| /* |
| * Copyright (C) 2012 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 com.android.internal.widget; |
| |
| import java.lang.Math; |
| |
| import com.android.internal.R; |
| |
| import android.animation.Animator; |
| import android.animation.Animator.AnimatorListener; |
| import android.animation.AnimatorSet; |
| import android.animation.ObjectAnimator; |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Color; |
| import android.graphics.drawable.ColorDrawable; |
| import android.graphics.drawable.Drawable; |
| import android.graphics.drawable.StateListDrawable; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.util.StateSet; |
| import android.view.View; |
| import android.view.ViewDebug; |
| import android.view.ViewGroup; |
| import android.widget.RemoteViews.RemoteView; |
| |
| /** |
| * A layout that switches between its children based on the requested layout height. |
| * Each child specifies its minimum and maximum valid height. Results are undefined |
| * if children specify overlapping ranges. A child may specify the maximum height |
| * as 'unbounded' to indicate that it is willing to be displayed arbitrarily tall. |
| * |
| * <p> |
| * See {@link SizeAdaptiveLayout.LayoutParams} for a full description of the |
| * layout parameters used by SizeAdaptiveLayout. |
| */ |
| @RemoteView |
| public class SizeAdaptiveLayout extends ViewGroup { |
| |
| private static final String TAG = "SizeAdaptiveLayout"; |
| private static final boolean DEBUG = false; |
| private static final boolean REPORT_BAD_BOUNDS = true; |
| private static final long CROSSFADE_TIME = 250; |
| |
| // TypedArray indices |
| private static final int MIN_VALID_HEIGHT = |
| R.styleable.SizeAdaptiveLayout_Layout_layout_minHeight; |
| private static final int MAX_VALID_HEIGHT = |
| R.styleable.SizeAdaptiveLayout_Layout_layout_maxHeight; |
| |
| // view state |
| private View mActiveChild; |
| private View mLastActive; |
| |
| // animation state |
| private AnimatorSet mTransitionAnimation; |
| private AnimatorListener mAnimatorListener; |
| private ObjectAnimator mFadePanel; |
| private ObjectAnimator mFadeView; |
| private int mCanceledAnimationCount; |
| private View mEnteringView; |
| private View mLeavingView; |
| // View used to hide larger views under smaller ones to create a uniform crossfade |
| private View mModestyPanel; |
| private int mModestyPanelTop; |
| |
| public SizeAdaptiveLayout(Context context) { |
| super(context); |
| initialize(); |
| } |
| |
| public SizeAdaptiveLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| initialize(); |
| } |
| |
| public SizeAdaptiveLayout(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| initialize(); |
| } |
| |
| private void initialize() { |
| mModestyPanel = new View(getContext()); |
| // If the SizeAdaptiveLayout has a solid background, use it as a transition hint. |
| Drawable background = getBackground(); |
| if (background instanceof StateListDrawable) { |
| StateListDrawable sld = (StateListDrawable) background; |
| sld.setState(StateSet.WILD_CARD); |
| background = sld.getCurrent(); |
| } |
| if (background instanceof ColorDrawable) { |
| mModestyPanel.setBackgroundDrawable(background); |
| } else { |
| mModestyPanel.setBackgroundColor(Color.BLACK); |
| } |
| SizeAdaptiveLayout.LayoutParams layout = |
| new SizeAdaptiveLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, |
| ViewGroup.LayoutParams.MATCH_PARENT); |
