| /* |
| * Copyright (C) 2007 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.content.res; |
| |
| import android.graphics.Color; |
| |
| import com.android.internal.util.ArrayUtils; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import android.util.AttributeSet; |
| import android.util.MathUtils; |
| import android.util.SparseArray; |
| import android.util.StateSet; |
| import android.util.Xml; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import java.io.IOException; |
| import java.lang.ref.WeakReference; |
| import java.util.Arrays; |
| |
| /** |
| * |
| * Lets you map {@link android.view.View} state sets to colors. |
| * |
| * {@link android.content.res.ColorStateList}s are created from XML resource files defined in the |
| * "color" subdirectory directory of an application's resource directory. The XML file contains |
| * a single "selector" element with a number of "item" elements inside. For example: |
| * |
| * <pre> |
| * <selector xmlns:android="http://schemas.android.com/apk/res/android"> |
| * <item android:state_focused="true" android:color="@color/testcolor1"/> |
| * <item android:state_pressed="true" android:state_enabled="false" android:color="@color/testcolor2" /> |
| * <item android:state_enabled="false" android:color="@color/testcolor3" /> |
| * <item android:color="@color/testcolor5"/> |
| * </selector> |
| * </pre> |
| * |
| * This defines a set of state spec / color pairs where each state spec specifies a set of |
| * states that a view must either be in or not be in and the color specifies the color associated |
| * with that spec. The list of state specs will be processed in order of the items in the XML file. |
| * An item with no state spec is considered to match any set of states and is generally useful as |
| * a final item to be used as a default. Note that if you have such an item before any other items |
| * in the list then any subsequent items will end up being ignored. |
| * <p>For more information, see the guide to <a |
| * href="{@docRoot}guide/topics/resources/color-list-resource.html">Color State |
| * List Resource</a>.</p> |
| */ |
| public class ColorStateList implements Parcelable { |
| |
| private int[][] mStateSpecs; // must be parallel to mColors |
| private int[] mColors; // must be parallel to mStateSpecs |
| private int mDefaultColor = 0xffff0000; |
| |
| private static final int[][] EMPTY = new int[][] { new int[0] }; |
| private static final SparseArray<WeakReference<ColorStateList>> sCache = |
| new SparseArray<WeakReference<ColorStateList>>(); |
| |
| private ColorStateList() { } |
| |
| /** |
| * Creates a ColorStateList that returns the specified mapping from |
| * states to colors. |
| */ |
| public ColorStateList(int[][] states, int[] colors) { |
| mStateSpecs = states; |
| mColors = colors; |
| |
| if (states.length > 0) { |
| mDefaultColor = colors[0]; |
| |
| for (int i = 0; i < states.length; i++) { |
| if (states[i].length == 0) { |
| mDefaultColor = colors[i]; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Creates or retrieves a ColorStateList that always returns a single color. |
| */ |
| public static ColorStateList valueOf(int color) { |
| // TODO: should we collect these eventually? |
| synchronized (sCache) { |
| WeakReference<ColorStateList> ref = sCache.get(color); |
| ColorStateList csl = ref != null ? ref.get() : null; |
| |
| if (csl != null) { |
| return csl; |
| } |
| |
| csl = new ColorStateList(EMPTY, new int[] { color }); |
| sCache.put(color, new WeakReference<ColorStateList>(csl)); |
| return csl; |
| } |
| } |
| |
| /** |
| * Create a ColorStateList from an XML document, given a set of {@link Resources}. |
| */ |
