MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur télécharger pdf (Page 622)

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101

12 Code a Programmatic GUI

Open a Dialog Box from a Menu Callback

The Callback callback for the to file menu item could contain code such as

the following to display the standard dialog box for saving files.

[file,path] = uiputfile('animinit. m','Save file name' );

'Save file name'

is the d ialog box title. In the dialog box, the filename field

is set to

animinit.m, and the filter set to MATLAB language files (*.m). For

more information, see the

uiputfile reference page.

Note MATLAB software provides a selection of standard dialog boxes

that you can create with a single function call. For an example, see the

documentation for

msgbox, which also provides links to functions that create

specia lized predefine d di alog boxes.

Update a Menu Item Check

A check is useful to indicate the current state of some m enu items. If you set

the

Checked property to on wh en you create the menu item, the item initially

appears checked. Each time the user selects the menu item, the callback for

that item must turn the check on or off. The following example show s you how

to do this by changing the value of the menu item’s

Checked property.

function menu_c opyf ile(hObject,eventdata)

if strcmp(ge t(hO bject,'Checked'),'on')

set(hObject,'Checked','off');

else

set(hObject,'Checked','on');

end

hObject

is the handle of the component for which the event was triggered. Its

use here assumes the menu item’s

Callback property specifies the callback as

a function handle. See “Specify Callbacks in Function Calls” on page 12-11

for more information.

The

strcmp function compares two strings and returns logical 1 (true)ifthe

two are identical, and logical

0 (false) o the rwise.

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