| mModestyPanel.setLayoutParams(layout); |
| addView(mModestyPanel); |
| mFadePanel = ObjectAnimator.ofFloat(mModestyPanel, "alpha", 0f); |
| mFadeView = ObjectAnimator.ofFloat(null, "alpha", 0f); |
| mAnimatorListener = new BringToFrontOnEnd(); |
| mTransitionAnimation = new AnimatorSet(); |
| mTransitionAnimation.play(mFadeView).with(mFadePanel); |
| mTransitionAnimation.setDuration(CROSSFADE_TIME); |
| mTransitionAnimation.addListener(mAnimatorListener); |
| } |
| |
| /** |
| * Visible for testing |
| * @hide |
| */ |
| public Animator getTransitionAnimation() { |
| return mTransitionAnimation; |
| } |
| |
| /** |
| * Visible for testing |
| * @hide |
| */ |
| public View getModestyPanel() { |
| return mModestyPanel; |
| } |
| |
| @Override |
| public void onAttachedToWindow() { |
| mLastActive = null; |
| // make sure all views start off invisible. |
| for (int i = 0; i < getChildCount(); i++) { |
| getChildAt(i).setVisibility(View.GONE); |
| } |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| if (DEBUG) Log.d(TAG, this + " measure spec: " + |
| MeasureSpec.toString(heightMeasureSpec)); |
| View model = selectActiveChild(heightMeasureSpec); |
| SizeAdaptiveLayout.LayoutParams lp = |
| (SizeAdaptiveLayout.LayoutParams) model.getLayoutParams(); |
| if (DEBUG) Log.d(TAG, "active min: " + lp.minHeight + " max: " + lp.maxHeight); |
| measureChild(model, widthMeasureSpec, heightMeasureSpec); |
| int childHeight = model.getMeasuredHeight(); |
| int childWidth = model.getMeasuredHeight(); |
| int childState = combineMeasuredStates(0, model.getMeasuredState()); |
| if (DEBUG) Log.d(TAG, "measured child at: " + childHeight); |
| int resolvedWidth = resolveSizeAndState(childWidth, widthMeasureSpec, childState); |
| int resolvedHeight = resolveSizeAndState(childHeight, heightMeasureSpec, childState); |
| if (DEBUG) Log.d(TAG, "resolved to: " + resolvedHeight); |
| int boundedHeight = clampSizeToBounds(resolvedHeight, model); |
| if (DEBUG) Log.d(TAG, "bounded to: " + boundedHeight); |
| setMeasuredDimension(resolvedWidth, boundedHeight); |
| } |
| |
| private int clampSizeToBounds(int measuredHeight, View child) { |
| SizeAdaptiveLayout.LayoutParams lp = |
| (SizeAdaptiveLayout.LayoutParams) child.getLayoutParams(); |
| int heightIn = View.MEASURED_SIZE_MASK & measuredHeight; |
| int height = Math.max(heightIn, lp.minHeight); |
| if (lp.maxHeight != SizeAdaptiveLayout.LayoutParams.UNBOUNDED) { |
| height = Math.min(height, lp.maxHeight); |
| } |
| |
| if (REPORT_BAD_BOUNDS && heightIn != height) { |
| Log.d(TAG, this + "child view " + child + " " + |
| "measured out of bounds at " + heightIn +"px " + |
| "clamped to " + height + "px"); |
| } |
| |
| return height; |
| } |
| |
| //TODO extend to width and height |
| private View selectActiveChild(int heightMeasureSpec) { |
| final int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| final int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| |
| View unboundedView = null; |
| View tallestView = null; |
| int tallestViewSize = 0; |
| View smallestView = null; |
| int smallestViewSize = Integer.MAX_VALUE; |
| for (int i = 0; i < getChildCount(); i++) { |
| View child = getChildAt(i); |
| if (child != mModestyPanel) { |
| SizeAdaptiveLayout.LayoutParams lp = |
| (SizeAdaptiveLayout.LayoutParams) child.getLayoutParams(); |
| if (DEBUG) Log.d(TAG, "looking at " + i + |
| " with min: " + lp.minHeight + |
| " max: " + lp.maxHeight); |
