window is displayed
+ * on top of yours that takes input focus, then your own window will lose
+ * focus but the view focus will remain unchanged.
+ *
+ * @param hasWindowFocus True if the window containing this view now has
+ * focus, false otherwise.
+ */
+ public void onWindowFocusChanged(boolean hasWindowFocus) {
+ InputMethodManager imm = InputMethodManager.peekInstance();
+ if (!hasWindowFocus) {
+ if (isPressed()) {
+ setPressed(false);
+ }
+ if (imm != null && (mPrivateFlags & FOCUSED) != 0) {
+ imm.focusOut(this);
+ }
+ } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) {
+ imm.focusIn(this);
+ }
+ refreshDrawableState();
+ }
+
+ /**
+ * Returns true if this view is in a window that currently has window focus.
+ * Note that this is not the same as the view itself having focus.
+ *
+ * @return True if this view is in a window that currently has window focus.
+ */
+ public boolean hasWindowFocus() {
+ return mAttachInfo != null && mAttachInfo.mHasWindowFocus;
+ }
+
+ /**
+ * Dispatch a window visibility change down the view hierarchy.
+ * ViewGroups should override to route to their children.
+ *
+ * @param visibility The new visibility of the window.
+ *
+ * @see #onWindowVisibilityChanged
+ */
+ public void dispatchWindowVisibilityChanged(int visibility) {
+ onWindowVisibilityChanged(visibility);
+ }
+
+ /**
+ * Called when the window containing has change its visibility
+ * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note
+ * that this tells you whether or not your window is being made visible
+ * to the window manager; this does <em>not</em> tell you whether or not
+ * your window is obscured by other windows on the screen, even if it
+ * is itself visible.
+ *
+ * @param visibility The new visibility of the window.
+ */
+ protected void onWindowVisibilityChanged(int visibility) {
+ }
+
+ /**
+ * Returns the current visibility of the window this view is attached to
+ * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}).
+ *
+ * @return Returns the current visibility of the view's window.
+ */
+ public int getWindowVisibility() {
+ return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE;
+ }
+
+ /**
+ * Retrieve the overall visible display size in which the window this view is
+ * attached to has been positioned in. This takes into account screen
+ * decorations above the window, for both cases where the window itself
+ * is being position inside of them or the window is being placed under
+ * then and covered insets are used for the window to position its content
+ * inside. In effect, this tells you the available area where content can
+ * be placed and remain visible to users.
+ *
+ * <p>This function requires an IPC back to the window manager to retrieve
+ * the requested information, so should not be used in performance critical
+ * code like drawing.
+ *
+ * @param outRect Filled in with the visible display frame. If the view
+ * is not attached to a window, this is simply the raw display size.
+ */
+ public void getWindowVisibleDisplayFrame(Rect outRect) {
+ if (mAttachInfo != null) {
+ try {
+ mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
+ } catch (RemoteException e) {
+ return;
+ }
+ // XXX This is really broken, and probably all needs to be done
+ // in the window manager, and we need to know more about whether
+ // we want the area behind or in front of the IME.
+ final Rect insets = mAttachInfo.mVisibleInsets;
+ outRect.left += insets.left;
+ outRect.top += insets.top;
+ outRect.right -= insets.right;
+ outRect.bottom -= insets.bottom;
+ return;
+ }
+ Display d = WindowManagerImpl.getDefault().getDefaultDisplay();
+ outRect.set(0, 0, d.getWidth(), d.getHeight());
+ }
+
+ /**
+ * Private function to aggregate all per-view attributes in to the view
+ * root.
+ */
+ void dispatchCollectViewAttributes(int visibility) {
+ performCollectViewAttributes(visibility);
+ }
+
+ void performCollectViewAttributes(int visibility) {
+ //noinspection PointlessBitwiseExpression
+ if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON))
+ == (VISIBLE | KEEP_SCREEN_ON)) {
+ mAttachInfo.mKeepScreenOn = true;
+ }
+ }
+
+ void needGlobalAttributesUpdate(boolean force) {
+ AttachInfo ai = mAttachInfo;
+ if (ai != null) {
+ if (ai.mKeepScreenOn || force) {
+ ai.mRecomputeGlobalAttributes = true;
+ }
+ }
+ }
+
+ /**
+ * Returns whether the device is currently in touch mode. Touch mode is entered
+ * once the user begins interacting with the device by touch, and affects various
+ * things like whether focus is always visible to the user.
+ *
+ * @return Whether the device is in touch mode.
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isInTouchMode() {
+ if (mAttachInfo != null) {
+ return mAttachInfo.mInTouchMode;
+ } else {
+ return ViewRoot.isInTouchMode();
+ }
+ }
+
+ /**
+ * Returns the context the view is running in, through which it can
+ * access the current theme, resources, etc.
+ *
+ * @return The view's Context.
+ */
+ @ViewDebug.CapturedViewProperty
+ public final Context getContext() {
+ return mContext;
+ }
+
+ /**
+ * Handle a key event before it is processed by any input method
+ * associated with the view hierarchy. This can be used to intercept
+ * key events in special situations before the IME consumes them; a
+ * typical example would be handling the BACK key to update the application's
+ * UI instead of allowing the IME to see it and close itself.
+ *
+ * @param keyCode The value in event.getKeyCode().
+ * @param event Description of the key event.
+ * @return If you handled the event, return true. If you want to allow the
+ * event to be handled by the next receiver, return false.
+ */
+ public boolean onKeyPreIme(int keyCode, KeyEvent event) {
+ return false;
+ }
+
+ /**
+ * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
+ * KeyEvent.Callback.onKeyMultiple()}: perform press of the view
+ * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER}
+ * is released, if the view is enabled and clickable.
+ *
+ * @param keyCode A key code that represents the button pressed, from
+ * {@link android.view.KeyEvent}.
+ * @param event The KeyEvent object that defines the button action.
+ */
+ public boolean onKeyDown(int keyCode, KeyEvent event) {
+ boolean result = false;
+
+ switch (keyCode) {
+ case KeyEvent.KEYCODE_DPAD_CENTER:
+ case KeyEvent.KEYCODE_ENTER: {
+ if ((mViewFlags & ENABLED_MASK) == DISABLED) {
+ return true;
+ }
+ // Long clickable items don't necessarily have to be clickable
+ if (((mViewFlags & CLICKABLE) == CLICKABLE ||
+ (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) &&
+ (event.getRepeatCount() == 0)) {
+ setPressed(true);
+ if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) {
+ postCheckForLongClick();
+ }
+ return true;
+ }
+ break;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
+ * KeyEvent.Callback.onKeyMultiple()}: perform clicking of the view
+ * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or
+ * {@link KeyEvent#KEYCODE_ENTER} is released.
+ *
+ * @param keyCode A key code that represents the button pressed, from
+ * {@link android.view.KeyEvent}.
+ * @param event The KeyEvent object that defines the button action.
+ */
+ public boolean onKeyUp(int keyCode, KeyEvent event) {
+ boolean result = false;
+
+ switch (keyCode) {
+ case KeyEvent.KEYCODE_DPAD_CENTER:
+ case KeyEvent.KEYCODE_ENTER: {
+ if ((mViewFlags & ENABLED_MASK) == DISABLED) {
+ return true;
+ }
+ if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) {
+ setPressed(false);
+
+ if (!mHasPerformedLongPress) {
+ // This is a tap, so remove the longpress check
+ if (mPendingCheckForLongPress != null) {
+ removeCallbacks(mPendingCheckForLongPress);
+ }
+
+ result = performClick();
+ }
+ }
+ break;
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
+ * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle
+ * the event).
+ *
+ * @param keyCode A key code that represents the button pressed, from
+ * {@link android.view.KeyEvent}.
+ * @param repeatCount The number of times the action was made.
+ * @param event The KeyEvent object that defines the button action.
+ */
+ public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
+ return false;
+ }
+
+ /**
+ * Called when an unhandled key shortcut event occurs.
+ *
+ * @param keyCode The value in event.getKeyCode().
+ * @param event Description of the key event.
+ * @return If you handled the event, return true. If you want to allow the
+ * event to be handled by the next receiver, return false.
+ */
+ public boolean onKeyShortcut(int keyCode, KeyEvent event) {
+ return false;
+ }
+
+ /**
+ * Check whether the called view is a text editor, in which case it
+ * would make sense to automatically display a soft input window for
+ * it. Subclasses should override this if they implement
+ * {@link #onCreateInputConnection(EditorInfo)} to return true if
+ * a call on that method would return a non-null InputConnection. The
+ * default implementation always returns false.
+ *
+ * @return Returns true if this view is a text editor, else false.
+ */
+ public boolean onCheckIsTextEditor() {
+ return false;
+ }
+
+ /**
+ * Create a new InputConnection for an InputMethod to interact
+ * with the view. The default implementation returns null, since it doesn't
+ * support input methods. You can override this to implement such support.
+ * This is only needed for views that take focus and text input.
+ *
+ * <p>When implementing this, you probably also want to implement
+ * {@link #onCheckIsTextEditor()} to indicate you will return a
+ * non-null InputConnection.
+ *
+ * @param outAttrs Fill in with attribute information about the connection.
+ */
+ public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
+ return null;
+ }
+
+ /**
+ * Show the context menu for this view. It is not safe to hold on to the
+ * menu after returning from this method.
+ *
+ * @param menu The context menu to populate
+ */
+ public void createContextMenu(ContextMenu menu) {
+ ContextMenuInfo menuInfo = getContextMenuInfo();
+
+ // Sets the current menu info so all items added to menu will have
+ // my extra info set.
+ ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);
+
+ onCreateContextMenu(menu);
+ if (mOnCreateContextMenuListener != null) {
+ mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
+ }
+
+ // Clear the extra information so subsequent items that aren't mine don't
+ // have my extra info.
+ ((MenuBuilder)menu).setCurrentMenuInfo(null);
+
+ if (mParent != null) {
+ mParent.createContextMenu(menu);
+ }
+ }
+
+ /**
+ * Views should implement this if they have extra information to associate
+ * with the context menu. The return result is supplied as a parameter to
+ * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)}
+ * callback.
+ *
+ * @return Extra information about the item for which the context menu
+ * should be shown. This information will vary across different
+ * subclasses of View.
+ */
+ protected ContextMenuInfo getContextMenuInfo() {
+ return null;
+ }
+
+ /**
+ * Views should implement this if the view itself is going to add items to
+ * the context menu.
+ *
+ * @param menu the context menu to populate
+ */
+ protected void onCreateContextMenu(ContextMenu menu) {
+ }
+
+ /**
+ * Implement this method to handle trackball motion events. The
+ * <em>relative</em> movement of the trackball since the last event
+ * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and
+ * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so
+ * that a movement of 1 corresponds to the user pressing one DPAD key (so
+ * they will often be fractional values, representing the more fine-grained
+ * movement information available from a trackball).
+ *
+ * @param event The motion event.
+ * @return True if the event was handled, false otherwise.
+ */
+ public boolean onTrackballEvent(MotionEvent event) {
+ return false;
+ }
+
+ /**
+ * Implement this method to handle touch screen motion events.
+ *
+ * @param event The motion event.
+ * @return True if the event was handled, false otherwise.
+ */
+ public boolean onTouchEvent(MotionEvent event) {
+ final int viewFlags = mViewFlags;
+
+ if ((viewFlags & ENABLED_MASK) == DISABLED) {
+ // A disabled view that is clickable still consumes the touch
+ // events, it just doesn't respond to them.
+ return (((viewFlags & CLICKABLE) == CLICKABLE ||
+ (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE));
+ }
+
+ if (mTouchDelegate != null) {
+ if (mTouchDelegate.onTouchEvent(event)) {
+ return true;
+ }
+ }
+
+ if (((viewFlags & CLICKABLE) == CLICKABLE ||
+ (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) {
+ switch (event.getAction()) {
+ case MotionEvent.ACTION_UP:
+ if ((mPrivateFlags & PRESSED) != 0) {
+ // take focus if we don't have it already and we should in
+ // touch mode.
+ boolean focusTaken = false;
+ if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
+ focusTaken = requestFocus();
+ }
+
+ if (!mHasPerformedLongPress) {
+ // This is a tap, so remove the longpress check
+ if (mPendingCheckForLongPress != null) {
+ removeCallbacks(mPendingCheckForLongPress);
+ }
+
+ // Only perform take click actions if we were in the pressed state
+ if (!focusTaken) {
+ performClick();
+ }
+ }
+
+ if (mUnsetPressedState == null) {
+ mUnsetPressedState = new UnsetPressedState();
+ }
+
+ if (!post(mUnsetPressedState)) {
+ // If the post failed, unpress right now
+ mUnsetPressedState.run();
+ }
+ }
+ break;
+
+ case MotionEvent.ACTION_DOWN:
+ mPrivateFlags |= PRESSED;
+ refreshDrawableState();
+ if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) {
+ postCheckForLongClick();
+ }
+ break;
+
+ case MotionEvent.ACTION_CANCEL:
+ mPrivateFlags &= ~PRESSED;
+ refreshDrawableState();
+ break;
+
+ case MotionEvent.ACTION_MOVE:
+ final int x = (int) event.getX();
+ final int y = (int) event.getY();
+
+ // Be lenient about moving outside of buttons
+ int slop = ViewConfiguration.get(mContext).getScaledTouchSlop();
+ if ((x < 0 - slop) || (x >= getWidth() + slop) ||
+ (y < 0 - slop) || (y >= getHeight() + slop)) {
+ // Outside button
+ if ((mPrivateFlags & PRESSED) != 0) {
+ // Remove any future long press checks
+ if (mPendingCheckForLongPress != null) {
+ removeCallbacks(mPendingCheckForLongPress);
+ }
+
+ // Need to switch from pressed to not pressed
+ mPrivateFlags &= ~PRESSED;
+ refreshDrawableState();
+ }
+ } else {
+ // Inside button
+ if ((mPrivateFlags & PRESSED) == 0) {
+ // Need to switch from not pressed to pressed
+ mPrivateFlags |= PRESSED;
+ refreshDrawableState();
+ }
+ }
+ break;
+ }
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Cancels a pending long press. Your subclass can use this if you
+ * want the context menu to come up if the user presses and holds
+ * at the same place, but you don't want it to come up if they press
+ * and then move around enough to cause scrolling.
+ */
+ public void cancelLongPress() {
+ if (mPendingCheckForLongPress != null) {
+ removeCallbacks(mPendingCheckForLongPress);
+ }
+ }
+
+ /**
+ * Sets the TouchDelegate for this View.
+ */
+ public void setTouchDelegate(TouchDelegate delegate) {
+ mTouchDelegate = delegate;
+ }
+
+ /**
+ * Gets the TouchDelegate for this View.
+ */
+ public TouchDelegate getTouchDelegate() {
+ return mTouchDelegate;
+ }
+
+ /**
+ * Set flags controlling behavior of this view.
+ *
+ * @param flags Constant indicating the value which should be set
+ * @param mask Constant indicating the bit range that should be changed
+ */
+ void setFlags(int flags, int mask) {
+ int old = mViewFlags;
+ mViewFlags = (mViewFlags & ~mask) | (flags & mask);
+
+ int changed = mViewFlags ^ old;
+ if (changed == 0) {
+ return;
+ }
+ int privateFlags = mPrivateFlags;
+
+ /* Check if the FOCUSABLE bit has changed */
+ if (((changed & FOCUSABLE_MASK) != 0) &&
+ ((privateFlags & HAS_BOUNDS) !=0)) {
+ if (((old & FOCUSABLE_MASK) == FOCUSABLE)
+ && ((privateFlags & FOCUSED) != 0)) {
+ /* Give up focus if we are no longer focusable */
+ clearFocus();
+ } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE)
+ && ((privateFlags & FOCUSED) == 0)) {
+ /*
+ * Tell the view system that we are now available to take focus
+ * if no one else already has it.
+ */
+ if (mParent != null) mParent.focusableViewAvailable(this);
+ }
+ }
+
+ if ((flags & VISIBILITY_MASK) == VISIBLE) {
+ if ((changed & VISIBILITY_MASK) != 0) {
+ /*
+ * If this view is becoming visible, set the DRAWN flag so that
+ * the next invalidate() will not be skipped.
+ */
+ mPrivateFlags |= DRAWN;
+
+ needGlobalAttributesUpdate(true);
+
+ // a view becoming visible is worth notifying the parent
+ // about in case nothing has focus. even if this specific view
+ // isn't focusable, it may contain something that is, so let
+ // the root view try to give this focus if nothing else does.
+ if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) {
+ mParent.focusableViewAvailable(this);
+ }
+ }
+ }
+
+ /* Check if the GONE bit has changed */
+ if ((changed & GONE) != 0) {
+ needGlobalAttributesUpdate(false);
+ requestLayout();
+ invalidate();
+
+ if (((mViewFlags & VISIBILITY_MASK) == GONE) && hasFocus()) {
+ clearFocus();
+ }
+ if (mAttachInfo != null) {
+ mAttachInfo.mViewVisibilityChanged = true;
+ }
+ }
+
+ /* Check if the VISIBLE bit has changed */
+ if ((changed & INVISIBLE) != 0) {
+ needGlobalAttributesUpdate(false);
+ invalidate();
+
+ if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) {
+ // root view becoming invisible shouldn't clear focus
+ if (getRootView() != this) {
+ clearFocus();
+ }
+ }
+ if (mAttachInfo != null) {
+ mAttachInfo.mViewVisibilityChanged = true;
+ }
+ }
+
+ if ((changed & WILL_NOT_CACHE_DRAWING) != 0) {
+ destroyDrawingCache();
+ }
+
+ if ((changed & DRAWING_CACHE_ENABLED) != 0) {
+ destroyDrawingCache();
+ mPrivateFlags &= ~DRAWING_CACHE_VALID;
+ }
+
+ if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) {
+ destroyDrawingCache();
+ mPrivateFlags &= ~DRAWING_CACHE_VALID;
+ }
+
+ if ((changed & DRAW_MASK) != 0) {
+ if ((mViewFlags & WILL_NOT_DRAW) != 0) {
+ if (mBGDrawable != null) {
+ mPrivateFlags &= ~SKIP_DRAW;
+ mPrivateFlags |= ONLY_DRAWS_BACKGROUND;
+ } else {
+ mPrivateFlags |= SKIP_DRAW;
+ }
+ } else {
+ mPrivateFlags &= ~SKIP_DRAW;
+ }
+ requestLayout();
+ invalidate();
+ }
+
+ if ((changed & KEEP_SCREEN_ON) != 0) {
+ if (mParent != null) {
+ mParent.recomputeViewAttributes(this);
+ }
+ }
+ }
+
+ /**
+ * Change the view's z order in the tree, so it's on top of other sibling
+ * views
+ */
+ public void bringToFront() {
+ if (mParent != null) {
+ mParent.bringChildToFront(this);
+ }
+ }
+
+ /**
+ * This is called in response to an internal scroll in this view (i.e., the
+ * view scrolled its own contents). This is typically as a result of
+ * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been
+ * called.
