[news.eclipse.platform.swt] Re: JFace Dialog - change default focus

[Matthew Hall <matthall@xxxxxxxxxxxxxxxxx>]

Joe Gagnon wrote:
> I believe I was able to set up logic that allows this to work. If I 
> understand it right, the listener is basically mapping Return button 
> presses to Tab button presses. Is this correct?
>
> The only problem with this is that when the focus finally reaches the 
> dialog OK button, pressing Return just moves focus on to the next item.
>
> Is there a way to simply reset the "default" button (usually OK) of the 
> dialog to another button of our choosing? Keep in mind that the dialog 
> is just a container for a Composite that contains the button (or other 
> widget type) that we would like to set as the new default.
>
> I tried looking at Shell.setDefaultButton(), but wasn't able to get it 
> to work.

Yes, shouldOverrideTraversal is your method, and its implementation 
depends on what you want to do.  My guess is that it should return false 
whenever event.widget is a Button(SWT.PUSH) or the widget belongs to 
another shell.

You can cause the filter to be removed as the dialog is closed by adding 
a SWT.Dispose listener to the composite created in createDialogArea:

composite.addListener(SWT.Dispose, new Listener() {
  public void handleEvent(Event e) {
    display.removeListener(SWT.Traverse, overrideTraversalListener);
  }
});

Just a thought, if your application creates all your form fields from 
one factory object, it might be simpler to add a SWT.Traverse listener 
to each form widget within that factory method rather than filtering all 
events on the display.

Matthew