MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelská příručka stáhnout pdf (Strana 329)

100

101

Add Code for Components in C allbacks

Updating a Menu Item Check

A check is useful to indicate the current state of some menu items. If you

selected Check mark this item in the Menu Editor, 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.

if strcmp(get(h Obje ct, 'Checked'),'on')

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

else

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

end

hObject

is the handle of the component, for which the callback was triggered.

The

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

two are identical and logical

0 (false) otherwise.

Use of checks when the GUI is first displayed should be consistent with the

display. For example, if your GUI has an axes that is visible when a user first

opens it and the GUI has a Show axes menuitem,besuretosetthemenu

item’s

Checked property on w h en you create it so that a check appears next to

the Show axes menu item initia lly .

Note From the Menu Editor, you can view a menu item’s C allback callback

in your editor by selecting the menu item and clicking the View button.

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