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/*
* Copyright (C) 2010 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.animation;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.content.res.Resources.NotFoundException;
import android.util.AttributeSet;
import android.util.Xml;
import android.view.animation.AnimationUtils;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.util.ArrayList;
/**
* This class is used to instantiate menu XML files into Animatable objects.
* <p>
* For performance reasons, menu inflation relies heavily on pre-processing of
* XML files that is done at build time. Therefore, it is not currently possible
* to use MenuInflater with an XmlPullParser over a plain XML file at runtime;
* it only works with an XmlPullParser returned from a compiled resource (R.
* <em>something</em> file.)
*/
public class AnimatableInflater {
/**
* These flags are used when parsing Sequencer objects
*/
private static final int TOGETHER = 0;
private static final int SEQUENTIALLY = 1;
/**
* Enum values used in XML attributes to indicate the value for mValueType
*/
private static final int VALUE_TYPE_FLOAT = 0;
private static final int VALUE_TYPE_INT = 1;
private static final int VALUE_TYPE_DOUBLE = 2;
private static final int VALUE_TYPE_COLOR = 3;
private static final int VALUE_TYPE_CUSTOM = 4;
/**
* Loads an {@link Animatable} object from a resource
*
* @param context Application context used to access resources
* @param id The resource id of the animation to load
* @return The animatable object reference by the specified id
* @throws android.content.res.Resources.NotFoundException when the animation cannot be loaded
*/
public static Animatable loadAnimatable(Context context, int id)
throws NotFoundException {
XmlResourceParser parser = null;
try {
parser = context.getResources().getAnimation(id);
return createAnimatableFromXml(context, parser);
} catch (XmlPullParserException ex) {
Resources.NotFoundException rnf =
new Resources.NotFoundException("Can't load animation resource ID #0x" +
Integer.toHexString(id));
rnf.initCause(ex);
throw rnf;
} catch (IOException ex) {
Resources.NotFoundException rnf =
new Resources.NotFoundException("Can't load animation resource ID #0x" +
Integer.toHexString(id));
rnf.initCause(ex);
throw rnf;
} finally {
if (parser != null) parser.close();
}
}
private static Animatable createAnimatableFromXml(Context c, XmlPullParser parser)
throws XmlPullParserException, IOException {
return createAnimatableFromXml(c, parser, Xml.asAttributeSet(parser), null, 0);
}
private static Animatable createAnimatableFromXml(Context c, XmlPullParser parser,
AttributeSet attrs, Sequencer parent, int sequenceOrdering)
throws XmlPullParserException, IOException {
Animatable anim = null;
ArrayList<Animatable> childAnims = null;
// Make sure we are on a start tag.
int type;
int depth = parser.getDepth();
while (((type=parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth)
&& type != XmlPullParser.END_DOCUMENT) {
if (type != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("property")) {
anim = loadPropertyAnimator(c, attrs);
} else if (name.equals("animator")) {
anim = loadAnimator(c, attrs, null);
} else if (name.equals("sequencer")) {
anim = new Sequencer();
TypedArray a = c.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.Sequencer);
int ordering = a.getInt(com.android.internal.R.styleable.Sequencer_ordering,
TOGETHER);
createAnimatableFromXml(c, parser, attrs, (Sequencer) anim, ordering);
a.recycle();
} else {
throw new RuntimeException("Unknown animator name: " + parser.getName());
}
if (parent != null) {
if (childAnims == null) {
childAnims = new ArrayList<Animatable>();
}
childAnims.add(anim);
}
}
if (parent != null && childAnims != null) {
Animatable[] animsArray = new Animatable[childAnims.size()];
int index = 0;
for (Animatable a : childAnims) {
animsArray[index++] = a;
}
if (sequenceOrdering == TOGETHER) {
parent.playTogether(animsArray);
} else {
parent.playSequentially(animsArray);
}
}
return anim;
}
private static PropertyAnimator loadPropertyAnimator(Context context, AttributeSet attrs)
throws NotFoundException {
PropertyAnimator anim = new PropertyAnimator();
loadAnimator(context, attrs, anim);
TypedArray a =
context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.PropertyAnimator);
String propertyName = a.getString(com.android.internal.R.styleable.PropertyAnimator_propertyName);
anim.setPropertyName(propertyName);
a.recycle();
return anim;
}
/**
* Creates a new animation whose parameters come from the specified context and
* attributes set.
