我有一个 3x3 的 jbutton 网格,标记为 1-9 代表数字键盘。我添加了一个 actionlistener 和 keylistener,它们都调用相同的函数,所以如果他们单击 btn1 或在数字键盘上按 1,就会发生同样的事情。
问题是当我在小键盘上按下 1 时,我想看到 btn1 按下它,如果这有意义的话。
搜索没有找到任何东西,是否有名称?
最佳答案
使用:
- 键绑定(bind) API 而不是
KeyListener
。键绑定(bind)唯一需要做的就是在关联的按钮上调用doClick
... - 使用
doClick
以编程方式“单击”按钮
例如……
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
/**
*
* @author shane
*/
public class Test {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridLayout(3, 3));
add(createButton("1", KeyEvent.VK_NUMPAD1));
add(createButton("2", KeyEvent.VK_NUMPAD2));
add(createButton("3", KeyEvent.VK_NUMPAD3));
add(createButton("4", KeyEvent.VK_NUMPAD4));
add(createButton("5", KeyEvent.VK_NUMPAD5));
add(createButton("6", KeyEvent.VK_NUMPAD6));
add(createButton("7", KeyEvent.VK_NUMPAD7));
add(createButton("8", KeyEvent.VK_NUMPAD8));
add(createButton("9", KeyEvent.VK_NUMPAD9));
}
protected JButton createButton(String name, int virtualKey) {
JButton btn = new JButton(name);
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand() + " was clicked");
}
});
btn.setMargin(new Insets(8, 8, 8, 8));
InputMap im = btn.getInputMap(WHEN_IN_FOCUSED_WINDOW);
ActionMap am = btn.getActionMap();
im.put(KeyStroke.getKeyStroke(virtualKey, 0), "clickMe");
am.put("clickMe", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
JButton btn = (JButton) e.getSource();
btn.doClick();
}
});
return btn;
}
}
}
关于Java Jbutton KeyListener,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27283908/