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.

Code java:

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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");
		}
	};
}

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

Quote:

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Originally Posted by copeg

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

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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:

Code java:

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

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