Thread: Key Bindings

i can't seem to get this example to work. the goal is for "REDO" to be printed when you type ctrl+y, and "UNDO" when you type ctrl+z. there are no errors, but nothing is outputted when you type ctrl+y or ctrl+z.

import java.awt.event.*;
import javax.swing.*;
 
public class Test extends JPanel{
 
	public Test(){
		setFocusable(true);
		ActionMap a = getActionMap();
		InputMap  i = getInputMap();
		KeyStroke undoKeyStroke = KeyStroke.getKeyStroke("control typed z");
		KeyStroke redoKeyStroke = KeyStroke.getKeyStroke("control typed y");
		i.put(undoKeyStroke, "undo");
		i.put(redoKeyStroke, "redo");
		a.put("undo",undoAction);
		a.put("redo",redoAction);
	}
 
	public static void main(String[] args){
		JFrame frame = new JFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(300,300);
		frame.getContentPane().add(new Test());
		frame.setVisible(true);
	}
 
	Action redoAction = new AbstractAction(){
		public void actionPerformed(ActionEvent e){
			System.out.println("REDO");
		}
	};
	Action undoAction = new AbstractAction(){
		public void actionPerformed(ActionEvent e){
			System.out.println("UNDO");
		}
	};
}

Try removing the typed element when creating the keystroke. See Keystroke

Originally Posted by copeg

Try removing the typed element when creating the keystroke. See Keystroke

that didn't work. i've also tried changing control to ctrl, putting both control and ctrl, changing z to Z and y to Y, putting "VK_" in front of z and y (which returns null).

i've resorted to this, which works:

KeyStroke undoKeyStroke = KeyStroke.getKeyStroke("control pressed Z");
KeyStroke redoKeyStroke = KeyStroke.getKeyStroke("control pressed Y");