C++/Qt/QPalette
Set Palette before paint
<source lang="cpp"> /****************************************************************************
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- include <QtGui>
class MyWidget : public QWidget { public:
MyWidget();
protected:
void paintEvent(QPaintEvent *);
}; MyWidget::MyWidget() {
QPalette palette(MyWidget::palette()); palette.setColor(backgroundRole(), Qt::white); setPalette(palette);
} void MyWidget::paintEvent(QPaintEvent *) {
QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.setPen(Qt::darkGreen); painter.drawRect(1, 2, 6, 4); painter.setPen(Qt::darkGray); painter.drawLine(2, 8, 6, 2);
} int main(int argc, char *argv[]) {
QApplication app(argc, argv); MyWidget widget; widget.show(); return app.exec();
}
</source>