MATLAB Answers

Slow SizeChangedFcn or ResizeFcn

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Jan
Jan on 26 Jul 2020 at 17:54
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Answered: Jan on 4 Aug 2020 at 15:52
When a SizeChangedFcn or ResizeFcn takes some time, the figure size can be changed, until the display is updated. Example:
functionResizeTest
FigH = figure(“单位”,'Pixels');
siz = get(FigH,'Position');
AxesH = axes(“单位”,'Pixels','Position', [5, 5, siz(3:4)-10],'Box','on');
set(FigH,'ResizeFcn', {@resize, AxesH});% Same for SizeChangedFcn
end
functionresize(FigH, EventData, AxesH)
siz = get(FigH,'Position');
pause(1.0);% Of course here are some real calculations
set(AxesH,'Position', [5, 5, siz(3:4)-10]);
end
The real calculations are e.g. a re-wrapping of a large text displayed in the axes object.
During the mouse is moved to change the figure, the display is smartly changed, but when the axes object is adjusted, its size is likely out of date.
什么是好的策略来解决这个问题? It would be best to trigger the callback, when the mouse button is released. But in Matlab 6.5 to 2018b (most likely newer versions also) the motion of the mouse calls the callback already. Setting the figure property Interruptible to 'on' and the BusyAction to 'queue' does not solve the problem - this is the default already.

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Answers (2)

Jan
Jan on 29 Jul 2020 at 11:29
Edited:Jan on 29 Jul 2020 at 21:15
One solution is to ignore the built-in resize methods and use a specific WindowsButtonDownFcn to emulate a resizing. But reinventing the wheel is awkward.
Another idea is a checking the actual figure size at the end of the callback and start it again in a recursion or loop - not satisfying also:
functionresize(FigH, EventData, AxesH)
doResize = true;
whiledoResize
siz = get(FigH,'Position');
pause(1.0);% Of course here are some real calculations
set(AxesH,'Position', [5, 5, siz(3:4)-10]);
drawnow;
doResize = ~isequal(siz, get(FigH,'Position'));
end
end
Of course, this is more a workaround than a solution. It would be much nicer to catch the Mouse-Release event after the resizing of the window was triggered.
Perhaps this is a question for Yair and the undocumented Java methods.

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Jan
Jan on 4 Aug 2020 at 15:52
The first version was not sufficient in all cases. In addition it is required to prevent a repeated entering of the code:
functionresize(FigH, EventData, AxesH)
persistentblockCalls% Reject calling this function again until it is finished
ifany(blockCalls),return,end
blockCalls = true;
doResize = true;
whiledoResize% Repeat until the figure does not change its size anymore
siz = get(FigH,'Position');
pause(1.0);% Of course here are some real calculations
set(AxesH,'Position', [5, 5, siz(3:4)-10]);
drawnow;
doResize = ~isequal(siz, get(FigH,'Position'));
end
blockCalls = false;% Allow further calls again
end
I'm surprised that nobody else seems to have this problem.

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R2018b