Animations: absolute alpha and setToFinalAlpha, combat feedback text fades on an animation group

Combat feedback text fades in, holds and fades out on an animation group
on the font string instead of an OnUpdate helper frame. Autohide and the
XP/rep bars keep the faded-out alpha with SetToFinalAlpha instead of an
OnFinished that sets it. Pulses, the mail blink, the holiday dusk and the
candle flicker give their alphas with SetFromAlpha / SetToAlpha.

api/api.lua

@@ -1404,10 +1404,10 @@ function pfUI.api.EnableAutohide(frame, timeout, combat)
 
   if not frame.hover.fade then
     frame.hover.fade = frame:CreateAnimationGroup()
+    frame.hover.fade:SetToFinalAlpha(true)
     local fade = frame.hover.fade:CreateAnimation("Alpha")
     fade:SetChange(-1)
     fade:SetDuration(1)
-    frame.hover.fade:SetScript("OnFinished", function() frame:SetAlpha(0) end)
   end
 
   if combat then

api/unitframes.lua

@@ -781,7 +781,6 @@ function pfUI.uf:UpdateConfig()
   if f.config.hitindicator == "1" then
     f.feedbackText:SetFont(pfUI.media[f.config.hitindicatorfont], f.config.hitindicatorsize, "OUTLINE")
     f.feedbackFontHeight = f.config.hitindicatorsize
-    f.feedbackStartTime = GetTime()
     if f.config.portrait == "bar" or f.config.portrait == "off" then
       f.feedbackText:SetParent(f.texts)
       f.feedbackText:ClearAllPoints()
@@ -793,8 +792,8 @@ function pfUI.uf:UpdateConfig()
     end
     f.combatfeedback = true
   else
+    f.feedback:Stop()
     f.feedbackText:Hide()
-    f.feedback:Hide()
     f.combatfeedback = nil
   end
 
@@ -1177,8 +1176,10 @@ function pfUI.uf.OnEvent()
     elseif event == "UNIT_CONNECTION" then
       pfUI.uf:QueueUpdate(this, "full")
     elseif event == "UNIT_COMBAT" then
+      -- every hit starts the fade over
+      this.feedback:Stop()
       CombatFeedback_OnCombatEvent(arg2, arg3, arg4, arg5)
-      this.feedback:Show()
+      this.feedback:Play()
     elseif event == "INCOMING_RESURRECT_CHANGED" then
       pfUI.uf:QueueUpdate(this, "indicators")
     else
@@ -1317,25 +1318,6 @@ C_Timer.NewTicker(.5, function()
   end
 end)
 
