Qt minimizing Dialog minimizes Parent Window

haris123

In my application I have a parent window and over it a child dialog, when I minimize my child dialog parent window also get minimized, how can I avoid it. The child dialog is sub-classed from QDialog

And the child dialog pop-up is executed in this way,

ChildDilago PopUp;
PopUp.setModal(false);
Qt::WindowFlags flags = Qt::Window | Qt::WindowSystemMenuHint
                            | Qt::WindowMinimizeButtonHint
                            | Qt::WindowCloseButtonHint;
PopUp.setWindowFlags(flags);
PopUp.setUI(data);
PopUp.exec();

What can be the issue here?, any help will be appreciated...

Thanks
Haris

Chris Kawa

There are two things here that mix into the issue:

First, as described in the docs, exec() always shows the dialog as modal and ignores anything you set with setModal().

Second, the Qt::Window flag makes the widget a normal window, so when it is shown modally it is treated as main app window and thus minimizing it minimizes whole app.

One thing you can do is remove the call to setModal(false), as it does nothing anyway, and change your flags to contain Qt::Dialog instead of Qt::Window. The dialog will now be (well, obviously) a dialog and not minimize the whole app. The downside is that, since it is modal, the OS will send the main window to the back, as there is no interaction with it possible anyway.

If you want a proper, non-modal dialog that can be minimized independently of your main window you can do it like this:

        ChildDilago * PopUp = new ChildDilago (this); //so that it won't go out of scope and be destroyed, modality is false by default
        PopUp->setAttribute(Qt::WA_DeleteOnClose, true); //so that it will be deleted when closed
        Qt::WindowFlags flags = Qt::Dialog | Qt::WindowSystemMenuHint
                                    | Qt::WindowMinimizeButtonHint
                                    | Qt::WindowCloseButtonHint;
        PopUp->setWindowFlags(flags); //so that it has min/max frame buttons
        PopUp->setUI(data);
        PopUp->show(); // so that it is shown not modally

haris123

Hi Thanks for the detailed answer, now the issue solved