How to use context menu for app designer

Question

Paul Johnson 2021-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/1595894-how-to-use-context-menu-for-app-designer

评论： Lee 2023-11-29

Hi,

I'm fiding it really difficult figuring out how the conetext menu works in app designer.

I have 4 listboxes that i have linked to a context menu.

I when i use the conext menu that has a "delete" item that I've created. I want the callback to know which listbox has icicated the contextmenu callback.

Tried to read the documentation but didn't seem to be able to get it working

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Answer 1

Yongjian Feng 2021-11-25

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Each listbox has its own contextmenu, right? You should be able to tell which listbox is calling, right?

Attach a screenshot if this is not the case.

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Paul Johnson 2021-12-17

I had to go with the following solution below which just seems foolish to me.

Lee 2022-8-2

编辑：Lee 2022-8-3

I agree with you, Paul. This is idiotic, and a massive limitation of AppDesigner compared to GUIDE. Similarly, the ONLY callback available for Listboxes is ValueChanged, making it impossible to change any properties of the app after clicking inside a listbox for example (which would solve your problem). Instead we are forced to duplicate context menus, callbacks, and buttons because now they have to be dedicated to each and every listbox - thanks Mathworks!

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Answer 2

Raph 2023-11-29

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编辑：Raph 2023-11-29

There is an easy work around that I use for dynamically built interfaces that you may use here.

Simply assign the target component as the UserData of the uimenu component.

function pop(src,event)
    if strcmp(src.Checked,'on')
        src.Checked = 'off';
        src.UserData.Items = {'Bonjour','Bonsoir'};
    else
        src.Checked = 'on';
        src.UserData.Items = {'Good Morning','Good Night'};
    end
end
cm = uicontextmenu(app.UIFigure);
m = uimenu(cm,'Text','English','Checked','on','UserData',app.ListBox);
app.ListBox.ContextMenu = cm;

Assign the MenuSelectedFcn callback to your custom function

m.MenuSelectedFcn = @pop;

Then, whenever you check the box of the context menu, it will go to the function and change the data of the listbox by assigning new values to the items which are accessible through the src.UserData which is a pointer to the desired target object.

Hope Lee's anger is solved with this answer.