How to use KeyEvent

Question

I'm writing small graphics editor and I want catch event when I press Ctrl+A

I use such code (this is test version):

@Override
public void keyPressed(KeyEvent e) {
    System.out.println("Press");
    switch (e.getKeyCode()){
        case KeyEvent.VK_A :
            System.out.println("A");
            break;
    }
}

but I don't know how to catch Ctrl+a

I tryed something like this

    case KeyEvent.VK_CONTROL+KeyEvent.VK_A :
        System.out.println("A+CTRL");
        break;

but this code KeyEvent.VK_CONTROL+KeyEvent.VK_A returns int and maybe another key combination returns the same number

So can someone can help me

See http://stackoverflow.com/questions/5970765/java-detect-ctrlx-key-combination-on-a-jtree — Reimeus, Nov 25 '12 at 15:06
And choose [*Key Bindings*](http://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html). — trashgod, Nov 25 '12 at 15:16
I strongly second @trashgod's recommendation. This is not a place for a KeyListener but rather for key bindings. — Hovercraft Full Of Eels, Nov 25 '12 at 15:32
See also [*How to Write a Key Listener*](http://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html) for details. — trashgod, Nov 25 '12 at 20:44

score 5 · Accepted Answer · answered Nov 25 '12 at 15:08

You can use isControlDown() method:

switch (e.getKeyCode())
{
        case KeyEvent.VK_A :
            if(e.isControlDown())
               System.out.println("A and Ctrl are pressed.");
            else
                System.out.println("Only A is pressed");
            break;
        ...
}

score 3 · Answer 2 · answered Nov 25 '12 at 15:05

Try this.....

f.addKeyListener(new KeyListener() {

        @Override
        public void keyTyped(KeyEvent e) {
        }

        @Override
        public void keyPressed(KeyEvent e) {
            if ((e.getKeyCode() == KeyEvent.VK_A) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
                System.out.println("woot!");
            }
        }

        @Override
        public void keyReleased(KeyEvent e) {
        }
    });

score 3 · Answer 3 · answered Nov 25 '12 at 15:06

3

Try isControlDown method on KeyEvent: http://docs.oracle.com/javase/6/docs/api/java/awt/event/InputEvent.html#isControlDown%28%29

answered Nov 25 '12 at 15:06

Mikita Belahlazau

15,326
2
38
43

How to use KeyEvent

3 Answers3

Linked