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| /*! |
| \example tools/undo |
| \title Undo Framework |
| \ingroup examples-widgets-tools |
| |
| \brief This example shows Qt's undo framework in action. |
| |
| \image undodemo.png |
| |
| 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. |
| */ |