QWidget Semi-transparent Background Color

From Qt Wiki
Revision as of 16:24, 3 March 2015 by AutoSpider (talk | contribs) (Add "cleanup" tag)
Jump to navigation Jump to search
This article may require cleanup to meet the Qt Wiki's quality standards. Reason: Auto-imported from ExpressionEngine.
Please improve this article if you can. Remove the {{cleanup}} tag and add this page to Updated pages list after it's clean.

English Български

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