QStyleOptionTabV3 Class Reference

Detailed Description

The QStyleOptionTabV3 class is used to describe the parameters necessary for drawing a tabs in Qt 4.5 or above.

An instance of the QStyleOptionTabV3 class has type SO_Tab and version 3. The type is used internally by QStyleOption, its subclasses, and qstyleoption_cast() to determine the type of style option. In general you do not need to worry about this unless you want to create your own QStyleOption subclass and your own styles. The version is used by QStyleOption subclasses to implement extensions without breaking compatibility. If you use qstyleoption_cast(), you normally do not need to check it.

If you create your own QStyle subclass, you should handle both QStyleOptionTab, QStyleOptionTabV2 and QStyleOptionTabV3. One way to achieve this is to use the QStyleOptionTabV3 copy constructor. For example:

     if (const QStyleOptionTab *tabOption =
            qstyleoption_cast<const QStyleOptionTab *>(option)) {
         QStyleOptionTabV2 tabV2(*tabOption);

         // draw the tab using tabV2
    }

In the example above: If tabOption's version is 1, the extra member (iconSize) will be set to an invalid size for tabV2. If tabOption's version is 2, the constructor will simply copy the tab's iconSize.

For an example demonstrating how style options can be used, see the Styles example.