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Joint presentation with Till Adam and Marius Bugge Monsen. The model/view framework is one of the most powerful areas of Qt4, but also one of the most complex. It is elegant in its design, but proves to be difficult to master for many who try in practice. While a lot of effort went into anticipating how developers would use and potentially mis-use this API, real world usage patterns, best practices and common errors turn out to be interestingly deviant. Marius, who was part of the original architecture team behind these classes, and Till, who has taught the concepts to varied audiences and seen a wide range of real world applications of them both in his work on KDEPIM and as a consultant at KDAB, combine their experiences in this presentation to provide a unique joint perspective.
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I can see your house from here
Part 1
7.5 Years
79 Files
32957 Lines Of Code
The Beginning
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Jobs fixed
reggiereggie-piefke2002/12/03 14:43:32nothing yet-
espenrespenr-deimos2002/12/04 19:30:30Added a FileTableModel and changed main to test it.Reads the columns in the astronomy_large.txt backwardsand will reread the file if you edit it. (Just touch it)-
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mmonsenmmonsen-elysium2002/12/05 15:37:13QItemModel subclass that implements a directory tree as a data source.-
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A Rush of Creativity
2002/12/09
2002/12/13
2002/12/16
2002/12/18
2002/12/20
2003/01/06
2003/01/07
2003/01/09
2003/01/10
2003/01/016
2003/01/24
2003/02/03Last commit by reggie.
2003/03/04espenr releases Qt 3.1.2
Decisions
mmonsenmmonsen-elysium2003/10/23 16:49:51Add QObjectRepository. This is an object pool to avoid new/deletes.Use it on MemModelItems (for testing).-
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mmonsenmmonsen-elysium2003/10/26 16:08:11Introduce the alt_ classes.They are the begining of the implementation of item views usingQModelIndex instead of QGenericModelItem.The model items are just too heavy.-
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haraldharald-morpork2003/11/11 21:26:08Here we go - first implementation of a database model-
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espenrespenr-phobos2004/01/21 11:49:57move new itemviews into qt4 (no they are not finished)-
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espenrespenr-phobos2004/02/11 20:06:25changed QGenericItemModel to have roles (Display, Decoration, ToolTipetc) and removed the use of "elements" everywhere.<snipp>-
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mmonsenmmonsen-elysium2004/02/25 17:06:16QGenericItemModel -> QAbstractItemModel.-
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Complexity
mmonsenmmonsen-elysium2004/05/04 18:22:39Add QPersistentModelIndex.-
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rraggirraggi-rabagast2004/07/01 17:13:10Initial implementation of the new Property Editor-
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2004/08/21 - 29Akademy 2004
mmonsenmmonsen-onyx2004/08/26 22:17:16Add QProxyModel.The idea is that you can subclass this model and use it for filtering and sorting.-
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mmonsenmmonsen-elysium2004/10/22 19:25:11Add a model pointer to QModelIndex.-
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Towards the Goal
espenrespenr-phobos2005/02/27 22:31:42branch 4.0 from main-
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2005/06/28Qt 4.0 Released!!!
Work Continues
I can see your house from here
Part 2
Marius, Espen, I want your baby
Disclaimer:
the five stages of grief
Denial
Anger
Bargaining
The Mutz Axiom
“the solution to every engineering problem is QProxyModel”
View
Stuff
Model
political correctness proxy
sorting proxy
View
Stuff
Model
sorting proxy
political correctness proxyStuff
Depression
- excessive minimalism
- missing error handling guidance
- hard to make transactional
- hard to implement undo
- tree complexity imposed on the table case
- treacherously public internalId/internalPointer
- unfortunately named QStandardItemModel
- "thou shall not work on foreign indexes" not
enforced (NVI?)
- MVC, but not really
Acceptance
QAbstractItemView
QAbstractItemModel
political correctness proxy
sorting proxy
Controller ModelStuff
View
[email protected]@kdab.com
Image Credits:
Stuck in Customs on flickrMichelle Smorgon on flickr
