MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 187)

Initialization Callbacks

8-15

Initialization Callbacks

GUIDE automatically includes two callbacks, the opening function and the

output function, in every GUI M-file it creates.

• “Opening Function” on page 8-15

• “Output Function” on page 8-17

For information about programming component callbacks, see “Examples:

Programming GUI Components” on page 8-19.

Opening Function

The opening function is the first callback in every GUI M-file. It is executed just

before the GUI is made visible to the user, but after all the components have

been created, i.e., after the components’

CreateFcn callbacks, if any, have been

run.

You can use the opening function to perform your initialization tasks before the

user has access to the GUI. For example, you can use it to create data or to read

data from an external source. GUI command line arguments are passed to the

opening function.

• “Function Naming and Template” on page 8-15

• “Input Arguments” on page 8-16

• “Initial Template Code” on page 8-16

Function Naming and Template

GUIDE names the opening function by appending _OpeningFcn to the name of

the M-file. This is an example of an opening function template as it might

appear in the

mygui M-file.

% --- Executes just before mygui is made visible.

function mygui_OpeningFcn(hObject, eventdata, handles, varargin)

% This function has no output args, see OutputFcn.

% hObject handle to figure

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% varargin command line arguments to mygui (see VARARGIN)

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál Strana 187