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    41 

    42 /*!

    43     \example demos/undo

    44     \title Undo Framework

    45 

    46     This demo shows Qt's undo framework in action.

    47 

    48     \image undodemo.png

    49 

    50     Qt's undo framework is an implementation of the Command

    51     pattern, which provides advanced undo/redo functionality. 

    52 

    53     To show the abilities of the framework, we have implemented a

    54     small diagram application in which the diagram items are geometric

    55     primitives.  You can edit the diagram in the following ways: add,

    56     move, change the color of, and delete the items.

    57 */