QWidget Semi-transparent Background Color: Difference between revisions
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Revision as of 16:24, 3 March 2015
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QWidget Semi-transparent Background Color
This code snippet shows how to make the background color of "QWidget":http://doc.qt.io/qt-5.0/qtwidgets/qwidget.html semi-transparent by overloading "paintEvent()":http://doc.qt.io/qt-5.0/qtwidgets/qwidget.html#paintEvent.
- Declare overload of paintEvent
.h file
protected:
//overload from QWidget
void paintEvent(QPaintEvent* event);
- Implement the overload of paintEvent
.cpp file
void MyWidget::paintEvent(QPaintEvent* /*event*/)
{
QColor backgroundColor = palette().light().color();
backgroundColor.setAlpha(200);
QPainter customPainter(this);
customPainter.fillRect(rect(),backgroundColor);
}
The code snippet is inspired by solution proposed by Antonio Di Monaco at "this forum thread":http://developer.qt.nokia.com/forums/viewthread/1488.
See Also
"How to Change the Background Color of QWidget":http://wiki.qt.io/How_to_Change_the_Background_Color_of_QWidget