+ *
+ * @param l Current horizontal scroll origin.
+ * @param t Current vertical scroll origin.
+ * @param oldl Previous horizontal scroll origin.
+ * @param oldt Previous vertical scroll origin.
+ */
+ protected void onScrollChanged(int l, int t, int oldl, int oldt) {
+ mBackgroundSizeChanged = true;
+
+ final AttachInfo ai = mAttachInfo;
+ if (ai != null) {
+ ai.mViewScrollChanged = true;
+ }
+ }
+
+ /**
+ * This is called during layout when the size of this view has changed. If
+ * you were just added to the view hierarchy, you're called with the old
+ * values of 0.
+ *
+ * @param w Current width of this view.
+ * @param h Current height of this view.
+ * @param oldw Old width of this view.
+ * @param oldh Old height of this view.
+ */
+ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+ }
+
+ /**
+ * Called by draw to draw the child views. This may be overridden
+ * by derived classes to gain control just before its children are drawn
+ * (but after its own view has been drawn).
+ * @param canvas the canvas on which to draw the view
+ */
+ protected void dispatchDraw(Canvas canvas) {
+ }
+
+ /**
+ * Gets the parent of this view. Note that the parent is a
+ * ViewParent and not necessarily a View.
+ *
+ * @return Parent of this view.
+ */
+ public final ViewParent getParent() {
+ return mParent;
+ }
+
+ /**
+ * Return the scrolled left position of this view. This is the left edge of
+ * the displayed part of your view. You do not need to draw any pixels
+ * farther left, since those are outside of the frame of your view on
+ * screen.
+ *
+ * @return The left edge of the displayed part of your view, in pixels.
+ */
+ public final int getScrollX() {
+ return mScrollX;
+ }
+
+ /**
+ * Return the scrolled top position of this view. This is the top edge of
+ * the displayed part of your view. You do not need to draw any pixels above
+ * it, since those are outside of the frame of your view on screen.
+ *
+ * @return The top edge of the displayed part of your view, in pixels.
+ */
+ public final int getScrollY() {
+ return mScrollY;
+ }
+
+ /**
+ * Return the width of the your view.
+ *
+ * @return The width of your view, in pixels.
+ */
+ @ViewDebug.ExportedProperty
+ public final int getWidth() {
+ return mRight - mLeft;
+ }
+
+ /**
+ * Return the height of your view.
+ *
+ * @return The height of your view, in pixels.
+ */
+ @ViewDebug.ExportedProperty
+ public final int getHeight() {
+ return mBottom - mTop;
+ }
+
+ /**
+ * Return the visible drawing bounds of your view. Fills in the output
+ * rectangle with the values from getScrollX(), getScrollY(),
+ * getWidth(), and getHeight().
+ *
+ * @param outRect The (scrolled) drawing bounds of the view.
+ */
+ public void getDrawingRect(Rect outRect) {
+ outRect.left = mScrollX;
+ outRect.top = mScrollY;
+ outRect.right = mScrollX + (mRight - mLeft);
+ outRect.bottom = mScrollY + (mBottom - mTop);
+ }
+
+ /**
+ * The width of this view as measured in the most recent call to measure().
+ * This should be used during measurement and layout calculations only. Use
+ * {@link #getWidth()} to see how wide a view is after layout.
+ *
+ * @return The measured width of this view.
+ */
+ public final int getMeasuredWidth() {
+ return mMeasuredWidth;
+ }
+
+ /**
+ * The height of this view as measured in the most recent call to measure().
+ * This should be used during measurement and layout calculations only. Use
+ * {@link #getHeight()} to see how tall a view is after layout.
+ *
+ * @return The measured height of this view.
+ */
+ public final int getMeasuredHeight() {
+ return mMeasuredHeight;
+ }
+
+ /**
+ * Top position of this view relative to its parent.
+ *
+ * @return The top of this view, in pixels.
+ */
+ @ViewDebug.CapturedViewProperty
+ public final int getTop() {
+ return mTop;
+ }
+
+ /**
+ * Bottom position of this view relative to its parent.
+ *
+ * @return The bottom of this view, in pixels.
+ */
+ @ViewDebug.CapturedViewProperty
+ public final int getBottom() {
+ return mBottom;
+ }
+
+ /**
+ * Left position of this view relative to its parent.
+ *
+ * @return The left edge of this view, in pixels.
+ */
+ @ViewDebug.CapturedViewProperty
+ public final int getLeft() {
+ return mLeft;
+ }
+
+ /**
+ * Right position of this view relative to its parent.
+ *
+ * @return The right edge of this view, in pixels.
+ */
+ @ViewDebug.CapturedViewProperty
+ public final int getRight() {
+ return mRight;
+ }
+
+ /**
+ * Hit rectangle in parent's coordinates
+ *
+ * @param outRect The hit rectangle of the view.
+ */
+ public void getHitRect(Rect outRect) {
+ outRect.set(mLeft, mTop, mRight, mBottom);
+ }
+
+ /**
+ * When a view has focus and the user navigates away from it, the next view is searched for
+ * starting from the rectangle filled in by this method.
+ *
+ * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your
+ * view maintains some idea of internal selection, such as a cursor, or a selected row
+ * or column, you should override this method and fill in a more specific rectangle.
+ *
+ * @param r The rectangle to fill in, in this view's coordinates.
+ */
+ public void getFocusedRect(Rect r) {
+ getDrawingRect(r);
+ }
+
+ /**
+ * If some part of this view is not clipped by any of its parents, then
+ * return that area in r in global (root) coordinates. To convert r to local
+ * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x,
+ * -globalOffset.y)) If the view is completely clipped or translated out,
+ * return false.
+ *
+ * @param r If true is returned, r holds the global coordinates of the
+ * visible portion of this view.
+ * @param globalOffset If true is returned, globalOffset holds the dx,dy
+ * between this view and its root. globalOffet may be null.
+ * @return true if r is non-empty (i.e. part of the view is visible at the
+ * root level.
+ */
+ public boolean getGlobalVisibleRect(Rect r, Point globalOffset) {
+ int width = mRight - mLeft;
+ int height = mBottom - mTop;
+ if (width > 0 && height > 0) {
+ r.set(0, 0, width, height);
+ if (globalOffset != null) {
+ globalOffset.set(-mScrollX, -mScrollY);
+ }
+ return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset);
+ }
+ return false;
+ }
+
+ public final boolean getGlobalVisibleRect(Rect r) {
+ return getGlobalVisibleRect(r, null);
+ }
+
+ public final boolean getLocalVisibleRect(Rect r) {
+ Point offset = new Point();
+ if (getGlobalVisibleRect(r, offset)) {
+ r.offset(-offset.x, -offset.y); // make r local
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Offset this view's vertical location by the specified number of pixels.
+ *
+ * @param offset the number of pixels to offset the view by
+ */
+ public void offsetTopAndBottom(int offset) {
+ mTop += offset;
+ mBottom += offset;
+ }
+
+ /**
+ * Offset this view's horizontal location by the specified amount of pixels.
+ *
+ * @param offset the numer of pixels to offset the view by
+ */
+ public void offsetLeftAndRight(int offset) {
+ mLeft += offset;
+ mRight += offset;
+ }
+
+ /**
+ * Get the LayoutParams associated with this view. All views should have
+ * layout parameters. These supply parameters to the <i>parent</i> of this
+ * view specifying how it should be arranged. There are many subclasses of
+ * ViewGroup.LayoutParams, and these correspond to the different subclasses
+ * of ViewGroup that are responsible for arranging their children.
+ * @return The LayoutParams associated with this view
+ */
+ @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_")
+ public ViewGroup.LayoutParams getLayoutParams() {
+ return mLayoutParams;
+ }
+
+ /**
+ * Set the layout parameters associated with this view. These supply
+ * parameters to the <i>parent</i> of this view specifying how it should be
+ * arranged. There are many subclasses of ViewGroup.LayoutParams, and these
+ * correspond to the different subclasses of ViewGroup that are responsible
+ * for arranging their children.
+ *
+ * @param params the layout parameters for this view
+ */
+ public void setLayoutParams(ViewGroup.LayoutParams params) {
+ if (params == null) {
+ throw new NullPointerException("params == null");
+ }
+ mLayoutParams = params;
+ requestLayout();
+ }
+
+ /**
+ * Set the scrolled position of your view. This will cause a call to
+ * {@link #onScrollChanged(int, int, int, int)} and the view will be
+ * invalidated.
+ * @param x the x position to scroll to
+ * @param y the y position to scroll to
+ */
+ public void scrollTo(int x, int y) {
+ if (mScrollX != x || mScrollY != y) {
+ int oldX = mScrollX;
+ int oldY = mScrollY;
+ mScrollX = x;
+ mScrollY = y;
+ onScrollChanged(mScrollX, mScrollY, oldX, oldY);
+ invalidate();
+ }
+ }
+
+ /**
+ * Move the scrolled position of your view. This will cause a call to
+ * {@link #onScrollChanged(int, int, int, int)} and the view will be
+ * invalidated.
+ * @param x the amount of pixels to scroll by horizontally
+ * @param y the amount of pixels to scroll by vertically
+ */
+ public void scrollBy(int x, int y) {
+ scrollTo(mScrollX + x, mScrollY + y);
+ }
+
+ /**
+ * Mark the the area defined by dirty as needing to be drawn. If the view is
+ * visible, {@link #onDraw} will be called at some point in the future.
+ * This must be called from a UI thread. To call from a non-UI thread, call
+ * {@link #postInvalidate()}.
+ *
+ * WARNING: This method is destructive to dirty.
+ * @param dirty the rectangle representing the bounds of the dirty region
+ */
+ public void invalidate(Rect dirty) {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE);
+ }
+
+ if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) {
+ mPrivateFlags &= ~DRAWING_CACHE_VALID;
+ final ViewParent p = mParent;
+ final AttachInfo ai = mAttachInfo;
+ if (p != null && ai != null) {
+ final int scrollX = mScrollX;
+ final int scrollY = mScrollY;
+ final Rect r = ai.mTmpInvalRect;
+ r.set(dirty.left - scrollX, dirty.top - scrollY,
+ dirty.right - scrollX, dirty.bottom - scrollY);
+ mParent.invalidateChild(this, r);
+ }
+ }
+ }
+
+ /**
+ * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn.
+ * The coordinates of the dirty rect are relative to the view.
+ * If the view is visible, {@link #onDraw} will be called at some point
+ * in the future. This must be called from a UI thread. To call
+ * from a non-UI thread, call {@link #postInvalidate()}.
+ * @param l the left position of the dirty region
+ * @param t the top position of the dirty region
+ * @param r the right position of the dirty region
+ * @param b the bottom position of the dirty region
+ */
+ public void invalidate(int l, int t, int r, int b) {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE);
+ }
+
+ if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) {
+ mPrivateFlags &= ~DRAWING_CACHE_VALID;
+ final ViewParent p = mParent;
+ final AttachInfo ai = mAttachInfo;
+ if (p != null && ai != null && l < r && t < b) {
+ final int scrollX = mScrollX;
+ final int scrollY = mScrollY;
+ final Rect tmpr = ai.mTmpInvalRect;
+ tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY);
+ p.invalidateChild(this, tmpr);
+ }
+ }
+ }
+
+ /**
+ * Invalidate the whole view. If the view is visible, {@link #onDraw} will
+ * be called at some point in the future. This must be called from a
+ * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}.
+ */
+ public void invalidate() {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE);
+ }
+
+ if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) {
+ mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID;
+ final ViewParent p = mParent;
+ final AttachInfo ai = mAttachInfo;
+ if (p != null && ai != null) {
+ final Rect r = ai.mTmpInvalRect;
+ r.set(0, 0, mRight - mLeft, mBottom - mTop);
+ // Don't call invalidate -- we don't want to internally scroll
+ // our own bounds
+ p.invalidateChild(this, r);
+ }
+ }
+ }
+
+ /**
+ * @return A handler associated with the thread running the View. This
+ * handler can be used to pump events in the UI events queue.
+ */
+ public Handler getHandler() {
+ if (mAttachInfo != null) {
+ return mAttachInfo.mHandler;
+ }
+ return null;
+ }
+
+ /**
+ * Causes the Runnable to be added to the message queue.
+ * The runnable will be run on the user interface thread.
+ *
+ * @param action The Runnable that will be executed.
+ *
+ * @return Returns true if the Runnable was successfully placed in to the
+ * message queue. Returns false on failure, usually because the
+ * looper processing the message queue is exiting.
+ */
+ public boolean post(Runnable action) {
+ Handler handler;
+ if (mAttachInfo != null) {
+ handler = mAttachInfo.mHandler;
+ } else {
+ // Assume that post will succeed later
+ ViewRoot.getRunQueue().post(action);
+ return true;
+ }
+
+ return handler.post(action);
+ }
+
+ /**
+ * Causes the Runnable to be added to the message queue, to be run
+ * after the specified amount of time elapses.
+ * The runnable will be run on the user interface thread.
+ *
+ * @param action The Runnable that will be executed.
+ * @param delayMillis The delay (in milliseconds) until the Runnable
+ * will be executed.
+ *
+ * @return true if the Runnable was successfully placed in to the
+ * message queue. Returns false on failure, usually because the
+ * looper processing the message queue is exiting. Note that a
+ * result of true does not mean the Runnable will be processed --
+ * if the looper is quit before the delivery time of the message
+ * occurs then the message will be dropped.
+ */
+ public boolean postDelayed(Runnable action, long delayMillis) {
+ Handler handler;
+ if (mAttachInfo != null) {
+ handler = mAttachInfo.mHandler;
+ } else {
+ // Assume that post will succeed later
+ ViewRoot.getRunQueue().postDelayed(action, delayMillis);
+ return true;
+ }
+
+ return handler.postDelayed(action, delayMillis);
+ }
+
+ /**
+ * Removes the specified Runnable from the message queue.
+ *
+ * @param action The Runnable to remove from the message handling queue
+ *
+ * @return true if this view could ask the Handler to remove the Runnable,
+ * false otherwise. When the returned value is true, the Runnable
+ * may or may not have been actually removed from the message queue
+ * (for instance, if the Runnable was not in the queue already.)
+ */
+ public boolean removeCallbacks(Runnable action) {
+ Handler handler;
+ if (mAttachInfo != null) {
+ handler = mAttachInfo.mHandler;
+ } else {
+ // Assume that post will succeed later
+ ViewRoot.getRunQueue().removeCallbacks(action);
+ return true;
+ }
+
+ handler.removeCallbacks(action);
+ return true;
+ }
+
+ /**
+ * Cause an invalidate to happen on a subsequent cycle through the event loop.
+ * Use this to invalidate the View from a non-UI thread.
+ *
+ * @see #invalidate()
+ */
+ public void postInvalidate() {
+ postInvalidateDelayed(0);
+ }
+
+ /**
+ * Cause an invalidate of the specified area to happen on a subsequent cycle
+ * through the event loop. Use this to invalidate the View from a non-UI thread.
+ *
+ * @param left The left coordinate of the rectangle to invalidate.
+ * @param top The top coordinate of the rectangle to invalidate.
+ * @param right The right coordinate of the rectangle to invalidate.
+ * @param bottom The bottom coordinate of the rectangle to invalidate.
+ *
+ * @see #invalidate(int, int, int, int)
+ * @see #invalidate(Rect)
+ */
+ public void postInvalidate(int left, int top, int right, int bottom) {
+ postInvalidateDelayed(0, left, top, right, bottom);
+ }
+
+ /**
+ * Cause an invalidate to happen on a subsequent cycle through the event
+ * loop. Waits for the specified amount of time.
+ *
+ * @param delayMilliseconds the duration in milliseconds to delay the
+ * invalidation by
+ */
+ public void postInvalidateDelayed(long delayMilliseconds) {
+ // We try only with the AttachInfo because there's no point in invalidating
+ // if we are not attached to our window
+ if (mAttachInfo != null) {
+ Message msg = Message.obtain();
+ msg.what = AttachInfo.INVALIDATE_MSG;
+ msg.obj = this;
+ mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds);
+ }
+ }
+
+ /**
+ * Cause an invalidate of the specified area to happen on a subsequent cycle
+ * through the event loop. Waits for the specified amount of time.
+ *
+ * @param delayMilliseconds the duration in milliseconds to delay the
+ * invalidation by
+ * @param left The left coordinate of the rectangle to invalidate.
+ * @param top The top coordinate of the rectangle to invalidate.
+ * @param right The right coordinate of the rectangle to invalidate.
+ * @param bottom The bottom coordinate of the rectangle to invalidate.
