Qt 4.3: Undo Framework

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# Undo Framework

Files:

- demos/undo/commands.cpp
- demos/undo/commands.h
- demos/undo/document.cpp
- demos/undo/document.h
- demos/undo/mainwindow.cpp
- demos/undo/mainwindow.h
- demos/undo/main.cpp
- demos/undo/undo.qrc

This demo shows Qt's undo framework in action.

Qt's undo framework is an implementation of the Command pattern, which provides advanced undo/redo functionality.

To show the abilities of the framework, we have implemented a small diagram application in which the diagram items are geometric primitives. You can edit the diagram in the following ways: add, move, change the color of, and delete the items.