castbar: add pushback counter to channel bar

compat/tbc.lua

@@ -9,7 +9,8 @@ pfUI.module.autoshift = true
 pfUI.module.itemclick = true
 
 -- [[ Constants ]]--
-CASTBAR_DELAY_EVENT = "UNIT_SPELLCAST_DELAYED" -- UNIT_SPELLCAST_CHANNEL_UPDATE ?
+CASTBAR_EVENT_CAST_DELAY = "UNIT_SPELLCAST_DELAYED"
+CASTBAR_EVENT_CHANNEL_DELAY = "UNIT_SPELLCAST_CHANNEL_UPDATE"
 
 NAMEPLATE_OBJECTORDER = { "border", "glow", "_", "_", "name", "level",
   "levelicon", "raidicon" }

compat/vanilla.lua

@@ -4,7 +4,8 @@ setfenv(1, pfUI:GetEnvironment())
 if pfUI.client > 11200 then return end
 
 -- [[ Constants ]]--
-CASTBAR_DELAY_EVENT = "SPELLCAST_DELAYED" -- SPELLCAST_CHANNEL_UPDATE ?
+CASTBAR_EVENT_CAST_DELAY = "SPELLCAST_DELAYED"
+CASTBAR_EVENT_CHANNEL_DELAY = "SPELLCAST_CHANNEL_UPDATE"
 
 NAMEPLATE_OBJECTORDER = { "border", "glow", "name", "level", "levelicon",
   "raidicon" }

modules/castbar.lua

@@ -121,10 +121,16 @@ pfUI:RegisterModule("castbar", function ()
     end)
 
     -- register for spell delay
-    cb:RegisterEvent(CASTBAR_DELAY_EVENT)
+    cb:RegisterEvent(CASTBAR_EVENT_CAST_DELAY)
+    cb:RegisterEvent(CASTBAR_EVENT_CHANNEL_DELAY)
     cb:SetScript("OnEvent", function()
       if not UnitIsUnit(this.unitstr, "player") then return end
-      this.delay = ( this.delay or 0 ) + arg1/1000
+
+      if event == CASTBAR_EVENT_CAST_DELAY then
+        this.delay = ( this.delay or 0 ) + arg1/1000
+      elseif event == CASTBAR_EVENT_CHANNEL_DELAY then
+        this.delay = ( this.delay or 0 ) + this.bar:GetValue() - arg1/1000
+      end
     end)
 
     cb:SetAlpha(0)