MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung PDF herunterladen (Seite 318)

12 Examples of GUIs Created Programmatically

12-40

Passing Input Arguments to a GUI

Inputs to the GUI are custom property/value pairs. iconEdit allows three such

properties:

IconWidth, IconHeight, and IconFile. The names are

caseinsensitive.

Definition and Initialization of the Properties. The iconEdit first defines a variable

mInputArgs as varargin to accept the user input arguments.

mInputArgs = varargin; % Command line arguments when invoking

% the GUI

The iconEdit function then defines the valid custom properties in a 3-by-3 cell

array.

mPropertyDefs = {... % Supported custom property/value

% pairs of this GUI

'iconwidth', @localValidateInput, 'mIconWidth';

'iconheight', @localValidateInput, 'mIconHeight';

'iconfile', @localValidateInput, 'mIconFile'};

• The first column contains the property name.

• The second column contains a function handle for the function,

localValidateInput, that validates the input property values.

• The third column is the local variable that holds the value of the property.

iconEdit then initializes the properties with default values.

mIconWidth = 16; % Use input property 'iconwidth' to initialize

mIconHeight = 16; % Use input property 'iconheight' to initialize

mIconFile = fullfile(matlabroot,'/toolbox/matlab/icons/');

The values of mIconWidth and mIconHeight are interpreted as pixels. The

fullfile function builds a full filename from parts.

Processing the Input Arguments. The processUserInputs helper function processes

the input property/value pairs.

iconEdit calls processUserInputs after the

layout is complete and just before it needs the inputs to initialize the GUI.

% Process the command line input arguments supplied when

% the GUI is invoked

processUserInputs();

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung Seite 318