MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Especificações descarregar pdf (Página 98)

3 Laying Out GUIs and Setting Properties

3-48

Determining Which Item Is Selected. The Value property contains the index of the

selected item. For example, if the

String contains the three items, peaks,

membrane, and sinc and the Value property has a value of 2, then the item

selected is

membrane.

When not open, a pop-up menu displays the current choice, which is

determined by the index contained in the

Value property. The first item in the

list has an index of 1.

Pop-up menus are useful when you want to provide users with a number of

mutually exclusive choices, but do not want to take up the amount of space that

a series of radio buttons requires.

Enabling or Disabling Controls

You can control whether a control responds to mouse button clicks by setting

the

Enable property. Controls have three states:

•

on — The control is operational.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Especificações Página 98