Qt Toolkit - group index

# Miscellaneous Classes

Useful classes not fitting into any other category.

Classes:

- QDoubleValidator (Range checking of floating-point numbers)
- QIconSet (Set of icons (normal, disabled, various sizes) for e.g. buttons)
- QIntValidator (Range checking of integers)
- QMenuData (Base class for QMenuBar and QPopupMenu)
- QRangeControl (Integer value within a range)
- QRegExp (Pattern matching using regular expressions and wildcards)
- QValidator (Validation of input text)
- QWidgetStack (Stack of widgets, where the user can see only the top widget)