| /* |
| * 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.graphics.drawable; |
| |
| import com.android.internal.R; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| import android.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.content.res.Resources.Theme; |
| import android.util.AttributeSet; |
| import android.util.StateSet; |
| |
| /** |
| * Lets you assign a number of graphic images to a single Drawable and swap out the visible item by a string |
| * ID value. |
| * <p/> |
| * <p>It can be defined in an XML file with the <code><selector></code> element. |
| * Each state Drawable is defined in a nested <code><item></code> element. For more |
| * information, see the guide to <a |
| * href="{@docRoot}guide/topics/resources/drawable-resource.html">Drawable Resources</a>.</p> |
| * |
| * @attr ref android.R.styleable#StateListDrawable_visible |
| * @attr ref android.R.styleable#StateListDrawable_variablePadding |
| * @attr ref android.R.styleable#StateListDrawable_constantSize |
| * @attr ref android.R.styleable#DrawableStates_state_focused |
| * @attr ref android.R.styleable#DrawableStates_state_window_focused |
| * @attr ref android.R.styleable#DrawableStates_state_enabled |
| * @attr ref android.R.styleable#DrawableStates_state_checkable |
| * @attr ref android.R.styleable#DrawableStates_state_checked |
| * @attr ref android.R.styleable#DrawableStates_state_selected |
| * @attr ref android.R.styleable#DrawableStates_state_activated |
| * @attr ref android.R.styleable#DrawableStates_state_active |
| * @attr ref android.R.styleable#DrawableStates_state_single |
| * @attr ref android.R.styleable#DrawableStates_state_first |
| * @attr ref android.R.styleable#DrawableStates_state_middle |
| * @attr ref android.R.styleable#DrawableStates_state_last |
| * @attr ref android.R.styleable#DrawableStates_state_pressed |
| */ |
| public class StateListDrawable extends DrawableContainer { |
| private static final String TAG = StateListDrawable.class.getSimpleName(); |
| |
| private static final boolean DEBUG = false; |
| |
| /** |
| * To be proper, we should have a getter for dither (and alpha, etc.) |
| * so that proxy classes like this can save/restore their delegates' |
| * values, but we don't have getters. Since we do have setters |
| * (e.g. setDither), which this proxy forwards on, we have to have some |
| * default/initial setting. |
| * |
| * The initial setting for dither is now true, since it almost always seems |
| * to improve the quality at negligible cost. |
| */ |
| private static final boolean DEFAULT_DITHER = true; |
| |
| private StateListState mStateListState; |
| private boolean mMutated; |
| |
| public StateListDrawable() { |
| this(null, null); |
| } |
| |
| /** |
| * Add a new image/string ID to the set of images. |
| * |
| * @param stateSet - An array of resource Ids to associate with the image. |
| * Switch to this image by calling setState(). |
| * @param drawable -The image to show. |
| */ |
| public void addState(int[] stateSet, Drawable drawable) { |
| if (drawable != null) { |
| mStateListState.addStateSet(stateSet, drawable); |
| // in case the new state matches our current state... |
| onStateChange(getState()); |
| } |
| } |
| |
| @Override |
| public boolean isStateful() { |
| return true; |
| } |
| |
| @Override |
| protected boolean onStateChange(int[] stateSet) { |
| int idx = mStateListState.indexOfStateSet(stateSet); |
| if (DEBUG) android.util.Log.i(TAG, "onStateChange " + this + " states " |
| + Arrays.toString(stateSet) + " found " + idx); |
| if (idx < 0) { |
| idx = mStateListState.indexOfStateSet(StateSet.WILD_CARD); |
| } |
| if (selectDrawable(idx)) { |
| return true; |
| } |
| return super.onStateChange(stateSet); |
| } |
| |
| @Override |
| public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Theme theme) |
| throws XmlPullParserException, IOException { |
| |
| final TypedArray a = obtainAttributes(r, theme, attrs, R.styleable.StateListDrawable); |
| |
| super.inflateWithAttributes(r, parser, a, |
| R.styleable.StateListDrawable_visible); |
| |
| mStateListState.setVariablePadding(a.getBoolean( |
| R.styleable.StateListDrawable_variablePadding, false)); |
| mStateListState.setConstantSize(a.getBoolean( |
| R.styleable.StateListDrawable_constantSize, false)); |
| mStateListState.setEnterFadeDuration(a.getInt( |
| R.styleable.StateListDrawable_enterFadeDuration, 0)); |
| mStateListState.setExitFadeDuration(a.getInt( |
| R.styleable.StateListDrawable_exitFadeDuration, 0)); |
| |
| setDither(a.getBoolean(R.styleable.StateListDrawable_dither, DEFAULT_DITHER)); |
| setAutoMirrored(a.getBoolean(R.styleable.StateListDrawable_autoMirrored, false)); |
| |
| a.recycle(); |
| |
| final int innerDepth = parser.getDepth() + 1; |
| int type; |
| int depth; |
| 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 drawableRes = 0; |
| |
| int i; |
| int j = 0; |
| final int numAttrs = attrs.getAttributeCount(); |
| int[] states = new int[numAttrs]; |
| for (i = 0; i < numAttrs; i++) { |
| final int stateResId = attrs.getAttributeNameResource(i); |
