Widget can't move after set the windowFlag to Qt::Window

[Gaobo]

hello, I have some question about WebAssembly.
I create a widget, and set windowFlag to Qt::Window. Then show it, why it show at top left of the browser, and i can't move it.
my code is:

Form::Form(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Form)
{
    ui->setupUi(this);

    this->setWindowFlags(Qt::Window);
    this->installEventFilter(this);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);


    auto f = new Form(this);
    f->move(200, 200);
    f->show();
}

[Gaobo]

when i set Qt::Dialog to windowFlat, widget become moveable. why?
then it have another question:
the widget can never be showed

[jsulm]

@Gaobo said in Widget can't move after set the windowFlag to Qt::Window:

Then show it, why it show at top left of the browser, and i can't move it

Because it is not a window - it has a parent (MainWindow), so it is part of main window. If you want to show it as a window then do not set a parent.

[Gaobo]

@jsulm
thanks;

If you want to show it as a window then do not set a parent.

Under windows, it show as a window when i not set parent for form. but under web(browser), it doesn't show. why?

What difference between Qt::window and Qt::widget?

when i set Qt::Dialog to windowFlat, widget become moveable. why?

and i set it to dialog and set parent, form can normally show and move. why?