Playing with the widgets in Qt Creator is the best way to get a feel for what's available, but it's worth commenting on a few of the classes you're likely to use the most. We've already talked about menus; next, let's look at buttons, text input, and combo boxes. If you're curious what any of these widgets look like, fire up Qt Designer and make one:

Qt's button classes that implement push-buttons, checkboxes, and radio buttons all inherit from the QAbstractButton class. You can drag out any of the concrete subclasses of QAbstractButton in Qt Creator's Designer or instantiate them programmatically. Through QAbstractButton, all buttons have the following properties:

• checkable: This is a Boolean flag indicating whether the button has a checkbox behavior. By default, the value for this property is false.
• checked...