diff --git a/DruidBarClassic.toc b/DruidBarClassic.toc
index 72785b1..f482a4d 100644
--- a/DruidBarClassic.toc
+++ b/DruidBarClassic.toc
@@ -7,7 +7,8 @@
## Version: 0.5
Libs\LibStub\LibStub.lua
-Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua
+Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua
Libs\LibDataBroker-1.1\LibDataBroker-1.1.lua
+Libs\LibDBIcon-1.0\LibDBIcon-1.0.lua
DruidBar.xml
diff --git a/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua b/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua
new file mode 100644
index 0000000..eaa0d5d
--- /dev/null
+++ b/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua
@@ -0,0 +1,238 @@
+--[[ $Id: CallbackHandler-1.0.lua 1131 2015-06-04 07:29:24Z nevcairiel $ ]]
+local MAJOR, MINOR = "CallbackHandler-1.0", 6
+local CallbackHandler = LibStub:NewLibrary(MAJOR, MINOR)
+
+if not CallbackHandler then return end -- No upgrade needed
+
+local meta = {__index = function(tbl, key) tbl[key] = {} return tbl[key] end}
+
+-- Lua APIs
+local tconcat = table.concat
+local assert, error, loadstring = assert, error, loadstring
+local setmetatable, rawset, rawget = setmetatable, rawset, rawget
+local next, select, pairs, type, tostring = next, select, pairs, type, tostring
+
+-- Global vars/functions that we don't upvalue since they might get hooked, or upgraded
+-- List them here for Mikk's FindGlobals script
+-- GLOBALS: geterrorhandler
+
+local xpcall = xpcall
+
+local function errorhandler(err)
+ return geterrorhandler()(err)
+end
+
+local function CreateDispatcher(argCount)
+ local code = [[
+ local next, xpcall, eh = ...
+
+ local method, ARGS
+ local function call() method(ARGS) end
+
+ local function dispatch(handlers, ...)
+ local index
+ index, method = next(handlers)
+ if not method then return end
+ local OLD_ARGS = ARGS
+ ARGS = ...
+ repeat
+ xpcall(call, eh)
+ index, method = next(handlers, index)
+ until not method
+ ARGS = OLD_ARGS
+ end
+
+ return dispatch
+ ]]
+
+ local ARGS, OLD_ARGS = {}, {}
+ for i = 1, argCount do ARGS[i], OLD_ARGS[i] = "arg"..i, "old_arg"..i end
+ code = code:gsub("OLD_ARGS", tconcat(OLD_ARGS, ", ")):gsub("ARGS", tconcat(ARGS, ", "))
+ return assert(loadstring(code, "safecall Dispatcher["..argCount.."]"))(next, xpcall, errorhandler)
+end
+
+local Dispatchers = setmetatable({}, {__index=function(self, argCount)
+ local dispatcher = CreateDispatcher(argCount)
+ rawset(self, argCount, dispatcher)
+ return dispatcher
+end})
+
+--------------------------------------------------------------------------
+-- CallbackHandler:New
+--
+-- target - target object to embed public APIs in
+-- RegisterName - name of the callback registration API, default "RegisterCallback"
+-- UnregisterName - name of the callback unregistration API, default "UnregisterCallback"
+-- UnregisterAllName - name of the API to unregister all callbacks, default "UnregisterAllCallbacks". false == don't publish this API.
+
+function CallbackHandler:New(target, RegisterName, UnregisterName, UnregisterAllName)
+
+ RegisterName = RegisterName or "RegisterCallback"
+ UnregisterName = UnregisterName or "UnregisterCallback"
+ if UnregisterAllName==nil then -- false is used to indicate "don't want this method"
+ UnregisterAllName = "UnregisterAllCallbacks"
+ end
+
+ -- we declare all objects and exported APIs inside this closure to quickly gain access
+ -- to e.g. function names, the "target" parameter, etc
+
+
+ -- Create the registry object
+ local events = setmetatable({}, meta)
+ local registry = { recurse=0, events=events }
+
+ -- registry:Fire() - fires the given event/message into the registry
+ function registry:Fire(eventname, ...)
+ if not rawget(events, eventname) or not next(events[eventname]) then return end
+ local oldrecurse = registry.recurse
+ registry.recurse = oldrecurse + 1
+
+ Dispatchers[select('#', ...) + 1](events[eventname], eventname, ...)
+
+ registry.recurse = oldrecurse
+
+ if registry.insertQueue and oldrecurse==0 then
+ -- Something in one of our callbacks wanted to register more callbacks; they got queued
+ for eventname,callbacks in pairs(registry.insertQueue) do
+ local first = not rawget(events, eventname) or not next(events[eventname]) -- test for empty before. not test for one member after. that one member may have been overwritten.
+ for self,func in pairs(callbacks) do
+ events[eventname][self] = func
+ -- fire OnUsed callback?
+ if first and registry.OnUsed then
+ registry.OnUsed(registry, target, eventname)
+ first = nil
+ end
+ end
+ end
+ registry.insertQueue = nil
+ end
+ end
+
+ -- Registration of a callback, handles:
+ -- self["method"], leads to self["method"](self, ...)
+ -- self with function ref, leads to functionref(...)
+ -- "addonId" (instead of self) with function ref, leads to functionref(...)
