Listening for a property to be linked to.

Question

Matt 2012-7-25

2
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44548-listening-for-a-property-to-be-linked-to

Hi all,

Simple question - what's the best way to listen for a property of one object being linked with the property of another object?

I've been attempting to perform a given action when a property of a graphics object is changed. This is fairly simple ie. for figure visibility -

setappdata(gcf,'Visible_Listener',addlistener...
(gcf,'Visible','PostSet',@Visible_CallBack))

However, when properties are linked, it seems that changes to the property of one of the linked objects can modify the linked property of the others without triggering the listener. Is there a good way to circumvent this issue so that callbacks are triggered when a linked property is changed?

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Answer 1

Sean de Wolski 2012-7-25

1
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https://ww2.mathworks.cn/matlabcentral/answers/44548-listening-for-a-property-to-be-linked-to#answer_54610

编辑：Sean de Wolski 2012-7-25

It's working for me:

%The example from doc linkaxes

load count.dat

figure

ax(1) = subplot(2,1,1);

bar(ax(1),count(:,1),'g');

ax(2) = subplot(2,1,2);

bar(ax(2),count(:,2),'b');

linkaxes(ax,'x');

addlistener(ax(2),'XLim','PostSet',@(src,evt)disp('hello world'));

set(ax(1),'XLim',[4.5 9.5])

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Matt 2012-7-26

Ok, so actually it doesn't break down at all. Just the callback can't assume that the object generating the callback is the current object. Simple enough fix. Thanks so much for setting me straight!