Java GUI之MouseListener、MouseMotionListener

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用于接收组件上“感兴趣”的鼠标事件（按下、释放、单击、进入或离开）的侦听器接口。

public interface MouseListenerextends EventListener

（要跟踪鼠标移动和鼠标拖动，请使用 MouseMotionListener。）旨在处理鼠标事件的类要么实现此接口（及其包含的所有方法），要么扩展抽象类 MouseAdapter（仅重写所需的方法）。然后使用组件的 addMouseListener 方法将从该类所创建的侦听器对象向该组件注册。当按下、释放或单击（按下并释放）鼠标时会生成鼠标事件。鼠标光标进入或离开组件时也会生成鼠标事件。发生鼠标事件时，将调用该侦听器对象中的相应方法，并将 MouseEvent 传递给该方法

public class Mouse extends JFrame {   /**    *     */   private static final long serialVersionUID = 1L;   private JLabel label;   public Mouse() {      super("mouse");      Container container = getContentPane();      container.setLayout(new BorderLayout());      label = new JLabel();      container.add(label, BorderLayout.SOUTH);      setSize(300, 300);      setVisible(true);      Handler1 handler1 = new Handler1();      Handler2 handler2 = new Handler2();      container.addMouseListener(handler1);      container.addMouseMotionListener(handler2);   }   public class Handler1 implements MouseListener {      public void mouseClicked(MouseEvent e) {         label.setText("鼠标点击的坐标[" + e.getX() + "," + e.getY() + "]");      }      public void mousePressed(MouseEvent e) {         label.setText("鼠标经过的坐标[" + e.getX() + "," + e.getY() + "]");      }      public void mouseReleased(MouseEvent e) {         label.setText("鼠标释放的坐标[" + e.getX() + "," + e.getY() + "]");      }      public void mouseEntered(MouseEvent e) {         // JOptionPane.showMessageDialog(null, "鼠标进入窗口");      }      public void mouseExited(MouseEvent e) {         label.setText("鼠标在窗口之外");      }   }   public class Handler2 implements MouseMotionListener {      public void mouseDragged(MouseEvent e) {         label.setText("鼠标拖拽的坐标[" + e.getX() + "," + e.getY() + "]");      }      public void mouseMoved(MouseEvent e) {         label.setText("鼠标移动的坐标[" + e.getX() + "," + e.getY() + "]");      }   }   public static void main(String[] args) {      Mouse g = new Mouse();      g.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   }}

源码地址:https://github.com/followwwind/javase

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