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The QStylePainter class is a convenience class for drawing QStyle elements inside a widget. More...
Inherits QPainter.
The QStylePainter class is a convenience class for drawing QStyle elements inside a widget.
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);
}
See also QStyle and QStyleOption.
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