/src/wrappers/gtk/library/drag_motion_callback.e

 1indexing
 2	description: "Generic callback for the drag-motion 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_MOTION_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		local drag_context: GDK_DRAG_CONTEXT
39		do
40			debug print ("Callback: instance=") print (instance.to_string) print ("%N") end
41			check 
42				instance.is_not_null
43				drag_context_ptr.is_not_null	
44			end
45			object := wrapper(instance)
46			create drag_context.secondary_wrapper_from (drag_context_ptr)
47			
48			Result := function.item ([drag_context, x, y, time, object]).to_integer
49		end
50
51	callback_pointer: POINTER is
52		do
53			Result := get_callback_pointer ($callback)
54		ensure
55			Result.is_not_null
56		end
57
58	connect (an_object: GTK_WIDGET; a_function: FUNCTION [ANY, TUPLE [GDK_DRAG_CONTEXT, INTEGER, INTEGER,
59																							INTEGER, GTK_WIDGET], BOOLEAN]) is
60		do
61			debug
62				print ("DRAG_MOTION_CALLBACK.connect (an_object=") print (an_object.to_pointer.to_string)
63				print (" an_object.handle=") print (an_object.handle.to_string)
64				print (") Current=") print (to_pointer.to_string)
65				print (" Current.handle=") print (handle.to_string)
66				print ("%N")
67			end
68			
69			handler_id := g_signal_connect_closure (an_object.handle,
70																 signal_name.to_external,
71																 handle,
72																 0 -- i.e. call it before default handler
73																)
74			function:=a_function
75		end
76
77		signal_name: STRING is "drag-motion"
78
79	function: FUNCTION [ANY, TUPLE [GDK_DRAG_CONTEXT, INTEGER, INTEGER, INTEGER, GTK_WIDGET], BOOLEAN]
80
81end