MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guia do Utilizador descarregar pdf (Página 607)

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Examples: Program GUI C omponents

Check Box

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

callbacks by querying the state of its

Value property, as illustrated in the

following example:

function checkb ox1_ Callback(hObject,eventd ata)

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

% Checkbox is checked-take appropriate action

else

% Checkbox is not checked-t ake appropriate action

end

hObject

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

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

the check box

Value property to the value of the Ma x or Mi n property. For

example,

set(cbh,'Value','Max')

puts the check box with handle cbh in the checked state.

Edit Text

To obtain the string a user types in an edit box, use any of its callbacks to get

the value of the

String property. This e xample uses the Callback callback.

function editte xt1_ Callback(hObject,eventd ata)

user_string = get(hObject,'String');

% Proceed with callback

If the edit text Max and Min properties are set such that Max - Min > 1,the

user can enter m ultiple lines. For example, setting

Max to 2, with the default

value of

0 for Min, enables users to enter multiple lines. If you originally

specify

String as a character string, multiline user input is returned as a 2-D

character array w ith each row containing a line. If you originally specify

String as a cell array, multiline user input is returned as a 2-D cell array of

strings.

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

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