[Qt-interest] General problem with selection in QAbstractItemView classes (QListXXX QTreeXXX etc)

[Pritam Ghanghas]

On Wed, 2011-06-29 at 17:25 +0530, Zeljko wrote:
> Hi,
> Just found an interesting problem with selection behaviour inside 
> QAbstractItemView classes (no matter which class it is QListView, QListWidget, 
> QTreeView, QTreeWidget ... even created my own QTreeView with QStandardItemModel 
> and my QItemSelectionModel etc etc). I've used selection signals for such 
> purpose but now I need accurate information (need it for my QTreView + 
> QStandardItemModel) when mouse is pressed so:
> 
> 1.MousePress event in itemView viewport
> 2.You can clearly see that item is selected (colored blue, focus rect around it 
> ...)
> 3.Ask that item is it selected ... NO ?!?
> 4.Ok ask Selection model about that selection ? NO ?!?
> 
> 5.MouseRelease .... ahh item says that's selected :( ...it's too late.
> 
> That's pretty nasty. You can see selected item but code says that item isn't 
> selected :(

May be two layered selection model has something to do with it.
Take a look
http://doc.qt.nokia.com/latest/qitemselectionmodel.html#details

I am not sure though.


> I can understand such behaviour in case when item is checkable and mouse is 
> inside checkbox (so we cannot trigger such change because user can move mouse 
> and release it ... checkbox shouldn't be updated...that works correct), but 
> simple selection is wrong, because selection is updated when mouse is released 
> and that's too late (it's already selected *visually* by mousepress).
> 
> IMO, if user see selected item on the screen , our item data should be already 
> updated.
> 
> Maybe I should use QTreeView event filter not viewport ? 
> 
> Any clues / comments ? Should I open an issue about this ?
> 
> zeljko
> 
> 
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