53 lines
1.4 KiB
Lua
53 lines
1.4 KiB
Lua
local utils = wesnoth.require "wml-utils"
|
|
-- registers an event handler. note that, like all lua variables this is not persitent in savefiles,
|
|
-- so you have to call this function from a toplevel lua tag or from a preload event.
|
|
-- It is also not possible to use this for first_time_only=yes events.
|
|
|
|
if rawget(_G, "core_on_event") then
|
|
return rawget(_G, "core_on_event") -- prevent double execution
|
|
end
|
|
|
|
local event_handlers = {}
|
|
|
|
local old_on_event = wesnoth.game_events.on_event or function(eventname) end
|
|
wesnoth.game_events.on_event = function(eventname)
|
|
old_on_event(eventname)
|
|
local context = nil
|
|
for _, entry in pairs(event_handlers[eventname] or {}) do
|
|
if context == nil then
|
|
context = wesnoth.current.event_context
|
|
end
|
|
entry.h(context)
|
|
end
|
|
end
|
|
|
|
|
|
local function on_event(eventname, arg1, arg2)
|
|
if string.match(eventname, ",") then
|
|
for elem in utils.split(eventname or "") do
|
|
on_event(elem, arg1, arg2)
|
|
end
|
|
return
|
|
end
|
|
local priority = 0
|
|
local handler
|
|
if type(arg1) == "function" then
|
|
handler = arg1
|
|
else
|
|
priority = arg1
|
|
handler = arg2
|
|
end
|
|
eventname = string.gsub(eventname, " ", "_")
|
|
event_handlers[eventname] = event_handlers[eventname] or {}
|
|
local eh = event_handlers[eventname]
|
|
table.insert(eh, { h = handler, p = priority})
|
|
-- prioritize last entry
|
|
for i = #eh - 1, 1, -1 do
|
|
if eh[i].p < eh[i + 1].p then
|
|
eh[i], eh[i + 1] = eh[i + 1], eh[i]
|
|
end
|
|
end
|
|
end
|
|
|
|
core_on_event = on_event
|
|
return on_event
|