- user-submitted change care of JX:

Added mechanism to provide common throttled updates to all bars, even those that are hidden.
Added "Display when ready" option to Custom Cooldown bar to replace "Display when empty" toggle.
Modified Custom Cooldown bar to use common throttled updates. This should be rolled out to all bars eventually.
Tidied up display of spell icons in Custom Cooldown bar. There was a problem with the appropriate aura icon not being loaded correctly until the spell had fired.

IceCore.lua

@@ -16,6 +16,9 @@ IceCore.RegisterModule = "IceCore_RegisterModule"
 -- Private variables --
 IceCore.prototype.settings = nil
 IceCore.prototype.IceHUDFrame = nil
+IceCore.prototype.updatees = {}
+IceCore.prototype.updatee_count = 0
+IceCore.prototype.update_elapsed = 0
 IceCore.prototype.elements = {}
 IceCore.prototype.enabled = nil
 IceCore.prototype.presets = {}
@@ -69,7 +72,9 @@ function IceCore.prototype:SetupDefaults()
 		barBlendMode = "BLEND",
 		barBgBlendMode = "BLEND",
 
-		bShouldUseDogTags = true
+		bShouldUseDogTags = true,
+
+		updatePeriod = 0.1
 	}
 
 	self:LoadPresets()
@@ -133,6 +138,9 @@ function IceCore.prototype:Enable()
 		end
 	end
 
+	if self.settings.updatePeriod == nil then
+		self.settings.updatePeriod = 0.1
+	end
 
 	-- make sure the module options are re-generated. if we switched profiles, we don't want the old elements hanging around
 	IceHUD:GenerateModuleOptions()
@@ -588,6 +596,50 @@ function IceCore.prototype:SetShouldUseDogTags(should)
 	self.settings.bShouldUseDogTags = should
 end
 
+function IceCore.prototype:UpdatePeriod()
+	return self.settings.updatePeriod
+end
+
+function IceCore.prototype:SetUpdatePeriod(period)
+	self.settings.updatePeriod = period
+end
+
+-- For elements that want to receive updates even when hidden
+function IceCore.HandleUpdates(frame, elapsed)
+	local update_period = IceHUD.IceCore:UpdatePeriod()
+	IceCore.prototype.update_elapsed = IceCore.prototype.update_elapsed + elapsed
+	if (IceCore.prototype.update_elapsed > update_period) then
+		for frame, func in pairs(IceCore.prototype.updatees)
+		do
+			func()
+		end
+		if (elapsed > update_period) then
+			IceCore.prototype.update_elapsed = 0
+		else
+			IceCore.prototype.update_elapsed = IceCore.prototype.update_elapsed - update_period
+		end
+	end
+end
+
+function IceCore.prototype:RequestUpdates(frame, func)
+	if self.updatees[frame] then
+		if not func then
+			self.updatee_count = self.updatee_count - 1
+		end
+	else
+		if func then
+			self.updatee_count = self.updatee_count + 1
+		end
+	end
+
+	if (self.updatee_count == 0) then
+		self.IceHUDFrame:SetScript("OnUpdate", nil)
+	else
+		self.IceHUDFrame:SetScript("OnUpdate", IceCore.HandleUpdates)
+	end
+
+	self.updatees[frame] = func
+end
 
 -------------------------------------------------------------------------------
 -- Presets                                                                   --