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After adding a selectionListener tree items don't expand on double-click [message #448064]

Thu, 30 December 2004 04:32

Eclipse User

Originally posted by: roberto.nucera.informatica.com

tree.addSelectionListener( new SelectionAdapter()
{

});

After adding this code the tree items no longer expand/collapse when the
user double-clicks on an item.

Can anyone help?

thanks,

roberto

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Re: After adding a selectionListener tree items don't expand on double-click [message #448163 is a reply to message #448064]

Tue, 04 January 2005 17:17

Steve Northover

Messages: 1636
Registered: July 2009

Senior Member

Yes. On some platforms (for example, Windows), the default action when the
user double clicks on an item is to expand or collapse the item. When an
application program adds an SWT.DefaultSelection listener, this is disabled.
Why? If this weren't the case, then the tree would expand and the default
selection listener would run, causing two actions to happen. When you add a
SelectionListener, you are hooking both SWT.Selection and
SWT.DefaultSelection. The solution is it use an untyped listener and listen
only for SWT.Selection.

"Roberto Nucera" <roberto.nucera@informatica.com> wrote in message
news:cr00ci$uso$1@www.eclipse.org...
> tree.addSelectionListener( new SelectionAdapter()
> {
>
> });
>
> After adding this code the tree items no longer expand/collapse when the
> user double-clicks on an item.
>
> Can anyone help?
>
> thanks,
>
> roberto
>
>

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