How to make Window.show_dialog block the execution of the main window and application?

[evbernardes]

I have several elements with callbacks that I add to a dialog:

em = window.theme.font_size
dlg = gui.Dialog(f"Parameter selection")
dlg_layout = gui.Vert(em, gui.Margins(em, em, em, em))
self._finished_updating = False

dlg_layout.add_child(gui.Label("Enter parameters:"))

for element in gui_elements:
    dlg_layout.add_child(element)
    dlg_layout.add_fixed(separation_height)

def _on_accept():
    window.close_dialog()
    self._finished_updating = True

accept = gui.Button("Accept")
accept.set_on_clicked(_on_accept)
h = gui.Horiz()
h.add_stretch()
h.add_child(accept)
h.add_stretch()
dlg_layout.add_child(h)
dlg.add_child(dlg_layout)

I then want to call window.show_dialog(dlg) so it waits until I get all the parameters from the user before doing something.

Currently, show_dialog does not block the rest of the application, which I think is by design. However, in my case this is necessary, otherwise the function would run before getting the parameters.

I tried solving this problem with this:

window.show_dialog(dlg)

while not self._finished_updating:
    print("waiting...")
    app.run_one_tick()

But the result is that now everything is blocked and I don't even see the dialog.

What is the correct way of doing this?