My treecontrol has special actions on a "double-click", therefore i wish not to have an expanding / collapse action of the item.
I use notification handlers:
TVN_ITEMEXPANDING
NM_DBLCLK
1. It seems the expand / collapse action is also performed on a double-click, too.
2. It is always sent by windows before the dbclick-action.
My requirement: The decision wether an item should be changed its expand/collapse state is based on the double-click.
How can I spy the "double click" message in my OnItemExpanding() event handler ?
If I would know for the double-click, my little problem would be solved and i can return these values
*pResult = 0 (expand/collapse)
*presult = 1 (no action)
Is there a simple solution ? Thanks.
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the thing is that some items need to be expanded. Those are not handled in the double click handler.
I could handle all in the double.click handler, but items also get expanded by clicking once on the "cross" symbol. Therefore i cannot set *pResult = 1.
To follow your suggestions, I guess i have to handle "single clicks", To do the expand/collapse myself.
Any additional comments welcome!
Windows will always generate a single click before a double click.
Raymond Chen provides some interesting background on the whole problem here (for triple clicks)
http://blogs.msdn.com/oldn
and here
http://blogs.msdn.com/oldn
where he shows some code that could help you.
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by: itsmeandnobodyelsePosted on 2009-09-03 at 06:31:06ID: 25250431
>>>> How can I spy the "double click" message
You have to block the TVN_ITEMEXPANDING message by returning success == 1 (handled) and do the expanding in the NM_DBLCLK notification handler.