52 lines
1.9 KiB
Lua
52 lines
1.9 KiB
Lua
Event = { listeners = {} }
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-- can add multiple listeners to the same event.
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-- event_key can be a uint of native events (defines.events)
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-- event_key can be a string for custom input of virtual events
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-- if a virtual event is added, set virtual = true
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-- on_init, on_load, on_configuration_changed get triggered automatically as virtual events
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Event.addListener = function(event_key, add_callback, virtual)
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if not Event.listeners[event_key] then
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Event.listeners[event_key] = {}
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Event.listeners[event_key].callbacks = {}
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Event.listeners[event_key].sequence = function (event)
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for _, callback in pairs(Event.listeners[event_key].callbacks) do
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callback(event)
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end
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end
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if not virtual then -- custom input eventsm only works after on_init
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script.on_event(event_key, Event.listeners[event_key].sequence)
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end
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table.insert(Event.listeners[event_key].callbacks, add_callback)
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else
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for _, callback in pairs(Event.listeners[event_key].callbacks) do
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if callback == add_callback then return end
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end
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if not exists then
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table.insert(Event.listeners[event_key].callbacks, add_callback)
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end
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end
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end
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-- can add multiple listneers to the same event.
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Event.removeListener = function(event_key, remove_callback)
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if not Event.listeners[event_key] then return end
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for _, callback in pairs(Event.listeners[event_key].callbacks) do
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if callback == remove_callback then
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Event.listeners[event_key].callbacks[_] = nil
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end
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end
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end
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Event.trigger = function(event_key, event_data)
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if Event.listeners[event_key] then
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Event.listeners[event_key].sequence(event_data)
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end
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end
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script.on_init(function(event) Event.trigger("on_init", event) end)
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script.on_load(function(event) Event.trigger("on_load", event) end)
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script.on_configuration_changed(function(event) Event.trigger("on_configuration_changed", event) end)
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return Event
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