[Qt-interest] QTree* with custom widgets

Tue Mar 17 15:59:35 CET 2009

Malyushytsky, Alex schrieb:
>>> Now the case with setIndexWidget/setItemWidget is that the size of the QTreeWidgetItem (or whatever you'd like to call it) doesn't change as long as I don't collpase and reopen the tree again.
>>>       
>
> This means that all you need is to force QTreeWidget to update when you done editing (you will have to figure out when yourself, cause it depends on your widget)
>   
actually had the same idea first (see below)
> I am sure it should be a way.
> You could always do the following, cause it is equivalent of what you were doing with probably even completely acceptable graphics update.
> - setUpdatesEnabled ( false );
>  - collapse/ expand
>    or removeItemWidget and insert it back (should inforce updating this widget.
> - setUpdatesEnabled ( true );
>   
tried it.. didn't work.. even tried to recreate the signals emitted when 
the user interacts with the tree.. far to impossible because you'd have 
to get the right cursor positions and such stuff...
didn't work means: nothing changes (doesn't resize like it does when the 
user collapses and expands the tree)
> But I believe there should be direct way to inforce QTreeWidget to update
>
> I don't have access to my development machine right now, so can't test it , but hope can give you some hints.
>
> 1. check that uniformRowHeights () is false. 
>   
checked
> 2. try call update() on QTreeWidget
>   
didn't do anything. also tried to use updateGeometry.. didn't work, 
updateGeometries (sounds good imo) also doesn't work, as expandAll and 
dataChanged don't work :-(
> 3. Finally check what is called in QAbstractItemView::setIndexWidget(...)
> (QT source) to update geometry. It should be  
> QAbstractItemView::dataChanged ( ... ).
> Call it yourself. This probably is the best way and should work.
>   
as stated above: it doesn't work -- furthermore I can't get a valid 
index (using a QTreeWidget) -- but maybe this was because it was just a 
quick and dirty hack and I overlooked something
> Regards,
>    Alex
>  
>  
> ________________________________________
> From: Bernhard Friedreich [mailto:friesoft at gmail.com] 
> Sent: Monday, March 16, 2009 3:17 AM
> To: Malyushytsky, Alex
> Subject: Re: [Qt-interest] QTree* with custom widgets
>  
> Because the widgets needs the ability to be resized! (dynamic content)
> >From the Qt docu:
> This function should only be used to display static content in the place of a tree widget item. If you want to display custom dynamic content or implement a custom editor widget, use QTreeView and subclassQItemDelegate instead.
>  
> 2009/3/16 Malyushytsky, Alex <alex at wai.com>
> Why QTreeWidget::setItemWidget is not working for you?
>
> void QTreeWidget::setItemWidget ( QTreeWidgetItem * item, int column, QWidget * widget )
>
> Regards,
>    Alex
>
>
>
>
> ________________________________________
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Bernhard Friedreich
> Sent: Sunday, March 15, 2009 1:44 PM
> To: qt-interest at trolltech.com
> Subject: [Qt-interest] QTree* with custom widgets
>
> Hey!
>
> I've been fighting with a problem for quite some time now and I've now reached the point from which on I have now idea what is left, I could try. I really hope you guys (and girls ^^) can help me.
>
> I want to use a QTreeView or QTreeWidget (doesn't really matter) with custom widgets.
>
> I've got those requirements:
> * Custom widgets (different rows = different widgets, 0st column: normal description text, 1st column: the widget)
> * dynamic resizing (adding widgets at runtime to the custom widget)
> * the widgets must be shown all the time (NOT JUST FOR EDITING!)
> I've tried setIndexWidget, setItemWidget, a QGraphicsView and ItemDelegates with the paint method..
>
> Already searched on many forums, google and mailings lists but nothing useable turned up.
>
> Here's the thread where I asked for help (provides some more information): http://www.qtforum.org/article/27021/qtree-with-custom-qwidgets.html
>
> I'd REALLY appreciate if you could help me... I'm totally lost atm...
>
> Thanks for your help :-)
>
> Best regards,
> Bernhard Friedreich, Qt fan and developer :-P
>
>
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