QFileDialog is not scaled the same way as the QApplicaiton with high DPI monitor

[johnyang]

I am developing an application to work with 4k monitor. I manged to get nicely scaled application with Qt5.14.2 with following code:

QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling); 
QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps); 
QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::Ceil);

However when I open a file dialog using QFileDialog::getOpenFileNames, the pop-up dialog looks a lot smaller. I even tried the following code to make sure it has the same font size as the whole application, but the resultant pop up still looks the same same:

QFileDialog openFileDialog;
QFont font = QApplication::font();
font.setPointSize(8);
openFileDialog.setFont(font);

Any idea why this is happening and how to fix it?

[jsulm]

@johnyang said in QFileDialog is not scaled the same way as the QApplicaiton with high DPI monitor:

getOpenFileNames

This is a static method, changing font on a QFileDialog instance will not influence what getOpenFileNames shows.

[johnyang]

@jsulm any clue how to fix this issue?

[jsulm]

@johnyang You could try to pass QFileDialog::DontUseNativeDialog as options to QFileDialog::getOpenFileNames

[johnyang]

@jsulm Looks like that is the only way to get the scaled widget correctly. Thanks!