为什么在Linux，JButton，JLabel鼠标点击是丢失或忽略？这不是程序应该做的

Question

我有这个SSCCE，它被按下了它什么也不做，而且如果我在JLabel中点击它也失败了，它不可靠，很多点击被错过了。但其他发行版--我检查了相同的代码--就能工作了。只在戴尔Inspiron触摸屏PC，它不工作。

• 我点击了JButton 100次，但它显示了2次
• 我点击了JLabel 100次，但它显示了0次
• 我也在JFrame中点击了100次，但是它显示了0次按下

运行：

$ uname -a
Linux sun-Inspiron-One-2320 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.1 LTS
Release:    12.04
Codename:   precise

$ java -version
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.5) (6b24-1.11.5-0ubuntu1~12.04.1)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

$ export DISPLAY=:0.0 && java -cp YumYumYum.jar UnitTest.MouseMethods
The JButton was clicked...
The JButton was clicked...

复制和粘贴：

package UnitTest;

import java.awt.FlowLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class MouseMethods implements MouseListener {

  private JLabel label = new JLabel("This is a JLabel");
  private JButton button = new JButton("This is a JButton");

  public MouseMethods() {
    JFrame frame = new JFrame("MouseMethods");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new FlowLayout());

    label.addMouseListener(this);
    button.addMouseListener(this);

    frame.add(label);
    frame.add(button);
    frame.setVisible(true);
    frame.pack();
  }

  public void mouseClicked(MouseEvent e) {
    if (e.getSource().equals(button)) {
      System.out.println("The JButton was clicked...");
    } else if (e.getSource().equals(label)) {
      System.out.println("The JLabel was clicked...");
    } else {
      System.out.println("Something else was clicked...");
    }
  }

  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[]) {
    new MouseMethods();
  }
}

后续行动：

$ uname -a
Linux sun-Inspiron-One-2320 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$ apt-cache search linux-image
alsa-base - ALSA driver configuration files
linux-image - Generic Linux kernel image.
linux-image-3.2.0-23-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-23-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-23-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-virtual - Linux kernel extra modules for virtual machines
linux-image-generic - Generic Linux kernel image
linux-image-server - Linux kernel image on Server Equipment.
linux-image-virtual - Linux kernel image for virtual machines
linux-virtual - Complete Linux kernel for virtual machines
linux-image-3.2.0-23-generic-pae - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-generic-pae - Generic Linux kernel image
linux-image-3.2.0-23-lowlatency - Linux kernel image for version 3.2.0 on x86/x86_64
linux-image-lowlatency - lowlatency Linux kernel image
linux-image-3.2.0-23-lowlatency-pae - Linux kernel image for version 3.2.0 on x86
linux-image-lowlatency-pae - lowlatency Linux kernel image
linux-image-3.2.0-24-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-24-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-25-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-25-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-26-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-26-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-27-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-27-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-29-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-29-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-30-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-30-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-31-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-31-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-32-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-32-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.2.0-33-generic - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-33-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-3.5.0-18-generic - Linux kernel image for version 3.5.0 on 64 bit x86 SMP
linux-image-current-generic - Depends on the most recently released generic kernel image and headers.
linux-image-extra-3.2.0-24-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-25-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-26-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-27-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-29-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-30-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-31-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-32-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-extra-3.2.0-33-virtual - Linux kernel image for version 3.2.0 on 64 bit x86 Virtual Guests
linux-image-generic-lts-quantal - Generic Linux kernel image
linux-image-hwe-generic - Depends on the generic hardware enablement kernel image and headers.
linux-image-3.2.0-24-generic-pae - Linux kernel image for version 3.2.0 on 64 bit x86 SMP
linux-image-3.2.0-25-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-26-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-27-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-29-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-30-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-31-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-32-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-33-generic-pae - Linux kernel image for version 3.2.0 on 32 bit x86 SMP
linux-image-3.2.0-33-lowlatency - Linux kernel image for version 3.2.0 on x86/x86_64
linux-image-3.2.0-33-lowlatency-pae - Linux kernel image for version 3.2.0 on x86


$ apt-get install linux-image-3.2.0-33-generic
$ init 6
$ uname -a
Linux sun-Inspiron-One-2320 3.2.0-33-generic #52-Ubuntu SMP Thu Oct 18 16:29:15 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Answer 1

我建议您不要在类本身中实现侦听器。我认为每个组件都应该有自己的侦听器(按源分支可能不是最好的主意).

此外，如果不需要实现所有方法，则最好扩展MouseAdapter