MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guia do Utilizador descarregar pdf (Página 301)

100

101

Add Code for Components in C allbacks

selects the radio button with Tag property radiobutton1 and deselects the

previously selected radio button.

Note You can use a button group to m anage exclusive selection behavior for

radio buttons. See “Button Group” on page 8-42 for more information.

Check Box

You can determine the current state of a check box from within its callback by

querying the state of its

Value property. The Value property is equal to the

Max property when the check box is checked and equal to the Min property

when the check box is not checked. This example illustrates such a test.

function checkb ox1_ Callback(hObject, e vent data, handles)

if (get(hObj ect, 'Value') == get(hOb ject,'Max'))

% Checkbox is checked-take appropriate action

else

% Checkbox is not checked-take appropriate action

end

You can also change the state of a check box programmatically by setting

the check box

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

example i llustrates a possible syntax for such an assignment.

maxVal = get(handles.checkbox1,'Ma x');

set(handles.checkbox1,'Value',maxVa l);

puts the check box with Tag property checkbox1 in the checked state.

Edit Text

To obtain the string a user types in an edit box, g et the String property in

the

Callback callback.

function editte xt1_ Callback(hObject, e vent data, handles)

user_string = get(hObject,'String');

% Proceed with callback

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