vanilla-wow-addons – Rev 1

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-- ************************************* --
-- ** This embed requires Metrognome! ** --
-- ************************************* --
-------------------------------------------

if not Metrognome then ChatFrame1:AddMessage("<SEEmbedKeys> Metrognome is not installed!") return end

local vmajor, vminor = "Keys 1", tonumber(string.sub("$Revision: 7132 $", 12, -3))
local stubvarname = "TekLibStub"
local libvarname = "SpecialEventsEmbed"


-- Check to see if an update is needed
-- if not then just return out now before we do anything
local libobj = getglobal(libvarname)
if libobj and not libobj:NeedsUpgraded(vmajor, vminor) then return end


local stubobj = getglobal(stubvarname)
if not stubobj then
        stubobj = {}
        setglobal(stubvarname, stubobj)


        -- Instance replacement method, replace contents of old with that of new
        function stubobj:ReplaceInstance(old, new)
                 for k,v in pairs(old) do old[k]=nil end
                 for k,v in pairs(new) do old[k]=v end
        end


        -- Get a new copy of the stub
        function stubobj:NewStub(name)
                local newStub = {}
                self:ReplaceInstance(newStub, self)
                newStub.libName = name
                newStub.lastVersion = ''
                newStub.versions = {}
                return newStub
        end


        -- Get instance version
        function stubobj:NeedsUpgraded(vmajor, vminor)
                local versionData = self.versions[vmajor]
                if not versionData or versionData.minor < vminor then return true end
        end


        -- Get instance version
        function stubobj:GetInstance(version)
                if not version then version = self.lastVersion end
                local versionData = self.versions[version]
                if not versionData then print(string.format("<%s> Cannot find library version: %s", self.libName, version or "")) return end
                return versionData.instance
        end


        -- Register new instance
        function stubobj:Register(newInstance)
                 local version,minor = newInstance:GetLibraryVersion()
                 self.lastVersion = version
                 local versionData = self.versions[version]
                 if not versionData then
                                -- This one is new!
                                versionData = {
                                        instance = newInstance,
                                        minor = minor,
                                        old = {},
                                }
                                self.versions[version] = versionData
                                newInstance:LibActivate(self)
                                return newInstance
                 end
                 -- This is an update
                 local oldInstance = versionData.instance
                 local oldList = versionData.old
                 versionData.instance = newInstance
                 versionData.minor = minor
                 local skipCopy = newInstance:LibActivate(self, oldInstance, oldList)
                 table.insert(oldList, oldInstance)
                 if not skipCopy then
                                for i, old in ipairs(oldList) do self:ReplaceInstance(old, newInstance) end
                 end
                 return newInstance
        end
end


if not libobj then
        libobj = stubobj:NewStub(libvarname)
        setglobal(libvarname, libobj)
end

local lib = {}


-- Return the library's current version
function lib:GetLibraryVersion()
        return vmajor, vminor
end


function lib:RegisterEvent(caller, eventname, method)
        if not eventname or not caller then return end

        if not self.registrar[eventname] then self.registrar[eventname] = {} end
        self.registrar[eventname][caller] = method or eventname
        return true
end


function lib:UnregisterEvent(caller, eventname)
        if not eventname or not caller or not self.registrar[eventname]
                or not self.registrar[eventname][caller] then return end

        self.registrar[eventname][caller] = nil
        return true
end


function lib:UnregisterAllEvents(caller)
        if not caller then return end

        for _,v in pairs(self.registrar) do v[caller] = nil end
        return true
end


function lib:TriggerEvent(eventname)
        if not eventname or not self.registrar[eventname] then return end

        for i,v in pairs(self.registrar[eventname]) do
                if type(v) == "function" then v(i)
                elseif i[v] then i[v](i) end
        end
end


-- Activate a new instance of this library
function lib:LibActivate(stub, oldLib, oldList)
        self.metrognome = Metrognome:GetInstance("1")
        if oldLib then
                self.vars, self.registrar = oldLib.vars or {}, oldLib.registrar or {}
                self.metrognome:Unregister("SEEmbedKeys")
                self.metrognome:Unregister("SEEmbedKeys2") -- cause I forgot to change this crap before I committed it up ><
        else
                self.registrar, self.vars = {}, {}
        end
        self.metrognome:Register("SEEmbedKeys", self.OnTick, nil, self)
        self.metrognome:Start("SEEmbedKeys")
end


function lib:OnTick()
        local ctrl, shift, alt = IsControlKeyDown(), IsShiftKeyDown(), IsAltKeyDown()

        if ctrl  and not self.vars.ctrl  then self:TriggerEvent("SPECIAL_CTRLKEY_DOWN")  end
        if shift and not self.vars.shift then self:TriggerEvent("SPECIAL_SHIFTKEY_DOWN") end
        if alt   and not self.vars.alt   then self:TriggerEvent("SPECIAL_ALTKEY_DOWN")   end

        if not ctrl  and self.vars.ctrl  then self:TriggerEvent("SPECIAL_CTRLKEY_UP")  end
        if not shift and self.vars.shift then self:TriggerEvent("SPECIAL_SHIFTKEY_UP") end
        if not alt   and self.vars.alt   then self:TriggerEvent("SPECIAL_ALTKEY_UP")   end

        self.vars.ctrl, self.vars.shift, self.vars.alt = ctrl, shift, alt
end


--------------------------------
--      Load this bitch!      --
--------------------------------
libobj:Register(lib)