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-- Copyright (C) 2000 Richie Bielak and others
-- Licensed under Eiffel Forum Freeware License, version 1;
-- (see forum.txt)
--
indexing
description: "GDK_INPUT_FUNCTION - functions that will be called %
%if an I/O event occurs on some file descriptor"
author: "Richie Bielak"
version: "v 0.3.5 GTK+ 1.2.x"
class GDK_INPUT_FUNCTION
inherit
MEMORY
redefine
dispose
end
EGTK_NON_PORTABLE
feature
source_fd: INTEGER
-- file descriptor watched for input
set_source_fd (fd: INTEGER) is
-- set the file descriptor to watch
require
fd_valid: fd >= 0
do
source_fd := fd
end
input_add (input_condition: INTEGER; destroy_callback: BOOLEAN) is
-- define input function
require
valid_fd: source_fd >= 0
do
if not destroy_callback then
input_function_id := gdk_npc.c_gdk_input_add (source_fd,
input_condition,
Current,
$execute,
$call_block_pointer)
else
input_function_id := gdk_npc.c_gdk_input_add_full (source_fd,
input_condition,
Current,
$execute,
$notify_of_fd_destruction,
$call_block_pointer)
end
ensure
defined: input_function_id >= 0
end
input_function_id: INTEGER
-- id assigned by GDK to this input function
remove_input is
require
input_function_id_valid: input_function_id /= 0
do
gdk_input_remove (input_function_id)
input_function_id := 0
end
feature
execute (input_condition: INTEGER) is
-- called when file descriptor is ready for I/O
-- redefine in descendant
do
end
notify_of_fd_destruction is
-- redefine in descendant as needed
do
end
feature {NONE}
gdk_input_remove (id: INTEGER) is
external "C"
end
feature {NONE} -- ISE implementation
call_block_pointer: POINTER
-- callback block for input function
destroy_call_block_pointer: POINTER
-- callback block for notify destroy function
dispose is
do
if call_block_pointer /= default_pointer then
c_free_call_back_block (call_block_pointer)
end
if destroy_call_block_pointer /= default_pointer then
c_free_call_back_block (destroy_call_block_pointer)
end
end
c_free_call_back_block (p: POINTER) is
-- called from dispose
external "C"
end
end
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