/src/wrappers/gtk/library/format_value_callback.e

 1indexing
 2	description: "Generic callback for the format-value 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 FORMAT_VALUE_CALLBACK
26
27inherit CALLBACK redefine object end
28
29insert
30	G_OBJECT_FACTORY[GTK_SCALE]
31	GLIB_STRING_UTILITY_FUNCTIONS
32
33creation make
34
35feature
36	object: GTK_SCALE
37
38feature
39	callback (value: REAL; instance: POINTER): POINTER is
40		require
41			instance_not_null: instance.is_not_null
42		do
43			debug
44				print ("Callback: instance=") print (instance.to_string) print ("%N")
45				print ("is_object: "+g_is_object (instance).out+"%N")
46				print ("type: "+g_object_type (instance).out+"%N")
47			end
48			object := wrapper(instance)
49			Result := g_strdup (function.item ([value, object]).to_external)
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: GTK_SCALE; a_function: FUNCTION[ANY, TUPLE [REAL, GTK_SCALE], STRING]) is
60		do
61			debug
62				print ("FORMAT_VALUE_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 "format-value"
78
79	function: FUNCTION[ANY, TUPLE [REAL, GTK_SCALE], STRING]
80
81end