MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Spécifications télécharger pdf (Page 32)

1 Getting Started with GUIDE

1-24

Example – Programming the Menu Callbacks

After adding the File menu to the layout (you cannot see the menu bar in the

Layout Editor), edit the application M-file. It will contain empty callback

functions for the

File menu as well as the Print and Close items.

File Menu Callback

By default, when a user clicks on the File menu, MATLAB displays the menu

items. Therefore, the only purpose of the

File menu callback in this example is

to disable the

Print menu item when there is no plot being displayed. You can

accomplish this by checking to see if the axes

Children property is empty (in

which case, there is nothing displayed in the axes).

The menu’s

Enable property controls whether a particular item is active or

inactive. The item is grayed out if

Enable is set to off.

The callback uses

isempty to determine if the axes contains a plot and enables

or disables the menu accordingly.

function varargout = file_menu_Callback(h, eventdata, handles, varargin)

if isempty(get(handles.axes1,'Children'))

set(handles.print_submenu,'Enable','off')

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Spécifications Page 32