调度事件后不调用 processEvent

Question

如果我向 JButton 发送一个（操作）事件，则不会调用按钮的 processEvent 方法。

在下面的示例中，我认为将执行以下步骤

b1 将事件分派给 b2（dispatchEvent 被调用）
b2 处理事件 (processEvent 被调用)
b2 执行其动作侦听器

但是第2步和第3步不会执行。谁能解释为什么？

import java.awt.AWTEvent;
import java.awt.event.*;
import javax.swing.*;

public class JavaApplication {

  public static void main(String[] args) {
    final JFrame frame = new JFrame();
    final JPanel panel = new JPanel();
    final JButton b2 = new JButton("b2") {
      @Override
      public void processEvent(AWTEvent evt) {
        System.out.println("action event will be processed" + evt.toString());
        super.processEvent(evt);
      }
    };

    b2.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        System.out.println("b2 clicked");
      }
    });

    final JButton b1 = new JButton("b1");

    b1.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        System.out.println("b1 clicked");
        final ActionEvent e2 = new ActionEvent(e.getSource(), e.getID(), "Redispatch-Event");
        b2.dispatchEvent(e2);

      }
    });

    panel.add(b1);
    panel.add(b2);
    frame.add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}

Answer 1

您可能希望发送按钮 MouseEvent:

MouseEvent e2 = new MouseEvent(
    (Component)e.getSource(), MouseEvent.MOUSE_CLICKED, e.getWhen(), 0, 1,1, 1, false );

调度事件后不调用 processEvent

processEvent is not called after dispatching an event

java

events

swing

jbutton