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Need keys to perform action, and not edit text in a JTextField

Posted on 2001-07-12
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Last Modified: 2012-06-27
I have a JTextField with several components. When the JTextField has focus I would like to use the <->, <+>, <Ins>, <Del>, keys as hot keys on buttons. I have the funcionality correct for the hotkeys, however when I type the <->, <+>, <Ins>, <Del> it is adds or deletes the JTextField text first. I would like to disable the <->, <+>, <Ins>, <Del> keys from changing the text in the JTextField and only use them for the keyListner to perform the methods of the buttons.

I feel like there should be an included method to do this.
I could change the JTextField to different type text object if I can find something that works better.
I would appreciate any help.
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Question by:JDay
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4 Comments
 
LVL 6

Expert Comment

by:kotan
ID: 6279250
Add KeyListener to your JTextField. Then from the KeyEvent parameter, you can get the key pressed through getKeyChar() or getKeyCode() to compare it.

YourJTextField.addKeyListener(new java.awt.event.KeyAdapter()
{
     public void keyPressed(java.awt.event.KeyEvent evt)
     {
          // See Blow
             if (evt.getKeyChar() == '-')
               // do your thing.
          else if (evt.getKeyChar() == '+')
               // do your thing.
          else if (evt.getKeyCode() == KeyEvent.VK_INSERT)
               // do your thing.
          else if (evt.getKeyCode() == KeyEvent.VK_DELETE)
               // do your thing.
        }
});


0
 

Author Comment

by:JDay
ID: 6280713
I have already tried this solution.

The textfield should not be edited when the keys are pressed. For example, the minus should not be added to the textfield before calling the associated method. The textfield is still being edited.

JDay
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LVL 6

Accepted Solution

by:
kotan earned 75 total points
ID: 6284423
Now you change the event to keyTyped and add a line evt.consume() to prevend the certain key to be output to edit box.

YourJTextField.addKeyListener(new java.awt.event.KeyAdapter() {
     public void keyTyped(java.awt.event.KeyEvent evt) {
        // See Blow
        if (evt.getKeyChar() == '-') {
        evt.consume();
           // do your thing.
        }
        else if (evt.getKeyChar() == '+') {
            evt.consume();
           // do your thing.
        }
});
0
 

Author Comment

by:JDay
ID: 6285969
Thank you the evt.consume() did the trick!
Thanks,
Jamie
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