[PyQt] Resizing index widgets

[Detlev Offenbach]

Hi Mads,

why are you using QTreeView? I would use QToolbox for such a layout.

Regards,
Detlev

On Tuesday 29 January 2013, 22:31:14 Mads Ipsen wrote:

Hi,

We develop a tool for manipulating atomic structures and have embedded all the 
manipulation widgets in a panel bar (widget on the right in attached 
screen0.png). The Panel bar has expandable buttons, which upon expansion 
display different interfaces for manipulating the atomic structures.

The whole thing is implemented using a MVC approach using a QTreeView and an 
overloaded QItemDelegate class used for handling painting of the buttons, 
sizeHints, etc. The widget interfaces however, are displayed by setting 
setIndexWidget() on the tree view. 

This works fine if the widgets have a fixed size. However if the atomic 
structure changes (molecule to crystal), previously hidden GUI elements may be 
shown in the widget, which gives rise to a compressed (bad) layout since the 
index widget has a fixed size (screen1.png).

The only way I could fix this was to use an idle time, that keeps triggering 
the emission of the signal

sizeHintChanged(const QModelIndex & index)

from the delegate. This immediately triggers a smooth update of the index 
widget resulting in screen2.png. From a user perspective it works fine, but to 
me it appears somewhat hacky. Is there eg. a way to monitor layout changes in 
visible index widgets?

Best regards,

Mads


-- 
+-----------------------------------------------------+
| Mads Ipsen                                          |
+----------------------+------------------------------+
| Gåsebæksvej 7, 4. tv |                              |
| DK-2500 Valby        | phone:          +45-29716388 |
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-- 
Detlev Offenbach
detlev at die-offenbachs.de
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