Step-back button in GUI

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Michal Bella
Michal Bella 2018-5-21
回答： Michal Bella 2018-5-24
Hello. I have a GUI with an image processing functions. My question is, is it possible to do Back button in this gui? I store and update all events in handles. e.g. handles.inputImage = handles.inputImage_gray, handles.inputImage = handles.inputImage_poisson_noise, handles.inputImage = handles.inputImage_gaussian_filter ... The result is grayscale image with Poisson noise which is filtered by Gaussian Filter... And what if i want to do step back button and remove last event (in this case handles.inputImage = handles.inputImage_gaussian_filter ) and then next and then next last event. Is it possible to store handles in listbox and find last value and then assing to this value inverted state? handles.inputImage_poisson_noise = handles.inputImage. I hope u can understand what i want to do. Thank you very much.

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采纳的回答

Jan
Jan 2018-5-21
编辑：Jan 2018-5-21
After the colors have been converted to gray, there is no way to get the colors back. But of course you can store the initial value (image) in a list to which you append the new image after each operation. Then an undo is easy to implement.
% After loading the image
handles.imageList = {imageRGB};
handles.operation = {'original'};
...
% At applying any operation:
image = rgb2gray(image);
handles.imageList{end+1} = image;
handles.operation{end+1} = {'RGB to gray'};
Now an "undo" is:
if numel(handles.imageList) > 1
image = handles.imageList{end-1};
end
and updating the display, maybe removing the last element from the lists, except you want t "redo".
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Jan
Jan 2018-5-21
If you want to undo multiple steps, handles.imageList{end-1} is not sufficient. Add a cursor for the current state:
% For adding a new step:
handles.imageCursor = handles.imageCursor + 1;
handles.imageList{handles.imageCursor} = newImage
handles.operation{handles.imageCursor} = operation
And the undo:
handles.imageCursor = handles.imageCursor - 1;
image = handles.imageList{handles.imageCursor}
Walter Roberson
Walter Roberson 2018-5-21
Using // for comments is not valid MATLAB code. The Octave forum is elsewhere.

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Michal Bella
Michal Bella 2018-5-24
Thank u, but i did it like this and its working perfectly
if numel(handles.imageList) > 1
handles.imageList(end)=[];
handles.RGB = handles.imageList{end};
handles.imageList
imshow( handles.RGB);
guidata(hObject, handles);
end
Big thank for you :)

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