MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur télécharger pdf (Page 279)

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101

Default Callback Properties in GUIDE

In this section...

“Setting Callback Properties Automatically” on page 8-11

“Deleting Callbacks from a GUI Code File” o n page 8-14

Setting Callback Properties Automatically

A GUI can have many components. GUIDE provides a way of specifying which

callback runs in response to a particular event for a particular component.

The callback that runs when the GUI user clicks a Yes button is not the one

that runs for the No button. Similarly, each menu item usually performs a

different function. See “Kinds of Callbacks” on page 8-2 for a list of callback

properties and the components to which each applies.

GUIDE i nitially sets the value of the most commonly used callback properties

for each component to

%automatic. For example, a push button has five

callback properties,

ButtonDownFcn, Callback, Create Fcn , DeleteFcn,and

KeyPressFcn. GUIDE sets only the Callback property, the most commonly

used callback, to

%automatic. You can use the Property Inspector to set the

other callback properties to

%automatic. To do so, click th e pencil-and-paper

icon

next to the callback name. GUIDE immediately replaces % automatic

with a M ATLAB expre ssio n that is the GUI calling sequence for the callback.

Within the calling sequence, it constructs the callback name, for example,

the subfunction name, from the component

Tag property and the name of

the callback property.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur Page 279

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