MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 178)

8 Programming the GUI

8-6

GUI M-File Structure

The GUI M-file that GUIDE generates is a function file. The name of the main

function is the same as the name of the M-file. For example, if the name of the

M-file is

mygui.m, then the name of the main function is mygui. Each callback

in the file is a subfunction of the main function.

When GUIDE generates an M-file, it automatically includes templates for the

most commonly used callbacks for each component. The M-file also contains

initialization code, as well as an opening function callback and an output

function callback. You must add code to the component callbacks for your GUI

to work as you want. You may also want to add code to the opening function

callback and the output function callback. The major sections of the GUI M-file

are ordered as shown in the following table.

Section Description

Comments Displayed at the command line in response to the

help command. Edit these as necessary for your

GUI.

Initialization GUIDE initialization tasks. Do not edit this code.

Opening function Performs your initialization tasks before the user

has access to the GUI.

Output function Returns outputs to the MATLAB command line

after the opening function returns control and

before control returns to the command line.

Component and

figure callbacks

Control the behavior of the GUI figure and of

individual components. MATLAB calls a callback

in response to a particular event for a component

or for the figure itself.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál Strana 178