WindowButtonMotionFCN callback slow down the application

Question

Oliver Nann 2018-11-30

2
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/433017-windowbuttonmotionfcn-callback-slow-down-the-application

评论： Cyrano Chatziantoniou 2023-2-21

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.

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Jan 2023-2-21

@Cyrano Chatziantoniou: Does my idea help?

Cyrano Chatziantoniou 2023-2-21

I just updated matlab from 2021a to 2022b. That fixed my problem. If it ever returns, I'll try this solution!

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Answer 1

Jan 2023-2-21

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在 MATLAB Online 中打开

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