WindowButtonMotionFCN callback slow down the application
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I have a GUI with several objects ( axes, tables, checkboxes, labels ...), when i move over the axes i read the mousposition with the WindowButtonMotionFCN callback to show the data continously. The WindowButtonMotionFCN is only available for the whole figure so the callback is permantly firing when i move the mouse in the application. My problem now is when i move the mouse over the table or when i pushed a button, than it is so slow, sometimes over 10 seconds with no response. I checked the lag with the profiler and found out that the lag is from the WindowButtonMotionFCN because the event is permantly fired and caused a queue of WindowButtonMotionFCN. I tried to perpare the interrupte-properties, but it changed nothing.
Is there a opportunity to give a callback only for a object and not for the whole figure?
Has someone similar expericence or can give me a idea how to solve the problem?
Thanks in advance.
3 Comments
Cyrano Chatziantoniou
on 21 Feb 2023
I just updated matlab from 2021a to 2022b. That fixed my problem. If it ever returns, I'll try this solution!
Answers (1)
Jan
on 21 Feb 2023
Try if rejecting repeated calls solve the delay. See e.g. https://www.mathworks.com/matlabcentral/answers/570829-slow-sizechangedfcn-or-resizefcn#answer_475105
function WindowButtonMotionFCN(FigH, EventData)
persistent blockCalls % Reject calling this function again until it is finished
if any(blockCalls), return, end
blockCalls = true;
moved = true;
while moved % Repeat until the motionhas stopped
pos = get(FigH, 'CurrentPoint');
... Your code here
moved = ~isequal(pos, get(FigH, 'CurrentPoint'));
end
blockCalls = false; % Allow further calls again
end
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