+ -- all with an optional arg, which, if present, gets passed as first argument (after self if present)
+ target[RegisterName] = function(self, eventname, method, ... --[[actually just a single arg]])
+ if type(eventname) ~= "string" then
+ error("Usage: "..RegisterName.."(eventname, method[, arg]): 'eventname' - string expected.", 2)
+ end
+
+ method = method or eventname
+
+ local first = not rawget(events, eventname) or not next(events[eventname]) -- test for empty before. not test for one member after. that one member may have been overwritten.
+
+ if type(method) ~= "string" and type(method) ~= "function" then
+ error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - string or function expected.", 2)
+ end
+
+ local regfunc
+
+ if type(method) == "string" then
+ -- self["method"] calling style
+ if type(self) ~= "table" then
+ error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): self was not a table?", 2)
+ elseif self==target then
+ error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): do not use Library:"..RegisterName.."(), use your own 'self'", 2)
+ elseif type(self[method]) ~= "function" then
+ error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - method '"..tostring(method).."' not found on self.", 2)
+ end
+
+ if select("#",...)>=1 then -- this is not the same as testing for arg==nil!
+ local arg=select(1,...)
+ regfunc = function(...) self[method](self,arg,...) end
+ else
+ regfunc = function(...) self[method](self,...) end
+ end
+ else
+ -- function ref with self=object or self="addonId" or self=thread
+ if type(self)~="table" and type(self)~="string" and type(self)~="thread" then
+ error("Usage: "..RegisterName.."(self or \"addonId\", eventname, method): 'self or addonId': table or string or thread expected.", 2)
+ end
+
+ if select("#",...)>=1 then -- this is not the same as testing for arg==nil!
+ local arg=select(1,...)
+ regfunc = function(...) method(arg,...) end
+ else
+ regfunc = method
+ end
+ end
+
+
+ if events[eventname][self] or registry.recurse<1 then
+ -- if registry.recurse<1 then
+ -- we're overwriting an existing entry, or not currently recursing. just set it.
+ events[eventname][self] = regfunc
+ -- fire OnUsed callback?
+ if registry.OnUsed and first then
+ registry.OnUsed(registry, target, eventname)
+ end
+ else
+ -- we're currently processing a callback in this registry, so delay the registration of this new entry!
+ -- yes, we're a bit wasteful on garbage, but this is a fringe case, so we're picking low implementation overhead over garbage efficiency
+ registry.insertQueue = registry.insertQueue or setmetatable({},meta)
+ registry.insertQueue[eventname][self] = regfunc
+ end
+ end
+
+ -- Unregister a callback
+ target[UnregisterName] = function(self, eventname)
+ if not self or self==target then
+ error("Usage: "..UnregisterName.."(eventname): bad 'self'", 2)
+ end
+ if type(eventname) ~= "string" then
+ error("Usage: "..UnregisterName.."(eventname): 'eventname' - string expected.", 2)
+ end
+ if rawget(events, eventname) and events[eventname][self] then
+ events[eventname][self] = nil
+ -- Fire OnUnused callback?
+ if registry.OnUnused and not next(events[eventname]) then
+ registry.OnUnused(registry, target, eventname)
+ end
+ end
+ if registry.insertQueue and rawget(registry.insertQueue, eventname) and registry.insertQueue[eventname][self] then
+ registry.insertQueue[eventname][self] = nil
+ end
+ end
+
+ -- OPTIONAL: Unregister all callbacks for given selfs/addonIds
+ if UnregisterAllName then
+ target[UnregisterAllName] = function(...)
+ if select("#",...)<1 then
+ error("Usage: "..UnregisterAllName.."([whatFor]): missing 'self' or \"addonId\" to unregister events for.", 2)
+ end
+ if select("#",...)==1 and ...==target then
+ error("Usage: "..UnregisterAllName.."([whatFor]): supply a meaningful 'self' or \"addonId\"", 2)
+ end
+
+
+ for i=1,select("#",...) do
+ local self = select(i,...)
+ if registry.insertQueue then
+ for eventname, callbacks in pairs(registry.insertQueue) do
+ if callbacks[self] then
+ callbacks[self] = nil
+ end
+ end
+ end
+ for eventname, callbacks in pairs(events) do
+ if callbacks[self] then
+ callbacks[self] = nil
+ -- Fire OnUnused callback?
+ if registry.OnUnused and not next(callbacks) then
+ registry.OnUnused(registry, target, eventname)
+ end
+ end
+ end
+ end
+ end
+ end
+
+ return registry
+end
+
+
+-- CallbackHandler purposefully does NOT do explicit embedding. Nor does it
+-- try to upgrade old implicit embeds since the system is selfcontained and
+-- relies on closures to work.
+
diff --git a/Libs/CallbackHandler-1.0/CallbackHandler-1.0.xml b/Libs/CallbackHandler-1.0/CallbackHandler-1.0.xml
new file mode 100644
index 0000000..a5b22a7
--- /dev/null
+++ b/Libs/CallbackHandler-1.0/CallbackHandler-1.0.xml
@@ -0,0 +1,4 @@
+<Ui xmlns="http://www.blizzard.com/wow/ui/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.blizzard.com/wow/ui/
+..\FrameXML\UI.xsd">
+ <Script file="CallbackHandler-1.0.lua"/>
+</Ui>