Painter example Undo/Ctrl-Z

by Martin Fitzpatrick Last updated PyQt5 FAQ
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Paapu | 2020-05-10 20:21:13 UTC | #1

I tried to figure out how to cancel a part of a drawing (using subsequent ctrl-Z or something). Would this be doable? (I could not make it...)

martin | 2020-05-10 20:22:07 UTC | #2

Hi @Paapu it should be! One simple way would be to take a snapshot of the current pixmap canvas on every mouse down (start drawing) and store this in a temporary variable. Then when Ctrl-Z is pressed (detected using a QAction) you can copy that back over the current canvas.

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Painter example Undo/Ctrl-Z was written by Martin Fitzpatrick .

Martin Fitzpatrick has been developing Python/Qt apps for 8 years. Building desktop applications to make data-analysis tools more user-friendly, Python was the obvious choice. Starting with Tk, later moving to wxWidgets and finally adopting PyQt.

Painter example Undo/Ctrl-Z was published in faq on (updated ) . Feedback & Corrections welcome in our public issue tracker.

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