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阅前声明: http://blog.csdn.net/heimaoxiaozi/archive/2007/01/19/1487884.aspx
2－1－1：MouseListener的使用： -------------------------------------------------------------------------------------------------------------- MouseListener mouseClicked(MouseEvent e) mouseEntered(MouseEvent e) mouseExited(MouseEvent e) mousePressed(MouseEvent e) mouseReleased(MouseEvent e) -------------------------------------------------------------------------------------------------------------- MouseDemo1.java import java.awt.*; import java.awt.event.*; import javax.swing.*; /*我们继承WindowAdapter抽象类并实现MouseListener interface, *因此我们必须把MouseListener中的5个方法都实现，如果不想实现 *可用匿名内部类的方法编写处理程序。 */ public class MouseDemo1 extends WindowAdapter implements MouseListener{ JFrame f=null; JButton b1=null; JLabel label=null; public MouseDemo1(){ f=new JFrame("MouseDemo1"); Container contentPane=f.getContentPane(); contentPane.setLayout(new GridLayout(2,1)); b1=new JButton("按钮"); label=new JLabel("起始状态，还没有鼠标事件",JLabel.CENTER); b1.addMouseListener(this); contentPane.add(label); contentPane.add(b1); f.pack(); f.show(); f.addWindowListener(this); } public void mousePressed(MouseEvent e){ label.setText("你已经压下鼠标按钮"); } public void mouseReleased(MouseEvent e){ label.setText("你已经放开鼠标按钮"); } public void mouseEntered(MouseEvent e){ label.setText("鼠标光标进入按钮"); } public void mouseExited(MouseEvent e){ label.setText("鼠标光标离开按钮"); } public void mouseClicked(MouseEvent e){ label.setText("你已经按下按钮"); } public void windowClosing(WindowEvent e){ System.exit(0); } public static void main(String[] args){ new MouseDemo1(); } } 2－1－2：MouseMotionListener的使用： 下面是讨论MouseMotionListener的使用时机,它提供的下面的两个方法，可让你随时掌握鼠标的坐标，并处理拖曳鼠标 的操作。 -------------------------------------------------------------------------------------------------------------- MouseMotionListener mouseDragged(MouseEvent e) mouseMoved(MouseEvent e) -------------------------------------------------------------------------------------------------------------- 下面的范例让你知道鼠标在JFrame上的坐标，并拖曳出直线来。 例子：MouseDemo3.java import java.awt.*; import java.awt.event.*; import javax.swing.*; /*为了达到画线的功能，我们分别implements MouseListener与MouseMotionListener. */ public class MouseDemo3 extends JFrame implements MouseListener,MouseMotionListener{ int flag;//flag=1代表Mouse Moved,flag=2代表Mouse Dragged int x=0; int y=0; int startx,starty,endx,endy;//起始坐标与终点坐标 public MouseDemo3(){ Container contentPane=getContentPane(); contentPane.addMouseListener(this); contentPane.addMouseMotionListener(this); setSize(300,300); show(); addWindowListener( new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } } ); } /*由mousePressed(),mouseReleased()取得示拖曳的开始与结束坐标*/ public void mousePressed(MouseEvent e){ startx=e.getX(); starty=e.getY(); } public void mouseReleased(MouseEvent e){ endx=e.getX(); endy=e.getY(); } public void mouseEntered(MouseEvent e){ } public void mouseExited(MouseEvent e){ } public void mouseClicked(MouseEvent e){ } /*mouseMoved(),mouseDragged()取得鼠标移动的每一个坐标，并调用repaint()方法*/ public void mouseMoved(MouseEvent e){ flag=1; x=e.getX(); y=e.getY(); repaint(); } public void mouseDragged(MouseEvent e){ flag=2; x=e.getX(); y=e.getY(); repaint(); } public void update(Graphics g){ g.setColor(this.getBackground()); g.fillRect(0,0,getWidth(),getHeight()); paint(g); } public void paint(Graphics g){ g.setColor(Color.black); if (flag==1){ g.drawString("鼠标坐标：("+x+","+y+")",10,50); g.drawLine(startx,starty,endx,endy); } if (flag==2){ g.drawString("拖曳鼠标价坐标：("+x+","+y+")",10,50); g.drawLine(startx,starty,x,y); } } public static void main(String[] args){ new MouseDemo3(); } }
