MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur télécharger pdf (Page 621)

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Examples: Program GUI C omponents

When a user selects Edit > Copy > to file,noCopy callback is needed to

perform the action. Only the

Callback callback as sociated with the to file

item is required.

Suppose, however, that only certain objects can be copied to a file. You can

use the Copy item

Callback callback to enable or disable the to file item,

depending on the type of object selected.

The follow i ng code disables the to file item by setting its

Enable property

off. The menu item would then appear dimmed.

set(tofilehandle,'Enable','off')

Setting Enab le to on, would then enable the menu item.

Mouse Gestures and Menu Callback Behavior. Callback s for leaf me n u

items, such as for to file or to clipboard in the previous example, actuate

when you release the mouse over them. Callbacks for main menus (like Edit)

and non-leaf submenus (like Copy) actuate when you select them by sliding

the mouse pointer into them after they display. Even w hen it has no menu

items, a main menu callback actuates as soon as you select the menu. When a

submenu contains no items, its callback actuates upon releasing the mouse

over it. However, if a uimenu has one or more child uimenus, its callback

actuates as soon as you select it. The mouse button does not have to be d ow n

to trigger the callback of a m enu item that has children.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur Page 621

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