java mouseclicked_java swing 单击事件mouseClicked与一般事件actionPerformed区别 | 学步园...

最新推荐文章于 2023-12-25 23:32:02 发布

原创最新推荐文章于 2023-12-25 23:32:02 发布 · 437 阅读

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#java mouseclicked

本文通过示例代码解释了Java Swing中鼠标单击事件mouseClicked与一般事件actionPerformed的区别。当按钮设置为不可用时，mouseClicked事件仍会触发，而actionPerformed事件则不再响应。

//鼠标单击事件无论什么时候都监听，即使按钮已经不能用了，事件依然走；

//一般事件，在设置按钮不可用后就不在走了

例子很能说明问题：

package eeeee;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import org.dyno.visual.swing.layouts.Constraints;

import org.dyno.visual.swing.layouts.GroupLayout;

import org.dyno.visual.swing.layouts.Leading;

//VS4E -- DO NOT REMOVE THIS LINE!

public class bbbb extends JFrame {

private static final long serialVersionUID = 1L;

private JButton jButton0;

private JButton jButton1;

private static final String PREFERRED_LOOK_AND_FEEL = "javax.swing.plaf.metal.MetalLookAndFeel";

public bbbb() {

initComponents();

}

private void initComponents() {

setLayout(new GroupLayout());

add(getJButton0(), new Constraints(new Leading(52, 10, 10), new Leading(39, 10, 10)));

add(getJButton1(), new Constraints(new Leading(195, 10, 10), new Leading(39, 12, 12)));

setSize(320, 240);

}

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton();

jButton1.setText("jButton1");

jButton1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent event) {

jButton1ActionActionPerformed(event);

}

});

}

return jButton1;

}

private JButton getJButton0() {

if (jButton0 == null) {

jButton0 = new JButton();

jButton0.setText("jButton0");

jButton0.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent event) {

jButton0MouseMouseClicked(event);

}

});

}

return jButton0;

}

private static void installLnF() {

try {

String lnfClassname = PREFERRED_LOOK_AND_FEEL;

if (lnfClassname == null)

lnfClassname = UIManager.getCrossPlatformLookAndFeelClassName();

UIManager.setLookAndFeel(lnfClassname);

} catch (Exception e) {

System.err.println("Cannot install " + PREFERRED_LOOK_AND_FEEL

+ " on this platform:" + e.getMessage());

}

/**

* Main entry of the class.

* Note: This class is only created so that you can easily preview the result at runtime.

* It is not expected to be managed by the designer.

* You can modify it as you like.

public static void main(String[] args) {

installLnF();

SwingUtilities.invokeLater(new Runnable() {

@Override

public void run() {

bbbb frame = new bbbb();

frame.setDefaultCloseOperation(bbbb.EXIT_ON_CLOSE);

frame.setTitle("bbbb");

frame.getContentPane().setPreferredSize(frame.getSize());

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

});

}

//00

private void jButton0MouseMouseClicked(MouseEvent event) {

jButton0.setEnabled(false);

System.out.println("click 00");

}

//11

private void jButton1ActionActionPerformed(ActionEvent event) {

jButton1.setEnabled(false);

System.out.println("click 1111");

}

点击button0后，它设置成不可用，但它依然响应事件(里面的打印输出了)

而点击button1后，设置它不可用，再点击它，就没反应了，说明真的不可用了。

从这里我们直观的看出两种事件的区别，更深的道理我就不说了，嘿嘿