112 lines
3.2 KiB
Lua
112 lines
3.2 KiB
Lua
--[[
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Copyright (c) 2014 Team Sparkle
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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]]
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---
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-- Create a new event manager object.
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-- @return event_manager instance
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function event_manager()
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local this = {}
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-- Lets have some room to breathe
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this.ORDER_EARLIER = 0
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this.ORDER_EARLY = 10
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this.ORDER_DEFAULT = 20
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this.ORDER_LATE = 30
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this.ORDER_LATER = 40
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this.ORDER_MONITOR = 100
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local handlers = {}
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local function sort_handlers(one, two)
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return one.order < two.order
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end
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---
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-- Register a new event handler.
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-- @param event_type Event type name to be handled
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-- @param handler Function with parameters (event_type, event_data)
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-- @param order One of ORDER_* to determine the position in the list of handlers
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-- @param cancelled Whether or not to received cancelled events
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function this.register(event_type, handler, order, cancelled)
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cancelled = cancelled or false
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order = order or this.ORDER_DEFAULT
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if handlers[event_type] == nil then
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handlers[event_type] = {}
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end
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local event_handlers = handlers[event_type]
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event_handlers[#event_handlers + 1] = {
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handler = handler,
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order = order,
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cancelled = cancelled
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}
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table.sort(event_handlers, sort_handlers)
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end
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---
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-- Deregister a previously registered handler.
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-- @param event_type Event type name previously registered
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-- @param handler Function previously registered
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function this.deregister(event_type, handler)
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if handlers[event_type] == nil then
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return
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end
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local event_handlers = handlers[event_type]
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for i=#event_handlers,1,-1 do
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if event_handlers[i].handler == handler then
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table.remove(event_handlers, i)
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end
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end
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table.sort(event_handlers, sort_handlers)
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end
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---
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-- Fire an event.
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-- Event data can contain a "cancelled" attribute.
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-- @param event_type Event type name to be handled
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-- @param data Event data table
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-- @return data is returned for convenience
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function this.fire(event_type, data)
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if data.cancelled == nil then
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data.cancelled = false
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end
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local event_handlers = handlers[event_type]
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if event_handlers == nil then
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return data
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end
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for i, handler in ipairs(event_handlers) do
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if handler.cancelled or not data.cancelled then
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handler.handler(event_type, data)
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end
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end
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return data
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end
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return this
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end
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