+ */
+ public void postInvalidateDelayed(long delayMilliseconds, int left, int top,
+ int right, int bottom) {
+
+ // We try only with the AttachInfo because there's no point in invalidating
+ // if we are not attached to our window
+ if (mAttachInfo != null) {
+ final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire();
+ info.target = this;
+ info.left = left;
+ info.top = top;
+ info.right = right;
+ info.bottom = bottom;
+
+ final Message msg = Message.obtain();
+ msg.what = AttachInfo.INVALIDATE_RECT_MSG;
+ msg.obj = info;
+ mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds);
+ }
+ }
+
+ /**
+ * Called by a parent to request that a child update its values for mScrollX
+ * and mScrollY if necessary. This will typically be done if the child is
+ * animating a scroll using a {@link android.widget.Scroller Scroller}
+ * object.
+ */
+ public void computeScroll() {
+ }
+
+ /**
+ * <p>Indicate whether the horizontal edges are faded when the view is
+ * scrolled horizontally.</p>
+ *
+ * @return true if the horizontal edges should are faded on scroll, false
+ * otherwise
+ *
+ * @see #setHorizontalFadingEdgeEnabled(boolean)
+ * @attr ref android.R.styleable#View_fadingEdge
+ */
+ public boolean isHorizontalFadingEdgeEnabled() {
+ return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL;
+ }
+
+ /**
+ * <p>Define whether the horizontal edges should be faded when this view
+ * is scrolled horizontally.</p>
+ *
+ * @param horizontalFadingEdgeEnabled true if the horizontal edges should
+ * be faded when the view is scrolled
+ * horizontally
+ *
+ * @see #isHorizontalFadingEdgeEnabled()
+ * @attr ref android.R.styleable#View_fadingEdge
+ */
+ public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) {
+ if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) {
+ if (horizontalFadingEdgeEnabled) {
+ initScrollCache();
+ }
+
+ mViewFlags ^= FADING_EDGE_HORIZONTAL;
+ }
+ }
+
+ /**
+ * <p>Indicate whether the vertical edges are faded when the view is
+ * scrolled horizontally.</p>
+ *
+ * @return true if the vertical edges should are faded on scroll, false
+ * otherwise
+ *
+ * @see #setVerticalFadingEdgeEnabled(boolean)
+ * @attr ref android.R.styleable#View_fadingEdge
+ */
+ public boolean isVerticalFadingEdgeEnabled() {
+ return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL;
+ }
+
+ /**
+ * <p>Define whether the vertical edges should be faded when this view
+ * is scrolled vertically.</p>
+ *
+ * @param verticalFadingEdgeEnabled true if the vertical edges should
+ * be faded when the view is scrolled
+ * vertically
+ *
+ * @see #isVerticalFadingEdgeEnabled()
+ * @attr ref android.R.styleable#View_fadingEdge
+ */
+ public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) {
+ if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) {
+ if (verticalFadingEdgeEnabled) {
+ initScrollCache();
+ }
+
+ mViewFlags ^= FADING_EDGE_VERTICAL;
+ }
+ }
+
+ /**
+ * Returns the strength, or intensity, of the top faded edge. The strength is
+ * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
+ * returns 0.0 or 1.0 but no value in between.
+ *
+ * Subclasses should override this method to provide a smoother fade transition
+ * when scrolling occurs.
+ *
+ * @return the intensity of the top fade as a float between 0.0f and 1.0f
+ */
+ protected float getTopFadingEdgeStrength() {
+ return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f;
+ }
+
+ /**
+ * Returns the strength, or intensity, of the bottom faded edge. The strength is
+ * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
+ * returns 0.0 or 1.0 but no value in between.
+ *
+ * Subclasses should override this method to provide a smoother fade transition
+ * when scrolling occurs.
+ *
+ * @return the intensity of the bottom fade as a float between 0.0f and 1.0f
+ */
+ protected float getBottomFadingEdgeStrength() {
+ return computeVerticalScrollOffset() + computeVerticalScrollExtent() <
+ computeVerticalScrollRange() ? 1.0f : 0.0f;
+ }
+
+ /**
+ * Returns the strength, or intensity, of the left faded edge. The strength is
+ * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
+ * returns 0.0 or 1.0 but no value in between.
+ *
+ * Subclasses should override this method to provide a smoother fade transition
+ * when scrolling occurs.
+ *
+ * @return the intensity of the left fade as a float between 0.0f and 1.0f
+ */
+ protected float getLeftFadingEdgeStrength() {
+ return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f;
+ }
+
+ /**
+ * Returns the strength, or intensity, of the right faded edge. The strength is
+ * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
+ * returns 0.0 or 1.0 but no value in between.
+ *
+ * Subclasses should override this method to provide a smoother fade transition
+ * when scrolling occurs.
+ *
+ * @return the intensity of the right fade as a float between 0.0f and 1.0f
+ */
+ protected float getRightFadingEdgeStrength() {
+ return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() <
+ computeHorizontalScrollRange() ? 1.0f : 0.0f;
+ }
+
+ /**
+ * <p>Indicate whether the horizontal scrollbar should be drawn or not. The
+ * scrollbar is not drawn by default.</p>
+ *
+ * @return true if the horizontal scrollbar should be painted, false
+ * otherwise
+ *
+ * @see #setHorizontalScrollBarEnabled(boolean)
+ */
+ public boolean isHorizontalScrollBarEnabled() {
+ return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
+ }
+
+ /**
+ * <p>Define whether the horizontal scrollbar should be drawn or not. The
+ * scrollbar is not drawn by default.</p>
+ *
+ * @param horizontalScrollBarEnabled true if the horizontal scrollbar should
+ * be painted
+ *
+ * @see #isHorizontalScrollBarEnabled()
+ */
+ public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) {
+ if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) {
+ mViewFlags ^= SCROLLBARS_HORIZONTAL;
+ recomputePadding();
+ }
+ }
+
+ /**
+ * <p>Indicate whether the vertical scrollbar should be drawn or not. The
+ * scrollbar is not drawn by default.</p>
+ *
+ * @return true if the vertical scrollbar should be painted, false
+ * otherwise
+ *
+ * @see #setVerticalScrollBarEnabled(boolean)
+ */
+ public boolean isVerticalScrollBarEnabled() {
+ return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL;
+ }
+
+ /**
+ * <p>Define whether the vertical scrollbar should be drawn or not. The
+ * scrollbar is not drawn by default.</p>
+ *
+ * @param verticalScrollBarEnabled true if the vertical scrollbar should
+ * be painted
+ *
+ * @see #isVerticalScrollBarEnabled()
+ */
+ public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) {
+ if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) {
+ mViewFlags ^= SCROLLBARS_VERTICAL;
+ recomputePadding();
+ }
+ }
+
+ private void recomputePadding() {
+ setPadding(mPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
+ }
+
+ /**
+ * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or
+ * inset. When inset, they add to the padding of the view. And the scrollbars
+ * can be drawn inside the padding area or on the edge of the view. For example,
+ * if a view has a background drawable and you want to draw the scrollbars
+ * inside the padding specified by the drawable, you can use
+ * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to
+ * appear at the edge of the view, ignoring the padding, then you can use
+ * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p>
+ * @param style the style of the scrollbars. Should be one of
+ * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET,
+ * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
+ * @see #SCROLLBARS_INSIDE_OVERLAY
+ * @see #SCROLLBARS_INSIDE_INSET
+ * @see #SCROLLBARS_OUTSIDE_OVERLAY
+ * @see #SCROLLBARS_OUTSIDE_INSET
+ */
+ public void setScrollBarStyle(int style) {
+ if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) {
+ mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK);
+ recomputePadding();
+ }
+ }
+
+ /**
+ * <p>Returns the current scrollbar style.</p>
+ * @return the current scrollbar style
+ * @see #SCROLLBARS_INSIDE_OVERLAY
+ * @see #SCROLLBARS_INSIDE_INSET
+ * @see #SCROLLBARS_OUTSIDE_OVERLAY
+ * @see #SCROLLBARS_OUTSIDE_INSET
+ */
+ public int getScrollBarStyle() {
+ return mViewFlags & SCROLLBARS_STYLE_MASK;
+ }
+
+ /**
+ * <p>Compute the horizontal range that the horizontal scrollbar
+ * represents.</p>
+ *
+ * <p>The range is expressed in arbitrary units that must be the same as the
+ * units used by {@link #computeHorizontalScrollExtent()} and
+ * {@link #computeHorizontalScrollOffset()}.</p>
+ *
+ * <p>The default range is the drawing width of this view.</p>
+ *
+ * @return the total horizontal range represented by the horizontal
+ * scrollbar
+ *
+ * @see #computeHorizontalScrollExtent()
+ * @see #computeHorizontalScrollOffset()
+ * @see android.widget.ScrollBarDrawable
+ */
+ protected int computeHorizontalScrollRange() {
+ return getWidth();
+ }
+
+ /**
+ * <p>Compute the horizontal offset of the horizontal scrollbar's thumb
+ * within the horizontal range. This value is used to compute the position
+ * of the thumb within the scrollbar's track.</p>
+ *
+ * <p>The range is expressed in arbitrary units that must be the same as the
+ * units used by {@link #computeHorizontalScrollRange()} and
+ * {@link #computeHorizontalScrollExtent()}.</p>
+ *
+ * <p>The default offset is the scroll offset of this view.</p>
+ *
+ * @return the horizontal offset of the scrollbar's thumb
+ *
+ * @see #computeHorizontalScrollRange()
+ * @see #computeHorizontalScrollExtent()
+ * @see android.widget.ScrollBarDrawable
+ */
+ protected int computeHorizontalScrollOffset() {
+ return mScrollX;
+ }
+
+ /**
+ * <p>Compute the horizontal extent of the horizontal scrollbar's thumb
+ * within the horizontal range. This value is used to compute the length
+ * of the thumb within the scrollbar's track.</p>
+ *
+ * <p>The range is expressed in arbitrary units that must be the same as the
+ * units used by {@link #computeHorizontalScrollRange()} and
+ * {@link #computeHorizontalScrollOffset()}.</p>
+ *
+ * <p>The default extent is the drawing width of this view.</p>
+ *
+ * @return the horizontal extent of the scrollbar's thumb
+ *
+ * @see #computeHorizontalScrollRange()
+ * @see #computeHorizontalScrollOffset()
+ * @see android.widget.ScrollBarDrawable
+ */
+ protected int computeHorizontalScrollExtent() {
+ return getWidth();
+ }
+
+ /**
+ * <p>Compute the vertical range that the vertical scrollbar represents.</p>
+ *
+ * <p>The range is expressed in arbitrary units that must be the same as the
+ * units used by {@link #computeVerticalScrollExtent()} and
+ * {@link #computeVerticalScrollOffset()}.</p>
+ *
+ * @return the total vertical range represented by the vertical scrollbar
+ *
+ * <p>The default range is the drawing height of this view.</p>
+ *
+ * @see #computeVerticalScrollExtent()
+ * @see #computeVerticalScrollOffset()
+ * @see android.widget.ScrollBarDrawable
+ */
+ protected int computeVerticalScrollRange() {
+ return getHeight();
+ }
+
+ /**
+ * <p>Compute the vertical offset of the vertical scrollbar's thumb
+ * within the horizontal range. This value is used to compute the position
+ * of the thumb within the scrollbar's track.</p>
+ *
+ * <p>The range is expressed in arbitrary units that must be the same as the
+ * units used by {@link #computeVerticalScrollRange()} and
+ * {@link #computeVerticalScrollExtent()}.</p>
+ *
+ * <p>The default offset is the scroll offset of this view.</p>
+ *
+ * @return the vertical offset of the scrollbar's thumb
+ *
+ * @see #computeVerticalScrollRange()
+ * @see #computeVerticalScrollExtent()
+ * @see android.widget.ScrollBarDrawable
+ */
+ protected int computeVerticalScrollOffset() {
+ return mScrollY;
+ }
+
+ /**
+ * <p>Compute the vertical extent of the horizontal scrollbar's thumb
+ * within the vertical range. This value is used to compute the length
+ * of the thumb within the scrollbar's track.</p>
+ *
+ * <p>The range is expressed in arbitrary units that must be the same as the
+ * units used by {@link #computeHorizontalScrollRange()} and
+ * {@link #computeVerticalScrollOffset()}.</p>
+ *
+ * <p>The default extent is the drawing height of this view.</p>
+ *
+ * @return the vertical extent of the scrollbar's thumb
+ *
+ * @see #computeVerticalScrollRange()
+ * @see #computeVerticalScrollOffset()
+ * @see android.widget.ScrollBarDrawable
+ */
+ protected int computeVerticalScrollExtent() {
+ return getHeight();
+ }
+
+ /**
+ * <p>Request the drawing of the horizontal and the vertical scrollbar. The
+ * scrollbars are painted only if they have been awakened first.</p>
+ *
+ * @param canvas the canvas on which to draw the scrollbars
+ */
+ private void onDrawScrollBars(Canvas canvas) {
+ // scrollbars are drawn only when the animation is running
+ final ScrollabilityCache cache = mScrollCache;
+ if (cache != null) {
+ final int viewFlags = mViewFlags;
+
+ final boolean drawHorizontalScrollBar =
+ (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
+ final boolean drawVerticalScrollBar =
+ (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL
+ && !isVerticalScrollBarHidden();
+
+ if (drawVerticalScrollBar || drawHorizontalScrollBar) {
+ final int width = mRight - mLeft;
+ final int height = mBottom - mTop;
+
+ final ScrollBarDrawable scrollBar = cache.scrollBar;
+ int size = scrollBar.getSize(false);
+ if (size <= 0) {
+ size = cache.scrollBarSize;
+ }
+
+ if (drawHorizontalScrollBar) {
+ onDrawHorizontalScrollBar(canvas, scrollBar, width, height, size);
+ }
+
+ if (drawVerticalScrollBar) {
+ onDrawVerticalScrollBar(canvas, scrollBar, width, height, size);
+ }
+ }
+ }
+ }
+
+ /**
+ * Override this if the vertical scrollbar needs to be hidden in a subclass, like when
+ * FastScroller is visible.
+ * @return whether to temporarily hide the vertical scrollbar
+ * @hide
+ */
+ protected boolean isVerticalScrollBarHidden() {
+ return false;
+ }
+
+ /**
+ * <p>Draw the horizontal scrollbar if
+ * {@link #isHorizontalScrollBarEnabled()} returns true.</p>
+ *
+ * <p>The length of the scrollbar and its thumb is computed according to the
+ * values returned by {@link #computeHorizontalScrollRange()},
+ * {@link #computeHorizontalScrollExtent()} and
+ * {@link #computeHorizontalScrollOffset()}. Refer to
+ * {@link android.widget.ScrollBarDrawable} for more information about how
+ * these values relate to each other.</p>
+ *
+ * @param canvas the canvas on which to draw the scrollbar
+ * @param scrollBar the scrollbar's drawable
+ * @param width the width of the drawing surface
+ * @param height the height of the drawing surface
+ * @param size the size of the scrollbar
+ *
+ * @see #isHorizontalScrollBarEnabled()
+ * @see #computeHorizontalScrollRange()
+ * @see #computeHorizontalScrollExtent()
+ * @see #computeHorizontalScrollOffset()
+ * @see android.widget.ScrollBarDrawable
+ */
+ private void onDrawHorizontalScrollBar(Canvas canvas, ScrollBarDrawable scrollBar, int width,
+ int height, int size) {
+
+ final int viewFlags = mViewFlags;
+ final int scrollX = mScrollX;
+ final int scrollY = mScrollY;
+ final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
+ final int top = scrollY + height - size - (mUserPaddingBottom & inside);
+
+ final int verticalScrollBarGap =
+ (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL ?
+ getVerticalScrollbarWidth() : 0;
+
+ scrollBar.setBounds(scrollX + (mPaddingLeft & inside) + getScrollBarPaddingLeft(), top,
+ scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap, top + size);
+ scrollBar.setParameters(
+ computeHorizontalScrollRange(),
+ computeHorizontalScrollOffset(),
+ computeHorizontalScrollExtent(), false);
+ scrollBar.draw(canvas);
+ }
+
+ /**
+ * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()}
+ * returns true.</p>
+ *
+ * <p>The length of the scrollbar and its thumb is computed according to the
+ * values returned by {@link #computeVerticalScrollRange()},
+ * {@link #computeVerticalScrollExtent()} and
+ * {@link #computeVerticalScrollOffset()}. Refer to
+ * {@link android.widget.ScrollBarDrawable} for more information about how
+ * these values relate to each other.</p>
+ *
+ * @param canvas the canvas on which to draw the scrollbar
+ * @param scrollBar the scrollbar's drawable
+ * @param width the width of the drawing surface
+ * @param height the height of the drawing surface
+ * @param size the size of the scrollbar
+ *
+ * @see #isVerticalScrollBarEnabled()
+ * @see #computeVerticalScrollRange()
+ * @see #computeVerticalScrollExtent()
+ * @see #computeVerticalScrollOffset()
+ * @see android.widget.ScrollBarDrawable
+ */
+ private void onDrawVerticalScrollBar(Canvas canvas, ScrollBarDrawable scrollBar, int width,
+ int height, int size) {
+
+ final int scrollX = mScrollX;
+ final int scrollY = mScrollY;
+ final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
+ // TODO: Deal with RTL languages to position scrollbar on left
+ final int left = scrollX + width - size - (mUserPaddingRight & inside);
+
+ scrollBar.setBounds(left, scrollY + (mPaddingTop & inside),
+ left + size, scrollY + height - (mUserPaddingBottom & inside));
+ scrollBar.setParameters(
+ computeVerticalScrollRange(),
+ computeVerticalScrollOffset(),
+ computeVerticalScrollExtent(), true);
+ scrollBar.draw(canvas);
+ }
+
+ /**
+ * Implement this to do your drawing.
+ *
+ * @param canvas the canvas on which the background will be drawn
+ */
+ protected void onDraw(Canvas canvas) {
+ }
+
+ /*
+ * Caller is responsible for calling requestLayout if necessary.
+ * (This allows addViewInLayout to not request a new layout.)
