Can't center QDialog.

[Qingshui Kong]

Could somebody help me?

I defined a customDialog that inherited from QDialog. I want it to be frameless and topmost. But its location is (0, 0) by default. I want it to be centered.

Here is the main code.

customDialog::customDialog(QWidget *parent)
QDialog(parent)
{
ui->setupui(this);
this->setWindowFlags(Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint | Qt::Dialog);
}

mainWindow::showDialog()
{
customDialog dialog(this);
dialog.exec();
}

My environment:
Ubuntu 16.04

Thanks

[Ratzz]

This post is deleted!

[dheerendra]

You need to work with setGeometry(..) function. I don't see anything specific to center it.

[Qingshui Kong]

@dheerendra

Thank you!

If I don't setWindowFlags, the dialog show in the center by default. I don't know the reason, but I think there should something I can do to fix it. But I don't know.

What's more, I test it on Windows system, and it works.

[J.Hilk]

@Qingshui-Kong said in Can't center QDialog.:

What's more, I test it on Windows system, and it works.

Qt::X11BypassWindowManagerHint I doubt this one works on Wndows. And usually the window manager positions the dialog centered.

[Qingshui Kong]

@J.Hilk
Thanks you!
I know it works on Linux.
But here is the snapshot of the document.

So I think they both are the same.

[Qingshui Kong]

@Qingshui-Kong
If you override showEvent, you must call the same function of the base class. Or it will skip the same function of the base class. Then there will be some bugs.