Scale QPixmap has no effect

thinkpad_32167

Hi guys,

I am coding an app for my android tablet. I am trying to set a png image as background to my mainwindow. However, the scaled() fct doesn't resize the QPixmap to the right size.

Here is my code :

QPixmap bkgnd = QPixmap(":/images/0.png");
QPixmap scaledPixmap = bkgnd.scaled(this->width(), this->height(),Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
    
QPalette palette;
QBrush brush = QBrush(scaledPixmap);
palette.setBrush(QPalette::Background, brush);
this->setPalette(palette);

Thank you for your help !

SGaist

Hi and welcome to devnet,

Are you by any chance doing that in the constructor ? If so that's normal. When the constructor is called the widget has no idea about the size it's going to have. You should rather do that in a showEvent reimplementation or maybe resizeEvent.

kshegunov

Could you illustrate the issue with a screenshot, as we can have no idea what the correct size is?

SGaist

Hi and welcome to devnet,

Are you by any chance doing that in the constructor ? If so that's normal. When the constructor is called the widget has no idea about the size it's going to have. You should rather do that in a showEvent reimplementation or maybe resizeEvent.

thinkpad_32167

Wow you are right ! Now it works as expected !

Thank you so much, I've been looking for a solution for like a week !