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/src/wrappers/gtk/library/focus_event_callback.e

http://github.com/tybor/Liberty
Specman e | 68 lines | 53 code | 13 blank | 2 comment | 3 complexity | 9f3d3fa2b1adc530973e4df8061c6570 MD5 | raw file
 1indexing
 2	description: "Generic callback for the focus-in-event and focus-out-event signals."
 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
25deferred class FOCUS_EVENT_CALLBACK
26	-- You want to use one of FOCUS_EVENT_RELEASE_CALLBACK or FOCUS_EVENT_PRESS_CALLBACK
27
28inherit CALLBACK redefine object end
29
30insert G_OBJECT_FACTORY [GTK_WIDGET]
31
32feature
33	object: GTK_WIDGET
34
35feature
36
37	callback (event_ptr: POINTER; instance: POINTER): INTEGER is
38		local
39			focus_event: GDK_EVENT_FOCUS
40		do
41			debug print ("Callback: instance=") print (instance.to_string) print ("%N") end
42			object := wrapper(instance)
43			create focus_event.from_external_pointer(event_ptr)
44			Result := function.item ([focus_event, object]).to_integer
45			-- GTK is about to release this event, detach it from Eiffel
46			focus_event.dispose
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_EVENT_FOCUS, GTK_WIDGET], BOOLEAN]) is
57		do
58			handler_id := g_signal_connect_closure (an_object.handle,
59																 signal_name.to_external,
60																 handle,
61																 0 -- i.e. call it before default handler
62																)
63			function := a_function
64		end
65
66	function: FUNCTION [ANY, TUPLE [GDK_EVENT_FOCUS, GTK_WIDGET], BOOLEAN]
67
68end -- class FOCUS_EVENT_CALLBACK