+ */
+ void assignParent(ViewParent parent) {
+ if (mParent == null) {
+ mParent = parent;
+ } else if (parent == null) {
+ mParent = null;
+ } else {
+ throw new RuntimeException("view " + this + " being added, but"
+ + " it already has a parent");
+ }
+ }
+
+ /**
+ * This is called when the view is attached to a window. At this point it
+ * has a Surface and will start drawing. Note that this function is
+ * guaranteed to be called before {@link #onDraw}, however it may be called
+ * any time before the first onDraw -- including before or after
+ * {@link #onMeasure}.
+ *
+ * @see #onDetachedFromWindow()
+ */
+ protected void onAttachedToWindow() {
+ if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) {
+ mParent.requestTransparentRegion(this);
+ }
+ }
+
+ /**
+ * This is called when the view is detached from a window. At this point it
+ * no longer has a surface for drawing.
+ *
+ * @see #onAttachedToWindow()
+ */
+ protected void onDetachedFromWindow() {
+ if (mPendingCheckForLongPress != null) {
+ removeCallbacks(mPendingCheckForLongPress);
+ }
+ destroyDrawingCache();
+ }
+
+ /**
+ * @return The number of times this view has been attached to a window
+ */
+ protected int getWindowAttachCount() {
+ return mWindowAttachCount;
+ }
+
+ /**
+ * Retrieve a unique token identifying the window this view is attached to.
+ * @return Return the window's token for use in
+ * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}.
+ */
+ public IBinder getWindowToken() {
+ return mAttachInfo != null ? mAttachInfo.mWindowToken : null;
+ }
+
+ /**
+ * Retrieve a unique token identifying the top-level "real" window of
+ * the window that this view is attached to. That is, this is like
+ * {@link #getWindowToken}, except if the window this view in is a panel
+ * window (attached to another containing window), then the token of
+ * the containing window is returned instead.
+ *
+ * @return Returns the associated window token, either
+ * {@link #getWindowToken()} or the containing window's token.
+ */
+ public IBinder getApplicationWindowToken() {
+ AttachInfo ai = mAttachInfo;
+ if (ai != null) {
+ IBinder appWindowToken = ai.mPanelParentWindowToken;
+ if (appWindowToken == null) {
+ appWindowToken = ai.mWindowToken;
+ }
+ return appWindowToken;
+ }
+ return null;
+ }
+
+ /**
+ * Retrieve private session object this view hierarchy is using to
+ * communicate with the window manager.
+ * @return the session object to communicate with the window manager
+ */
+ /*package*/ IWindowSession getWindowSession() {
+ return mAttachInfo != null ? mAttachInfo.mSession : null;
+ }
+
+ /**
+ * @param info the {@link android.view.View.AttachInfo} to associated with
+ * this view
+ */
+ void dispatchAttachedToWindow(AttachInfo info, int visibility) {
+ //System.out.println("Attached! " + this);
+ mAttachInfo = info;
+ mWindowAttachCount++;
+ if (mFloatingTreeObserver != null) {
+ info.mTreeObserver.merge(mFloatingTreeObserver);
+ mFloatingTreeObserver = null;
+ }
+ if ((mPrivateFlags&SCROLL_CONTAINER) != 0) {
+ mAttachInfo.mScrollContainers.add(this);
+ mPrivateFlags |= SCROLL_CONTAINER_ADDED;
+ }
+ performCollectViewAttributes(visibility);
+ onAttachedToWindow();
+ int vis = info.mWindowVisibility;
+ if (vis != GONE) {
+ onWindowVisibilityChanged(vis);
+ }
+ }
+
+ void dispatchDetachedFromWindow() {
+ //System.out.println("Detached! " + this);
+ AttachInfo info = mAttachInfo;
+ if (info != null) {
+ int vis = info.mWindowVisibility;
+ if (vis != GONE) {
+ onWindowVisibilityChanged(GONE);
+ }
+ }
+
+ onDetachedFromWindow();
+ if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) {
+ mAttachInfo.mScrollContainers.remove(this);
+ mPrivateFlags &= ~SCROLL_CONTAINER_ADDED;
+ }
+ mAttachInfo = null;
+ }
+
+ /**
+ * Store this view hierarchy's frozen state into the given container.
+ *
+ * @param container The SparseArray in which to save the view's state.
+ *
+ * @see #restoreHierarchyState
+ * @see #dispatchSaveInstanceState
+ * @see #onSaveInstanceState
+ */
+ public void saveHierarchyState(SparseArray<Parcelable> container) {
+ dispatchSaveInstanceState(container);
+ }
+
+ /**
+ * Called by {@link #saveHierarchyState} to store the state for this view and its children.
+ * May be overridden to modify how freezing happens to a view's children; for example, some
+ * views may want to not store state for their children.
+ *
+ * @param container The SparseArray in which to save the view's state.
+ *
+ * @see #dispatchRestoreInstanceState
+ * @see #saveHierarchyState
+ * @see #onSaveInstanceState
+ */
+ protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
+ if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) {
+ mPrivateFlags &= ~SAVE_STATE_CALLED;
+ Parcelable state = onSaveInstanceState();
+ if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) {
+ throw new IllegalStateException(
+ "Derived class did not call super.onSaveInstanceState()");
+ }
+ if (state != null) {
+ // Log.i("View", "Freezing #" + Integer.toHexString(mID)
+ // + ": " + state);
+ container.put(mID, state);
+ }
+ }
+ }
+
+ /**
+ * Hook allowing a view to generate a representation of its internal state
+ * that can later be used to create a new instance with that same state.
+ * This state should only contain information that is not persistent or can
+ * not be reconstructed later. For example, you will never store your
+ * current position on screen because that will be computed again when a
+ * new instance of the view is placed in its view hierarchy.
+ * <p>
+ * Some examples of things you may store here: the current cursor position
+ * in a text view (but usually not the text itself since that is stored in a
+ * content provider or other persistent storage), the currently selected
+ * item in a list view.
+ *
+ * @return Returns a Parcelable object containing the view's current dynamic
+ * state, or null if there is nothing interesting to save. The
+ * default implementation returns null.
+ * @see #onRestoreInstanceState
+ * @see #saveHierarchyState
+ * @see #dispatchSaveInstanceState
+ * @see #setSaveEnabled(boolean)
+ */
+ protected Parcelable onSaveInstanceState() {
+ mPrivateFlags |= SAVE_STATE_CALLED;
+ return BaseSavedState.EMPTY_STATE;
+ }
+
+ /**
+ * Restore this view hierarchy's frozen state from the given container.
+ *
+ * @param container The SparseArray which holds previously frozen states.
+ *
+ * @see #saveHierarchyState
+ * @see #dispatchRestoreInstanceState
+ * @see #onRestoreInstanceState
+ */
+ public void restoreHierarchyState(SparseArray<Parcelable> container) {
+ dispatchRestoreInstanceState(container);
+ }
+
+ /**
+ * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its
+ * children. May be overridden to modify how restoreing happens to a view's children; for
+ * example, some views may want to not store state for their children.
+ *
+ * @param container The SparseArray which holds previously saved state.
+ *
+ * @see #dispatchSaveInstanceState
+ * @see #restoreHierarchyState
+ * @see #onRestoreInstanceState
+ */
+ protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
+ if (mID != NO_ID) {
+ Parcelable state = container.get(mID);
+ if (state != null) {
+ // Log.i("View", "Restoreing #" + Integer.toHexString(mID)
+ // + ": " + state);
+ mPrivateFlags &= ~SAVE_STATE_CALLED;
+ onRestoreInstanceState(state);
+ if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) {
+ throw new IllegalStateException(
+ "Derived class did not call super.onRestoreInstanceState()");
+ }
+ }
+ }
+ }
+
+ /**
+ * Hook allowing a view to re-apply a representation of its internal state that had previously
+ * been generated by {@link #onSaveInstanceState}. This function will never be called with a
+ * null state.
+ *
+ * @param state The frozen state that had previously been returned by
+ * {@link #onSaveInstanceState}.
+ *
+ * @see #onSaveInstanceState
+ * @see #restoreHierarchyState
+ * @see #dispatchRestoreInstanceState
+ */
+ protected void onRestoreInstanceState(Parcelable state) {
+ mPrivateFlags |= SAVE_STATE_CALLED;
+ if (state != BaseSavedState.EMPTY_STATE && state != null) {
+ throw new IllegalArgumentException("Wrong state class -- expecting View State");
+ }
+ }
+
+ /**
+ * <p>Return the time at which the drawing of the view hierarchy started.</p>
+ *
+ * @return the drawing start time in milliseconds
+ */
+ public long getDrawingTime() {
+ return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0;
+ }
+
+ /**
+ * <p>Enables or disables the duplication of the parent's state into this view. When
+ * duplication is enabled, this view gets its drawable state from its parent rather
+ * than from its own internal properties.</p>
+ *
+ * <p>Note: in the current implementation, setting this property to true after the
+ * view was added to a ViewGroup might have no effect at all. This property should
+ * always be used from XML or set to true before adding this view to a ViewGroup.</p>
+ *
+ * <p>Note: if this view's parent addStateFromChildren property is enabled and this
+ * property is enabled, an exception will be thrown.</p>
+ *
+ * @param enabled True to enable duplication of the parent's drawable state, false
+ * to disable it.
+ *
+ * @see #getDrawableState()
+ * @see #isDuplicateParentStateEnabled()
+ */
+ public void setDuplicateParentStateEnabled(boolean enabled) {
+ setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE);
+ }
+
+ /**
+ * <p>Indicates whether this duplicates its drawable state from its parent.</p>
+ *
+ * @return True if this view's drawable state is duplicated from the parent,
+ * false otherwise
+ *
+ * @see #getDrawableState()
+ * @see #setDuplicateParentStateEnabled(boolean)
+ */
+ public boolean isDuplicateParentStateEnabled() {
+ return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE;
+ }
+
+ /**
+ * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call
+ * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a
+ * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when
+ * the cache is enabled. To benefit from the cache, you must request the drawing cache by
+ * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not
+ * null.</p>
+ *
+ * @param enabled true to enable the drawing cache, false otherwise
+ *
+ * @see #isDrawingCacheEnabled()
+ * @see #getDrawingCache()
+ * @see #buildDrawingCache()
+ */
+ public void setDrawingCacheEnabled(boolean enabled) {
+ setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED);
+ }
+
+ /**
+ * <p>Indicates whether the drawing cache is enabled for this view.</p>
+ *
+ * @return true if the drawing cache is enabled
+ *
+ * @see #setDrawingCacheEnabled(boolean)
+ * @see #getDrawingCache()
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isDrawingCacheEnabled() {
+ return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED;
+ }
+
+ /**
+ * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap
+ * is null when caching is disabled. If caching is enabled and the cache is not ready,
+ * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not
+ * draw from the cache when the cache is enabled. To benefit from the cache, you must
+ * request the drawing cache by calling this method and draw it on screen if the
+ * returned bitmap is not null.</p>
+ *
+ * @return a bitmap representing this view or null if cache is disabled
+ *
+ * @see #setDrawingCacheEnabled(boolean)
+ * @see #isDrawingCacheEnabled()
+ * @see #buildDrawingCache()
+ * @see #destroyDrawingCache()
+ */
+ public Bitmap getDrawingCache() {
+ if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) {
+ return null;
+ }
+ if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) {
+ buildDrawingCache();
+ }
+ return mDrawingCache == null ? null : mDrawingCache.get();
+ }
+
+ /**
+ * <p>Frees the resources used by the drawing cache. If you call
+ * {@link #buildDrawingCache()} manually without calling
+ * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
+ * should cleanup the cache with this method afterwards.</p>
+ *
+ * @see #setDrawingCacheEnabled(boolean)
+ * @see #buildDrawingCache()
+ * @see #getDrawingCache()
+ */
+ public void destroyDrawingCache() {
+ if (mDrawingCache != null) {
+ final Bitmap bitmap = mDrawingCache.get();
+ if (bitmap != null) bitmap.recycle();
+ mDrawingCache = null;
+ }
+ }
+
+ /**
+ * Setting a solid background color for the drawing cache's bitmaps will improve
+ * perfromance and memory usage. Note, though that this should only be used if this
+ * view will always be drawn on top of a solid color.
+ *
+ * @param color The background color to use for the drawing cache's bitmap
+ *
+ * @see #setDrawingCacheEnabled(boolean)
+ * @see #buildDrawingCache()
+ * @see #getDrawingCache()
+ */
+ public void setDrawingCacheBackgroundColor(int color) {
+ mDrawingCacheBackgroundColor = color;
+ }
+
+ /**
+ * @see #setDrawingCacheBackgroundColor(int)
+ *
+ * @return The background color to used for the drawing cache's bitmap
+ */
+ public int getDrawingCacheBackgroundColor() {
+ return mDrawingCacheBackgroundColor;
+ }
+
+ /**
+ * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p>
+ *
+ * <p>If you call {@link #buildDrawingCache()} manually without calling
+ * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
+ * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p>
+ *
+ * @see #getDrawingCache()
+ * @see #destroyDrawingCache()
+ */
+ public void buildDrawingCache() {
+ if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mDrawingCache == null ||
+ mDrawingCache.get() == null) {
+
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE);
+ }
+ if (ViewRoot.PROFILE_DRAWING) {
+ EventLog.writeEvent(60002, hashCode());
+ }
+
+ final int width = mRight - mLeft;
+ final int height = mBottom - mTop;
+
+ final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor;
+ final boolean opaque = drawingCacheBackgroundColor != 0 ||
+ (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE);
+
+ if (width <= 0 || height <= 0 ||
+ (width * height * (opaque ? 2 : 4) >= // Projected bitmap size in bytes
+ ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) {
+ destroyDrawingCache();
+ return;
+ }
+
+ boolean clear = true;
+ Bitmap bitmap = mDrawingCache == null ? null : mDrawingCache.get();
+
+ if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
+
+ Bitmap.Config quality;
+ if (!opaque) {
+ switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
+ case DRAWING_CACHE_QUALITY_AUTO:
+ quality = Bitmap.Config.ARGB_8888;
+ break;
+ case DRAWING_CACHE_QUALITY_LOW:
+ quality = Bitmap.Config.ARGB_4444;
+ break;
+ case DRAWING_CACHE_QUALITY_HIGH:
+ quality = Bitmap.Config.ARGB_8888;
+ break;
+ default:
+ quality = Bitmap.Config.ARGB_8888;
+ break;
+ }
+ } else {
+ quality = Bitmap.Config.RGB_565;
+ }
+
+ // Try to cleanup memory
+ if (bitmap != null) bitmap.recycle();
+
+ try {
+ bitmap = Bitmap.createBitmap(width, height, quality);
+ mDrawingCache = new SoftReference<Bitmap>(bitmap);
+ } catch (OutOfMemoryError e) {
+ // If there is not enough memory to create the bitmap cache, just
+ // ignore the issue as bitmap caches are not required to draw the
+ // view hierarchy
+ mDrawingCache = null;
+ return;
+ }
+
+ clear = drawingCacheBackgroundColor != 0;
+ }
+
+ Canvas canvas;
+ final AttachInfo attachInfo = mAttachInfo;
+ if (attachInfo != null) {
+ canvas = attachInfo.mCanvas;
+ if (canvas == null) {
+ canvas = new Canvas();
+ }
+ canvas.setBitmap(bitmap);
+ // Temporarily clobber the cached Canvas in case one of our children
+ // is also using a drawing cache. Without this, the children would
+ // steal the canvas by attaching their own bitmap to it and bad, bad
+ // thing would happen (invisible views, corrupted drawings, etc.)
+ attachInfo.mCanvas = null;
+ } else {
+ // This case should hopefully never or seldom happen
+ canvas = new Canvas(bitmap);
+ }
+
+ if (clear) {
+ bitmap.eraseColor(drawingCacheBackgroundColor);
+ }
+
+ computeScroll();
+ final int restoreCount = canvas.save();
+ canvas.translate(-mScrollX, -mScrollY);
+
+ mPrivateFlags |= DRAWN;
+
+ // Fast path for layouts with no backgrounds
+ if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW);
+ }
+ dispatchDraw(canvas);
+ } else {
+ draw(canvas);
+ }
+
+ canvas.restoreToCount(restoreCount);
+
+ if (attachInfo != null) {
+ // Restore the cached Canvas for our siblings
+ attachInfo.mCanvas = canvas;
+ }
+ mPrivateFlags |= DRAWING_CACHE_VALID;
+ }
+ }
+
+ /**
+ * Indicates whether this View is currently in edit mode. A View is usually
+ * in edit mode when displayed within a developer tool. For instance, if
+ * this View is being drawn by a visual user interface builder, this method
+ * should return true.
+ *
+ * Subclasses should check the return value of this method to provide
+ * different behaviors if their normal behavior might interfere with the
+ * host environment. For instance: the class spawns a thread in its
+ * constructor, the drawing code relies on device-specific features, etc.
+ *
+ * This method is usually checked in the drawing code of custom widgets.
+ *
+ * @return True if this View is in edit mode, false otherwise.
+ */
+ public boolean isInEditMode() {
+ return false;
+ }
+
+ /**
+ * If the View draws content inside its padding and enables fading edges,
+ * it needs to support padding offsets. Padding offsets are added to the
+ * fading edges to extend the length of the fade so that it covers pixels
+ * drawn inside the padding.
+ *
+ * Subclasses of this class should override this method if they need
+ * to draw content inside the padding.
+ *
+ * @return True if padding offset must be applied, false otherwise.
+ *
+ * @see #getLeftPaddingOffset()
+ * @see #getRightPaddingOffset()
+ * @see #getTopPaddingOffset()
+ * @see #getBottomPaddingOffset()
+ *
+ * @since CURRENT
+ */
+ protected boolean isPaddingOffsetRequired() {
+ return false;
+ }
+
+ /**
+ * Amount by which to extend the left fading region. Called only when
+ * {@link #isPaddingOffsetRequired()} returns true.
+ *
+ * @return The left padding offset in pixels.
+ *
+ * @see #isPaddingOffsetRequired()
+ *
+ * @since CURRENT
+ */
+ protected int getLeftPaddingOffset() {
+ return 0;
+ }
+
+ /**
+ * Amount by which to extend the right fading region. Called only when
+ * {@link #isPaddingOffsetRequired()} returns true.
