/src/wrappers/gtk/library/drag_begin_callback.e

 1indexing
 2	description: "Generic callback for the drag-begin signal"
 3	copyright: "[
 4					Copyright (C) 2006 Paolo redaelli, eiffel-libraries team,  GTK+ team and others
 5					
 6					This library is free software; you can redistribute it and/or
 7					modify it under the terms of the GNU Lesser General Public License
 8					as published by the Free Software Foundation; either version 2.1 of
 9					the License, or (at your option) any later version.
10					
11					This library is distributed in the hope that it will be useful, but
12					WITHOUT ANY WARRANTY; without even the implied warranty of
13					MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14					Lesser General Public License for more details.
15
16					You should have received a copy of the GNU Lesser General Public
17					License along with this library; if not, write to the Free Software
18					Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19					02110-1301 USA
20				]"
21	license: "LGPL v2 or later"
22	date: "$Date:$"
23	revision "$Revision:$"
24
25class DRAG_BEGIN_CALLBACK
26
27inherit CALLBACK redefine object end
28
29insert G_OBJECT_FACTORY [GTK_WIDGET]
30
31creation make
32
33feature
34	object: GTK_WIDGET
35
36feature
37	callback (drag_context_ptr, instance: POINTER) is
38		local
39			factory: G_OBJECT_FACTORY [GDK_DRAG_CONTEXT]
40			drag_context: GDK_DRAG_CONTEXT
41		do
42			debug print ("Callback: instance=") print (instance.to_string) print ("%N") end
43			object := wrapper(instance)
44			create drag_context.secondary_wrapper_from (drag_context_ptr)
45			procedure.call ([drag_context, object])
46		end
47
48	callback_pointer: POINTER is
49		do
50			Result := get_callback_pointer ($callback)
51		ensure
52			Result.is_not_null
53		end
54
55	connect (an_object: GTK_WIDGET; a_procedure: PROCEDURE [ANY, TUPLE[GDK_DRAG_CONTEXT, GTK_WIDGET]]) is
56		do
57			debug
58				print ("DRAG_BEGIN_CALLBACK.connect (an_object=") print (an_object.to_pointer.to_string)
59				print (" an_object.handle=") print (an_object.handle.to_string)
60				print (") Current=") print (to_pointer.to_string)
61				print (" Current.handle=") print (handle.to_string)
62				print ("%N")
63			end
64			
65			handler_id := g_signal_connect_closure (an_object.handle,
66																 signal_name.to_external,
67																 handle,
68																 0 -- i.e. call it before default handler
69																)
70			procedure:=a_procedure
71		end
72
73		signal_name: STRING is "drag-begin"
74
75		procedure: PROCEDURE [ANY, TUPLE[GDK_DRAG_CONTEXT, GTK_WIDGET]]
76end