Скачать или смотреть A Complete Proxy Model Implementation - Part 1

One of the most complex things in Qt's model/view framework is the implementation of proxy models.

In this episode, I'll show an almost complete implementation of a proxy model which reverses its rows but, at the same time, also gives hints for where and when you can cut corners.

Links:
Proxy model collection in KDToolbox: https://github.com/KDAB/KDToolBox/tre...
Proxy model collection from KDE: https://api.kde.org/frameworks/kitemm...
Episode on CHECK_index:    • Checking Your QModelIndex(es)  
Episode on unit testing:    • Unit Testing from Qt Creator  

0:00 Introduction
2:06 Implementing the QAbstractProxyModel API
9:00 Running the code without listening to signals
12:13 It is OK to not go further than this!
14:17 emitting beginResetModel and endResetModel is sometimes enough
16:38 listening to dataChanged signal
19:01 rowsAboutToBeInserted, rowsInserted, ... signals
22:14 headerDataChanged, modelReset, modelAboutToBeReset signals
23:08 Unit testing the model
27:26 The MasteSpy class - why is it needed
29:31 The MasterSpy class - how is it used
31:19 Careful proxy models may crash!

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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