'FocusGainedCallback' doesn't work once figure has axes 2015b

Question

Daniel 2016-5-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/284809-focusgainedcallback-doesn-t-work-once-figure-has-axes-2015b

评论： Nikolaus Koopmann 2022-6-30

I am using this article by Yair to add a 'FocusGainedCallback' onto a MATLAB figure.

The following code works correctly.

 plotFigHandle = figure();
 jFrame = get(plotFigHandle,'JavaFrame');
 jAxis = jFrame.getAxisComponent;
 set(jAxis.getComponent(0),'FocusGainedCallback', @(caller, event) disp('This works great'));

However, as soon as I add a MATLAB axis using the axes() command, the functionality stops working.

 plotFigHandle = figure();
 % adding axes will make this code not function
 axes('Parent',plotFigHandle);
 jFrame = get(plotFigHandle,'JavaFrame');
 jAxis = jFrame.getAxisComponent;
 set(jAxis.getComponent(0),'FocusGainedCallback', @(caller, event) disp('This works great'));

My question is how to I keep the FocusGainedCallback even after I add an axes to my MATLAB figure?

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Answer 1

Arabarra 2017-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/284809-focusgainedcallback-doesn-t-work-once-figure-has-axes-2015b#answer_255051

在 MATLAB Online 中打开

Hi Fabio, the code below (I've pasted it to the Yair's article you mention) did work for me in R2016b, but it's mainly created by trial and error. At least it works if a single axis is defined in the figure. In any case, if you have come across a better solution for the general case, please let me know.

Daniel

hFig = figure; 
h = axes(hFig);
plot(rand(100,1),'Parent',h);
jFig = get(hFig, 'JavaFrame');
jAxis = jFig.getAxisComponent;
n = jAxis.getComponentCount;
disp(n);
jAxis.grabFocus();
drawnow; % will not work without this
n = jAxis.getComponentCount;
disp(n);
set(jAxis.getComponent(n-1),'FocusGainedCallback',@(x,y)disp('in focus'));
set(jAxis.getComponent(n-1),'FocusLostCallback',@(x,y)disp('... out'));

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Arabarra 2017-3-1

damn... just saw that it only works when the figure gains focus through direct interaction with it. If you click on the axis, the figure does gain focus, but the callback doesn't get triggered.

Nikolaus Koopmann 2022-6-30