| if (stateResId == 0) break; |
| if (stateResId == R.attr.drawable) { |
| drawableRes = attrs.getAttributeResourceValue(i, 0); |
| } else { |
| states[j++] = attrs.getAttributeBooleanValue(i, false) |
| ? stateResId |
| : -stateResId; |
| } |
| } |
| states = StateSet.trimStateSet(states, j); |
| |
| final Drawable dr; |
| if (drawableRes != 0) { |
| dr = r.getDrawable(drawableRes, theme); |
| } else { |
| while ((type = parser.next()) == XmlPullParser.TEXT) { |
| } |
| if (type != XmlPullParser.START_TAG) { |
| throw new XmlPullParserException( |
| parser.getPositionDescription() |
| + ": <item> tag requires a 'drawable' attribute or " |
| + "child tag defining a drawable"); |
| } |
| dr = Drawable.createFromXmlInner(r, parser, attrs, theme); |
| } |
| |
| mStateListState.addStateSet(states, dr); |
| } |
| |
| onStateChange(getState()); |
| } |
| |
| StateListState getStateListState() { |
| return mStateListState; |
| } |
| |
| /** |
| * Gets the number of states contained in this drawable. |
| * |
| * @return The number of states contained in this drawable. |
| * @hide pending API council |
| * @see #getStateSet(int) |
| * @see #getStateDrawable(int) |
| */ |
| public int getStateCount() { |
| return mStateListState.getChildCount(); |
| } |
| |
| /** |
| * Gets the state set at an index. |
| * |
| * @param index The index of the state set. |
| * @return The state set at the index. |
| * @hide pending API council |
| * @see #getStateCount() |
| * @see #getStateDrawable(int) |
| */ |
| public int[] getStateSet(int index) { |
| return mStateListState.mStateSets[index]; |
| } |
| |
| /** |
| * Gets the drawable at an index. |
| * |
| * @param index The index of the drawable. |
| * @return The drawable at the index. |
| * @hide pending API council |
| * @see #getStateCount() |
| * @see #getStateSet(int) |
| */ |
| public Drawable getStateDrawable(int index) { |
| return mStateListState.getChild(index); |
| } |
| |
| /** |
| * Gets the index of the drawable with the provided state set. |
| * |
| * @param stateSet the state set to look up |
| * @return the index of the provided state set, or -1 if not found |
| * @hide pending API council |
| * @see #getStateDrawable(int) |
| * @see #getStateSet(int) |
| */ |
| public int getStateDrawableIndex(int[] stateSet) { |
| return mStateListState.indexOfStateSet(stateSet); |
| } |
| |
| @Override |
| public Drawable mutate() { |
| if (!mMutated && super.mutate() == this) { |
| final int[][] sets = mStateListState.mStateSets; |
| final int count = sets.length; |
| mStateListState.mStateSets = new int[count][]; |
| for (int i = 0; i < count; i++) { |
| final int[] set = sets[i]; |
| if (set != null) { |
| mStateListState.mStateSets[i] = set.clone(); |
| } |
| } |
| mMutated = true; |
| } |
| return this; |
| } |
| |
| /** @hide */ |
| @Override |
| public void setLayoutDirection(int layoutDirection) { |
| super.setLayoutDirection(layoutDirection); |
| |
| // Let the container handle setting its own layout direction. Otherwise, |
| // we're accessing potentially unused states. |
| mStateListState.setLayoutDirection(layoutDirection); |
| } |
| |
| static class StateListState extends DrawableContainerState { |
| int[][] mStateSets; |
| |
| StateListState(StateListState orig, StateListDrawable owner, Resources res) { |
| super(orig, owner, res); |
| |
| if (orig != null) { |
| mStateSets = Arrays.copyOf(orig.mStateSets, orig.mStateSets.length); |
| } else { |
| mStateSets = new int[getCapacity()][]; |
| } |
| } |
| |
| int addStateSet(int[] stateSet, Drawable drawable) { |
| final int pos = addChild(drawable); |
| mStateSets[pos] = stateSet; |
| return pos; |
| } |
| |
| int indexOfStateSet(int[] stateSet) { |
| final int[][] stateSets = mStateSets; |
| final int N = getChildCount(); |
| for (int i = 0; i < N; i++) { |
| if (StateSet.stateSetMatches(stateSets[i], stateSet)) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| @Override |
| public Drawable newDrawable() { |
| return new StateListDrawable(this, null); |
| } |
| |
| @Override |
| public Drawable newDrawable(Resources res) { |
| return new StateListDrawable(this, res); |
| } |
| |
| @Override |
| public void growArray(int oldSize, int newSize) { |
| super.growArray(oldSize, newSize); |
| final int[][] newStateSets = new int[newSize][]; |
| System.arraycopy(mStateSets, 0, newStateSets, 0, oldSize); |
| mStateSets = newStateSets; |
| } |
| } |
| |
| void setConstantState(StateListState state) { |
| super.setConstantState(state); |
| |
| mStateListState = state; |
| } |
| |
| private StateListDrawable(StateListState state, Resources res) { |
| final StateListState newState = new StateListState(state, this, res); |
| setConstantState(newState); |
| onStateChange(getState()); |
| } |
| |
| /** |
| * This constructor exists so subclasses can avoid calling the default |
| * constructor and setting up a StateListDrawable-specific constant state. |
| */ |
| StateListDrawable(StateListState state) { |
| if (state != null) { |
| setConstantState(state); |
| } |
| } |
| } |
| |
