animatedcanvaselement.java

来自「J2ME上的一个播放器,可以更换皮肤.开源软件.」· Java 代码 · 共 74 行

package inline.ui.ce;

import inline.ui.*;
import java.util.*;
import javax.microedition.lcdui.*;


    public class AnimatedCanvasElement extends CanvasElement 
    {
	final private static int TAG_ANIM_CLOCK = 0xE8219901;

	private int interval;
	private boolean animated;
	private Timer ticker;
	
        public AnimatedCanvasElement(HostCanvas prnt, int x, int y, int w, int h)
	{
	    super(prnt, x, y, w,h);
	}

        public AnimatedCanvasElement(HostCanvas prnt)
        {
            this(prnt, 0,0,0,0);
        }
	
	public void showNotify()
	{
	    super.showNotify();
	    
	    if (animated)
	    {
		ticker = getParent().newFixedRateTimer(ticker, TAG_ANIM_CLOCK,
					      interval, interval, this);
		onAnimate();
	    }
	}
	
	public void hideNotify()
	{
	    super.hideNotify();
	    ticker = getParent().killTimer(ticker);
	}
	
	public void onTimer(int tag, long delay)
	{
	    if (tag == TAG_ANIM_CLOCK)
	    {
		onAnimate();
	    }
	    else
	    {
		super.onTimer(tag, delay);
	    }
	}
	
	protected void onAnimate() // override this
	{
	}
	
	public void setInterval(int iinterval)
	{
	    interval = iinterval;
	}
	
	public void setAnimated(boolean aanimated)
	{
	    animated = aanimated;
	}
    }