44 lines
1.2 KiB
Lua
44 lines
1.2 KiB
Lua
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--- @class EventBus
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EventBus = {
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_handlers = {},
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new = function(self, o)
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o = o or {}
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setmetatable(o, self)
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self.__index = self
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return o
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end,
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---
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---@param self EventBus
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---@param event any
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---@param handler any
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---@param index any
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on = function(self, event, handler, index)
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if not self._handlers[event] then self._handlers[event] = {} end
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self:off(event, handler)
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if not index then
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table.insert(self._handlers[event], handler)
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else
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-- insertIntoTable(this.handlers[event], handler, index)
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end
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end,
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---
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---@param self EventBus
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---@param event any
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---@param handler any
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off = function(self, event, handler)
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if not self._handlers[event] then return end
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self._handlers[event] = table.filter(self._handlers[event], function(o) return o ~= handler end)
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end,
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---
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---@param self EventBus
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---@param event any
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---@param ... unknown
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emit = function(self, event, ...)
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trace("[EventBus] Emitted " .. event)
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if not self._handlers[event] then return end
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for k, handler in pairs(self._handlers[event]) do
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handler(...)
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end
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end
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}
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