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/*
* Copyright (c) 2001-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.animation;
import java.util.LinkedList;
import java.util.List;
/**
* An abstract class that minimizes the effort required to implement
* the {@link Animation} interface. Defines the duration and freezed state
* and provides a listener list.
*
* @author Karsten Lentzsch
* @version $Revision: 1.8 $
*/
public abstract class AbstractAnimation implements Animation {
private final long duration;
private final boolean freezed;
private final List listenerList = new LinkedList();
private boolean active = false;
// Instance Creation *****************************************************
/**
* Constructs an {@code Animation} with the specified duration.
*
* @param duration the animation's duration
*/
protected AbstractAnimation(long duration) {
this(duration, false);
}
/**
* Constructs an {@code Animation} with the specified duration
* and freezed mode.
*
* @param duration the animation's duration
* @param freezed true indicates that the effect will be retained after
* the animation is finished, false resets the effect to the time 0
*/
protected AbstractAnimation(long duration, boolean freezed) {
this.duration = duration;
this.freezed = freezed;
}
// ***********************************************************************
/**
* Returns this animation's duration.
*
* @return this animation's duration
*/
@Override
public final long duration() {
return duration;
}
/**
* Answers whether the animation effect should be freezed after
* we exceeded the animation's duration. If this is not the case,
* the animation effect of time 0 will be set.
*
* @return true indicates that the effect will be retained if the
* animation duration exceeded; false indicates that the effect
* will be reset
*/
public final boolean isFreezed() {
return freezed;
}
/**
* Applies the animation effect for the given time to the animation target.
*
* @param time the time used to determine the animation effect
*/
protected abstract void applyEffect(long time);
/**
* Performs the animation at the given time: applies the animation
* effect to the animation target, fires appropriate events,
* and resets the effect if we exceeded the animations duration.
*
* @param time the time used to determine the animation effect
*/
@Override
public void animate(long time) {
if (time >= duration) {
if (active) {
applyEffect(isFreezed() ? duration - 1 : 0);
fireAnimationStopped(time);
active = false;
}
return;
}
if (!active) {
active = true;
fireAnimationStarted(time);
}
applyEffect(time);
}
/**
* Adds an {@code AnimationListener} to this animation.
*
* @param listener the {@code AnimationListener} to add
*/
@Override
public final void addAnimationListener(AnimationListener listener) {
listenerList.add(listener);
}
/**
* Removes an {@code AnimationListener} to this animation.
*
* @param listener the {@code AnimationListener} to remove
*/
@Override
public final void removeAnimationListener(AnimationListener listener) {
listenerList.remove(listener);
}
/**
* Fires an event that indicates that the animation has been started
* at the specified time. The event is created lazily.
*
* @param time the time that will be reported in the event
*/
protected final void fireAnimationStarted(long time) {
AnimationEvent e = null;
for (AnimationListener listener : listenerList) {
if (e == null) {
e = new AnimationEvent(this, AnimationEvent.Type.STARTED, time);
}
listener.animationStarted(e);
}
}
/**
* Fires an event that indicates that the animation has been stopped
* at the specified time. The event is created lazily.
*
* @param time the time that will be reported in the event
*/
protected final void fireAnimationStopped(long time) {
AnimationEvent e = null;
for (AnimationListener listener : listenerList) {
if (e == null) {
e = new AnimationEvent(this, AnimationEvent.Type.STOPPED, time);
}
listener.animationStopped(e);
}
}
/**
* Returns a string representation for this animation.
*
* @return a string representation for this animation
*/
@Override
public String toString() {
return "["
+ getClass().getName()
+ "; duration="
+ duration
+ "; active="
+ active
+ ']';
}
}