+ *
+ * @return The right padding offset in pixels.
+ *
+ * @see #isPaddingOffsetRequired()
+ *
+ * @since CURRENT
+ */
+ protected int getRightPaddingOffset() {
+ return 0;
+ }
+
+ /**
+ * Amount by which to extend the top fading region. Called only when
+ * {@link #isPaddingOffsetRequired()} returns true.
+ *
+ * @return The top padding offset in pixels.
+ *
+ * @see #isPaddingOffsetRequired()
+ *
+ * @since CURRENT
+ */
+ protected int getTopPaddingOffset() {
+ return 0;
+ }
+
+ /**
+ * Amount by which to extend the bottom fading region. Called only when
+ * {@link #isPaddingOffsetRequired()} returns true.
+ *
+ * @return The bottom padding offset in pixels.
+ *
+ * @see #isPaddingOffsetRequired()
+ *
+ * @since CURRENT
+ */
+ protected int getBottomPaddingOffset() {
+ return 0;
+ }
+
+ /**
+ * Manually render this view (and all of its children) to the given Canvas.
+ * The view must have already done a full layout before this function is
+ * called. When implementing a view, do not override this method; instead,
+ * you should implement {@link #onDraw}.
+ *
+ * @param canvas The Canvas to which the View is rendered.
+ */
+ public void draw(Canvas canvas) {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW);
+ }
+
+ mPrivateFlags |= DRAWN;
+
+ /*
+ * Draw traversal performs several drawing steps which must be executed
+ * in the appropriate order:
+ *
+ * 1. Draw the background
+ * 2. If necessary, save the canvas' layers to prepare for fading
+ * 3. Draw view's content
+ * 4. Draw children
+ * 5. If necessary, draw the fading edges and restore layers
+ * 6. Draw decorations (scrollbars for instance)
+ */
+
+ // Step 1, draw the background, if needed
+ int saveCount;
+
+ final Drawable background = mBGDrawable;
+ if (background != null) {
+ final int scrollX = mScrollX;
+ final int scrollY = mScrollY;
+
+ if (mBackgroundSizeChanged) {
+ background.setBounds(0, 0, mRight - mLeft, mBottom - mTop);
+ mBackgroundSizeChanged = false;
+ }
+
+ if ((scrollX | scrollY) == 0) {
+ background.draw(canvas);
+ } else {
+ canvas.translate(scrollX, scrollY);
+ background.draw(canvas);
+ canvas.translate(-scrollX, -scrollY);
+ }
+ }
+
+ // skip step 2 & 5 if possible (common case)
+ final int viewFlags = mViewFlags;
+ boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0;
+ boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0;
+ if (!verticalEdges && !horizontalEdges) {
+ // Step 3, draw the content
+ onDraw(canvas);
+
+ // Step 4, draw the children
+ dispatchDraw(canvas);
+
+ // Step 6, draw decorations (scrollbars)
+ onDrawScrollBars(canvas);
+
+ // we're done...
+ return;
+ }
+
+ /*
+ * Here we do the full fledged routine...
+ * (this is an uncommon case where speed matters less,
+ * this is why we repeat some of the tests that have been
+ * done above)
+ */
+
+ boolean drawTop = false;
+ boolean drawBottom = false;
+ boolean drawLeft = false;
+ boolean drawRight = false;
+
+ float topFadeStrength = 0.0f;
+ float bottomFadeStrength = 0.0f;
+ float leftFadeStrength = 0.0f;
+ float rightFadeStrength = 0.0f;
+
+ // Step 2, save the canvas' layers
+ int paddingLeft = mPaddingLeft;
+ int paddingTop = mPaddingTop;
+
+ final boolean offsetRequired = isPaddingOffsetRequired();
+ if (offsetRequired) {
+ paddingLeft += getLeftPaddingOffset();
+ paddingTop += getTopPaddingOffset();
+ }
+
+ int left = mScrollX + paddingLeft;
+ int right = left + mRight - mLeft - mPaddingRight - paddingLeft;
+ int top = mScrollY + paddingTop;
+ int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop;
+
+ if (offsetRequired) {
+ right += getRightPaddingOffset();
+ bottom += getBottomPaddingOffset();
+ }
+
+ final ScrollabilityCache scrollabilityCache = mScrollCache;
+ int length = scrollabilityCache.fadingEdgeLength;
+
+ // clip the fade length if top and bottom fades overlap
+ // overlapping fades produce odd-looking artifacts
+ if (verticalEdges && (top + length > bottom - length)) {
+ length = (bottom - top) / 2;
+ }
+
+ // also clip horizontal fades if necessary
+ if (horizontalEdges && (left + length > right - length)) {
+ length = (right - left) / 2;
+ }
+
+ if (verticalEdges) {
+ topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength()));
+ drawTop = topFadeStrength >= 0.0f;
+ bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength()));
+ drawBottom = bottomFadeStrength >= 0.0f;
+ }
+
+ if (horizontalEdges) {
+ leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength()));
+ drawLeft = leftFadeStrength >= 0.0f;
+ rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength()));
+ drawRight = rightFadeStrength >= 0.0f;
+ }
+
+ saveCount = canvas.getSaveCount();
+
+ int solidColor = getSolidColor();
+ if (solidColor == 0) {
+ final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG;
+
+ if (drawTop) {
+ canvas.saveLayer(left, top, right, top + length, null, flags);
+ }
+
+ if (drawBottom) {
+ canvas.saveLayer(left, bottom - length, right, bottom, null, flags);
+ }
+
+ if (drawLeft) {
+ canvas.saveLayer(left, top, left + length, bottom, null, flags);
+ }
+
+ if (drawRight) {
+ canvas.saveLayer(right - length, top, right, bottom, null, flags);
+ }
+ } else {
+ scrollabilityCache.setFadeColor(solidColor);
+ }
+
+ // Step 3, draw the content
+ onDraw(canvas);
+
+ // Step 4, draw the children
+ dispatchDraw(canvas);
+
+ // Step 5, draw the fade effect and restore layers
+ final Paint p = scrollabilityCache.paint;
+ final Matrix matrix = scrollabilityCache.matrix;
+ final Shader fade = scrollabilityCache.shader;
+ final float fadeHeight = scrollabilityCache.fadingEdgeLength;
+
+ if (drawTop) {
+ matrix.setScale(1, fadeHeight * topFadeStrength);
+ matrix.postTranslate(left, top);
+ fade.setLocalMatrix(matrix);
+ canvas.drawRect(left, top, right, top + length, p);
+ }
+
+ if (drawBottom) {
+ matrix.setScale(1, fadeHeight * bottomFadeStrength);
+ matrix.postRotate(180);
+ matrix.postTranslate(left, bottom);
+ fade.setLocalMatrix(matrix);
+ canvas.drawRect(left, bottom - length, right, bottom, p);
+ }
+
+ if (drawLeft) {
+ matrix.setScale(1, fadeHeight * leftFadeStrength);
+ matrix.postRotate(-90);
+ matrix.postTranslate(left, top);
+ fade.setLocalMatrix(matrix);
+ canvas.drawRect(left, top, left + length, bottom, p);
+ }
+
+ if (drawRight) {
+ matrix.setScale(1, fadeHeight * rightFadeStrength);
+ matrix.postRotate(90);
+ matrix.postTranslate(right, top);
+ fade.setLocalMatrix(matrix);
+ canvas.drawRect(right - length, top, right, bottom, p);
+ }
+
+ canvas.restoreToCount(saveCount);
+
+ // Step 6, draw decorations (scrollbars)
+ onDrawScrollBars(canvas);
+ }
+
+ /**
+ * Override this if your view is known to always be drawn on top of a solid color background,
+ * and needs to draw fading edges. Returning a non-zero color enables the view system to
+ * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha
+ * should be set to 0xFF.
+ *
+ * @see #setVerticalFadingEdgeEnabled
+ * @see #setHorizontalFadingEdgeEnabled
+ *
+ * @return The known solid color background for this view, or 0 if the color may vary
+ */
+ public int getSolidColor() {
+ return 0;
+ }
+
+ /**
+ * Build a human readable string representation of the specified view flags.
+ *
+ * @param flags the view flags to convert to a string
+ * @return a String representing the supplied flags
+ */
+ private static String printFlags(int flags) {
+ String output = "";
+ int numFlags = 0;
+ if ((flags & FOCUSABLE_MASK) == FOCUSABLE) {
+ output += "TAKES_FOCUS";
+ numFlags++;
+ }
+
+ switch (flags & VISIBILITY_MASK) {
+ case INVISIBLE:
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "INVISIBLE";
+ // USELESS HERE numFlags++;
+ break;
+ case GONE:
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "GONE";
+ // USELESS HERE numFlags++;
+ break;
+ default:
+ break;
+ }
+ return output;
+ }
+
+ /**
+ * Build a human readable string representation of the specified private
+ * view flags.
+ *
+ * @param privateFlags the private view flags to convert to a string
+ * @return a String representing the supplied flags
+ */
+ private static String printPrivateFlags(int privateFlags) {
+ String output = "";
+ int numFlags = 0;
+
+ if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) {
+ output += "WANTS_FOCUS";
+ numFlags++;
+ }
+
+ if ((privateFlags & FOCUSED) == FOCUSED) {
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "FOCUSED";
+ numFlags++;
+ }
+
+ if ((privateFlags & SELECTED) == SELECTED) {
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "SELECTED";
+ numFlags++;
+ }
+
+ if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) {
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "IS_ROOT_NAMESPACE";
+ numFlags++;
+ }
+
+ if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) {
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "HAS_BOUNDS";
+ numFlags++;
+ }
+
+ if ((privateFlags & DRAWN) == DRAWN) {
+ if (numFlags > 0) {
+ output += " ";
+ }
+ output += "DRAWN";
+ // USELESS HERE numFlags++;
+ }
+ return output;
+ }
+
+ /**
+ * <p>Indicates whether or not this view's layout will be requested during
+ * the next hierarchy layout pass.</p>
+ *
+ * @return true if the layout will be forced during next layout pass
+ */
+ public boolean isLayoutRequested() {
+ return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT;
+ }
+
+ /**
+ * Assign a size and position to a view and all of its
+ * descendants
+ *
+ * <p>This is the second phase of the layout mechanism.
+ * (The first is measuring). In this phase, each parent calls
+ * layout on all of its children to position them.
+ * This is typically done using the child measurements
+ * that were stored in the measure pass().
+ *
+ * Derived classes with children should override
+ * onLayout. In that method, they should
+ * call layout on each of their their children.
+ *
+ * @param l Left position, relative to parent
+ * @param t Top position, relative to parent
+ * @param r Right position, relative to parent
+ * @param b Bottom position, relative to parent
+ */
+ public final void layout(int l, int t, int r, int b) {
+ boolean changed = setFrame(l, t, r, b);
+ if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT);
+ }
+
+ onLayout(changed, l, t, r, b);
+ mPrivateFlags &= ~LAYOUT_REQUIRED;
+ }
+ mPrivateFlags &= ~FORCE_LAYOUT;
+ }
+
+ /**
+ * Called from layout when this view should
+ * assign a size and position to each of its children.
+ *
+ * Derived classes with children should override
+ * this method and call layout on each of
+ * their their children.
+ * @param changed This is a new size or position for this view
+ * @param left Left position, relative to parent
+ * @param top Top position, relative to parent
+ * @param right Right position, relative to parent
+ * @param bottom Bottom position, relative to parent
+ */
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ }
+
+ /**
+ * Assign a size and position to this view.
+ *
+ * This is called from layout.
+ *
+ * @param left Left position, relative to parent
+ * @param top Top position, relative to parent
+ * @param right Right position, relative to parent
+ * @param bottom Bottom position, relative to parent
+ * @return true if the new size and position are different than the
+ * previous ones
+ * {@hide}
+ */
+ protected boolean setFrame(int left, int top, int right, int bottom) {
+ boolean changed = false;
+
+ if (DBG) {
+ System.out.println(this + " View.setFrame(" + left + "," + top + ","
+ + right + "," + bottom + ")");
+ }
+
+ if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
+ changed = true;
+
+ // Remember our drawn bit
+ int drawn = mPrivateFlags & DRAWN;
+
+ // Invalidate our old position
+ invalidate();
+
+
+ int oldWidth = mRight - mLeft;
+ int oldHeight = mBottom - mTop;
+
+ mLeft = left;
+ mTop = top;
+ mRight = right;
+ mBottom = bottom;
+
+ mPrivateFlags |= HAS_BOUNDS;
+
+ int newWidth = right - left;
+ int newHeight = bottom - top;
+
+ if (newWidth != oldWidth || newHeight != oldHeight) {
+ onSizeChanged(newWidth, newHeight, oldWidth, oldHeight);
+ }
+
+ if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+ // If we are visible, force the DRAWN bit to on so that
+ // this invalidate will go through (at least to our parent).
+ // This is because someone may have invalidated this view
+ // before this call to setFrame came in, therby clearing
+ // the DRAWN bit.
+ mPrivateFlags |= DRAWN;
+ invalidate();
+ }
+
+ // Reset drawn bit to original value (invalidate turns it off)
+ mPrivateFlags |= drawn;
+
+ mBackgroundSizeChanged = true;
+ }
+ return changed;
+ }
+
+ /**
+ * Finalize inflating a view from XML. This is called as the last phase
+ * of inflation, after all child views have been added.
+ *
+ * <p>Even if the subclass overrides onFinishInflate, they should always be
+ * sure to call the super method, so that we get called.
+ */
+ protected void onFinishInflate() {
+ }
+
+ /**
+ * Returns the resources associated with this view.
+ *
+ * @return Resources object.
+ */
+ public Resources getResources() {
+ return mResources;
+ }
+
+ /**
+ * Invalidates the specified Drawable.
+ *
+ * @param drawable the drawable to invalidate
+ */
+ public void invalidateDrawable(Drawable drawable) {
+ if (verifyDrawable(drawable)) {
+ final Rect dirty = drawable.getBounds();
+ final int scrollX = mScrollX;
+ final int scrollY = mScrollY;
+
+ invalidate(dirty.left + scrollX, dirty.top + scrollY,
+ dirty.right + scrollX, dirty.bottom + scrollY);
+ }
+ }
+
+ /**
+ * Schedules an action on a drawable to occur at a specified time.
+ *
+ * @param who the recipient of the action
+ * @param what the action to run on the drawable
+ * @param when the time at which the action must occur. Uses the
+ * {@link SystemClock#uptimeMillis} timebase.
+ */
+ public void scheduleDrawable(Drawable who, Runnable what, long when) {
+ if (verifyDrawable(who) && what != null && mAttachInfo != null) {
+ mAttachInfo.mHandler.postAtTime(what, who, when);
+ }
+ }
+
+ /**
+ * Cancels a scheduled action on a drawable.
+ *
+ * @param who the recipient of the action
+ * @param what the action to cancel
+ */
+ public void unscheduleDrawable(Drawable who, Runnable what) {
+ if (verifyDrawable(who) && what != null && mAttachInfo != null) {
+ mAttachInfo.mHandler.removeCallbacks(what, who);
+ }
+ }
+
+ /**
+ * Unschedule any events associated with the given Drawable. This can be
+ * used when selecting a new Drawable into a view, so that the previous
+ * one is completely unscheduled.
+ *
+ * @param who The Drawable to unschedule.
+ *
+ * @see #drawableStateChanged
+ */
+ public void unscheduleDrawable(Drawable who) {
+ if (mAttachInfo != null) {
+ mAttachInfo.mHandler.removeCallbacksAndMessages(who);
+ }
+ }
+
+ /**
+ * If your view subclass is displaying its own Drawable objects, it should
+ * override this function and return true for any Drawable it is
+ * displaying. This allows animations for those drawables to be
+ * scheduled.
+ *
+ * <p>Be sure to call through to the super class when overriding this
+ * function.
+ *
+ * @param who The Drawable to verify. Return true if it is one you are
+ * displaying, else return the result of calling through to the
+ * super class.
+ *
+ * @return boolean If true than the Drawable is being displayed in the
+ * view; else false and it is not allowed to animate.
+ *
+ * @see #unscheduleDrawable
+ * @see #drawableStateChanged
+ */
+ protected boolean verifyDrawable(Drawable who) {
+ return who == mBGDrawable;
+ }
+
+ /**
+ * This function is called whenever the state of the view changes in such
+ * a way that it impacts the state of drawables being shown.
+ *
+ * <p>Be sure to call through to the superclass when overriding this
+ * function.
+ *
+ * @see Drawable#setState
+ */
+ protected void drawableStateChanged() {
+ Drawable d = mBGDrawable;
+ if (d != null && d.isStateful()) {
+ d.setState(getDrawableState());
+ }
+ }
+
+ /**
+ * Call this to force a view to update its drawable state. This will cause
+ * drawableStateChanged to be called on this view. Views that are interested
+ * in the new state should call getDrawableState.
+ *
+ * @see #drawableStateChanged
+ * @see #getDrawableState
+ */
+ public void refreshDrawableState() {
+ mPrivateFlags |= DRAWABLE_STATE_DIRTY;
+ drawableStateChanged();
+
+ ViewParent parent = mParent;
+ if (parent != null) {
+ parent.childDrawableStateChanged(this);
+ }
+ }
+
+ /**
+ * Return an array of resource IDs of the drawable states representing the
+ * current state of the view.
+ *
+ * @return The current drawable state
+ *
+ * @see Drawable#setState
+ * @see #drawableStateChanged
+ * @see #onCreateDrawableState
+ */
+ public final int[] getDrawableState() {
+ if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) {
+ return mDrawableState;
+ } else {
+ mDrawableState = onCreateDrawableState(0);
+ mPrivateFlags &= ~DRAWABLE_STATE_DIRTY;
+ return mDrawableState;
+ }
+ }
+
+ /**
+ * Generate the new {@link android.graphics.drawable.Drawable} state for
+ * this view. This is called by the view
+ * system when the cached Drawable state is determined to be invalid. To
+ * retrieve the current state, you should use {@link #getDrawableState}.
