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1 --- AceEvent-3.0 provides event registration and secure dispatching.
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2 -- All dispatching is done using **CallbackHandler-1.0**. AceEvent is a simple wrapper around
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3 -- CallbackHandler, and dispatches all game events or addon message to the registrees.
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4 --
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5 -- **AceEvent-3.0** can be embeded into your addon, either explicitly by calling AceEvent:Embed(MyAddon) or by
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6 -- specifying it as an embeded library in your AceAddon. All functions will be available on your addon object
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7 -- and can be accessed directly, without having to explicitly call AceEvent itself.\\
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8 -- It is recommended to embed AceEvent, otherwise you'll have to specify a custom `self` on all calls you
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9 -- make into AceEvent.
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10 -- @class file
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11 -- @name AceEvent-3.0
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12 -- @release $Id: AceEvent-3.0.lua 877 2009-11-02 15:56:50Z nevcairiel $
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13 local MAJOR, MINOR = "AceEvent-3.0", 3
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14 local AceEvent = LibStub:NewLibrary(MAJOR, MINOR)
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15
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16 if not AceEvent then return end
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17
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18 -- Lua APIs
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19 local pairs = pairs
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20
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21 local CallbackHandler = LibStub:GetLibrary("CallbackHandler-1.0")
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22
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23 AceEvent.frame = AceEvent.frame or CreateFrame("Frame", "AceEvent30Frame") -- our event frame
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24 AceEvent.embeds = AceEvent.embeds or {} -- what objects embed this lib
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25
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26 -- APIs and registry for blizzard events, using CallbackHandler lib
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27 if not AceEvent.events then
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28 AceEvent.events = CallbackHandler:New(AceEvent,
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29 "RegisterEvent", "UnregisterEvent", "UnregisterAllEvents")
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30 end
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31
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32 function AceEvent.events:OnUsed(target, eventname)
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33 AceEvent.frame:RegisterEvent(eventname)
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34 end
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35
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36 function AceEvent.events:OnUnused(target, eventname)
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37 AceEvent.frame:UnregisterEvent(eventname)
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38 end
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39
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40
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41 -- APIs and registry for IPC messages, using CallbackHandler lib
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42 if not AceEvent.messages then
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43 AceEvent.messages = CallbackHandler:New(AceEvent,
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44 "RegisterMessage", "UnregisterMessage", "UnregisterAllMessages"
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45 )
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46 AceEvent.SendMessage = AceEvent.messages.Fire
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47 end
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48
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49 --- embedding and embed handling
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50 local mixins = {
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51 "RegisterEvent", "UnregisterEvent",
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52 "RegisterMessage", "UnregisterMessage",
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53 "SendMessage",
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54 "UnregisterAllEvents", "UnregisterAllMessages",
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55 }
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56
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57 --- Register for a Blizzard Event.
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58 -- The callback will always be called with the event as the first argument, and if supplied, the `arg` as second argument.
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59 -- Any arguments to the event will be passed on after that.
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60 -- @name AceEvent:RegisterEvent
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61 -- @class function
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62 -- @paramsig event[, callback [, arg]]
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63 -- @param event The event to register for
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64 -- @param callback The callback function to call when the event is triggered (funcref or method, defaults to a method with the event name)
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65 -- @param arg An optional argument to pass to the callback function
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66
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67 --- Unregister an event.
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68 -- @name AceEvent:UnregisterEvent
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69 -- @class function
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70 -- @paramsig event
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71 -- @param event The event to unregister
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72
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73 --- Register for a custom AceEvent-internal message.
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74 -- The callback will always be called with the event as the first argument, and if supplied, the `arg` as second argument.
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75 -- Any arguments to the event will be passed on after that.
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76 -- @name AceEvent:RegisterMessage
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77 -- @class function
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78 -- @paramsig message[, callback [, arg]]
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79 -- @param message The message to register for
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80 -- @param callback The callback function to call when the message is triggered (funcref or method, defaults to a method with the event name)
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81 -- @param arg An optional argument to pass to the callback function
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82
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83 --- Unregister a message
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84 -- @name AceEvent:UnregisterMessage
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85 -- @class function
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86 -- @paramsig message
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87 -- @param message The message to unregister
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88
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89 --- Send a message over the AceEvent-3.0 internal message system to other addons registered for this message.
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90 -- @name AceEvent:SendMessage
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91 -- @class function
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92 -- @paramsig message, ...
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93 -- @param message The message to send
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94 -- @param ... Any arguments to the message
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95
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96
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97 -- Embeds AceEvent into the target object making the functions from the mixins list available on target:..
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98 -- @param target target object to embed AceEvent in
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99 function AceEvent:Embed(target)
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100 for k, v in pairs(mixins) do
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101 target[v] = self[v]
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102 end
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103 self.embeds[target] = true
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104 return target
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105 end
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106
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107 -- AceEvent:OnEmbedDisable( target )
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108 -- target (object) - target object that is being disabled
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109 --
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110 -- Unregister all events messages etc when the target disables.
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111 -- this method should be called by the target manually or by an addon framework
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112 function AceEvent:OnEmbedDisable(target)
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113 target:UnregisterAllEvents()
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114 target:UnregisterAllMessages()
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115 end
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116
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117 -- Script to fire blizzard events into the event listeners
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118 local events = AceEvent.events
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119 AceEvent.frame:SetScript("OnEvent", function(this, event, ...)
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120 events:Fire(event, ...)
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121 end)
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122
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123 --- Finally: upgrade our old embeds
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124 for target, v in pairs(AceEvent.embeds) do
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125 AceEvent:Embed(target)
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126 end
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