[SOLVED]QVariant will drop alpha value when save QColor?
-
It seems that QVariant only save QColor as #RRGGBB, and all other info will no longer exists, including alpha value of QColor.
So, any better way to work around this?
-
If you save the color in a text file, you could test for the QColor type and make the string yourself
Assuming you are using a QTextStream;@
if (variant.type() == QVariant::Color) {
QColor color = variant.value<QColor>();
QString colorText = QString("#%1%2%3%4").arg(color.red())
.arg(color.green())
.arg(color.blue())
.arg(color.alpha());
stream << colorText;
}
@And then parse the string in using a similar logic when you read the file
-
Thanks~
-
If you only want to save RGBA values in a QVariant, you can save and restore like this with less overhead :
@
//Store
QColor color;
QVariant v(color.rgba());//Retrieve
QColor color = QColor::fromRgba(v.toUInt());
@note though that the QColor is stored as a 32bit unsigned integer.
-
Indeed, saving as integer is more efficient. I've changed my code to this^^
