/*
* Copyright (C) 2013 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.transition;
import android.animation.TimeInterpolator;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AndroidRuntimeException;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import com.android.internal.R;
import java.util.ArrayList;
/**
* A TransitionSet is a parent of child transitions (including other
* TransitionSets). Using TransitionSets enables more complex
* choreography of transitions, where some sets play {@link #ORDERING_TOGETHER} and
* others play {@link #ORDERING_SEQUENTIAL}. For example, {@link AutoTransition}
* uses a TransitionSet to sequentially play a Fade(Fade.OUT), followed by
* a {@link ChangeBounds}, followed by a Fade(Fade.OUT) transition.
*
* <p>A TransitionSet can be described in a resource file by using the
* tag <code>transitionSet</code>, along with the standard
* attributes of {@link android.R.styleable#TransitionSet} and
* {@link android.R.styleable#Transition}. Child transitions of the
* TransitionSet object can be loaded by adding those child tags inside the
* enclosing <code>transitionSet</code> tag. For example, the following xml
* describes a TransitionSet that plays a Fade and then a ChangeBounds
* transition on the affected view targets:</p>
* <pre>
* <transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
* android:transitionOrdering="sequential">
* <fade/>
* <changeBounds/>
* </transitionSet>
* </pre>
*/
public class TransitionSet extends Transition {
ArrayList<Transition> mTransitions = new ArrayList<Transition>();
private boolean mPlayTogether = true;
int mCurrentListeners;
boolean mStarted = false;
/**
* A flag used to indicate that the child transitions of this set
* should all start at the same time.
*/
public static final int ORDERING_TOGETHER = 0;
/**
* A flag used to indicate that the child transitions of this set should
* play in sequence; when one child transition ends, the next child
* transition begins. Note that a transition does not end until all
* instances of it (which are playing on all applicable targets of the
* transition) end.
*/
public static final int ORDERING_SEQUENTIAL = 1;
/**
* Constructs an empty transition set. Add child transitions to the
* set by calling {@link #addTransition(Transition)} )}. By default,
* child transitions will play {@link #ORDERING_TOGETHER together}.
*/
public TransitionSet() {
}
public TransitionSet(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TransitionSet);
int ordering = a.getInt(R.styleable.TransitionSet_transitionOrdering,
TransitionSet.ORDERING_TOGETHER);
setOrdering(ordering);
a.recycle();
}
/**
* Sets the play order of this set's child transitions.
*
* @param ordering {@link #ORDERING_TOGETHER} to play this set's child
* transitions together, {@link #ORDERING_SEQUENTIAL} to play the child
* transitions in sequence.
* @return This transitionSet object.
*/
public TransitionSet setOrdering(int ordering) {
switch (ordering) {
case ORDERING_SEQUENTIAL:
mPlayTogether = false;
break;
case ORDERING_TOGETHER:
mPlayTogether = true;
break;
default:
throw new AndroidRuntimeException("Invalid parameter for TransitionSet " +
"ordering: " + ordering);
}
return this;
}
/**
* Returns the ordering of this TransitionSet. By default, the value is
* {@link #ORDERING_TOGETHER}.
*
* @return {@link #ORDERING_TOGETHER} if child transitions will play at the same
* time, {@link #ORDERING_SEQUENTIAL} if they will play in sequence.
*
* @see #setOrdering(int)
*/
public int getOrdering() {
return mPlayTogether ? ORDERING_TOGETHER : ORDERING_SEQUENTIAL;
}
/**
* Adds child transition to this set. The order in which this child transition
* is added relative to other child transitions that are added, in addition to
* the {@link #getOrdering() ordering} property, determines the
* order in which the transitions are started.
*
* <p>If this transitionSet has a {@link #getDuration() duration} set on it, the
* child transition will inherit that duration. Transitions are assumed to have
* a maximum of one transitionSet parent.</p>
*
* @param transition A non-null child transition to be added to this set.
* @return This transitionSet object.
*/
public TransitionSet addTransition(Transition transition) {
if (transition != null) {
mTransitions.add(transition);
transition.mParent = this;
if (mDuration >= 0) {
transition.setDuration(mDuration);
}
}
return this;
}
/**
* Returns the number of child transitions in the TransitionSet.
*
* @return The number of child transitions in the TransitionSet.
* @see #addTransition(Transition)
* @see #getTransitionAt(int)
*/
public int getTransitionCount() {
return mTransitions.size();
}
/**
* Returns the child Transition at the specified position in the TransitionSet.
*
* @param index The position of the Transition to retrieve.