| if (lp.maxHeight == SizeAdaptiveLayout.LayoutParams.UNBOUNDED && |
| unboundedView == null) { |
| unboundedView = child; |
| } |
| if (lp.maxHeight > tallestViewSize) { |
| tallestViewSize = lp.maxHeight; |
| tallestView = child; |
| } |
| if (lp.minHeight < smallestViewSize) { |
| smallestViewSize = lp.minHeight; |
| smallestView = child; |
| } |
| if (heightMode != MeasureSpec.UNSPECIFIED && |
| heightSize >= lp.minHeight && heightSize <= lp.maxHeight) { |
| if (DEBUG) Log.d(TAG, " found exact match, finishing early"); |
| return child; |
| } |
| } |
| } |
| if (unboundedView != null) { |
| tallestView = unboundedView; |
| } |
| if (heightMode == MeasureSpec.UNSPECIFIED || heightSize > tallestViewSize) { |
| return tallestView; |
| } else { |
| return smallestView; |
| } |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| if (DEBUG) Log.d(TAG, this + " onlayout height: " + (bottom - top)); |
| mLastActive = mActiveChild; |
| int measureSpec = View.MeasureSpec.makeMeasureSpec(bottom - top, |
| View.MeasureSpec.EXACTLY); |
| mActiveChild = selectActiveChild(measureSpec); |
| mActiveChild.setVisibility(View.VISIBLE); |
| |
| if (mLastActive != mActiveChild && mLastActive != null) { |
| if (DEBUG) Log.d(TAG, this + " changed children from: " + mLastActive + |
| " to: " + mActiveChild); |
| |
| mEnteringView = mActiveChild; |
| mLeavingView = mLastActive; |
| |
| mEnteringView.setAlpha(1f); |
| |
| mModestyPanel.setAlpha(1f); |
| mModestyPanel.bringToFront(); |
| mModestyPanelTop = mLeavingView.getHeight(); |
| mModestyPanel.setVisibility(View.VISIBLE); |
| // TODO: mModestyPanel background should be compatible with mLeavingView |
| |
| mLeavingView.bringToFront(); |
| |
| if (mTransitionAnimation.isRunning()) { |
| mTransitionAnimation.cancel(); |
| } |
| mFadeView.setTarget(mLeavingView); |
| mFadeView.setFloatValues(0f); |
| mFadePanel.setFloatValues(0f); |
| mTransitionAnimation.setupStartValues(); |
| mTransitionAnimation.start(); |
| } |
| final int childWidth = mActiveChild.getMeasuredWidth(); |
| final int childHeight = mActiveChild.getMeasuredHeight(); |
| // TODO investigate setting LAYER_TYPE_HARDWARE on mLastActive |
| mActiveChild.layout(0, 0, childWidth, childHeight); |
| |
| if (DEBUG) Log.d(TAG, "got modesty offset of " + mModestyPanelTop); |
| mModestyPanel.layout(0, mModestyPanelTop, childWidth, mModestyPanelTop + childHeight); |
| } |
| |
| @Override |
| public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| if (DEBUG) Log.d(TAG, "generate layout from attrs"); |
| return new SizeAdaptiveLayout.LayoutParams(getContext(), attrs); |
| } |
| |
| @Override |
| protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| if (DEBUG) Log.d(TAG, "generate default layout from viewgroup"); |
| return new SizeAdaptiveLayout.LayoutParams(p); |
| } |
| |
| @Override |
| protected LayoutParams generateDefaultLayoutParams() { |
| if (DEBUG) Log.d(TAG, "generate default layout from null"); |
| return new SizeAdaptiveLayout.LayoutParams(); |
| } |
| |
| @Override |
| protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| return p instanceof SizeAdaptiveLayout.LayoutParams; |
| } |
| |
| /** |
| * Per-child layout information associated with ViewSizeAdaptiveLayout. |
| * |
| * TODO extend to width and height |
| * |
| * @attr ref android.R.styleable#SizeAdaptiveLayout_Layout_layout_minHeight |
| * @attr ref android.R.styleable#SizeAdaptiveLayout_Layout_layout_maxHeight |
| */ |
