QStylePainter Class

Detailed Description

QStylePainter extends QPainter with a set of high-level draw...() functions implemented on top of QStyle's API. The advantage of using QStylePainter is that the parameter lists get considerably shorter. Whereas a QStyle object must be able to draw on any widget using any painter (because the application normally has one QStyle object shared by all widget), a QStylePainter is initialized with a widget, eliminating the need to specify the QWidget, the QPainter, and the QStyle for every function call.

Example using QStyle directly:

 void MyWidget::paintEvent(QPaintEvent * /* event */)
 {
     QPainter painter(this);

     QStyleOptionFocusRect option;
     option.initFrom(this);
     option.backgroundColor = palette().color(QPalette::Background);

     style()->drawPrimitive(QStyle::PE_FrameFocusRect, &option, &painter, this);
 }

Example using QStylePainter:

 void MyWidget::paintEvent(QPaintEvent * /* event */)
 {
     QStylePainter painter(this);

     QStyleOptionFocusRect option;
     option.initFrom(this);
     option.backgroundColor = palette().color(QPalette::Background);

     painter.drawPrimitive(QStyle::PE_FrameFocusRect, option);
 }