/src/wrappers/gtk/library/drag_data_received_callback.e

 1indexing
 2	description: "Generic callback for the drag-data-received 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_DATA_RECEIVED_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: POINTER; x,y: INTEGER; selection_data_ptr: POINTER;
38				 info, time: INTEGER; instance: POINTER) is
39		require
40			info >= 0
41			time >= 0
42		local
43			factory: G_OBJECT_EXPANDED_FACTORY [GDK_DRAG_CONTEXT]
44			drag_context: GDK_DRAG_CONTEXT
45			selection_data: GTK_SELECTION_DATA
46		do
47			debug
48				print ("Callback: instance=") print (instance.to_string) print ("%N")
49			end
50			-- The following is written with the implicit requirement 
51			-- that object actually has an Eiffel wrapper.
52			object := wrapper(instance)
53			
54			drag_context := factory.existant_wrapper(drag_context_ptr)
55			if drag_context=Void then 
56				create drag_context.from_external_pointer(drag_context_ptr)
57			end
58			create selection_data.from_external_pointer(selection_data_ptr)
59			procedure.call ([drag_context, x, y, selection_data, info, time, object])
60		ensure
61			info >= 0
62			time >= 0
63		end
64
65	callback_pointer: POINTER is
66		do
67			Result := get_callback_pointer ($callback)
68		ensure
69			Result.is_not_null
70		end
71
72	connect (an_object: GTK_WIDGET; a_procedure: PROCEDURE [ANY, TUPLE [GDK_DRAG_CONTEXT, INTEGER, INTEGER,
73																							  GTK_SELECTION_DATA, INTEGER, INTEGER,
74																							  GTK_WIDGET]]) is
75		do
76			debug
77				print ("DRAG_DATA_RECEIVED_CALLBACK.connect (an_object=") print (an_object.to_pointer.to_string)
78				print (" an_object.handle=") print (an_object.handle.to_string)
79				print (") Current=") print (to_pointer.to_string)
80				print (" Current.handle=") print (handle.to_string)
81				print ("%N")
82			end
83			
84			handler_id := g_signal_connect_closure (an_object.handle,
85																 signal_name.to_external,
86																 handle,
87																 0 -- i.e. call it before default handler
88																)
89			procedure:=a_procedure
90		end
91
92		signal_name: STRING is "drag-data-received"
93
94	procedure: PROCEDURE [ANY, TUPLE [GDK_DRAG_CONTEXT, INTEGER, INTEGER,
95												 GTK_SELECTION_DATA, INTEGER, INTEGER, GTK_WIDGET]]
96
97end