ho to implement Undo/Redo in a Matlab App

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Sylvain
Sylvain 2025-5-7
评论： Sylvain 2025-5-8
I am after a good snippet code that would allow to have some Undo/Redo function.
I have found this intersiting one: uiundo - Matlab's undocumented undo/redo manager - Undocumented Matlab But it seems that uiundo might be removed at some point. I am happy to keep exploring this method, but I would like to find something more general in term of time history.
How to capture previous actions/values from the gui? Should I implement something like having a private property:
app.Data
app.DataBackwardStep
app.DataForwardStep
on new action:
  • DataBackwardStep(end+1) = app.Data
on undo:
  • app.DataForwardStep = app.Data
  • app.Data = app.DataBackwardStep(end-1)
  • app.DataBackwardStep(end) = [ ]
on redo
  • app.Data = app.DataForwardStep
  • DataBackwardStep(end+1) = app.Data
happy to see what others have already implemented

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Hitesh
Hitesh 2025-5-8
编辑：Hitesh 2025-5-8
Hi Sylvain,
Absolutely, you’re on the right track! Implementing a custom undo/redo stack is a robust, general approach, especially when you want to avoid relying on undocumented or deprecated features like "uiundo". Following is a general undo/redo pattern you need to adapt for your MATLAB GUI app.
You maintained two stacks:
  • Undo Stack (DataBackwardStep): stores previous states.
  • Redo Stack (DataForwardStep): stores states you can return to after an undo.
I have implemented a similar functionality and attached the .mlapp file for your reference. Please review the code section of the app; it will give you a better understanding of the implementation.
Kindly ensure the following points for the usecase of this application.
  • State Storage: If your data is large, consider storing only the differences (deltas) or using lightweight representations.
  • Limit Stack Size: To save memory, you might cap the stack size (e.g., keep only the last 20 actions).
  • GUI Update: After undo/redo, update any relevant UI components to reflect the restored state.
For more information regarding the "uiButton" in App Designer. Kindly refer to the following MATALB documentation:
https://www.mathworks.com/help/matlab/ref/uibutton.html
  1 个评论
Sylvain
Sylvain 2025-5-8
Thanks, @Hitesh, indeed I need to limit the stack storage (will be set by user parameter in the app). I will need to test the stack size to disable the undo/redo buttons.
I will work around what you suggested, Thanks again

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