问题
I need an example how to add a keyboard handler that detect when Ctrl+C , Ctrl+X , Ctrl+C pressed on a JTree.
I were do this before with menu shortcut keys but with no success.
回答1:
You can add KeyListeners to any component (f)
f.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
if ((e.getKeyCode() == KeyEvent.VK_C) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
System.out.println("woot!");
}
}
@Override
public void keyReleased(KeyEvent e) {
}
});
回答2:
Use KeyListener for example :
jTree1.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
if (evt.isControlDown() && evt.getKeyCode() == KeyEvent.VK_C) {
JOptionPane.showMessageDialog(this, "ctrl + c");
} else if (evt.isControlDown() && evt.getKeyCode() == KeyEvent.VK_X) {
JOptionPane.showMessageDialog(this, "ctrl + x");
} else if (evt.isControlDown() && evt.getKeyCode() == KeyEvent.VK_V) {
JOptionPane.showMessageDialog(this, "ctrl + v");
}
}
});
Hope that helps.
回答3:
Use Key Bindings.
回答4:
initComponents();
KeyboardFocusManager ky=KeyboardFocusManager.getCurrentKeyboardFocusManager();
ky.addKeyEventDispatcher(new KeyEventDispatcher() {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
if (e.getID()==KeyEvent.KEY_RELEASED && (e.getKeyCode() == KeyEvent.VK_C) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
System.out.println("Dhanushka Tharindu");
}
return true;
}
});
回答5:
But menu shortcut accelerators are the way to do this normally: myMenuItem.setAccelerator(KeyStroke.getKeyStroke("control C"));
来源：https://stackoverflow.com/questions/5970765/java-detect-ctrlx-key-combination-on-a-jtree