+ *
+ * @param extraSpace if non-zero, this is the number of extra entries you
+ * would like in the returned array in which you can place your own
+ * states.
+ *
+ * @return Returns an array holding the current {@link Drawable} state of
+ * the view.
+ *
+ * @see #mergeDrawableStates
+ */
+ protected int[] onCreateDrawableState(int extraSpace) {
+ if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE &&
+ mParent instanceof View) {
+ return ((View) mParent).onCreateDrawableState(extraSpace);
+ }
+
+ int[] drawableState;
+
+ int privateFlags = mPrivateFlags;
+
+ int viewStateIndex = (((privateFlags & PRESSED) != 0) ? 1 : 0);
+
+ viewStateIndex = (viewStateIndex << 1)
+ + (((mViewFlags & ENABLED_MASK) == ENABLED) ? 1 : 0);
+
+ viewStateIndex = (viewStateIndex << 1) + (isFocused() ? 1 : 0);
+
+ viewStateIndex = (viewStateIndex << 1)
+ + (((privateFlags & SELECTED) != 0) ? 1 : 0);
+
+ final boolean hasWindowFocus = hasWindowFocus();
+ viewStateIndex = (viewStateIndex << 1) + (hasWindowFocus ? 1 : 0);
+
+ drawableState = VIEW_STATE_SETS[viewStateIndex];
+
+ //noinspection ConstantIfStatement
+ if (false) {
+ Log.i("View", "drawableStateIndex=" + viewStateIndex);
+ Log.i("View", toString()
+ + " pressed=" + ((privateFlags & PRESSED) != 0)
+ + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED)
+ + " fo=" + hasFocus()
+ + " sl=" + ((privateFlags & SELECTED) != 0)
+ + " wf=" + hasWindowFocus
+ + ": " + Arrays.toString(drawableState));
+ }
+
+ if (extraSpace == 0) {
+ return drawableState;
+ }
+
+ final int[] fullState;
+ if (drawableState != null) {
+ fullState = new int[drawableState.length + extraSpace];
+ System.arraycopy(drawableState, 0, fullState, 0, drawableState.length);
+ } else {
+ fullState = new int[extraSpace];
+ }
+
+ return fullState;
+ }
+
+ /**
+ * Merge your own state values in <var>additionalState</var> into the base
+ * state values <var>baseState</var> that were returned by
+ * {@link #onCreateDrawableState}.
+ *
+ * @param baseState The base state values returned by
+ * {@link #onCreateDrawableState}, which will be modified to also hold your
+ * own additional state values.
+ *
+ * @param additionalState The additional state values you would like
+ * added to <var>baseState</var>; this array is not modified.
+ *
+ * @return As a convenience, the <var>baseState</var> array you originally
+ * passed into the function is returned.
+ *
+ * @see #onCreateDrawableState
+ */
+ protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) {
+ final int N = baseState.length;
+ int i = N - 1;
+ while (i >= 0 && baseState[i] == 0) {
+ i--;
+ }
+ System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length);
+ return baseState;
+ }
+
+ /**
+ * Sets the background color for this view.
+ * @param color the color of the background
+ */
+ public void setBackgroundColor(int color) {
+ setBackgroundDrawable(new ColorDrawable(color));
+ }
+
+ /**
+ * Set the background to a given resource. The resource should refer to
+ * a Drawable object.
+ * @param resid The identifier of the resource.
+ * @attr ref android.R.styleable#View_background
+ */
+ public void setBackgroundResource(int resid) {
+ if (resid != 0 && resid == mBackgroundResource) {
+ return;
+ }
+
+ Drawable d= null;
+ if (resid != 0) {
+ d = mResources.getDrawable(resid);
+ }
+ setBackgroundDrawable(d);
+
+ mBackgroundResource = resid;
+ }
+
+ /**
+ * Set the background to a given Drawable, or remove the background. If the
+ * background has padding, this View's padding is set to the background's
+ * padding. However, when a background is removed, this View's padding isn't
+ * touched. If setting the padding is desired, please use
+ * {@link #setPadding(int, int, int, int)}.
+ *
+ * @param d The Drawable to use as the background, or null to remove the
+ * background
+ */
+ public void setBackgroundDrawable(Drawable d) {
+ boolean requestLayout = false;
+
+ mBackgroundResource = 0;
+
+ /*
+ * Regardless of whether we're setting a new background or not, we want
+ * to clear the previous drawable.
+ */
+ if (mBGDrawable != null) {
+ mBGDrawable.setCallback(null);
+ unscheduleDrawable(mBGDrawable);
+ }
+
+ if (d != null) {
+ Rect padding = sThreadLocal.get();
+ if (padding == null) {
+ padding = new Rect();
+ sThreadLocal.set(padding);
+ }
+ if (d.getPadding(padding)) {
+ setPadding(padding.left, padding.top, padding.right, padding.bottom);
+ }
+
+ // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or
+ // if it has a different minimum size, we should layout again
+ if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() ||
+ mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) {
+ requestLayout = true;
+ }
+
+ d.setCallback(this);
+ if (d.isStateful()) {
+ d.setState(getDrawableState());
+ }
+ d.setVisible(getVisibility() == VISIBLE, false);
+ mBGDrawable = d;
+
+ if ((mPrivateFlags & SKIP_DRAW) != 0) {
+ mPrivateFlags &= ~SKIP_DRAW;
+ mPrivateFlags |= ONLY_DRAWS_BACKGROUND;
+ requestLayout = true;
+ }
+ } else {
+ /* Remove the background */
+ mBGDrawable = null;
+
+ if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) {
+ /*
+ * This view ONLY drew the background before and we're removing
+ * the background, so now it won't draw anything
+ * (hence we SKIP_DRAW)
+ */
+ mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND;
+ mPrivateFlags |= SKIP_DRAW;
+ }
+
+ /*
+ * When the background is set, we try to apply its padding to this
+ * View. When the background is removed, we don't touch this View's
+ * padding. This is noted in the Javadocs. Hence, we don't need to
+ * requestLayout(), the invalidate() below is sufficient.
+ */
+
+ // The old background's minimum size could have affected this
+ // View's layout, so let's requestLayout
+ requestLayout = true;
+ }
+
+ if (requestLayout) {
+ requestLayout();
+ }
+
+ mBackgroundSizeChanged = true;
+ invalidate();
+ }
+
+ /**
+ * Gets the background drawable
+ * @return The drawable used as the background for this view, if any.
+ */
+ public Drawable getBackground() {
+ return mBGDrawable;
+ }
+
+ private int getScrollBarPaddingLeft() {
+ // TODO: Deal with RTL languages
+ return 0;
+ }
+
+ /*
+ * Returns the pixels occupied by the vertical scrollbar, if not overlaid
+ */
+ private int getScrollBarPaddingRight() {
+ // TODO: Deal with RTL languages
+ if ((mViewFlags & SCROLLBARS_VERTICAL) == 0) {
+ return 0;
+ }
+ return (mViewFlags & SCROLLBARS_INSET_MASK) == 0 ? 0 : getVerticalScrollbarWidth();
+ }
+
+ /*
+ * Returns the pixels occupied by the horizontal scrollbar, if not overlaid
+ */
+ private int getScrollBarPaddingBottom() {
+ if ((mViewFlags & SCROLLBARS_HORIZONTAL) == 0) {
+ return 0;
+ }
+ return (mViewFlags & SCROLLBARS_INSET_MASK) == 0 ? 0 : getHorizontalScrollbarHeight();
+ }
+
+ /**
+ * Sets the padding. The view may add on the space required to display
+ * the scrollbars, depending on the style and visibility of the scrollbars.
+ * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop},
+ * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different
+ * from the values set in this call.
+ *
+ * @attr ref android.R.styleable#View_padding
+ * @attr ref android.R.styleable#View_paddingBottom
+ * @attr ref android.R.styleable#View_paddingLeft
+ * @attr ref android.R.styleable#View_paddingRight
+ * @attr ref android.R.styleable#View_paddingTop
+ * @param left the left padding in pixels
+ * @param top the top padding in pixels
+ * @param right the right padding in pixels
+ * @param bottom the bottom padding in pixels
+ */
+ public void setPadding(int left, int top, int right, int bottom) {
+ boolean changed = false;
+
+ mUserPaddingRight = right;
+ mUserPaddingBottom = bottom;
+
+ if (mPaddingLeft != left + getScrollBarPaddingLeft()) {
+ changed = true;
+ mPaddingLeft = left;
+ }
+ if (mPaddingTop != top) {
+ changed = true;
+ mPaddingTop = top;
+ }
+ if (mPaddingRight != right + getScrollBarPaddingRight()) {
+ changed = true;
+ mPaddingRight = right + getScrollBarPaddingRight();
+ }
+ if (mPaddingBottom != bottom + getScrollBarPaddingBottom()) {
+ changed = true;
+ mPaddingBottom = bottom + getScrollBarPaddingBottom();
+ }
+
+ if (changed) {
+ requestLayout();
+ }
+ }
+
+ /**
+ * Returns the top padding of this view.
+ *
+ * @return the top padding in pixels
+ */
+ public int getPaddingTop() {
+ return mPaddingTop;
+ }
+
+ /**
+ * Returns the bottom padding of this view. If there are inset and enabled
+ * scrollbars, this value may include the space required to display the
+ * scrollbars as well.
+ *
+ * @return the bottom padding in pixels
+ */
+ public int getPaddingBottom() {
+ return mPaddingBottom;
+ }
+
+ /**
+ * Returns the left padding of this view. If there are inset and enabled
+ * scrollbars, this value may include the space required to display the
+ * scrollbars as well.
+ *
+ * @return the left padding in pixels
+ */
+ public int getPaddingLeft() {
+ return mPaddingLeft;
+ }
+
+ /**
+ * Returns the right padding of this view. If there are inset and enabled
+ * scrollbars, this value may include the space required to display the
+ * scrollbars as well.
+ *
+ * @return the right padding in pixels
+ */
+ public int getPaddingRight() {
+ return mPaddingRight;
+ }
+
+ /**
+ * Changes the selection state of this view. A view can be selected or not.
+ * Note that selection is not the same as focus. Views are typically
+ * selected in the context of an AdapterView like ListView or GridView;
+ * the selected view is the view that is highlighted.
+ *
+ * @param selected true if the view must be selected, false otherwise
+ */
+ public void setSelected(boolean selected) {
+ if (((mPrivateFlags & SELECTED) != 0) != selected) {
+ mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0);
+ invalidate();
+ refreshDrawableState();
+ dispatchSetSelected(selected);
+ }
+ }
+
+ /**
+ * Dispatch setSelected to all of this View's children.
+ *
+ * @see #setSelected(boolean)
+ *
+ * @param selected The new selected state
+ */
+ protected void dispatchSetSelected(boolean selected) {
+ }
+
+ /**
+ * Indicates the selection state of this view.
+ *
+ * @return true if the view is selected, false otherwise
+ */
+ @ViewDebug.ExportedProperty
+ public boolean isSelected() {
+ return (mPrivateFlags & SELECTED) != 0;
+ }
+
+ /**
+ * Returns the ViewTreeObserver for this view's hierarchy. The view tree
+ * observer can be used to get notifications when global events, like
+ * layout, happen.
+ *
+ * The returned ViewTreeObserver observer is not guaranteed to remain
+ * valid for the lifetime of this View. If the caller of this method keeps
+ * a long-lived reference to ViewTreeObserver, it should always check for
+ * the return value of {@link ViewTreeObserver#isAlive()}.
+ *
+ * @return The ViewTreeObserver for this view's hierarchy.
+ */
+ public ViewTreeObserver getViewTreeObserver() {
+ if (mAttachInfo != null) {
+ return mAttachInfo.mTreeObserver;
+ }
+ if (mFloatingTreeObserver == null) {
+ mFloatingTreeObserver = new ViewTreeObserver();
+ }
+ return mFloatingTreeObserver;
+ }
+
+ /**
+ * <p>Finds the topmost view in the current view hierarchy.</p>
+ *
+ * @return the topmost view containing this view
+ */
+ public View getRootView() {
+ if (mAttachInfo != null) {
+ final View v = mAttachInfo.mRootView;
+ if (v != null) {
+ return v;
+ }
+ }
+
+ View parent = this;
+
+ while (parent.mParent != null && parent.mParent instanceof View) {
+ parent = (View) parent.mParent;
+ }
+
+ return parent;
+ }
+
+ /**
+ * <p>Computes the coordinates of this view on the screen. The argument
+ * must be an array of two integers. After the method returns, the array
+ * contains the x and y location in that order.</p>
+ *
+ * @param location an array of two integers in which to hold the coordinates
+ */
+ public void getLocationOnScreen(int[] location) {
+ getLocationInWindow(location);
+
+ final AttachInfo info = mAttachInfo;
+ location[0] += info.mWindowLeft;
+ location[1] += info.mWindowTop;
+ }
+
+ /**
+ * <p>Computes the coordinates of this view in its window. The argument
+ * must be an array of two integers. After the method returns, the array
+ * contains the x and y location in that order.</p>
+ *
+ * @param location an array of two integers in which to hold the coordinates
+ */
+ public void getLocationInWindow(int[] location) {
+ if (location == null || location.length < 2) {
+ throw new IllegalArgumentException("location must be an array of "
+ + "two integers");
+ }
+
+ location[0] = mLeft;
+ location[1] = mTop;
+
+ ViewParent viewParent = mParent;
+ while (viewParent instanceof View) {
+ final View view = (View)viewParent;
+ location[0] += view.mLeft - view.mScrollX;
+ location[1] += view.mTop - view.mScrollY;
+ viewParent = view.mParent;
+ }
+
+ if (viewParent instanceof ViewRoot) {
+ // *cough*
+ final ViewRoot vr = (ViewRoot)viewParent;
+ location[1] -= vr.mCurScrollY;
+ }
+ }
+
+ /**
+ * {@hide}
+ * @param id the id of the view to be found
+ * @return the view of the specified id, null if cannot be found
+ */
+ protected View findViewTraversal(int id) {
+ if (id == mID) {
+ return this;
+ }
+ return null;
+ }
+
+ /**
+ * {@hide}
+ * @param tag the tag of the view to be found
+ * @return the view of specified tag, null if cannot be found
+ */
+ protected View findViewWithTagTraversal(Object tag) {
+ if (tag != null && tag.equals(mTag)) {
+ return this;
+ }
+ return null;
+ }
+
+ /**
+ * Look for a child view with the given id. If this view has the given
+ * id, return this view.
+ *
+ * @param id The id to search for.
+ * @return The view that has the given id in the hierarchy or null
+ */
+ public final View findViewById(int id) {
+ if (id < 0) {
+ return null;
+ }
+ return findViewTraversal(id);
+ }
+
+ /**
+ * Look for a child view with the given tag. If this view has the given
+ * tag, return this view.
+ *
+ * @param tag The tag to search for, using "tag.equals(getTag())".
+ * @return The View that has the given tag in the hierarchy or null
+ */
+ public final View findViewWithTag(Object tag) {
+ if (tag == null) {
+ return null;
+ }
+ return findViewWithTagTraversal(tag);
+ }
+
+ /**
+ * Sets the identifier for this view. The identifier does not have to be
+ * unique in this view's hierarchy. The identifier should be a positive
+ * number.
+ *
+ * @see #NO_ID
+ * @see #getId
+ * @see #findViewById
+ *
+ * @param id a number used to identify the view
+ *
+ * @attr ref android.R.styleable#View_id
+ */
+ public void setId(int id) {
+ mID = id;
+ }
+
+ /**
+ * {@hide}
+ *
+ * @param isRoot true if the view belongs to the root namespace, false
+ * otherwise
+ */
+ public void setIsRootNamespace(boolean isRoot) {
+ if (isRoot) {
+ mPrivateFlags |= IS_ROOT_NAMESPACE;
+ } else {
+ mPrivateFlags &= ~IS_ROOT_NAMESPACE;
+ }
+ }
+
+ /**
+ * {@hide}
+ *
+ * @return true if the view belongs to the root namespace, false otherwise
+ */
+ public boolean isRootNamespace() {
+ return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0;
+ }
+
+ /**
+ * Returns this view's identifier.
+ *
+ * @return a positive integer used to identify the view or {@link #NO_ID}
+ * if the view has no ID
+ *
+ * @see #setId
+ * @see #findViewById
+ * @attr ref android.R.styleable#View_id
+ */
+ @ViewDebug.CapturedViewProperty
+ public int getId() {
+ return mID;
+ }
+
+ /**
+ * Returns this view's tag.
+ *
+ * @return the Object stored in this view as a tag
+ */
+ @ViewDebug.ExportedProperty
+ public Object getTag() {
+ return mTag;
+ }
+
+ /**
+ * Sets the tag associated with this view. A tag can be used to mark
+ * a view in its hierarchy and does not have to be unique within the
+ * hierarchy. Tags can also be used to store data within a view without
+ * resorting to another data structure.
+ *
+ * @param tag an Object to tag the view with
+ */
+ public void setTag(final Object tag) {
+ mTag = tag;
+ }
+
+ /**
+ * Prints information about this view in the log output, with the tag
+ * {@link #VIEW_LOG_TAG}.
+ *
+ * @hide
+ */
+ public void debug() {
+ debug(0);
+ }
+
+ /**
+ * Prints information about this view in the log output, with the tag
+ * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an
+ * indentation defined by the <code>depth</code>.
