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List:       kde-devel
Subject:    Problem with KWidgetItemDelegate on KDE 4.2 when compiled against 4.1
From:       Stefan Majewsky <majewsky () gmx ! net>
Date:       2009-03-22 22:51:54
Message-ID: 200903222351.57012.majewsky () gmx ! net
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> Hi all,

my application KaNDAS [1] uses in its new version a KWidgetItemDelegate-
derived view delegate for its main view. I've developed and tested everything 
on my KDE 4.2.1 installation (on openSUSE 11.0), but do still call the 
deprecated KWidgetItemDelegate::paintWidgets inside the reimplementation of 
QAbstractItemDelegate::paint to retain compatibility to KDE 4.1. Everything 
worked well on my 4.2 installation.

Now I have built packages for openSUSE 10.3 through 11.1, and these packages 
are built on top of a KDE 4.1.3 installation. I did not test them on another 
4.1 installation, but I know that these packages are not working properly on 
my 4.2.1 installation. On startup, the following debug output appears:

> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotRowsInserted(QModelIndex,int,int)
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotRowsAboutToBeRemoved(QModelIndex,int,int)
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotDataChanged(QModelIndex,QModelIndex)
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotLayoutChanged()
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotModelReset()
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotRowsInserted(QModelIndex,int,int)
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotRowsAboutToBeRemoved(QModelIndex,int,int)
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotDataChanged(QModelIndex,QModelIndex)
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotLayoutChanged()
> Object::connect: No such slot 
Kandas::Client::ViewDelegate::_k_slotModelReset()

What I observe is that the view does not update at all, it only displays the 
initial state which the model had at the time when the view was shown. Note 
that my implementation renders everything through a big widget, so I cannot 
tell if only the widgets do not update. I do only know that selection 
backgrounds are still painted properly.

The code of the Kandas::Client::ViewDelegate can be found at [2]. Did I use 
the KWidgetItemDelegate incorrectly, or is this a real regression?

Greetings
Stefan

[1]http://code.google.com/p/kandas/
[2]http://code.google.com/p/kandas/source/browse/trunk/kandas/viewdelegate.cpp


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