range: Use events to drive updates

elements/range.lua

@@ -28,11 +28,6 @@ Offline units are handled as if they are in range.
 local _, ns = ...
 local oUF = ns.oUF
 
-local _FRAMES = {}
-local OnRangeFrame
-
-local UnitInRange, UnitIsConnected = UnitInRange, UnitIsConnected
-
 local function Update(self, event)
 	local element = self.Range
 	local unit = self.unit
@@ -83,36 +78,14 @@ local function Path(self, ...)
 	return (self.Range.Override or Update) (self, ...)
 end
 
--- Internal updating method
-local timer = 0
-local function OnRangeUpdate(_, elapsed)
-	timer = timer + elapsed
-
-	if(timer >= .20) then
-		for _, object in next, _FRAMES do
-			if(object:IsShown()) then
-				Path(object, 'OnUpdate')
-			end
-		end
-
-		timer = 0
-	end
-end
-
 local function Enable(self)
 	local element = self.Range
 	if(element) then
 		element.__owner = self
 		element.insideAlpha = element.insideAlpha or 1
 		element.outsideAlpha = element.outsideAlpha or 0.55
 
-		if(not OnRangeFrame) then
-			OnRangeFrame = CreateFrame('Frame')
-			OnRangeFrame:SetScript('OnUpdate', OnRangeUpdate)
-		end
-
-		table.insert(_FRAMES, self)
-		OnRangeFrame:Show()
+		self:RegisterEvent('UNIT_IN_RANGE_UPDATE', Path)
 
 		return true
 	end
@@ -121,17 +94,9 @@ end
 local function Disable(self)
 	local element = self.Range
 	if(element) then
-		for index, frame in next, _FRAMES do
-			if(frame == self) then
-				table.remove(_FRAMES, index)
-				break
-			end
-		end
 		self:SetAlpha(element.insideAlpha)
 
-		if(#_FRAMES == 0) then
-			OnRangeFrame:Hide()
-		end
+		self:UnregisterEvent('UNIT_IN_RANGE_UPDATE', Path)
 	end
 end