[Lazarus] Popup window

[Krzysztof]

What I found that Banshee using GTK: VolumeButton which inherit from
ScaleButton. ScaleButton has getpopup (GTKWidget type). So maybe it is
using gtk window with GTK_WINDOW_POPUP type. I'm not familiar with C
language and low level GTK, but documentation says:

"GtkWidget*  gtk_window_new (GtkWindowType type);

Creates a new GtkWindow, which is a toplevel window that can contain other
widgets. Nearly always, the type of the window should be
GTK_WINDOW_TOPLEVEL. If you're implementing something like a popup menu
from scratch (which is a bad idea, just use GtkMenu), you might use
GTK_WINDOW_POPUP. GTK_WINDOW_POPUP is not for dialogs, though in some other
toolkits dialogs are called "popups". In GTK+, GTK_WINDOW_POPUP means a
pop-up menu or pop-up tooltip. On X11, popup windows are not controlled by
the window manager.

If you simply want an undecorated window (no window borders), use
gtk_window_set_decorated(), don't use GTK_WINDOW_POPUP."

Anyway, TPopupWindow could be interesting feature, like in my case for
volume button, but also for custom popup menus, tips etc. Especially when
similar option exists for QT and windows widgetsets
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