QWidget Semi-transparent Background Color

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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