* @see #addTransition(Transition)
* @see #getTransitionCount()
*/
public Transition getTransitionAt(int index) {
if (index < 0 || index >= mTransitions.size()) {
return null;
}
return mTransitions.get(index);
}
/**
* Setting a non-negative duration on a TransitionSet causes all of the child
* transitions (current and future) to inherit this duration.
*
* @param duration The length of the animation, in milliseconds.
* @return This transitionSet object.
*/
@Override
public TransitionSet setDuration(long duration) {
super.setDuration(duration);
if (mDuration >= 0 && mTransitions != null) {
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).setDuration(duration);
}
}
return this;
}
@Override
public TransitionSet setStartDelay(long startDelay) {
return (TransitionSet) super.setStartDelay(startDelay);
}
@Override
public TransitionSet setInterpolator(TimeInterpolator interpolator) {
return (TransitionSet) super.setInterpolator(interpolator);
}
@Override
public TransitionSet addTarget(View target) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).addTarget(target);
}
return (TransitionSet) super.addTarget(target);
}
@Override
public TransitionSet addTarget(int targetId) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).addTarget(targetId);
}
return (TransitionSet) super.addTarget(targetId);
}
@Override
public TransitionSet addTarget(String targetName) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).addTarget(targetName);
}
return (TransitionSet) super.addTarget(targetName);
}
@Override
public TransitionSet addTarget(Class targetType) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).addTarget(targetType);
}
return (TransitionSet) super.addTarget(targetType);
}
@Override
public TransitionSet addListener(TransitionListener listener) {
return (TransitionSet) super.addListener(listener);
}
@Override
public TransitionSet removeTarget(int targetId) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).removeTarget(targetId);
}
return (TransitionSet) super.removeTarget(targetId);
}
@Override
public TransitionSet removeTarget(View target) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).removeTarget(target);
}
return (TransitionSet) super.removeTarget(target);
}
@Override
public TransitionSet removeTarget(Class target) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).removeTarget(target);
}
return (TransitionSet) super.removeTarget(target);
}
@Override
public TransitionSet removeTarget(String target) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).removeTarget(target);
}
return (TransitionSet) super.removeTarget(target);
}
@Override
public Transition excludeTarget(View target, boolean exclude) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).excludeTarget(target, exclude);
}
return super.excludeTarget(target, exclude);
}
@Override
public Transition excludeTarget(String targetName, boolean exclude) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).excludeTarget(targetName, exclude);
}
return super.excludeTarget(targetName, exclude);
}
@Override
public Transition excludeTarget(int targetId, boolean exclude) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).excludeTarget(targetId, exclude);
}
return super.excludeTarget(targetId, exclude);
}
@Override
public Transition excludeTarget(Class type, boolean exclude) {
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).excludeTarget(type, exclude);
}
return super.excludeTarget(type, exclude);
}
@Override
public TransitionSet removeListener(TransitionListener listener) {
return (TransitionSet) super.removeListener(listener);
}
@Override
public void setPathMotion(PathMotion pathMotion) {
super.setPathMotion(pathMotion);
for (int i = 0; i < mTransitions.size(); i++) {
mTransitions.get(i).setPathMotion(pathMotion);
}
}
/**
* Removes the specified child transition from this set.
*
* @param transition The transition to be removed.
* @return This transitionSet object.
*/
public TransitionSet removeTransition(Transition transition) {
mTransitions.remove(transition);
transition.mParent = null;
return this;
}
/**
* Sets up listeners for each of the child transitions. This is used to
* determine when this transition set is finished (all child transitions
* must finish first).
*/
private void setupStartEndListeners() {
TransitionSetListener listener = new TransitionSetListener(this);
for (Transition childTransition : mTransitions) {
childTransition.addListener(listener);
}
mCurrentListeners = mTransitions.size();
}
/**
* This listener is used to detect when all child transitions are done, at
* which point this transition set is also done.
