edit zoom contex menu

Hello all,

Is there any way to edit the zoom built-in conext menu? I want to add an option to exit zoom mode.

I dont want to create a custom context menu. I want just to edit the original one.

I did it this way:

z = zoom(h.FIG);
z.Enable = 'on';
zoomMenu = findobj(h.FIG, 'Tag', 'ZoomContextMenu');
MENU_exitZoom = uimenu(zoomMenu, 'Text', 'Exit zoom mode', 'Callback', @C_exitZoomMode);

The problem is that the context menu handle is empty if I dont open the menu first with the mouse.

After that, the handle is there, and I can sucessufly add my new option, and it indeed exits zoom mode.

Mathworks states that you cannot add items to the built-in zoom context menu, but you can replace it with your own. But since I did it sucessfully, I suppose this is not entirely true. The only problem is that the menu handle doesn't appear if I dont make the menu show up at least once.

Anyway, I want to create a menu that has all the options of the built-in menu, but with one extra option created by me. Any way for doing this?

Regards,

André

[Adam]

Extending or truncating Mathworks' default graphics/GUI objects does always seem to be extremely difficult. I have had similar problems trying to programmatically add a toolbar that is just a subset of the default one for a figure.

Looking in my own code I ended up writing a full custom context menu for zooming and panning functionality when I wanted to do something like you are, reprogramming callbacks to do essentially the same as the defaults in many cases too, but it was a lot of effort and seems to span 3 classes. Certainly I didn't find a way to edit the existing menu in a way I wanted.

[André]

The only alternative I have seen is to create a callback when you click the axes to change the menu. It should work since it the menu is already open. But then whats the surprise: you can not capture mouse events while in zoom mode.

Seems the only way is to program each zoom option individually as you said. Its really a pity having to do things that are already done.

[André]

Well, seems I had to program each option individually. It was really annoying, maybe Mathworks could provide a way to use the built-in context menus as ordinary menus valid for editing:

%%
function C_zoomOut(hObject, eventdata)
    
zoom(AXES, 0.5)    

end

%%
function C_resetView(hObject, eventdata)
    
zoom(AXES, 'out');

end

%%
function C_unConstrainedZoom(hObject, eventdata)
    
set(hObject.Parent.Children, 'Checked', 'off');
hObject.Checked = 'on';
z = zoom(AXES);
z.Motion = 'both';

end

%%
function C_horizontalZoom(hObject, eventdata)
    
set(hObject.Parent.Children, 'Checked', 'off');
hObject.Checked = 'on';
z = zoom(AXES);
z.Motion = 'horizontal';

end

%%
function C_verticalZoom(hObject, eventdata)
    
set(hObject.Parent.Children, 'Checked', 'off');
hObject.Checked = 'on';
z = zoom(AXES);
z.Motion = 'vertical';

end

%%
function C_exitZoomMode(hObject, eventdata)
    
zoom(AXES, 'off');

end

[Luc]

I had a similar problem in the app designer and noticed that adding these lines did the trick for me:

app.UIAxesZoom=zoom(app.UIAxes);
setAllowAxesZoom(app.UIAxesZoom,app.UIAxes,1);