QWidget Semi-transparent Background Color: Difference between revisions
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[[Category:snippets]] | [[Category:snippets]] | ||
[[Category:HowTo]] | [[Category:HowTo]] | ||
This code snippet shows how to make the background color of [http://doc.qt.io/qt-5.0/qtwidgets/qwidget.html QWidget] semi-transparent by overloading [http://doc.qt.io/qt-5.0/qtwidgets/qwidget.html#paintEvent paintEvent()]. | This code snippet shows how to make the background color of [http://doc.qt.io/qt-5.0/qtwidgets/qwidget.html QWidget] semi-transparent by overloading [http://doc.qt.io/qt-5.0/qtwidgets/qwidget.html#paintEvent paintEvent()]. | ||
Declare overload of paintEvent in .h file... | |||
<code> | <code> | ||
protected: | protected: | ||
//overload from QWidget | |||
//overload from QWidget | void paintEvent(QPaintEvent* event); | ||
</code> | </code> | ||
Implement the overload of paintEvent in.cpp file... | |||
<code> | <code> | ||
void MyWidget::paintEvent(QPaintEvent* /*event*/) | void MyWidget::paintEvent(QPaintEvent* /*event*/) { | ||
{ | |||
QColor backgroundColor = palette().light().color(); | QColor backgroundColor = palette().light().color(); | ||
backgroundColor.setAlpha(200); | backgroundColor.setAlpha(200); | ||
| Line 32: | Line 21: | ||
} | } | ||
</code> | </code> | ||
== See Also == | == See Also == | ||
[http://wiki.qt.io/How_to_Change_the_Background_Color_of_QWidget How to Change the Background Color of QWidget] | [http://wiki.qt.io/How_to_Change_the_Background_Color_of_QWidget How to Change the Background Color of QWidget] | ||
Latest revision as of 13:52, 24 March 2016
This code snippet shows how to make the background color of QWidget semi-transparent by overloading paintEvent().
Declare overload of paintEvent in .h file...
protected:
//overload from QWidget
void paintEvent(QPaintEvent* event);
Implement the overload of paintEvent in.cpp file...
void MyWidget::paintEvent(QPaintEvent* /*event*/) {
QColor backgroundColor = palette().light().color();
backgroundColor.setAlpha(200);
QPainter customPainter(this);
customPainter.fillRect(rect(),backgroundColor);
}