有难度的问题（也许）：点击jpanel里的区域，如何判断点击到了什么组件？

Toolkit.getDefaultToolkit().addAWTEventListener()

所有的原生事件都在这儿流过，你只要filter一下就行了，
首先是mouse pressed的事件的
然后其source的ancestor组件为该jpanel的
就说明该事件是符合要求的事件，取出source就是该组件。

但是组件我并没有定义监听器，这样还会有source吗？

没有定义监听器也有，这儿的事件是AWTEvent，是原生事件。

我试了一下，当我监听MOUSE_EVENT_MASK事件时，点击一个组件会多次触发监听器，因为所有的鼠标事件都被监听了－－获得焦点、失去焦点、鼠标移动，但我只想得到一次，即鼠标点击的时候，但我看了awtevent，没有这种事情，另外，jlabel又需要什么事件去监听呢？MOUSE_EVENT_MASK 对此没有反应。

我点击jlabel的时候，source居然是其所在的applet

还是在每个Component上都添加MouseListener比较简单，只要覆盖 addImpl()方法就可以了。import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.*;import javax.swing.*;public class T extends JPanel implements MouseListener {
public T() {
this.addMouseListener(this);
}

@Override
protected void addImpl(Component comp, Object constraints, int index) {
super.addImpl(comp, constraints, index);
comp.addMouseListener(this);
}

public void mouseClicked(MouseEvent e) {
System.out.println("点击了 " + e.getComponent());
} public void mouseEntered(MouseEvent e) {
} public void mouseExited(MouseEvent e) {
} public void mousePressed(MouseEvent e) {
} public void mouseReleased(MouseEvent e) {
}

public static void main(String[] args) {
JPanel p = new T();
for (int i = 0; i < 10; i++) {
p.add(new JLabel("Label " + (i+1)));
}

JFrame f = new JFrame();
f.getContentPane().add(p, BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}

按理说能按照Toolkit.getDefaultToolkit().addAWTEventListener()方式实现。不过具体还是要费一番周折。
楼主还是按照gtlang78的方法吧。不想多费周折了。

呵呵,其实还有一种实现方式啊:使用JFrame中的GlassPane!
大家知道,glasspane是组建最外层的一块"玻璃",不过一般是处于unvisible的.
当你将它设为visible后,就可以用它来拦截所有的鼠标事件了.
在glasspane上加一个MouseListener,在mouseClicked(MouseEvent e) 方法里通过e.getPoint()得到鼠标所在位置,然后通过SwingUtilities.getDeepestComponentAt(..)方法就可以得到当前鼠标点击的组件了.大概思路是这样,不过其实里面还有个难点,就是glasspane把所有的鼠标事件拦截了,你的自己通过某种方式把这些事件重新传到里面去.

public class TestPanel extends javax.swing.JPanel implements java.awt.event.MouseListener{
    /** Creates new form TestPanel */
    public TestPanel() {
        initComponents();
        addMouseListener(this);
        jButton1.addMouseListener(actonForButton);
        jButton2.addMouseListener(actonForButton);
        jButton3.addMouseListener(actonForButton);
        jButton4.addMouseListener(actonForButton);
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();

        setLayout(new java.awt.GridBagLayout());
        java.awt.GridBagConstraints gridBagConstraints1;

        jButton1.setText("jButton1");
        jButton1.setName("button one");
        gridBagConstraints1 = new java.awt.GridBagConstraints();
        gridBagConstraints1.gridx = 0;
        gridBagConstraints1.gridy = 0;
        gridBagConstraints1.insets = new java.awt.Insets(10, 10, 10, 10);
        add(jButton1, gridBagConstraints1);

        jButton2.setText("jButton2");
        jButton2.setName("button two");
        gridBagConstraints1 = new java.awt.GridBagConstraints();
        gridBagConstraints1.gridx = 1;
        gridBagConstraints1.gridy = 0;
        gridBagConstraints1.insets = new java.awt.Insets(10, 10, 10, 10);
        add(jButton2, gridBagConstraints1);

        jButton3.setText("jButton3");
        jButton3.setName("button three");
        gridBagConstraints1 = new java.awt.GridBagConstraints();
        gridBagConstraints1.gridx = 0;
        gridBagConstraints1.gridy = 1;
        gridBagConstraints1.insets = new java.awt.Insets(10, 10, 10, 10);
        add(jButton3, gridBagConstraints1);

        jButton4.setText("jButton4");
        jButton4.setName("button four");
        gridBagConstraints1 = new java.awt.GridBagConstraints();
        gridBagConstraints1.gridx = 1;
        gridBagConstraints1.gridy = 1;
        gridBagConstraints1.insets = new java.awt.Insets(10, 10, 10, 10);
        add(jButton4, gridBagConstraints1);

    }
    public void mouseExited(java.awt.event.MouseEvent mouseEvent) {}
    public void mousePressed(java.awt.event.MouseEvent mouseEvent) {}
    public void mouseReleased(java.awt.event.MouseEvent mouseEvent) {  }
    public void mouseClicked(java.awt.event.MouseEvent mouseEvent) {
        if(mouseEvent.getComponent()==this)System.out.println("panel clicked!");
        else System.out.println("button clicked! button name="+mouseEvent.getComponent().getName());
    }
    public void mouseEntered(java.awt.event.MouseEvent mouseEvent) {    }

    public static void main(String[] args) {
        TestPanel panel=new TestPanel();
        javax.swing.JFrame frame=new javax.swing.JFrame("test");
        frame.setContentPane(panel);
        frame.pack();
        frame.setBounds(200,200,700,400);
        frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    // End of variables declaration
    java.awt.event.MouseAdapter actonForButton=new java.awt.event.MouseAdapter(){
        public void mouseClicked(java.awt.event.MouseEvent mouseEvent) {
            java.awt.Component c=mouseEvent.getComponent();
            System.out.println(c.getName()+" clicked!");
            javax.swing.JPanel p=(javax.swing.JPanel)c.getParent();
            java.awt.event.MouseListener[] ms=p.getMouseListeners();
            for(int i=0;i<ms.length;i++)ms[i].mouseClicked(mouseEvent);//在本例可直接调用 this.mouseClicked(mouseEvent)
        }
    };
}

参照gtlang78的方法，可以实现，可以遍历applet的成员变量，然后添加MouseListener，dejinzhao那个是一种手动逐个添加的办法。这个帖子含金量这么高，我再加80分.

调试易

有难度的问题（也许）：点击jpanel里的区域，如何判断点击到了什么组件？

解决方案 »