+ *
+ * @param depth the indentation level
+ *
+ * @hide
+ */
+ protected void debug(int depth) {
+ String output = debugIndent(depth - 1);
+
+ output += "+ " + this;
+ int id = getId();
+ if (id != -1) {
+ output += " (id=" + id + ")";
+ }
+ Object tag = getTag();
+ if (tag != null) {
+ output += " (tag=" + tag + ")";
+ }
+ Log.d(VIEW_LOG_TAG, output);
+
+ if ((mPrivateFlags & FOCUSED) != 0) {
+ output = debugIndent(depth) + " FOCUSED";
+ Log.d(VIEW_LOG_TAG, output);
+ }
+
+ output = debugIndent(depth);
+ output += "frame={" + mLeft + ", " + mTop + ", " + mRight
+ + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY
+ + "} ";
+ Log.d(VIEW_LOG_TAG, output);
+
+ if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0
+ || mPaddingBottom != 0) {
+ output = debugIndent(depth);
+ output += "padding={" + mPaddingLeft + ", " + mPaddingTop
+ + ", " + mPaddingRight + ", " + mPaddingBottom + "}";
+ Log.d(VIEW_LOG_TAG, output);
+ }
+
+ output = debugIndent(depth);
+ output += "mMeasureWidth=" + mMeasuredWidth +
+ " mMeasureHeight=" + mMeasuredHeight;
+ Log.d(VIEW_LOG_TAG, output);
+
+ output = debugIndent(depth);
+ if (mLayoutParams == null) {
+ output += "BAD! no layout params";
+ } else {
+ output = mLayoutParams.debug(output);
+ }
+ Log.d(VIEW_LOG_TAG, output);
+
+ output = debugIndent(depth);
+ output += "flags={";
+ output += View.printFlags(mViewFlags);
+ output += "}";
+ Log.d(VIEW_LOG_TAG, output);
+
+ output = debugIndent(depth);
+ output += "privateFlags={";
+ output += View.printPrivateFlags(mPrivateFlags);
+ output += "}";
+ Log.d(VIEW_LOG_TAG, output);
+ }
+
+ /**
+ * Creates an string of whitespaces used for indentation.
+ *
+ * @param depth the indentation level
+ * @return a String containing (depth * 2 + 3) * 2 white spaces
+ *
+ * @hide
+ */
+ protected static String debugIndent(int depth) {
+ StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2);
+ for (int i = 0; i < (depth * 2) + 3; i++) {
+ spaces.append(' ').append(' ');
+ }
+ return spaces.toString();
+ }
+
+ /**
+ * <p>Return the offset of the widget's text baseline from the widget's top
+ * boundary. If this widget does not support baseline alignment, this
+ * method returns -1. </p>
+ *
+ * @return the offset of the baseline within the widget's bounds or -1
+ * if baseline alignment is not supported
+ */
+ @ViewDebug.ExportedProperty
+ public int getBaseline() {
+ return -1;
+ }
+
+ /**
+ * Call this when something has changed which has invalidated the
+ * layout of this view. This will schedule a layout pass of the view
+ * tree.
+ */
+ public void requestLayout() {
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT);
+ }
+
+ mPrivateFlags |= FORCE_LAYOUT;
+
+ if (mParent != null && !mParent.isLayoutRequested()) {
+ mParent.requestLayout();
+ }
+ }
+
+ /**
+ * Forces this view to be laid out during the next layout pass.
+ * This method does not call requestLayout() or forceLayout()
+ * on the parent.
+ */
+ public void forceLayout() {
+ mPrivateFlags |= FORCE_LAYOUT;
+ }
+
+ /**
+ * <p>
+ * This is called to find out how big a view should be. The parent
+ * supplies constraint information in the width and height parameters.
+ * </p>
+ *
+ * <p>
+ * The actual mesurement work of a view is performed in
+ * {@link #onMeasure(int, int)}, called by this method. Therefore, only
+ * {@link #onMeasure(int, int)} can and must be overriden by subclasses.
+ * </p>
+ *
+ *
+ * @param widthMeasureSpec Horizontal space requirements as imposed by the
+ * parent
+ * @param heightMeasureSpec Vertical space requirements as imposed by the
+ * parent
+ *
+ * @see #onMeasure(int, int)
+ */
+ public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
+ if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT ||
+ widthMeasureSpec != mOldWidthMeasureSpec ||
+ heightMeasureSpec != mOldHeightMeasureSpec) {
+
+ // first clears the measured dimension flag
+ mPrivateFlags &= ~MEASURED_DIMENSION_SET;
+
+ if (ViewDebug.TRACE_HIERARCHY) {
+ ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE);
+ }
+
+ // measure ourselves, this should set the measured dimension flag back
+ onMeasure(widthMeasureSpec, heightMeasureSpec);
+
+ // flag not set, setMeasuredDimension() was not invoked, we raise
+ // an exception to warn the developer
+ if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) {
+ throw new IllegalStateException("onMeasure() did not set the"
+ + " measured dimension by calling"
+ + " setMeasuredDimension()");
+ }
+
+ mPrivateFlags |= LAYOUT_REQUIRED;
+ }
+
+ mOldWidthMeasureSpec = widthMeasureSpec;
+ mOldHeightMeasureSpec = heightMeasureSpec;
+ }
+
+ /**
+ * <p>
+ * Measure the view and its content to determine the measured width and the
+ * measured height. This method is invoked by {@link #measure(int, int)} and
+ * should be overriden by subclasses to provide accurate and efficient
+ * measurement of their contents.
+ * </p>
+ *
+ * <p>
+ * <strong>CONTRACT:</strong> When overriding this method, you
+ * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the
+ * measured width and height of this view. Failure to do so will trigger an
+ * <code>IllegalStateException</code>, thrown by
+ * {@link #measure(int, int)}. Calling the superclass'
+ * {@link #onMeasure(int, int)} is a valid use.
+ * </p>
+ *
+ * <p>
+ * The base class implementation of measure defaults to the background size,
+ * unless a larger size is allowed by the MeasureSpec. Subclasses should
+ * override {@link #onMeasure(int, int)} to provide better measurements of
+ * their content.
+ * </p>
+ *
+ * <p>
+ * If this method is overridden, it is the subclass's responsibility to make
+ * sure the measured height and width are at least the view's minimum height
+ * and width ({@link #getSuggestedMinimumHeight()} and
+ * {@link #getSuggestedMinimumWidth()}).
+ * </p>
+ *
+ * @param widthMeasureSpec horizontal space requirements as imposed by the parent.
+ * The requirements are encoded with
+ * {@link android.view.View.MeasureSpec}.
+ * @param heightMeasureSpec vertical space requirements as imposed by the parent.
+ * The requirements are encoded with
+ * {@link android.view.View.MeasureSpec}.
+ *
+ * @see #getMeasuredWidth()
+ * @see #getMeasuredHeight()
+ * @see #setMeasuredDimension(int, int)
+ * @see #getSuggestedMinimumHeight()
+ * @see #getSuggestedMinimumWidth()
+ * @see android.view.View.MeasureSpec#getMode(int)
+ * @see android.view.View.MeasureSpec#getSize(int)
+ */
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec),
+ getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec));
+ }
+
+ /**
+ * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the
+ * measured width and measured height. Failing to do so will trigger an
+ * exception at measurement time.</p>
+ *
+ * @param measuredWidth the measured width of this view
+ * @param measuredHeight the measured height of this view
+ */
+ protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) {
+ mMeasuredWidth = measuredWidth;
+ mMeasuredHeight = measuredHeight;
+
+ mPrivateFlags |= MEASURED_DIMENSION_SET;
+ }
+
+ /**
+ * Utility to reconcile a desired size with constraints imposed by a MeasureSpec.
+ * Will take the desired size, unless a different size is imposed by the constraints.
+ *
+ * @param size How big the view wants to be
+ * @param measureSpec Constraints imposed by the parent
+ * @return The size this view should be.
+ */
+ public static int resolveSize(int size, int measureSpec) {
+ int result = size;
+ int specMode = MeasureSpec.getMode(measureSpec);
+ int specSize = MeasureSpec.getSize(measureSpec);
+ switch (specMode) {
+ case MeasureSpec.UNSPECIFIED:
+ result = size;
+ break;
+ case MeasureSpec.AT_MOST:
+ result = Math.min(size, specSize);
+ break;
+ case MeasureSpec.EXACTLY:
+ result = specSize;
+ break;
+ }
+ return result;
+ }
+
+ /**
+ * Utility to return a default size. Uses the supplied size if the
+ * MeasureSpec imposed no contraints. Will get larger if allowed
+ * by the MeasureSpec.
+ *
+ * @param size Default size for this view
+ * @param measureSpec Constraints imposed by the parent
+ * @return The size this view should be.
+ */
+ public static int getDefaultSize(int size, int measureSpec) {
+ int result = size;
+ int specMode = MeasureSpec.getMode(measureSpec);
+ int specSize = MeasureSpec.getSize(measureSpec);
+
+ switch (specMode) {
+ case MeasureSpec.UNSPECIFIED:
+ result = size;
+ break;
+ case MeasureSpec.AT_MOST:
+ case MeasureSpec.EXACTLY:
+ result = specSize;
+ break;
+ }
+ return result;
+ }
+
+ /**
+ * Returns the suggested minimum height that the view should use. This
+ * returns the maximum of the view's minimum height
+ * and the background's minimum height
+ * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}).
+ * <p>
+ * When being used in {@link #onMeasure(int, int)}, the caller should still
+ * ensure the returned height is within the requirements of the parent.
+ *
+ * @return The suggested minimum height of the view.
+ */
+ protected int getSuggestedMinimumHeight() {
+ int suggestedMinHeight = mMinHeight;
+
+ if (mBGDrawable != null) {
+ final int bgMinHeight = mBGDrawable.getMinimumHeight();
+ if (suggestedMinHeight < bgMinHeight) {
+ suggestedMinHeight = bgMinHeight;
+ }
+ }
+
+ return suggestedMinHeight;
+ }
+
+ /**
+ * Returns the suggested minimum width that the view should use. This
+ * returns the maximum of the view's minimum width)
+ * and the background's minimum width
+ * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}).
+ * <p>
+ * When being used in {@link #onMeasure(int, int)}, the caller should still
+ * ensure the returned width is within the requirements of the parent.
+ *
+ * @return The suggested minimum width of the view.
+ */
+ protected int getSuggestedMinimumWidth() {
+ int suggestedMinWidth = mMinWidth;
+
+ if (mBGDrawable != null) {
+ final int bgMinWidth = mBGDrawable.getMinimumWidth();
+ if (suggestedMinWidth < bgMinWidth) {
+ suggestedMinWidth = bgMinWidth;
+ }
+ }
+
+ return suggestedMinWidth;
+ }
+
+ /**
+ * Sets the minimum height of the view. It is not guaranteed the view will
+ * be able to achieve this minimum height (for example, if its parent layout
+ * constrains it with less available height).
+ *
+ * @param minHeight The minimum height the view will try to be.
+ */
+ public void setMinimumHeight(int minHeight) {
+ mMinHeight = minHeight;
+ }
+
+ /**
+ * Sets the minimum width of the view. It is not guaranteed the view will
+ * be able to achieve this minimum width (for example, if its parent layout
+ * constrains it with less available width).
+ *
+ * @param minWidth The minimum width the view will try to be.
+ */
+ public void setMinimumWidth(int minWidth) {
+ mMinWidth = minWidth;
+ }
+
+ /**
+ * Get the animation currently associated with this view.
+ *
+ * @return The animation that is currently playing or
+ * scheduled to play for this view.
+ */
+ public Animation getAnimation() {
+ return mCurrentAnimation;
+ }
+
+ /**
+ * Start the specified animation now.
+ *
+ * @param animation the animation to start now
+ */
+ public void startAnimation(Animation animation) {
+ animation.setStartTime(Animation.START_ON_FIRST_FRAME);
+ setAnimation(animation);
+ invalidate();
+ }
+
+ /**
+ * Cancels any animations for this view.
+ */
+ public void clearAnimation() {
+ mCurrentAnimation = null;
+ }
+
+ /**
+ * Sets the next animation to play for this view.
+ * If you want the animation to play immediately, use
+ * startAnimation. This method provides allows fine-grained
+ * control over the start time and invalidation, but you
+ * must make sure that 1) the animation has a start time set, and
+ * 2) the view will be invalidated when the animation is supposed to
+ * start.
+ *
+ * @param animation The next animation, or null.
+ */
+ public void setAnimation(Animation animation) {
+ mCurrentAnimation = animation;
+ if (animation != null) {
+ animation.reset();
+ }
+ }
+
+ /**
+ * Invoked by a parent ViewGroup to notify the start of the animation
+ * currently associated with this view. If you override this method,
+ * always call super.onAnimationStart();
+ *
+ * @see #setAnimation(android.view.animation.Animation)
+ * @see #getAnimation()
+ */
+ protected void onAnimationStart() {
+ mPrivateFlags |= ANIMATION_STARTED;
+ }
+
+ /**
+ * Invoked by a parent ViewGroup to notify the end of the animation
+ * currently associated with this view. If you override this method,
+ * always call super.onAnimationEnd();
+ *
+ * @see #setAnimation(android.view.animation.Animation)
+ * @see #getAnimation()
+ */
+ protected void onAnimationEnd() {
+ mPrivateFlags &= ~ANIMATION_STARTED;
+ }
+
+ /**
+ * Invoked if there is a Transform that involves alpha. Subclass that can
+ * draw themselves with the specified alpha should return true, and then
+ * respect that alpha when their onDraw() is called. If this returns false
+ * then the view may be redirected to draw into an offscreen buffer to
+ * fulfill the request, which will look fine, but may be slower than if the
+ * subclass handles it internally. The default implementation returns false.
+ *
+ * @param alpha The alpha (0..255) to apply to the view's drawing
+ * @return true if the view can draw with the specified alpha.
+ */
+ protected boolean onSetAlpha(int alpha) {
+ return false;
+ }
+
+ /**
+ * This is used by the RootView to perform an optimization when
+ * the view hierarchy contains one or several SurfaceView.
+ * SurfaceView is always considered transparent, but its children are not,
+ * therefore all View objects remove themselves from the global transparent
+ * region (passed as a parameter to this function).
+ *
+ * @param region The transparent region for this ViewRoot (window).
+ *
+ * @return Returns true if the effective visibility of the view at this
+ * point is opaque, regardless of the transparent region; returns false
+ * if it is possible for underlying windows to be seen behind the view.
+ *
+ * {@hide}
+ */
+ public boolean gatherTransparentRegion(Region region) {
+ final AttachInfo attachInfo = mAttachInfo;
+ if (region != null && attachInfo != null) {
+ final int pflags = mPrivateFlags;
+ if ((pflags & SKIP_DRAW) == 0) {
+ // The SKIP_DRAW flag IS NOT set, so this view draws. We need to
+ // remove it from the transparent region.
+ final int[] location = attachInfo.mTransparentLocation;
+ getLocationInWindow(location);
+ region.op(location[0], location[1], location[0] + mRight - mLeft,
+ location[1] + mBottom - mTop, Region.Op.DIFFERENCE);
+ } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) {
+ // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable
+ // exists, so we remove the background drawable's non-transparent
+ // parts from this transparent region.
+ applyDrawableToTransparentRegion(mBGDrawable, region);
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Play a sound effect for this view.
+ *
+ * <p>The framework will play sound effects for some built in actions, such as
+ * clicking, but you may wish to play these effects in your widget,
+ * for instance, for internal navigation.
+ *
+ * <p>The sound effect will only be played if sound effects are enabled by the user, and
+ * {@link #isSoundEffectsEnabled()} is true.
+ *
+ * @param soundConstant One of the constants defined in {@link SoundEffectConstants}
+ */
+ public void playSoundEffect(int soundConstant) {
+ if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) {
+ return;
+ }
+ mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant);
+ }
+
+ /**
+ * Provide haptic feedback to the user for this view.
+ *
+ * <p>The framework will provide haptic feedback for some built in actions,
+ * such as long presses, but you may wish to provide feedback for your
+ * own widget.
+ *
+ * <p>The feedback will only be performed if
+ * {@link #isHapticFeedbackEnabled()} is true.
+ *
+ * @param feedbackConstant One of the constants defined in
+ * {@link HapticFeedbackConstants}
+ */
+ public boolean performHapticFeedback(int feedbackConstant) {
+ return performHapticFeedback(feedbackConstant, 0);
+ }
+
+ /**
+ * Like {@link #performHapticFeedback(int)}, with additional options.
+ *
+ * @param feedbackConstant One of the constants defined in
+ * {@link HapticFeedbackConstants}
+ * @param flags Additional flags as per {@link HapticFeedbackConstants}.
+ */
+ public boolean performHapticFeedback(int feedbackConstant, int flags) {
+ if (mAttachInfo == null) {
+ return false;
+ }
+ if ((flags&HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0
+ && !isHapticFeedbackEnabled()) {
+ return false;
+ }
+ return mAttachInfo.mRootCallbacks.performHapticFeedback(
+ feedbackConstant,
+ (flags&HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0);
+ }
+
+ /**
+ * Given a Drawable whose bounds have been set to draw into this view,
+ * update a Region being computed for {@link #gatherTransparentRegion} so
+ * that any non-transparent parts of the Drawable are removed from the
+ * given transparent region.
+ *
+ * @param dr The Drawable whose transparency is to be applied to the region.
+ * @param region A Region holding the current transparency information,
+ * where any parts of the region that are set are considered to be
+ * transparent. On return, this region will be modified to have the
+ * transparency information reduced by the corresponding parts of the
+ * Drawable that are not transparent.
