QFileDialog with strange behavior

[Quorn Julio]

Hello,

first of all i develop under mac 10.14.6 (Mojave) using Qt 5.15.0.
in my program i use QFileDialog as follow:

this->fileDialog = new QFileDialog(window());
this->fileDialog->setWindowFlags(Qt::Sheet);
this->fileDialog->setWindowModality(Qt::WindowModal);
this->fileDialog->setModal(true);
...
this->fileDialog->exec()

The strange thing is here that the dialog opens on the right position but than jumps down with a certain offset Y.

I try to "fix" the position of QFileDialog with setGeometry(0, 0, 500, 400) but this without success.

I am grateful for any help.

[Pl45m4]

@Quorn-Julio said in QFileDialog with strange behavior:

this->fileDialog = new QFileDialog(window());

This looks weird... Replace window() with this or some other valid parent and try if your dialog "jumps" again

@Quorn-Julio said in QFileDialog with strange behavior:

this->fileDialog->setWindowModality(Qt::WindowModal);
this->fileDialog->setModal(true);

This is redundant... first line sets fileDialog window to WindowModal, the second overrides this setting with ApplicationModal, which is pretty much the same in a parent-child-hierarchy

EDIT:

And there is also this:

Qt::Sheet

Indicates that the window is a sheet on macOS. Since using a sheet implies window modality, the recommended way is to use QWidget::setWindowModality(), or QDialog::open(), instead.
(From: https://doc.qt.io/qt-5/qt.html#WindowType-enum)

So I guess, using Qt::Sheet together with setModal(true) is not recommended on MacOS.
If this causes your jump?! I don't know :)

[Quorn Julio]

@Pl45m4

Thank you so much!

QDialog::open()

works properly / as expected. i wonder why QDialog::exec does not!
I would have expected the same behavior.