MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung PDF herunterladen (Seite 185)

Callback Syntax and Arguments

8-13

• References in the M-file to the field of the handles structure that contains

the component’s handle. See “The Handles Structure” on page 8-13 for more

information about the

handles structure.

Changing the Callback Property

To rename a particular callback subfunction without changing the Tag

property,

• Replace the name string in the callback property with the new name. For

example, if the value of the callback property for a push button in

mygui is

mygui('pushbutton1_Callback',gcbo,[],guidata(gcbo))

the string pushbutton1_Callback is the name of the callback function.

Change the name to the desired name, for example,

closebutton_Callback.

• You must update all instances of the callback function name in the M-file.

• You must update references in the M-file to the field of the

handles structure

that contains the component's handle. See “The Handles Structure” on

page 8-13 for more information about the

handles structure.

Input Arguments

All callbacks in the GUI M-file have the following input arguments:

•

hObject — Handle of the object, e.g., the component, for which the callback

was triggered.

•

eventdata — Reserved for later use.

•

handles — Structure that contains the handles of all the objects in the

figure. It may also contain application-defined data. See “The Handles

Structure” on page 8-13 for information about this structure.

The Handles Structure

GUIDE creates a handles structure that contains the handles of all the objects

in the figure. For a GUI that contains an edit text, a panel, a pop-up menu, and

a push button, the

handles structure originally looks similar to this. GUIDE

uses each component’s

Tag property to name the structure element for its

handle.

1 2 ... 180 181 182 183 184 185 186 187 188 189 190 ... 329 330

Keine Kommentare

MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung Seite 185