How can I set an ActionPostCallback of zoomInteraction from default axes toolbar (UIAxes / Appdesigner)?

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Benjamin Hackl 2020-8-10

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https://ww2.mathworks.cn/matlabcentral/answers/577618-how-can-i-set-an-actionpostcallback-of-zoominteraction-from-default-axes-toolbar-uiaxes-appdesign

评论： Benjamin Hackl 2020-8-14

Hey guys,

is there a way to set an ActionPostCallback / ActionPreCallback in the default zoomInteraction of default axes toolbar? In specific, I would like to update several user input fields containing the axes limits after zooming in a UIAxes.

In the past, when I used GUIDE, I had the possiblity of setting the ActionPostCallback of the zoom object:

h = zoom;
h.ActionPostCallback = @mypostcallback;

How can I do that in Appdesigner?

Thanks for your help and kind regards,

Benjamin

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Answer 1

Gouri Chennuru 2020-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/577618-how-can-i-set-an-actionpostcallback-of-zoominteraction-from-default-axes-toolbar-uiaxes-appdesign#answer_479451

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Hi Benjamin,

You can execute zoom functionality using 3 different types of call backs ButtonDownFilter, ActionPreCallback, ActionPostCallback.

You can create callbacks for pre and post-buttonDown events for zoom mode objects to trigger, as follows

h = zoom;
h.ActionPreCallback = @myprecallback;
h.ActionPostCallback = @mypostcallback;
h.Enable = 'on';
%
function myprecallback(obj,evd)
disp('A zoom is about to occur.');
%
function mypostcallback(obj,evd)
disp('A zoom has occured.');

Hope this Helps!

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Benjamin Hackl 2020-8-14

在 MATLAB Online 中打开

Hi Gouri,

thanks for you immediate answer. Originally I tried to immplement a ActionPostCallback (UIAxes in Appdesigner) in two different ways:

1) Modification of default zoomin function of standard axestoolbar: unfortunately the default object does not have properties like: ActionPreCallback / ActionPostCallback

2) Creating my own zoom-button on the axestoolbar with axtoolbarbnt() function with:

h = zoom(UIAxes_name)

Apperently the zoom() function does not give any function handle back in Appdesigner. Means, I do not have access to their callbacks, like: h.ActionPostCallback = @mypostcallback;

Meanwhile I found the following community entry:

https://de.mathworks.com/matlabcentral/answers/480749-get-zoom-handle-for-uiaxes-axes-when-using-app-designer

For the moment my intention to connect a function to zooming action in Appdesigner seems to be impossible.

Do you have any further idea / advices?

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