*/
static class TransitionSetListener extends TransitionListenerAdapter {
TransitionSet mTransitionSet;
TransitionSetListener(TransitionSet transitionSet) {
mTransitionSet = transitionSet;
}
@Override
public void onTransitionStart(Transition transition) {
if (!mTransitionSet.mStarted) {
mTransitionSet.start();
mTransitionSet.mStarted = true;
}
}
@Override
public void onTransitionEnd(Transition transition) {
--mTransitionSet.mCurrentListeners;
if (mTransitionSet.mCurrentListeners == 0) {
// All child trans
mTransitionSet.mStarted = false;
mTransitionSet.end();
}
transition.removeListener(this);
}
}
/**
* @hide
*/
@Override
protected void createAnimators(ViewGroup sceneRoot, TransitionValuesMaps startValues,
TransitionValuesMaps endValues, ArrayList<TransitionValues> startValuesList,
ArrayList<TransitionValues> endValuesList) {
long startDelay = getStartDelay();
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; i++) {
Transition childTransition = mTransitions.get(i);
// We only set the start delay on the first transition if we are playing
// the transitions sequentially.
if (startDelay > 0 && (mPlayTogether || i == 0)) {
long childStartDelay = childTransition.getStartDelay();
if (childStartDelay > 0) {
childTransition.setStartDelay(startDelay + childStartDelay);
} else {
childTransition.setStartDelay(startDelay);
}
}
childTransition.createAnimators(sceneRoot, startValues, endValues, startValuesList,
endValuesList);
}
}
/**
* @hide
*/
@Override
protected void runAnimators() {
if (mTransitions.isEmpty()) {
start();
end();
return;
}
setupStartEndListeners();
int numTransitions = mTransitions.size();
if (!mPlayTogether) {
// Setup sequence with listeners
// TODO: Need to add listeners in such a way that we can remove them later if canceled
for (int i = 1; i < numTransitions; ++i) {
Transition previousTransition = mTransitions.get(i - 1);
final Transition nextTransition = mTransitions.get(i);
previousTransition.addListener(new TransitionListenerAdapter() {
@Override
public void onTransitionEnd(Transition transition) {
nextTransition.runAnimators();
transition.removeListener(this);
}
});
}
Transition firstTransition = mTransitions.get(0);
if (firstTransition != null) {
firstTransition.runAnimators();
}
} else {
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).runAnimators();
}
}
}
@Override
public void captureStartValues(TransitionValues transitionValues) {
if (isValidTarget(transitionValues.view)) {
for (Transition childTransition : mTransitions) {
if (childTransition.isValidTarget(transitionValues.view)) {
childTransition.captureStartValues(transitionValues);
transitionValues.targetedTransitions.add(childTransition);
}
}
}
}
@Override
public void captureEndValues(TransitionValues transitionValues) {
if (isValidTarget(transitionValues.view)) {
for (Transition childTransition : mTransitions) {
if (childTransition.isValidTarget(transitionValues.view)) {
childTransition.captureEndValues(transitionValues);
transitionValues.targetedTransitions.add(childTransition);
}
}
}
}
@Override
void capturePropagationValues(TransitionValues transitionValues) {
super.capturePropagationValues(transitionValues);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).capturePropagationValues(transitionValues);
}
}
/** @hide */
@Override
public void pause(View sceneRoot) {
super.pause(sceneRoot);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).pause(sceneRoot);
}
}
/** @hide */
@Override
public void resume(View sceneRoot) {
super.resume(sceneRoot);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).resume(sceneRoot);
}
}
/** @hide */
@Override
protected void cancel() {
super.cancel();
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).cancel();
}
}
/** @hide */
@Override
void forceToEnd(ViewGroup sceneRoot) {
super.forceToEnd(sceneRoot);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).forceToEnd(sceneRoot);
}
}
@Override
TransitionSet setSceneRoot(ViewGroup sceneRoot) {
super.setSceneRoot(sceneRoot);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).setSceneRoot(sceneRoot);
}
return (TransitionSet) this;
}
@Override
void setCanRemoveViews(boolean canRemoveViews) {
super.setCanRemoveViews(canRemoveViews);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).setCanRemoveViews(canRemoveViews);
}
}
@Override
public void setPropagation(TransitionPropagation propagation) {
super.setPropagation(propagation);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).setPropagation(propagation);
}
}
@Override
public void setEpicenterCallback(EpicenterCallback epicenterCallback) {
super.setEpicenterCallback(epicenterCallback);
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
mTransitions.get(i).setEpicenterCallback(epicenterCallback);
}
}
@Override
String toString(String indent) {
String result = super.toString(indent);
for (int i = 0; i < mTransitions.size(); ++i) {
result += "\n" + mTransitions.get(i).toString(indent + " ");
}
return result;
}
@Override
public TransitionSet clone() {
TransitionSet clone = (TransitionSet) super.clone();
clone.mTransitions = new ArrayList<Transition>();
int numTransitions = mTransitions.size();
for (int i = 0; i < numTransitions; ++i) {
clone.addTransition((Transition) mTransitions.get(i).clone());
}
return clone;
}
}