Shapes of control are shrinked on 4k displays d

[Pavel_47]

Hello,
When application, developed in QtCreator is launched, shapes of controls (e.g. buttons) are different from those, designed with QtCreator.
Does exist a workaround.
Thanks

[SGaist]

Hi and welcome to devnet,

Your explication is not exactly clear. Can you post screen shots that shows the difference ?

By the way:

• What Qt version are you using ?
• What OS are you running ?

[Pavel_47]

Thanks.
Here it is:

QtCreator: 4.9.0
OS: Windows 10

[SGaist]

Did you already check the HighDPI chapter in Qt's documentation ?

[Pavel_47]

Well, there is attrbute Qt::AA_EnableHighDpiScaling, that apparently resolves the problem.
How (or where) can I set it ?
Thanks.

[SGaist]

If you follow the link to the attribute documentation, you can find QCoreApplication::setAttribute.

[Pavel_47]

Setting the Qt::AA_EnableHighDpiScaling attribute to true in the MainWindow constructor
didn't help: the button shape remains shrinked.

[jsulm]

@Pavel_47 Try to set the attribute before creating the MainWindow instance.

[Pavel_47]

Tried. The same (i.e. button shrinked).
int main(int argc, char *argv[])

{
    QApplication a(argc, argv);
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
    MainWindow w;
    w.show();

    return a.exec();
}

[jsulm]

@Pavel_47 Is the button in a layout? How did you set it up?

[Pavel_47]

Should be like this:

[SGaist]

@Pavel_47 said in Shapes of control are shrinked on 4k displays d:

AA_EnableHighDpiScaling

As explained in the documentation of this enum, it must be set before creating a QGuiApplication instance (which is also valid for QApplication since it's based on QGuiApplication).

[Pavel_47]

Yes ! Works. Thanks

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}