MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Especificações descarregar pdf (Página 128)

4 Programming GUIs

4-8

Programming Callbacks for GUI Components

This section explains how to program the callbacks for some specific GUI

components. “Callback Properties” on page 3-51 describes the different kinds

of callbacks.

See a component’s property reference page to determine which callbacks apply

for that component. “Setting Component Properties — The Property Inspector”

on page 3-40 provides links to the property reference pages.

This section provides information on the following topics:

• “Toggle Button Callback” on page 4-8

• “Radio Buttons” on page 4-9

• “Check Boxes” on page 4-10

• “Edit Text” on page 4-10

• “Sliders” on page 4-11

• “List Boxes” on page 4-11

• “Pop-Up Menus” on page 4-12

• “Panels” on page 4-13

• “Button Groups” on page 4-13

• “Axes” on page 4-14

• “ActiveX Controls” on page 4-17

• “Figures” on page 4-24

Toggle Button Callback

The callback for a toggle button needs to query the toggle button to determine

what state it is in. MATLAB sets the

Value property equal to the Max property

when the toggle button is depressed (

Max is 1 by default) and equal to the Min

property when the toggle button is not depressed (

Min is 0 by default).

From the GUI M-file

The following code illustrates how to program the callback in the GUI M-file.

function togglebutton1_Callback(hObject, eventdata, handles)

button_state = get(hObject,'Value');

if button_state == get(hObject,'Max')

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Especificações Página 128