*
* @param context the application environment
* @param attrs the set of attributes holding the animation parameters
*/
private static Animator loadAnimator(Context context, AttributeSet attrs, Animator anim)
throws NotFoundException {
TypedArray a =
context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.Animator);
long duration = a.getInt(com.android.internal.R.styleable.Animator_duration, 0);
long startDelay = a.getInt(com.android.internal.R.styleable.Animator_startOffset, 0);
int valueType = a.getInt(com.android.internal.R.styleable.Animator_valueType,
VALUE_TYPE_FLOAT);
Object valueFrom = null;
Object valueTo = null;
TypeEvaluator evaluator = null;
switch (valueType) {
case VALUE_TYPE_FLOAT:
if (a.hasValue(com.android.internal.R.styleable.Animator_valueFrom)) {
valueFrom = a.getFloat(com.android.internal.R.styleable.Animator_valueFrom, 0f);
}
if (a.hasValue(com.android.internal.R.styleable.Animator_valueTo)) {
valueTo = a.getFloat(com.android.internal.R.styleable.Animator_valueTo, 0f);
}
break;
case VALUE_TYPE_COLOR:
evaluator = new RGBEvaluator();
// fall through to pick up values
case VALUE_TYPE_INT:
if (a.hasValue(com.android.internal.R.styleable.Animator_valueFrom)) {
valueFrom = a.getInteger(com.android.internal.R.styleable.Animator_valueFrom, 0);
}
if (a.hasValue(com.android.internal.R.styleable.Animator_valueTo)) {
valueTo = a.getInteger(com.android.internal.R.styleable.Animator_valueTo, 0);
}
break;
case VALUE_TYPE_DOUBLE:
if (a.hasValue(com.android.internal.R.styleable.Animator_valueFrom)) {
valueFrom = (Double)((Float)(a.getFloat(com.android.internal.R.styleable.Animator_valueFrom, 0f))).doubleValue();
}
if (a.hasValue(com.android.internal.R.styleable.Animator_valueTo)) {
valueTo = (Double)((Float)a.getFloat(com.android.internal.R.styleable.Animator_valueTo, 0f)).doubleValue();
}
break;
case VALUE_TYPE_CUSTOM:
// TODO: How to get an 'Object' value?
if (a.hasValue(com.android.internal.R.styleable.Animator_valueFrom)) {
valueFrom = a.getFloat(com.android.internal.R.styleable.Animator_valueFrom, 0f);
}
if (a.hasValue(com.android.internal.R.styleable.Animator_valueTo)) {
valueTo = a.getFloat(com.android.internal.R.styleable.Animator_valueTo, 0f);
}
break;
}
if (anim == null) {
anim = new Animator(duration, valueFrom, valueTo);
} else {
anim.setDuration(duration);
anim.setValues(valueFrom, valueTo);
}
anim.setStartDelay(startDelay);
if (a.hasValue(com.android.internal.R.styleable.Animator_repeatCount)) {
anim.setRepeatCount(
a.getInt(com.android.internal.R.styleable.Animator_repeatCount, 0));
}
if (a.hasValue(com.android.internal.R.styleable.Animator_repeatMode)) {
anim.setRepeatMode(
a.getInt(com.android.internal.R.styleable.Animator_repeatMode,
Animator.RESTART));
}
if (evaluator != null) {
anim.setEvaluator(evaluator);
}
final int resID =
a.getResourceId(com.android.internal.R.styleable.Animator_interpolator, 0);
if (resID > 0) {
anim.setInterpolator(AnimationUtils.loadInterpolator(context, resID));
}
a.recycle();
return anim;
}
}
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