2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
11 local t_insert = table.insert;
12 local t_sort = table.sort;
19 local function _rebuild_index(event) -- TODO optimize index rebuilding
20 local _handlers = event_map[event];
22 for handler in pairs(_handlers) do
23 t_insert(index, handler);
25 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
26 handlers[event] = index;
28 local function add_handler(event, handler, priority)
29 local map = event_map[event];
31 map[handler] = priority or 0;
33 map = {[handler] = priority or 0};
34 event_map[event] = map;
36 _rebuild_index(event);
38 local function remove_handler(event, handler)
39 local map = event_map[event];
42 _rebuild_index(event);
45 local function add_handlers(handlers)
46 for event, handler in pairs(handlers) do
47 add_handler(event, handler);
50 local function remove_handlers(handlers)
51 for event, handler in pairs(handlers) do
52 remove_handler(event, handler);
55 local function fire_event(event, ...)
56 local h = handlers[event];
59 local ret = h[i](...);
60 if ret ~= nil then return ret; end
65 add_handler = add_handler;
66 remove_handler = remove_handler;
67 add_handlers = add_handlers;
68 remove_handlers = remove_handlers;
69 fire_event = fire_event;
71 _event_map = event_map;