/src/wrappers/gtk/library/drag_drop_callback.e

 1indexing
 2	description: "Generic callback for the drag-drop 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_DROP_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, time: INTEGER; instance: POINTER): INTEGER is
38		-- require time >= 0
39		local drag_context: GDK_DRAG_CONTEXT
40		do
41			debug
42				print ("Callback: instance=") print (instance.to_string) print ("%N")
43			end
44			object := wrapper(instance)
45			create drag_context.secondary_wrapper_from(drag_context_ptr)
46			Result := function.item ([drag_context, x, y, time, object]).to_integer
47		end
48
49	callback_pointer: POINTER is
50		do
51			Result := get_callback_pointer ($callback)
52		ensure
53			Result.is_not_null
54		end
55
56	connect (an_object: GTK_WIDGET; a_function: FUNCTION [ANY, TUPLE [GDK_DRAG_CONTEXT, INTEGER, INTEGER,
57																							INTEGER, GTK_WIDGET], BOOLEAN]) is
58		do
59			debug
60				print ("DRAG_DROP_CALLBACK.connect (an_object=") print (an_object.to_pointer.to_string)
61				print (" an_object.handle=") print (an_object.handle.to_string)
62				print (") Current=") print (to_pointer.to_string)
63				print (" Current.handle=") print (handle.to_string)
64				print ("%N")
65			end
66			
67			handler_id := g_signal_connect_closure (an_object.handle,
68																 signal_name.to_external,
69																 handle,
70																 0 -- i.e. call it before default handler
71																)
72			function:=a_function
73		end
74
75		signal_name: STRING is "drag-drop"
76
77	function: FUNCTION [ANY, TUPLE [GDK_DRAG_CONTEXT, INTEGER, INTEGER, INTEGER, GTK_WIDGET], BOOLEAN]
78
79end