| public static ColorStateList createFromXml(Resources r, XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| |
| AttributeSet attrs = Xml.asAttributeSet(parser); |
| |
| int type; |
| while ((type=parser.next()) != XmlPullParser.START_TAG |
| && type != XmlPullParser.END_DOCUMENT) { |
| } |
| |
| if (type != XmlPullParser.START_TAG) { |
| throw new XmlPullParserException("No start tag found"); |
| } |
| |
| return createFromXmlInner(r, parser, attrs); |
| } |
| |
| /* Create from inside an XML document. Called on a parser positioned at |
| * a tag in an XML document, tries to create a ColorStateList from that tag. |
| * Returns null if the tag is not a valid ColorStateList. |
| */ |
| private static ColorStateList createFromXmlInner(Resources r, XmlPullParser parser, |
| AttributeSet attrs) throws XmlPullParserException, IOException { |
| |
| ColorStateList colorStateList; |
| |
| final String name = parser.getName(); |
| |
| if (name.equals("selector")) { |
| colorStateList = new ColorStateList(); |
| } else { |
| throw new XmlPullParserException( |
| parser.getPositionDescription() + ": invalid drawable tag " + name); |
| } |
| |
| colorStateList.inflate(r, parser, attrs); |
| return colorStateList; |
| } |
| |
| /** |
| * Creates a new ColorStateList that has the same states and |
| * colors as this one but where each color has the specified alpha value |
| * (0-255). |
| */ |
| public ColorStateList withAlpha(int alpha) { |
| int[] colors = new int[mColors.length]; |
| |
| int len = colors.length; |
| for (int i = 0; i < len; i++) { |
| colors[i] = (mColors[i] & 0xFFFFFF) | (alpha << 24); |
| } |
| |
| return new ColorStateList(mStateSpecs, colors); |
| } |
| |
| /** |
| * Fill in this object based on the contents of an XML "selector" element. |
| */ |
| private void inflate(Resources r, XmlPullParser parser, AttributeSet attrs) |
| throws XmlPullParserException, IOException { |
| |
| int type; |
| |
| final int innerDepth = parser.getDepth()+1; |
| int depth; |
| |
| int listAllocated = 20; |
| int listSize = 0; |
| int[] colorList = new int[listAllocated]; |
| int[][] stateSpecList = new int[listAllocated][]; |
| |
| while ((type=parser.next()) != XmlPullParser.END_DOCUMENT |
| && ((depth=parser.getDepth()) >= innerDepth |
| || type != XmlPullParser.END_TAG)) { |
| if (type != XmlPullParser.START_TAG) { |
| continue; |
| } |
| |
| if (depth > innerDepth || !parser.getName().equals("item")) { |
| continue; |
| } |
| |
| int alphaRes = 0; |
| float alpha = 1.0f; |
| int colorRes = 0; |
| int color = 0xffff0000; |
| boolean haveColor = false; |
| |
| int i; |
| int j = 0; |
| final int numAttrs = attrs.getAttributeCount(); |
| int[] stateSpec = new int[numAttrs]; |
| for (i = 0; i < numAttrs; i++) { |
| final int stateResId = attrs.getAttributeNameResource(i); |
| if (stateResId == 0) break; |
| if (stateResId == com.android.internal.R.attr.alpha) { |
| alphaRes = attrs.getAttributeResourceValue(i, 0); |
| if (alphaRes == 0) { |
| alpha = attrs.getAttributeFloatValue(i, 1.0f); |
| } |
| } else if (stateResId == com.android.internal.R.attr.color) { |
| colorRes = attrs.getAttributeResourceValue(i, 0); |
| if (colorRes == 0) { |
| color = attrs.getAttributeIntValue(i, color); |
| haveColor = true; |
| } |
| } else { |
| stateSpec[j++] = attrs.getAttributeBooleanValue(i, false) |
| ? stateResId : -stateResId; |
| } |
| } |
| stateSpec = StateSet.trimStateSet(stateSpec, j); |
| |
| if (colorRes != 0) { |
| color = r.getColor(colorRes); |
| } else if (!haveColor) { |
| throw new XmlPullParserException( |
| parser.getPositionDescription() |
| + ": <item> tag requires a 'android:color' attribute."); |
| } |
| |
