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java - 从多个 JLabel 获取鼠标点击输入的较小程序

转载 作者:行者123 更新时间:2023-12-02 04:04:51 25 4
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我在一个框架中有一堆标签,基本上用作显示文本的多行输出。在程序的某些点,用户需要从给定的选项中选择一个选项。他们执行此操作的方法是单击相应的 JLabel。

我尝试使用 JLabel 数组,但功能不起作用。然后,我为每个 JLabel 制作了一个单独的 ActionEvent,这可以工作,但是是否有一个优雅或有效的代码?

最佳答案

不客气。

您描述了您的问题,我想我可以理解。

您可以找出 ActionListener 的相似之处,并将这些相似之处放入 super-Class

对我来说,另一种可能性似乎是“一体化”ActionListener。它的 actionPerformed -方法有一个 ActionEvent 类型的参数。此 ActionEvent 提供了一个 getSource() 方法,您可以检索发生 ActionEventJComponent。因此,如果您为 JLabel 指定名称,则可以在 actionPerformed-Method

中检查名称

编辑

像这样:

public void actionPerformed(final ActionEvent actionEvent) {
final String name = ((JComponent) actionEvent.getSource()).getName();
switch (name) {
case "label1":
handleLabel1();
break;
case "label2":
handleLabel2();
break;
case "label3":
handleLabel3();
break;
default:
break;
}
}

编辑 1

import java.awt.AWTEvent;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

public class Application extends JFrame {
private abstract class MyComponentListener implements MouseListener, ActionListener {
protected void actionOnButton(final AWTEvent e) {
final JButton button = (JButton) e.getSource();
switch (button.getName()) {
case "button1":
System.out.println("Hello World");
break;
default:
System.out.println("mouse button one clicked on " + button.getName());
break;
}
// more general
this.actionOnComponent(e);
}

protected void actionOnComponent(final AWTEvent e) {
final JComponent component = (JComponent) e.getSource();
final int index = Integer.valueOf(component.getName().replaceAll("[^0-9]", "")).intValue();
switch (index) {
case 1:
System.out.println("Hello World");
break;
default:
System.out.println("mouse button one clicked on " + component.getName());
break;
}
}

protected void actionOnLabel(final AWTEvent e) {
final JLabel label = (JLabel) e.getSource();
switch (label.getName()) {
case "label1":
System.out.println("Hello World");
break;
default:
System.out.println("mouse button one clicked on " + label.getName());
break;
}
// more general
this.actionOnComponent(e);
}
}

private class MyListener extends MyComponentListener {
/**
* {@link ActionListener#actionPerformed(ActionEvent)}
*/
@Override
public void actionPerformed(final ActionEvent e) {
System.out.println("next line(s) generated by ActionListener");
this.actionOnButton(e);
}

@Override
public void mouseClicked(final MouseEvent e) {
// whole process of mouse button down and up
if ((e.getButton() == 1)) {
System.out.println("next line(s) generated by MouseListener");
if ((e.getSource() instanceof JLabel)) {
this.actionOnLabel(e);
} else if (e.getSource() instanceof JButton) {
this.actionOnButton(e);
}
}
}

@Override
public void mouseEntered(final MouseEvent e) {
// on mouse over
}

@Override
public void mouseExited(final MouseEvent e) {
// on mouse out
}

@Override
public void mousePressed(final MouseEvent e) {
// mouse button down
}

@Override
public void mouseReleased(final MouseEvent e) {
// mouse button up after down
}
}

private static final long serialVersionUID = 1L;

private Application() {
super();
}

public void start() {
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.getContentPane().setLayout(new BoxLayout(this.getContentPane(), BoxLayout.PAGE_AXIS));
this.addLabel("Hello World - Label", "label1");
this.addLabel("Label 2", "label2");
this.addLabel("Label 3", "label3");
this.addButton("Hello Word - Button", "button1");
this.addButton("Button 2", "button2");
final Dimension dimension = new Dimension(500, 150);
this.setSize(dimension);
this.setPreferredSize(dimension);
this.setVisible(true);
}

private void addButton(final String text, final String name) {
final JButton button = new JButton(text);
button.setName(name);
button.addMouseListener(new MyListener());
button.addActionListener(new MyListener());
this.getContentPane().add(button);
}

private void addLabel(final String text, final String name) {
final JLabel label = new JLabel(text);
label.setName(name);
label.addMouseListener(new MyListener());
this.getContentPane().add(label);
}

public static void main(final String[] args) {
final Application app = new Application();
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
app.start();
}
});
}
}

关于java - 从多个 JLabel 获取鼠标点击输入的较小程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56717866/

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