/src/wrappers/gtk/library/activate_callback.e

 1indexing
 2	description: "Generic callback for the activate 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 ACTIVATE_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
38	callback (instance: POINTER) is 
39		do
40			debug
41				print ("Callback: instance=") print (instance.to_string) print ("%N")
42			end
43			-- The following is written with the implicit requirement 
44			-- that the button is actually created bu the Eiffel 
45			-- application. 
46			object := wrapper(instance)
47			-- The above line replaces "create object.from_external_pointer
48			-- (instance)" which continuosly creates new Eiffel wrappers
49			procedure.call ([object])
50		end
51
52	callback_pointer: POINTER is
53		do
54			Result := get_callback_pointer ($callback)
55		ensure
56			Result.is_not_null
57		end
58
59	connect (an_object: W; a_procedure: PROCEDURE [ANY, TUPLE[W]]) is
60		do
61			debug
62				print ("ACTIVATE_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			procedure:=a_procedure
75		end
76
77	signal_name: STRING is "activate"
78
79	procedure: PROCEDURE [ANY, TUPLE[W]]
80
81end