MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur télécharger pdf (Page 613)

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Examples: Program GUI C omponents

slider_value = get(hObject,'Value');

% Proceed with callback...

The Max an d Min properties specify the slider’s maximum and minimum

values. The slider’s range is

Max - Min. hObject is the handle of the

component for which the event was triggered.

Toggle Button

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

what state it is in. MATLAB software sets the

Value property equal to the

Max property when the toggle button is pressed (Max is 1 by default). It sets

the

Value property equal to the Min property when the toggle button is not

pressed (

Min is 0 by default).

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

function toggle butt on1_Callback(hObject,ev entdata)

button_state = get(hObject,'Value');

if button_st ate == get(hObject,'Max')

% Toggle button is pressed-tak e appropriate action

...

elseif butto n_st ate == get(hObject, 'Min ')

% Toggle button is not pressed-take appropria te action

...

end

hObject

is the handle of the component for which the event was triggered.

You can also change the state of a toggle button programmatically by setting

thetogglebutton

Value property to the value of the Max or Min property.

For example,

set(tbh,'Value','Max')

puts the toggle b utton with handle tbh in the pressed state.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur Page 613

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