www.pudn.com > Bluegammon蓝牙的应用编程.rar > Animation.java

// Copyright (c) 2005 Sony Ericsson Mobile Communications AB 
// 
// This software is provided "AS IS," without a warranty of any kind.  
// ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,  
// INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A  
// PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED.  
// 
// THIS SOFTWARE IS COMPLEMENTARY OF JAYWAY AB (www.jayway.se) 
 
package bluegammon.gui.animation; 
 
import javax.microedition.lcdui.Graphics; 
 
/** 
 * This abstract class represents an animation and is 
 * handled by the AnimationEngine 
 * @author Peter Andersson 
 */ 
public abstract class Animation 
{ 
  	/** Time of last invokation of next on this animation. */ 
	protected long m_lastInvoke = System.currentTimeMillis(); 
	 
	/** 
	 * Override this to invoke functionality at the 
	 * start of this animation 
	 */ 
	public void onStart() {} 
	/** 
	 * Draws the animation using the specified graphics context. 
	 * @param g		The graphics context. 
	 */ 
	public abstract void paint(Graphics g); 
	/** 
	 * Called each time the animation should be updated. 
	 */ 
	public abstract void next(); 
	/** 
	 * Probes to check if the animation can be removed 
	 * @return	true if finished, false if still active 
	 */ 
	public abstract boolean isFinished(); 
	/** 
	 * Returns interval time in milliseconds when the animation should be updated, 
	 * i.e. the next method is invoked. 
	 * @return	update interval in milliseconds. 
	 */ 
	public abstract long getInterval(); 
	/** 
	 * Called from animation engine 
	 * @param t	Current time 
	 */ 
	public void callNext(long t) 
	{ 
		m_lastInvoke = t; 
		next(); 
	} 
	/** 
	 * Returns last update in milliseconds 
	 * @return The time of last update 
	 */ 
	public long getLastInvoke() 
	{ 
		return m_lastInvoke; 
	} 
	/** 
	 * Override this to invoke functionality at the 
	 * end of this animation 
	 */ 
	public void onExit() {} 
}