/*
* 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 org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import android.content.res.Resources;
import android.content.res.TypedArray;
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.</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_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 final StateListState mStateListState;
private boolean mMutated;
public StateListDrawable() {
this(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 (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)
throws XmlPullParserException, IOException {
TypedArray a = r.obtainAttributes(attrs,
com.android.internal.R.styleable.StateListDrawable);
super.inflateWithAttributes(r, parser, a,
com.android.internal.R.styleable.StateListDrawable_visible);
mStateListState.setVariablePadding(a.getBoolean(
com.android.internal.R.styleable.StateListDrawable_variablePadding, false));
mStateListState.setConstantSize(a.getBoolean(
com.android.internal.R.styleable.StateListDrawable_constantSize, false));
a.recycle();
int type;
final int innerDepth = parser.getDepth() + 1;
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 == com.android.internal.R.attr.drawable) {
drawableRes = attrs.getAttributeResourceValue(i, 0);
} else {
states[j++] = attrs.getAttributeBooleanValue(i, false)
? stateResId
: -stateResId;
}
}
states = StateSet.trimStateSet(states, j);
Drawable dr;
if (drawableRes != 0) {
dr = r.getDrawable(drawableRes);
} 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);
}
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.getChildren()[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++) {
mStateListState.mStateSets[i] = sets[i].clone();
}
mMutated = true;
}
return this;
}
static final class StateListState extends DrawableContainerState {
private int[][] mStateSets;
StateListState(StateListState orig, StateListDrawable owner) {
super(orig, owner);
if (orig != null) {
mStateSets = orig.mStateSets;
} else {
mStateSets = new int[getChildren().length][];
}
}
int addStateSet(int[] stateSet, Drawable drawable) {
final int pos = addChild(drawable);
mStateSets[pos] = stateSet;
return pos;
}
private 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);
}
@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;
}
}
private StateListDrawable(StateListState state) {
StateListState as = new StateListState(state, this);
mStateListState = as;
setConstantState(as);
onStateChange(getState());
}
}