Error using rotate3d and context menu in App Designer. Event 'ContextMenuOpening' is not defined for class 'matlab.gr​aphics.Gra​phicsPlace​holder'.

I have an application converted from GUIDE to App Designer. It uses an external library that performs various calculations and data is passed back and forth. In the app a 3D model is displayed on UIAxes and there is a callback function that uses camlight to move the lighting as you rotate the model. As the object is moved the lights are repositioned, and the rotation property is re-enabled. Among other typical UI objects in the app, there is a listbox with a context menu that is used to run various functions based on the options selected in the listbox.

When I open the context menu on the listbox and rotate3d has been enabled using r.Enable = 'on' in the code or by clicking the rotation icon on the figure, the following error is generated:

Error in executing callback registered with ViewModel: Event 'ContextMenuOpening' is not defined for class 'matlab.graphics.GraphicsPlaceholder'

It seems that using the rotate3d object to enable various options causes the problem:

surf(app.UIAxes, peaks);
r = rotate3d(app.UIAxes);
r.ActionPostCallback = {@app.mycallback, app}; % I want to use this property. It alone doesn't error
r.Enable = "on"; % This generates the error

I'm not sure why, but using the function this way doesn't generate the error message.

surf(app.UIAxes, peaks);
rotate3d(app.UIAxes, "on") 
% Is something like this possible?
% rotate3d(app.UIAxes, "on", "ActionPostCallback", {@app.mycallback, app}) 

However, I want to use the ActionPostCallback property. Why might the rotate3d object cause this error when opening the context menu?

I believe I've reduced the error down to the minimum pieces causing the problem and have a working example attached.

Steps to reproduce:

1. With line 31 commented out and lines 35-37 uncommented, run the application
2. Right click on the listbox to generate the error
3. Go back to code, comment out lines 35-37, uncomment line 31, and rerun the application
4. Right click on the listbox and see that no error is generated

Note: you can invoke the callback function in step 2 by rotating the figure.

Thanks for any help

Answer 1

[ts]

Based on communication with Mathworks support, this error is caused by a bug in the internal Matlab function "modeWindowButtonDownFcn." I've attached a workaround from the support team that fixes this issue.

Replace the "modeWindowButtonDownFcn.m" file in the folder \matlab\toolbox\matlab\uitools\+matlab\+uitools\+internal\@uimode with the m file attached.

It was mentioned that this bug will be fixed in a later release.