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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 java.util.ArrayList;
/**
* This is the superclass for classes which provide basic support for animations which can be
* started, ended, and have <code>AnimatableListeners</code> added to them.
*/
public abstract class Animatable {
/**
* The set of listeners to be sent events through the life of an animation.
*/
ArrayList<AnimatableListener> mListeners = null;
/**
* Starts this animation. If the animation has a nonzero startDelay, the animation will start
* running after that delay elapses. Note that the animation does not start synchronously with
* this call, because all animation events are posted to a central timing loop so that animation
* times are all synchronized on a single timing pulse on the UI thread. So the animation will
* start the next time that event handler processes events.
*/
public void start() {
}
/**
* Cancels the animation. Unlike {@link #end()}, <code>cancel()</code> causes the animation to
* stop in its tracks, sending an {@link AnimatableListener#onAnimationCancel(Animatable)} to
* its listeners, followed by an {@link AnimatableListener#onAnimationEnd(Animatable)} message.
*/
public void cancel() {
}
/**
* Ends the animation. This causes the animation to assign the end value of the property being
* animated, then calling the {@link AnimatableListener#onAnimationEnd(Animatable)} method on
* its listeners.
*/
public void end() {
}
/**
* Adds a listener to the set of listeners that are sent events through the life of an
* animation, such as start, repeat, and end.
*
* @param listener the listener to be added to the current set of listeners for this animation.
*/
public void addListener(AnimatableListener listener) {
if (mListeners == null) {
mListeners = new ArrayList<AnimatableListener>();
}
mListeners.add(listener);
}
/**
* Removes a listener from the set listening to this animation.
*
* @param listener the listener to be removed from the current set of listeners for this
* animation.
*/
public void removeListener(AnimatableListener listener) {
if (mListeners == null) {
return;
}
mListeners.remove(listener);
if (mListeners.size() == 0) {
mListeners = null;
}
}
/**
* Gets the set of {@link AnimatableListener} objects that are currently
* listening for events on this <code>Animatable</code> object.
*
* @return ArrayList<AnimatableListener> The set of listeners.
*/
public ArrayList<AnimatableListener> getListeners() {
return mListeners;
}
/**
* Removes all listeners from this object. This is equivalent to calling
* <code>getListeners()</code> followed by calling <code>clear()</code> on the
* returned list of listeners.
*/
public void removeAllListeners() {
if (mListeners != null) {
mListeners.clear();
mListeners = null;
}
}
/**
* <p>An animation listener receives notifications from an animation.
* Notifications indicate animation related events, such as the end or the
* repetition of the animation.</p>
*/
public static interface AnimatableListener {
/**
* <p>Notifies the start of the animation.</p>
*
* @param animation The started animation.
*/
void onAnimationStart(Animatable animation);
/**
* <p>Notifies the end of the animation. This callback is not invoked
* for animations with repeat count set to INFINITE.</p>
*
* @param animation The animation which reached its end.
*/
void onAnimationEnd(Animatable animation);
/**
* <p>Notifies the cancellation of the animation. This callback is not invoked
* for animations with repeat count set to INFINITE.</p>
*
* @param animation The animation which was canceled.
*/
void onAnimationCancel(Animatable animation);
/**
* <p>Notifies the repetition of the animation.</p>
*
* @param animation The animation which was repeated.
*/
void onAnimationRepeat(Animatable animation);
}
}
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