+ * {@hide}
+ */
+ public void applyDrawableToTransparentRegion(Drawable dr, Region region) {
+ if (DBG) {
+ Log.i("View", "Getting transparent region for: " + this);
+ }
+ final Region r = dr.getTransparentRegion();
+ final Rect db = dr.getBounds();
+ final AttachInfo attachInfo = mAttachInfo;
+ if (r != null && attachInfo != null) {
+ final int w = getRight()-getLeft();
+ final int h = getBottom()-getTop();
+ if (db.left > 0) {
+ //Log.i("VIEW", "Drawable left " + db.left + " > view 0");
+ r.op(0, 0, db.left, h, Region.Op.UNION);
+ }
+ if (db.right < w) {
+ //Log.i("VIEW", "Drawable right " + db.right + " < view " + w);
+ r.op(db.right, 0, w, h, Region.Op.UNION);
+ }
+ if (db.top > 0) {
+ //Log.i("VIEW", "Drawable top " + db.top + " > view 0");
+ r.op(0, 0, w, db.top, Region.Op.UNION);
+ }
+ if (db.bottom < h) {
+ //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h);
+ r.op(0, db.bottom, w, h, Region.Op.UNION);
+ }
+ final int[] location = attachInfo.mTransparentLocation;
+ getLocationInWindow(location);
+ r.translate(location[0], location[1]);
+ region.op(r, Region.Op.INTERSECT);
+ } else {
+ region.op(db, Region.Op.DIFFERENCE);
+ }
+ }
+
+ private void postCheckForLongClick() {
+ mHasPerformedLongPress = false;
+
+ if (mPendingCheckForLongPress == null) {
+ mPendingCheckForLongPress = new CheckForLongPress();
+ }
+ mPendingCheckForLongPress.rememberWindowAttachCount();
+ postDelayed(mPendingCheckForLongPress, ViewConfiguration.getLongPressTimeout());
+ }
+
+ private static int[] stateSetUnion(final int[] stateSet1,
+ final int[] stateSet2) {
+ final int stateSet1Length = stateSet1.length;
+ final int stateSet2Length = stateSet2.length;
+ final int[] newSet = new int[stateSet1Length + stateSet2Length];
+ int k = 0;
+ int i = 0;
+ int j = 0;
+ // This is a merge of the two input state sets and assumes that the
+ // input sets are sorted by the order imposed by ViewDrawableStates.
+ for (int viewState : R.styleable.ViewDrawableStates) {
+ if (i < stateSet1Length && stateSet1[i] == viewState) {
+ newSet[k++] = viewState;
+ i++;
+ } else if (j < stateSet2Length && stateSet2[j] == viewState) {
+ newSet[k++] = viewState;
+ j++;
+ }
+ if (k > 1) {
+ assert(newSet[k - 1] > newSet[k - 2]);
+ }
+ }
+ return newSet;
+ }
+
+ /**
+ * Inflate a view from an XML resource. This convenience method wraps the {@link
+ * LayoutInflater} class, which provides a full range of options for view inflation.
+ *
+ * @param context The Context object for your activity or application.
+ * @param resource The resource ID to inflate
+ * @param root A view group that will be the parent. Used to properly inflate the
+ * layout_* parameters.
+ * @see LayoutInflater
+ */
+ public static View inflate(Context context, int resource, ViewGroup root) {
+ LayoutInflater factory = LayoutInflater.from(context);
+ return factory.inflate(resource, root);
+ }
+
+ /**
+ * A MeasureSpec encapsulates the layout requirements passed from parent to child.
+ * Each MeasureSpec represents a requirement for either the width or the height.
+ * A MeasureSpec is comprised of a size and a mode. There are three possible
+ * modes:
+ * <dl>
+ * <dt>UNSPECIFIED</dt>
+ * <dd>
+ * The parent has not imposed any constraint on the child. It can be whatever size
+ * it wants.
+ * </dd>
+ *
+ * <dt>EXACTLY</dt>
+ * <dd>
+ * The parent has determined an exact size for the child. The child is going to be
+ * given those bounds regardless of how big it wants to be.
+ * </dd>
+ *
+ * <dt>AT_MOST</dt>
+ * <dd>
+ * The child can be as large as it wants up to the specified size.
+ * </dd>
+ * </dl>
+ *
+ * MeasureSpecs are implemented as ints to reduce object allocation. This class
+ * is provided to pack and unpack the <size, mode> tuple into the int.
+ */
+ public static class MeasureSpec {
+ private static final int MODE_SHIFT = 30;
+ private static final int MODE_MASK = 0x3 << MODE_SHIFT;
+
+ /**
+ * Measure specification mode: The parent has not imposed any constraint
+ * on the child. It can be whatever size it wants.
+ */
+ public static final int UNSPECIFIED = 0 << MODE_SHIFT;
+
+ /**
+ * Measure specification mode: The parent has determined an exact size
+ * for the child. The child is going to be given those bounds regardless
+ * of how big it wants to be.
+ */
+ public static final int EXACTLY = 1 << MODE_SHIFT;
+
+ /**
+ * Measure specification mode: The child can be as large as it wants up
+ * to the specified size.
+ */
+ public static final int AT_MOST = 2 << MODE_SHIFT;
+
+ /**
+ * Creates a measure specification based on the supplied size and mode.
+ *
+ * The mode must always be one of the following:
+ * <ul>
+ * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li>
+ * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li>
+ * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li>
+ * </ul>
+ *
+ * @param size the size of the measure specification
+ * @param mode the mode of the measure specification
+ * @return the measure specification based on size and mode
+ */
+ public static int makeMeasureSpec(int size, int mode) {
+ return size + mode;
+ }
+
+ /**
+ * Extracts the mode from the supplied measure specification.
+ *
+ * @param measureSpec the measure specification to extract the mode from
+ * @return {@link android.view.View.MeasureSpec#UNSPECIFIED},
+ * {@link android.view.View.MeasureSpec#AT_MOST} or
+ * {@link android.view.View.MeasureSpec#EXACTLY}
+ */
+ public static int getMode(int measureSpec) {
+ return (measureSpec & MODE_MASK);
+ }
+
+ /**
+ * Extracts the size from the supplied measure specification.
+ *
+ * @param measureSpec the measure specification to extract the size from
+ * @return the size in pixels defined in the supplied measure specification
+ */
+ public static int getSize(int measureSpec) {
+ return (measureSpec & ~MODE_MASK);
+ }
+
+ /**
+ * Returns a String representation of the specified measure
+ * specification.
+ *
+ * @param measureSpec the measure specification to convert to a String
+ * @return a String with the following format: "MeasureSpec: MODE SIZE"
+ */
+ public static String toString(int measureSpec) {
+ int mode = getMode(measureSpec);
+ int size = getSize(measureSpec);
+
+ StringBuilder sb = new StringBuilder("MeasureSpec: ");
+
+ if (mode == UNSPECIFIED)
+ sb.append("UNSPECIFIED ");
+ else if (mode == EXACTLY)
+ sb.append("EXACTLY ");
+ else if (mode == AT_MOST)
+ sb.append("AT_MOST ");
+ else
+ sb.append(mode).append(" ");
+
+ sb.append(size);
+ return sb.toString();
+ }
+ }
+
+ class CheckForLongPress implements Runnable {
+
+ private int mOriginalWindowAttachCount;
+
+ public void run() {
+ if (isPressed() && (mParent != null) && hasWindowFocus()
+ && mOriginalWindowAttachCount == mWindowAttachCount) {
+ if (performLongClick()) {
+ mHasPerformedLongPress = true;
+ }
+ }
+ }
+
+ public void rememberWindowAttachCount() {
+ mOriginalWindowAttachCount = mWindowAttachCount;
+ }
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when a key event is
+ * dispatched to this view. The callback will be invoked before the key
+ * event is given to the view.
+ */
+ public interface OnKeyListener {
+ /**
+ * Called when a key is dispatched to a view. This allows listeners to
+ * get a chance to respond before the target view.
+ *
+ * @param v The view the key has been dispatched to.
+ * @param keyCode The code for the physical key that was pressed
+ * @param event The KeyEvent object containing full information about
+ * the event.
+ * @return True if the listener has consumed the event, false otherwise.
+ */
+ boolean onKey(View v, int keyCode, KeyEvent event);
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when a touch event is
+ * dispatched to this view. The callback will be invoked before the touch
+ * event is given to the view.
+ */
+ public interface OnTouchListener {
+ /**
+ * Called when a touch event is dispatched to a view. This allows listeners to
+ * get a chance to respond before the target view.
+ *
+ * @param v The view the touch event has been dispatched to.
+ * @param event The MotionEvent object containing full information about
+ * the event.
+ * @return True if the listener has consumed the event, false otherwise.
+ */
+ boolean onTouch(View v, MotionEvent event);
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when a view has been clicked and held.
+ */
+ public interface OnLongClickListener {
+ /**
+ * Called when a view has been clicked and held.
+ *
+ * @param v The view that was clicked and held.
+ *
+ * return True if the callback consumed the long click, false otherwise
+ */
+ boolean onLongClick(View v);
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when the focus state of
+ * a view changed.
+ */
+ public interface OnFocusChangeListener {
+ /**
+ * Called when the focus state of a view has changed.
+ *
+ * @param v The view whose state has changed.
+ * @param hasFocus The new focus state of v.
+ */
+ void onFocusChange(View v, boolean hasFocus);
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when a view is clicked.
+ */
+ public interface OnClickListener {
+ /**
+ * Called when a view has been clicked.
+ *
+ * @param v The view that was clicked.
+ */
+ void onClick(View v);
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when the context menu
+ * for this view is being built.
+ */
+ public interface OnCreateContextMenuListener {
+ /**
+ * Called when the context menu for this view is being built. It is not
+ * safe to hold onto the menu after this method returns.
+ *
+ * @param menu The context menu that is being built
+ * @param v The view for which the context menu is being built
+ * @param menuInfo Extra information about the item for which the
+ * context menu should be shown. This information will vary
+ * depending on the class of v.
+ */
+ void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo);
+ }
+
+ private final class UnsetPressedState implements Runnable {
+ public void run() {
+ setPressed(false);
+ }
+ }
+
+ /**
+ * Base class for derived classes that want to save and restore their own
+ * state in {@link android.view.View#onSaveInstanceState()}.
+ */
+ public static class BaseSavedState extends AbsSavedState {
+ /**
+ * Constructor used when reading from a parcel. Reads the state of the superclass.
+ *
+ * @param source
+ */
+ public BaseSavedState(Parcel source) {
+ super(source);
+ }
+
+ /**
+ * Constructor called by derived classes when creating their SavedState objects
+ *
+ * @param superState The state of the superclass of this view
+ */
+ public BaseSavedState(Parcelable superState) {
+ super(superState);
+ }
+
+ public static final Parcelable.Creator<BaseSavedState> CREATOR =
+ new Parcelable.Creator<BaseSavedState>() {
+ public BaseSavedState createFromParcel(Parcel in) {
+ return new BaseSavedState(in);
+ }
+
+ public BaseSavedState[] newArray(int size) {
+ return new BaseSavedState[size];
+ }
+ };
+ }
+
+ /**
+ * A set of information given to a view when it is attached to its parent
+ * window.
+ */
+ static class AttachInfo {
+
+ interface Callbacks {
+ void playSoundEffect(int effectId);
+ boolean performHapticFeedback(int effectId, boolean always);
+ }
+
+ /**
+ * InvalidateInfo is used to post invalidate(int, int, int, int) messages
+ * to a Handler. This class contains the target (View) to invalidate and
+ * the coordinates of the dirty rectangle.
+ *
+ * For performance purposes, this class also implements a pool of up to
+ * POOL_LIMIT objects that get reused. This reduces memory allocations
+ * whenever possible.
+ *
+ * The pool is implemented as a linked list of InvalidateInfo object with
+ * the root pointing to the next available InvalidateInfo. If the root
+ * is null (i.e. when all instances from the pool have been acquired),
+ * then a new InvalidateInfo is created and returned to the caller.
+ *
+ * An InvalidateInfo is sent back to the pool by calling its release()
+ * method. If the pool is full the object is simply discarded.
+ *
+ * This implementation follows the object pool pattern used in the
+ * MotionEvent class.
+ */
+ static class InvalidateInfo {
+ private static final int POOL_LIMIT = 10;
+ private static final Object sLock = new Object();
+
+ private static int sAcquiredCount = 0;
+ private static InvalidateInfo sRoot;
+
+ private InvalidateInfo next;
+
+ View target;
+
+ int left;
+ int top;
+ int right;
+ int bottom;
+
+ static InvalidateInfo acquire() {
+ synchronized (sLock) {
+ if (sRoot == null) {
+ return new InvalidateInfo();
+ }
+
+ InvalidateInfo info = sRoot;
+ sRoot = info.next;
+ sAcquiredCount--;
+
+ return info;
+ }
+ }
+
+ void release() {
+ synchronized (sLock) {
+ if (sAcquiredCount < POOL_LIMIT) {
+ sAcquiredCount++;
+ next = sRoot;
+ sRoot = this;
+ }
+ }
+ }
+ }
+
+ final IWindowSession mSession;
+
+ final IWindow mWindow;
+
+ final IBinder mWindowToken;
+
+ final Callbacks mRootCallbacks;
+
+ /**
+ * The top view of the hierarchy.
+ */
+ View mRootView;
+
+ IBinder mPanelParentWindowToken;
+ Surface mSurface;
+
+ /**
+ * Left position of this view's window
+ */
+ int mWindowLeft;
+
+ /**
+ * Top position of this view's window
+ */
+ int mWindowTop;
+
+ /**
+ * For windows that are full-screen but using insets to layout inside
+ * of the screen decorations, these are the current insets for the
+ * content of the window.
+ */
+ final Rect mContentInsets = new Rect();
+
+ /**
+ * For windows that are full-screen but using insets to layout inside
+ * of the screen decorations, these are the current insets for the
+ * actual visible parts of the window.
+ */
+ final Rect mVisibleInsets = new Rect();
+
+ /**
+ * The internal insets given by this window. This value is
+ * supplied by the client (through
+ * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will
+ * be given to the window manager when changed to be used in laying
+ * out windows behind it.
+ */
+ final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets
+ = new ViewTreeObserver.InternalInsetsInfo();
+
+ /**
+ * All views in the window's hierarchy that serve as scroll containers,
+ * used to determine if the window can be resized or must be panned
+ * to adjust for a soft input area.
+ */
+ final ArrayList<View> mScrollContainers = new ArrayList<View>();
+
+ /**
+ * Indicates whether the view's window currently has the focus.
+ */
+ boolean mHasWindowFocus;
+
+ /**
+ * The current visibility of the window.
+ */
+ int mWindowVisibility;
+
+ /**
+ * Indicates the time at which drawing started to occur.
+ */
+ long mDrawingTime;
+
+ /**
+ * Indicates whether the view's window is currently in touch mode.
+ */
+ boolean mInTouchMode;
+
+ /**
+ * Indicates that ViewRoot should trigger a global layout change
+ * the next time it performs a traversal
+ */
+ boolean mRecomputeGlobalAttributes;
+
+ /**
+ * Set to true when attributes (like mKeepScreenOn) need to be
+ * recomputed.
+ */
+ boolean mAttributesChanged;
+
+ /**
+ * Set during a traveral if any views want to keep the screen on.
+ */
+ boolean mKeepScreenOn;
+
+ /**
+ * Set if the visibility of any views has changed.
+ */
+ boolean mViewVisibilityChanged;
+
+ /**
+ * Set to true if a view has been scrolled.
+ */
+ boolean mViewScrollChanged;
+
+ /**
+ * Global to the view hierarchy used as a temporary for dealing with
+ * x/y points in the transparent region computations.
+ */
+ final int[] mTransparentLocation = new int[2];
+
+ /**
+ * Global to the view hierarchy used as a temporary for dealing with
+ * x/y points in the ViewGroup.invalidateChild implementation.
+ */
+ final int[] mInvalidateChildLocation = new int[2];
+
+ /**
+ * The view tree observer used to dispatch global events like
+ * layout, pre-draw, touch mode change, etc.
+ */
+ final ViewTreeObserver mTreeObserver = new ViewTreeObserver();
+
+ /**
+ * A Canvas used by the view hierarchy to perform bitmap caching.
+ */
+ Canvas mCanvas;
+
+ /**
+ * A Handler supplied by a view's {@link android.view.ViewRoot}. This
+ * handler can be used to pump events in the UI events queue.
+ */
+ final Handler mHandler;
+
+ /**
+ * Identifier for messages requesting the view to be invalidated.
+ * Such messages should be sent to {@link #mHandler}.
+ */
+ static final int INVALIDATE_MSG = 0x1;
+
+ /**
+ * Identifier for messages requesting the view to invalidate a region.
+ * Such messages should be sent to {@link #mHandler}.
+ */
+ static final int INVALIDATE_RECT_MSG = 0x2;
+
+ /**
+ * Temporary for use in computing invalidate rectangles while
+ * calling up the hierarchy.
+ */
+ final Rect mTmpInvalRect = new Rect();
+
+ /**
+ * Creates a new set of attachment information with the specified
+ * events handler and thread.
+ *
+ * @param handler the events handler the view must use
+ */
+ AttachInfo(IWindowSession session, IWindow window,
+ Handler handler, Callbacks effectPlayer) {
+ mSession = session;
+ mWindow = window;
+ mWindowToken = window.asBinder();
+ mHandler = handler;
+ mRootCallbacks = effectPlayer;
+ }
+ }
+
+ /**
+ * <p>ScrollabilityCache holds various fields used by a View when scrolling
+ * is supported. This avoids keeping too many unused fields in most
+ * instances of View.</p>
+ */
+ private static class ScrollabilityCache {
+ public int fadingEdgeLength;
+
+ public int scrollBarSize;
+ public ScrollBarDrawable scrollBar;
+
+ public final Paint paint;
+ public final Matrix matrix;
+ public Shader shader;
+
+ private int mLastColor;
+
+ public ScrollabilityCache(ViewConfiguration configuration) {
+ fadingEdgeLength = configuration.getScaledFadingEdgeLength();
+ scrollBarSize = configuration.getScaledScrollBarSize();
+
+ paint = new Paint();
+ matrix = new Matrix();
+ // use use a height of 1, and then wack the matrix each time we
+ // actually use it.
+ shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
+
+ paint.setShader(shader);
+ paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
+ }
+
+ public void setFadeColor(int color) {
+ if (color != 0 && color != mLastColor) {
+ mLastColor = color;
+ color |= 0xFF000000;
+
+ shader = new LinearGradient(0, 0, 0, 1, color, 0, Shader.TileMode.CLAMP);
+
+ paint.setShader(shader);
+ // Restore the default transfer mode (src_over)
+ paint.setXfermode(null);
+ }
+ }
+ }
+}