| public static class LayoutParams extends ViewGroup.LayoutParams { |
| |
| /** |
| * Indicates the minimum valid height for the child. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int minHeight; |
| |
| /** |
| * Indicates the maximum valid height for the child. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int maxHeight; |
| |
| /** |
| * Constant value for maxHeight that indicates there is not maximum height. |
| */ |
| public static final int UNBOUNDED = -1; |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public LayoutParams(Context c, AttributeSet attrs) { |
| super(c, attrs); |
| if (DEBUG) { |
| Log.d(TAG, "construct layout from attrs"); |
| for (int i = 0; i < attrs.getAttributeCount(); i++) { |
| Log.d(TAG, " " + attrs.getAttributeName(i) + " = " + |
| attrs.getAttributeValue(i)); |
| } |
| } |
| TypedArray a = |
| c.obtainStyledAttributes(attrs, |
| R.styleable.SizeAdaptiveLayout_Layout); |
| |
| minHeight = a.getDimensionPixelSize(MIN_VALID_HEIGHT, 0); |
| if (DEBUG) Log.d(TAG, "got minHeight of: " + minHeight); |
| |
| try { |
| maxHeight = a.getLayoutDimension(MAX_VALID_HEIGHT, UNBOUNDED); |
| if (DEBUG) Log.d(TAG, "got maxHeight of: " + maxHeight); |
| } catch (Exception e) { |
| if (DEBUG) Log.d(TAG, "caught exception looking for maxValidHeight " + e); |
| } |
| |
| a.recycle(); |
| } |
| |
| /** |
| * Creates a new set of layout parameters with the specified width, height |
| * and valid height bounds. |
| * |
| * @param width the width, either {@link #MATCH_PARENT}, |
| * {@link #WRAP_CONTENT} or a fixed size in pixels |
| * @param height the height, either {@link #MATCH_PARENT}, |
| * {@link #WRAP_CONTENT} or a fixed size in pixels |
| * @param minHeight the minimum height of this child |
| * @param maxHeight the maximum height of this child |
| * or {@link #UNBOUNDED} if the child can grow forever |
| */ |
| public LayoutParams(int width, int height, int minHeight, int maxHeight) { |
| super(width, height); |
| this.minHeight = minHeight; |
| this.maxHeight = maxHeight; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public LayoutParams(int width, int height) { |
| this(width, height, UNBOUNDED, UNBOUNDED); |
| } |
| |
| /** |
| * Constructs a new LayoutParams with default values as defined in {@link LayoutParams}. |
| */ |
| public LayoutParams() { |
| this(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public LayoutParams(ViewGroup.LayoutParams p) { |
| super(p); |
| minHeight = UNBOUNDED; |
| maxHeight = UNBOUNDED; |
| } |
| |
| public String debug(String output) { |
| return output + "SizeAdaptiveLayout.LayoutParams={" + |
| ", max=" + maxHeight + |
| ", max=" + minHeight + "}"; |
| } |
| } |
| |
| class BringToFrontOnEnd implements AnimatorListener { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| if (mCanceledAnimationCount == 0) { |
| mLeavingView.setVisibility(View.GONE); |
| mModestyPanel.setVisibility(View.GONE); |
| mEnteringView.bringToFront(); |
| mEnteringView = null; |
| mLeavingView = null; |
| } else { |
| mCanceledAnimationCount--; |
| } |
| } |
| |
| @Override |
| public void onAnimationCancel(Animator animation) { |
| mCanceledAnimationCount++; |
| } |
| |
| @Override |
| public void onAnimationRepeat(Animator animation) { |
| if (DEBUG) Log.d(TAG, "fade animation repeated: should never happen."); |
| assert(false); |
| } |
| |
| @Override |
| public void onAnimationStart(Animator animation) { |
| } |
| } |
| } |