/src/wrappers/gtk/library/toggled_callback.e

 1indexing
 2	description: "Generic callback for the toggled 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 TOGGLED_CALLBACK [W -> G_OBJECT]
26
27inherit
28	CALLBACK redefine object end
29
30insert
31	G_OBJECT_FACTORY [W]
32
33creation make
34
35feature
36	object: W
37
38feature
39	callback (instance: POINTER) is
40		do
41			debug
42				print ("Callback: instance=") print (instance.to_string) print ("%N")
43			end
44			-- The following is written with the implicit requirement 
45			-- that the button is actually created bu the Eiffel 
46			-- application. 
47			object := wrapper(instance)
48			-- The above line replaces "create object.from_external_pointer
49			-- (instance)" which continuosly creates new Eiffel wrappers
50			procedure.call ([object])
51		end
52
53	callback_pointer: POINTER is
54		do
55			Result := get_callback_pointer ($callback)
56		ensure
57			Result.is_not_null
58		end
59
60	connect (an_object: W; a_procedure: PROCEDURE [ANY, TUPLE[W]]) is
61		do
62			debug
63				print ("TOGGLED_CALLBACK.connect (an_object=") print (an_object.to_pointer.to_string)
64				print (" an_object.handle=") print (an_object.handle.to_string)
65				print (") Current=") print (to_pointer.to_string)
66				print (" Current.handle=") print (handle.to_string)
67				print ("%N")
68			end
69					 
70			handler_id := g_signal_connect_closure (an_object.handle,
71													 signal_name.to_external,
72													 handle,
73													 0 -- i.e. call it before default handler
74													 )
75			procedure:=a_procedure
76		end
77
78		signal_name: STRING is "toggled"
79
80	procedure: PROCEDURE [ANY, TUPLE[W]]
81end