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101

Creating Graphical User Interfaces (GUIs)

9-21

Creating Graphical User Interfaces (GUIs)

Do not Repopulate Menus on the Mac from Inside Their Callbacks

In R2011a, figures display their menus on the Mac screen menubar instead of across

the top of figure windows. Prior to R2011a, GUIs could create dynamic menus using

callbacks that completely deleted, and then repopulated the contents of menus. But on

a Mac, running a GUI with a menu whose callback changes all items in this manner

can result in the display of a blank menu (no items). The unexpected behavior only

happens when a uimenu callback deletes all submenus (child uimenu components) and

repopulates the menu with a new set of items at the time the menu opens.

In R2011a, on the Mac platform only, uimenu callbacks are no longer able to replace all

submenus during menu selection. Note that repopulating some (not all) menu items does

not create this issue. However, it is not good programming practice to remove and insert

menu items within a menu callback routine.

For more information, see “MATLAB Menus Display at the Top of the Apple Mac Screen”

on page 9-2.

Compatibility Considerations

If you have a uimenu callback that repopulates all of its menu items when you open that

menu, you must change that code if you want it to work on a Mac. For example, your code

might be able to remove and install submenus from outside of the callback that handles

the menu. The callback can also rename, disable, hide, and show submenus instead of

deleting them and creating new ones. The Mac is the only platform impacted by this

incompatibility. Menus on Microsoft Windows, Unix, and Linux continue to behave as

they did in previous releases.

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