Um ehrlich zu sein, KeyListener
hat viele Einschränkungen und ist umständlich zu verwenden (IMHO), stattdessen würde ich einfach die ausnutzen Tastenbelegungen API, die Ihnen im Allgemeinen eine größere Flexibilität und potenzielle Versicherung bietet.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class KeyListenerTest {
public static void main(String[] args) {
new KeyListenerTest();
}
public KeyListenerTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel lbl;
private boolean fullScreen = false;
public TestPane() {
lbl = new JLabel("Normal");
setLayout(new GridBagLayout());
add(lbl);
InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
ActionMap am = getActionMap();
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_F, InputEvent.CTRL_DOWN_MASK), "FullScreen");
am.put("FullScreen", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
if (fullScreen) {
lbl.setText("Normal");
} else {
lbl.setText("Full Screen");
}
fullScreen = !fullScreen;
}
});
}
}
}
Und nur damit Sie nicht glauben, dass ich völlig voreingenommen bin. Hier ist ein Beispiel verwendet KeyListener
...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class KeyListenerTest {
public static void main(String[] args) {
new KeyListenerTest();
}
public KeyListenerTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JLabel lbl;
private boolean fullScreen = false;
public TestPane() {
lbl = new JLabel("Normal");
setLayout(new GridBagLayout());
add(lbl);
setFocusable(true);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
requestFocusInWindow();
}
});
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_F && e.isControlDown()) {
if (fullScreen) {
lbl.setText("Normal");
} else {
lbl.setText("Full Screen");
}
fullScreen = !fullScreen;
}
}
});
}
}
}