| if (alphaRes != 0) { |
| alpha = r.getFraction(alphaRes, 1, 1); |
| } |
| |
| // Apply alpha modulation. |
| final int alphaMod = MathUtils.constrain((int) (Color.alpha(color) * alpha), 0, 255); |
| color = (color & 0xFFFFFF) | (alphaMod << 24); |
| |
| if (listSize == 0 || stateSpec.length == 0) { |
| mDefaultColor = color; |
| } |
| |
| if (listSize + 1 >= listAllocated) { |
| listAllocated = ArrayUtils.idealIntArraySize(listSize + 1); |
| |
| int[] ncolor = new int[listAllocated]; |
| System.arraycopy(colorList, 0, ncolor, 0, listSize); |
| |
| int[][] nstate = new int[listAllocated][]; |
| System.arraycopy(stateSpecList, 0, nstate, 0, listSize); |
| |
| colorList = ncolor; |
| stateSpecList = nstate; |
| } |
| |
| colorList[listSize] = color; |
| stateSpecList[listSize] = stateSpec; |
| listSize++; |
| } |
| |
| mColors = new int[listSize]; |
| mStateSpecs = new int[listSize][]; |
| System.arraycopy(colorList, 0, mColors, 0, listSize); |
| System.arraycopy(stateSpecList, 0, mStateSpecs, 0, listSize); |
| } |
| |
| public boolean isStateful() { |
| return mStateSpecs.length > 1; |
| } |
| |
| public boolean isOpaque() { |
| final int n = mColors.length; |
| for (int i = 0; i < n; i++) { |
| if (Color.alpha(mColors[i]) != 0xFF) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Return the color associated with the given set of {@link android.view.View} states. |
| * |
| * @param stateSet an array of {@link android.view.View} states |
| * @param defaultColor the color to return if there's not state spec in this |
| * {@link ColorStateList} that matches the stateSet. |
| * |
| * @return the color associated with that set of states in this {@link ColorStateList}. |
| */ |
| public int getColorForState(int[] stateSet, int defaultColor) { |
| final int setLength = mStateSpecs.length; |
| for (int i = 0; i < setLength; i++) { |
| int[] stateSpec = mStateSpecs[i]; |
| if (StateSet.stateSetMatches(stateSpec, stateSet)) { |
| return mColors[i]; |
| } |
| } |
| return defaultColor; |
| } |
| |
| /** |
| * Return the default color in this {@link ColorStateList}. |
| * |
| * @return the default color in this {@link ColorStateList}. |
| */ |
| public int getDefaultColor() { |
| return mDefaultColor; |
| } |
| |
| /** |
| * Return the states in this {@link ColorStateList}. |
| * @return the states in this {@link ColorStateList} |
| * @hide |
| */ |
| public int[][] getStates() { |
| return mStateSpecs; |
| } |
| |
| /** |
| * Return the colors in this {@link ColorStateList}. |
| * @return the colors in this {@link ColorStateList} |
| * @hide |
| */ |
| public int[] getColors() { |
| return mColors; |
| } |
| |
| @Override |
| public String toString() { |
| return "ColorStateList{" + |
| "mStateSpecs=" + Arrays.deepToString(mStateSpecs) + |
| "mColors=" + Arrays.toString(mColors) + |
| "mDefaultColor=" + mDefaultColor + '}'; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| final int N = mStateSpecs.length; |
| dest.writeInt(N); |
| for (int i = 0; i < N; i++) { |
| dest.writeIntArray(mStateSpecs[i]); |
| } |
| dest.writeIntArray(mColors); |
| } |
| |
| public static final Parcelable.Creator<ColorStateList> CREATOR = |
| new Parcelable.Creator<ColorStateList>() { |
| @Override |
| public ColorStateList[] newArray(int size) { |
| return new ColorStateList[size]; |
| } |
| |
| @Override |
| public ColorStateList createFromParcel(Parcel source) { |
| final int N = source.readInt(); |
| final int[][] stateSpecs = new int[N][]; |
| for (int i = 0; i < N; i++) { |
| stateSpecs[i] = source.createIntArray(); |
| } |
| final int[] colors = source.createIntArray(); |
| return new ColorStateList(stateSpecs, colors); |
| } |
| }; |
| } |