A GtkWindow can be one of these types. Most things you'd consider a
"window" should have type GTK_WINDOW_TOPLEVEL; windows with this type
are managed by the window manager and have a frame by default (call
gtk_window_set_decorated() to toggle the frame). Windows with type
GTK_WINDOW_POPUP are ignored by the window manager; window manager
keybindings won't work on them, the window manager won't decorate the
window with a frame, many GTK+ features that rely on the window
manager will not work (e.g. resize grips and
maximization/minimization). GTK_WINDOW_POPUP is used to implement
widgets such as GtkMenu or tooltips that you normally don't think of
as windows per se. Nearly all windows should be GTK_WINDOW_TOPLEVEL.
In particular, do not use GTK_WINDOW_POPUP just to turn off
the window borders; use gtk_window_set_decorated() for that.
GTK_WINDOW_TOPLEVEL
A regular window, such as a dialog.
GTK_WINDOW_POPUP
A special window such as a tooltip.
A GtkWindow can be one of these types. Most things you'd consider a "window" should have type GTK_WINDOW_TOPLEVEL; windows with this type are managed by the window manager and have a frame by default (call gtk_window_set_decorated() to toggle the frame). Windows with type GTK_WINDOW_POPUP are ignored by the window manager; window manager keybindings won't work on them, the window manager won't decorate the window with a frame, many GTK+ features that rely on the window manager will not work (e.g. resize grips and maximization/minimization). GTK_WINDOW_POPUP is used to implement widgets such as GtkMenu or tooltips that you normally don't think of as windows per se. Nearly all windows should be GTK_WINDOW_TOPLEVEL. In particular, do not use GTK_WINDOW_POPUP just to turn off the window borders; use gtk_window_set_decorated() for that. GTK_WINDOW_TOPLEVEL A regular window, such as a dialog. GTK_WINDOW_POPUP A special window such as a tooltip.