我想要一个在屏幕键上移动的普通JFrame。 结果并非那么容易。
出于某种原因,我得到了一个粗略的代码e.getKeyChar()
甚至可能吗?我认为我们必须以某种方式重写技术,因为我开始了,但是有些不对劲。
提示,调整 -
public class Main implements Runnable {
private int xLocation = 200;
private int yLocation = 200;
private JFrame frame;
public static void main(String[] args) {
EventQueue.invokeLater(new Main());
}
@Override
public void run() {
KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
manager.addKeyEventDispatcher(new MyDispatcher());
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
JPanel panel = new JPanel();
panel.add(new JLabel("Label"));
panel.add(new JButton(new AbstractAction("Close") {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}));
frame.add(panel);
frame.pack();
frame.setLocation(xLocation, yLocation);
frame.setVisible(true);
}
private class MyDispatcher implements KeyEventDispatcher, KeyListener {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
char key = e.getKeyChar();
if(key==KeyEvent.VK_LEFT){
}
if (e.getID() == KeyEvent.KEY_PRESSED) {
//System.out.println("tester");
} else if (e.getID() == KeyEvent.KEY_RELEASED) {
//System.out.println("2test2");
} else if (e.getID() == KeyEvent.KEY_TYPED) {
//System.out.println("3test3");
}
return false;
}
@Override
public void keyPressed(KeyEvent e) {
System.out.println("e.getKeyChar() " + e.getKeyChar());
char key = e.getKeyChar();
if (key == KeyEvent.VK_LEFT) {
xLocation += 5;
}
frame.setLocation(xLocation, yLocation);
frame.repaint();
}
@Override
public void keyReleased(KeyEvent e) {
}
@Override
public void keyTyped(KeyEvent e) {
}
}
}
答案 0 :(得分:2)
final JFrame jFrame = new JFrame();
jFrame.getRootPane().getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, KeyEvent.VK_UNDEFINED), "moveRight");
jFrame.getRootPane().getActionMap().put("moveRight", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
jFrame.setLocation(jFrame.getX() + 5, jFrame.getY());
}
});
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setLocationRelativeTo(null);
jFrame.setVisible(true);
如果您的JFrame
内有祖先,则应采用InputMap/ActionMap
方法。见官方guide。