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List:       gtk-app-devel
Subject:    Re: drag'n'drop with gtk-win32
From:       Tor Lillqvist <tml () iki ! fi>
Date:       2010-04-30 12:56:57
Message-ID: p2hc9b6d9a51004300556o475fd38fj4ee80afea78eb99b () mail ! gmail ! com
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> Can you clarify that for me, Tor?   How is Windows Explorer different from any other external application?

Well, Explorer is obviously a part of Windows, it is not a 3rd-party
application. So it has better access to the internal plumbings of
Windows than normal apps.

But more importantly, the API used to accept files dragged from
Explorer (DragAcceptFiles(), WM_DROPFILES, DragQueryFile(),
DragFinish()) is, as can be seen from the names, specific to files.
(That API is quite old, since NT 3.1 / Windows 95 days.) More generic
drag-and-drop is based on OLE technology, and requires more complex
code in the toolkit / application.

(There is code for the generic drag-and-drop in GTK+, too (see
gdk/win32/gdkdnd-win32.c in recent GTK+), but it is known to be
unfinished and broken, so it isn't used currently.)

--tml
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