确定在MouseListener中单击的JPanel组件。事件处理
确定在MouseListener中单击的JPanel组件。事件处理
提问于 2011-09-08 04:15:39
我有一个扩展JPanel的类：
public class ButtonPanel extends JPanel {
private label;
public ButtonPanel() {
label=new JLabel("waiting for click");
add(label);
}
public void setButtonText() {
label.setText("just clicked");
}
}我有几个被添加到JFrame中的类的实例。我想创建一个MouseAdapter类的实例，然后将它们作为鼠标侦听器添加到我的JFrame上的所有ButtonPanel组件中。我的意思是：
ButtonPanel butt1 = new ButtonPanel();
ButtonPanel butt2 = new ButtonPanel();
ButtonPanel butt3 = new ButtonPanel();
//... here goes code which add ButtonPanels to JFrame
MouseAdapterMod mam = new MouseAdapterMod();
butt1.addMouseListener(mam);
butt2.addMouseListener(mam);
butt3.addMouseListener(mam);我希望将MouseAdapterMod类与其他类分开，并定位在它自己的包中。它应该看起来像这样：
public class MouseAdapterMod extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
//here goes the code of calling setButtonText method of ButtonPanel component on which the event had occurred
}
}所以问题是，我不知道如何实现mouseClicked方法来确定哪个ButtonPanel生成事件，并调用与该组件setButtonText()方法相对应的。有人知道怎么做吗？
我知道我可以通过在ButtonPanel类中包含事件处理功能来实现这一点，但这种方式对我来说并不合适，因为我希望保持如上所述的类结构，并且只有一个MouseAdapterMod类实例来处理所有的ButtonPanels。
回答 1
Stack Overflow用户
回答已采纳
发布于 2011-09-08 04:20:47
MouseEvent#getSource方法将返回被单击的对象：
public class MouseAdapterMod extends MouseAdapter {
// usually better off with mousePressed rather than clicked
public void mousePressed(MouseEvent e) {
ButtonPanel btnPanel = (ButtonPanel)e.getSource();
btnPanel.setButtonText();
}
}正如评论指出的那样，你最好听mousePressed或mouseReleased，而不是mouseClicked，因为要让mouseClicked正常工作，按下和释放必须是从同一个点上进行的，如果鼠标移动了一点点，点击就不会被记录下来。
我的测试程序：
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.*;
import javax.swing.*;
public class MainForButtonPanel extends JPanel {
public MainForButtonPanel() {
setLayout(new GridLayout(4, 4));
MouseAdapter myMA = new MouseAdapterMod();
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
ButtonPanel btnPanel = new ButtonPanel();
btnPanel.addMouseListener(myMA);
add(btnPanel);
}
}
}
private static void createAndShowUI() {
JFrame frame = new JFrame("MainForButtonPanel");
frame.getContentPane().add(new MainForButtonPanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
class ButtonPanel extends JPanel {
private static final int TIMER_DELAY = 2000;
private static final String JUST_CLICKED = "just clicked";
private static final String WAITING_FOR_CLICK = "waiting for click";
private static final Color CLICKED_COLOR = Color.pink;
private JLabel label;
public ButtonPanel() {
label = new JLabel(WAITING_FOR_CLICK);
add(label);
}
public void setButtonText() {
label.setText(JUST_CLICKED);
setBackground(CLICKED_COLOR);
new Timer(TIMER_DELAY, new ActionListener() {
public void actionPerformed(ActionEvent ae) {
label.setText(WAITING_FOR_CLICK);
setBackground(null);
((Timer)ae.getSource()).stop();
}
}).start();
}
}
class MouseAdapterMod extends MouseAdapter {
// usually better off with mousePressed rather than clicked
public void mousePressed(MouseEvent e) {
ButtonPanel btnPanel = (ButtonPanel)e.getSource();
btnPanel.setButtonText();
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/7340001
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