import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class displayFullScreen extends JFrame {
private JLabel alarmMessage = new JLabel("Alarm !");
private JPanel panel = new JPanel();
public displayFullScreen() {
setUndecorated(true);
panel.setLayout(new FlowLayout(FlowLayout.CENTER));
alarmMessage.setText("Alarm !");
alarmMessage.setFont(new Font("Cambria",Font.BOLD,100));
alarmMessage.setForeground(Color.CYAN);
panel.add(alarmMessage);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(0,0,screenSize.width,screenSize.height);
panel.setBackground(Color.black);
add(panel);
addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent ke) { // handler
if(ke.getKeyCode() == ke.VK_ESCAPE) {
System.out.println("escaped ?");
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); // trying to close
} else {
System.out.println("not escaped");
}
}
});
}
public static void main(String args[]) {
new displayFullScreen().setVisible(true);
}
}
我已经为按键设置了一个监听器。每当我按下ESC
key 为什么框架不关闭?
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
public abstract class EscapableFrame extends JFrame
{
public EscapableFrame()
{
// on ESC key close frame
getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "Cancel"); //$NON-NLS-1$
getRootPane().getActionMap().put("Cancel", new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
//framename.setVisible(false);
}
});
}
}
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