Review Request: Allow KWidgetItemDelegate::createItemWidgets to know what index corresponds to the widgets

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This review has been submitted with commit a1a697436e16f86a545d0aced1f35dbd16772856 by eli mackenzie.

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On April 24, 2011, 7:49 a.m., Eli MacKenzie wrote:
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> http://git.reviewboard.kde.org/r/101219/
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> (Updated April 24, 2011, 7:49 a.m.)
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> Review request for kdelibs and Rafael Fernández López.
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> Summary
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> Ideally KWidgetItemDelegate::createItemWidgets would take a const QModelIndex& argument. Unfortunately its public API, so the signature cannot be changed until KDE5. Additionally, its pure virtual so the option of adding a createItemWidgets(const QModelIndex&) method won't work either.
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> Instead, I've added a dynamic property called "creatingWidgetForIndex" to the delegate, that is only present while the widget pool is creating widgets. This means the only change kwidgetitemdelegate.h is documentation. The QModelIndex could be stashed on one of the d-objects and made available through an accessor, but that would mean that d-object would have to carry a QModelIndex that would be invalid almost all of the time.
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> Another benefit is that an application where this feature is desired (for KDE < 4.7) only has to include an the new version of kwidgetitemdelegatepool.cpp, which is easy to keep in sync with kdelibs.
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> This change allows you to set a delegate for a particular column in the model, and put a type of widget in each row that works best for the data.
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> Diffs
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>   kdeui/itemviews/kwidgetitemdelegate.h 58dd60868f476d925f3abd53e67b22c1ed7149ac 
>   kdeui/itemviews/kwidgetitemdelegatepool.cpp b287584a594e97a091f96447386a588acb08c59e 
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> Diff: http://git.reviewboard.kde.org/r/101219/diff
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> Testing
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> In my test app I started with a model that only included 5 rows, and would only create a widget for row 2. As long as KWidgetItemDelegate::updateWidgets doesn't assume that the QList<QWidget*> argument has something in it, all is well. After implementing this change I caused the model to change the type of widget for each row per the index pulled out of the property, again keeping updateWidgets in sync, and have encountered no problems.
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> Screenshots
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> with no filtering
>   http://git.reviewboard.kde.org/r/101219/s/136/
> With filtering
>   http://git.reviewboard.kde.org/r/101219/s/137/
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> Thanks,
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> Eli
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