superbtn.java

时空图计算和编辑程序

package super_cpt;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class SuperBtn extends Label{

	/**
	 * 超级按钮
	 */
	public final static int DY=2;
	protected boolean pressed=false;
	protected String label;
	private ActionListener myListener;//我的监听器
	private final ActionEvent myEvent;//我的事件
	//绘制
	protected BufferedImage backImage=null;
	protected Graphics2D g2;
	public SuperBtn(String str)
	{
		label=str;
		myEvent=new ActionEvent(this,ActionEvent.ACTION_PERFORMED,label);
		//mouse
		this.addMouseListener(new MouseAdapter(){
			public void mousePressed(MouseEvent e)
			{//
				if(e.getButton()!=MouseEvent.BUTTON1)return;
				if(!isEnabled())return;
				pressed=true;
				repaint();
			}
			public void mouseReleased(MouseEvent e)
			{//
				if(e.getButton()!=MouseEvent.BUTTON1)return;
				if(!isEnabled())return;
				pressed=false;
				repaint();
				if(myListener!=null)
					myListener.actionPerformed(myEvent);
			}
		});
	}
	public void addActionListener(ActionListener l)
	{
		myListener=l;
	}
	public void update(Graphics g)
	{//初始化背景大小
		int w=getWidth(),h=getHeight();
		if(backImage==null || g2==null){
			backImage=this.getGraphicsConfiguration().createCompatibleImage(w,h);
			g2=backImage.createGraphics();
			g2.setFont(new Font(g2.getFont().getFontName(),Font.PLAIN,13));
		}
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
		g2.setColor(Color.WHITE);
		g2.fillRect(0,0,w,h);
		g2.setColor(Color.BLACK);
		g2.drawString(label,2,14);
		paint(g);
	}
	public void paint(Graphics g)
	{
		if(backImage==null)
		{
			repaint();
		}
		if(pressed)
			g.drawImage(backImage,0,DY,this);
		else
			g.drawImage(backImage,0,0,this);
	}
}