CODEWITHSUNDEEP
javaswt
Vlad Ilie
Vlad Ilie

Reputation: 1409

KeyListener starts listening only after Button is clicked

Currently I am trying to integrate MKYong's KeyListener example into an Eclipse RCP app.

I'm getting some weird behavior from a Button I am registering the KeyListener to, it only starts listening to keyboard input after the button was clicked the first time.

I would like it to listen to all keyboard events occurred after it was created. To me it is irrelevant what sort of SWT Control I would have to use.

Any thoughts are appreciated.

Upvotes: 0

Views: 85

Answers (2)

Kuba
Kuba

Reputation: 516

You've added KeyListener to Button. Button is notified of keyEvent when it got focus. If you want to listen for keyboard events in your whole window then add KeyListener to your shell:

shell.addKeyListener(new KeyAdapter()...

If you want global KeyListener add display filter:

Listener listener = new Listener() {

    @Override
    public void handleEvent(Event e) {
        if(e.type == SWT.KeyDown||e.type == SWT.KeyUp) {
            System.out.println("" + e.keyCode);
        }
    }
};
display.addFilter(SWT.KeyDown, listener);
display.addFilter(SWT.KeyUp, listener);

Upvotes: 1

greg-449
greg-449

Reputation: 111217

A control only gets key events when it has the keyboard focus.

If you want to get all key events you can use the addFilter method of Display

Display.getDefault().addFilter(SWT.KeyDown, new Listener() {
   public void handleEvent(Event event)
   {
     // Handle key down event
   }
});

Upvotes: 2

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