Qt Item Delegates - A Framework

QListView, QTableView and QTreeView can all be configured via a number of roles from the models, e.g. BackgroundRole, ForegroundRole, FontRole, and TextAlignmentRole. This often means that no additional configurations of the views are needed.

However, if you want more control over how the data is presented, you can get that by implementing a delegate.

The question, however, is: Which delegate should you subclass from - QItemDelegate or QStyledItemDelegate? The documentation argues the latter, but the answer isn't so black and white. In this video I'll look into many details, and at the end implement a new super class which is super easy to extend.

0:00 Introduction
0:47 When do you /not/ need a delegate?
2:33 Rendering Money instances in a delegate without a custom delegate
4:21 Difference between QItemDelegate and QStyledItemDelegate
6:56 QStyledItemDelegate with Oxygen style
7:59 Subclassing QStyledItemDelegate
11:00 Debugging into QStyledItemDelegate
15:00 Subclassing QItemDelegate
19:06 Paint negative numbers in red
20:55 QWAMDelegate
22:49 What's in the next two episodes?

Links:
Avoid wrapping the money instance in QVariant::fromValue() -    • Using Custom Types with Model/View  

The example code showcased in this video is available here: https://github.com/KDAB/kdabtv/tree/m...

All Qt Widgets and more videos:
   • Qt Widgets and more  

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

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