--- Fade the combat feedback text in, hold it, and fade it out -- the timing of
--- CombatFeedback_OnUpdate. Runs on a child frame shown only while the text is.
-local function FeedbackOnUpdate()
-  local frame = this:GetParent()
-  local text = frame.feedbackText
-  local elapsed = GetTime() - frame.feedbackStartTime
-  local fadein, hold = COMBATFEEDBACK_FADEINTIME, COMBATFEEDBACK_HOLDTIME
-  if elapsed < fadein then
-    text:SetAlpha(elapsed / fadein)
-  elseif elapsed < fadein + hold then
-    text:SetAlpha(1)
-  elseif elapsed < fadein + hold + COMBATFEEDBACK_FADEOUTTIME then
-    text:SetAlpha(1 - (elapsed - hold - fadein) / COMBATFEEDBACK_FADEOUTTIME)
-  else
-    text:Hide()
-    this:Hide()
-  end
-end
-
 -- The unit events whose arg1 is the frame's OWN unit -- everything the OnEvent
 -- routes through its "UNIT_XXX Events" branch. These are not registered here:
 -- UpdateVisibility owns them, because it owns the frame's unit (below).
@@ -1592,11 +1574,11 @@ function pfUI.uf:CreateUnitFrame(unit, id, config, tick)
   f.glow = CreateFrame("Frame", nil, f)
   -- Pulse between .8 and .4 for good. The group only advances while the glow
   -- is shown, so a hidden glow costs nothing.
-  f.glow:SetAlpha(.8)
   f.glow.pulse = f.glow:CreateAnimationGroup()
   f.glow.pulse:SetLooping("BOUNCE")
   local fade = f.glow.pulse:CreateAnimation("Alpha")
-  fade:SetChange(-.4)
+  fade:SetFromAlpha(.8)
+  fade:SetToAlpha(.4)
   fade:SetDuration(1.3)
   fade:SetSmoothing("IN_OUT")
   f.glow.pulse:Play()
@@ -1654,9 +1636,21 @@ function pfUI.uf:CreateUnitFrame(unit, id, config, tick)
   f.portrait.model = CreateFrame("PlayerModel", "pfPortraitModel" .. f.label .. f.id, f.portrait)
   f.portrait.model.next = CreateFrame("PlayerModel", nil, nil)
   f.feedbackText = f:CreateFontString("pfHitIndicator" .. f.label .. f.id, "OVERLAY", "NumberFontNormalHuge")
-  f.feedback = CreateFrame("Frame", nil, f)
+
-  f.feedback:Hide()
+  -- Fade the combat feedback text in, hold it, and fade it out -- the timing
-  f.feedback:SetScript("OnUpdate", FeedbackOnUpdate)
+  -- of CombatFeedback_OnUpdate -- then hide it.
+  f.feedback = f.feedbackText:CreateAnimationGroup()
+  local fadein = f.feedback:CreateAnimation("Alpha")
+  fadein:SetOrder(1)
+  fadein:SetDuration(COMBATFEEDBACK_FADEINTIME)
+  fadein:SetToAlpha(1)
+  local fadeout = f.feedback:CreateAnimation("Alpha")
+  fadeout:SetOrder(2)
+  fadeout:SetStartDelay(COMBATFEEDBACK_HOLDTIME)
+  fadeout:SetDuration(COMBATFEEDBACK_FADEOUTTIME)
+  fadeout:SetFromAlpha(1)
+  fadeout:SetToAlpha(0)
+  f.feedback:SetScript("OnFinished", function() f.feedbackText:Hide() end)
 
   if f.label == "raid" and mod(f.id, 5) == 1 then
     local group = math.ceil(f.id/5)

modules/easteregg.lua

@@ -30,15 +30,15 @@ pfUI:RegisterModule("easteregg", function ()
     scene.dtext:SetPoint("TOP", 0, -430)
     scene.dtext:SetText(info and info .. "\n\n" .. exit or exit)
 
-    -- Fade the night in by playing a fade-out backwards. The scene keeps an
+    -- Fade the night in. The scene keeps an alpha of 1, which comes back
-    -- alpha of 1, which comes back when the fade ends.
+    -- when the fade ends.
     scene.dusk = scene:CreateAnimationGroup()
     local fade = scene.dusk:CreateAnimation("Alpha")
-    fade:SetChange(-1)
+    fade:SetToAlpha(1)
     fade:SetDuration(.8)
 
     scene:SetScript("OnShow", function()
-      this.dusk:Play(true)
+      this.dusk:Play()
     end)
 
     -- start over on the next AFK
@@ -159,7 +159,7 @@ pfUI:RegisterModule("easteregg", function ()
     halloween.text:SetTextColor(1, .5, 0)
 
     -- Candlelight glows in from the screen edges. It flickers in uneven
-    -- steps of { duration, change } that end where they began, so the loop
+    -- steps of { duration, alpha } that end where they began, so the loop
     -- never jumps.
     local candle = CreateFrame("Frame", nil, halloween)
     candle:SetAllPoints()
@@ -169,16 +169,19 @@ pfUI:RegisterModule("easteregg", function ()
     candle.flicker = candle:CreateAnimationGroup()
     candle.flicker:SetLooping("REPEAT")
     local steps = {
-      { .18, -.25 }, { .09, .1 }, { .22, -.2 }, { .14, .3 }, { .3, -.1 },
+      { .18, .75 }, { .09, .85 }, { .22, .65 }, { .14, .95 }, { .3, .85 },
-      { .11, -.15 }, { .2, .2 }, { .16, -.3 }, { .26, .25 }, { .12, .15 },
+      { .11, .7 }, { .2, .9 }, { .16, .6 }, { .26, .85 }, { .12, 1 },
     }
+    local from = 1
     for order, step in ipairs(steps) do
-      local duration, change = unpack(step)
+      local duration, alpha = unpack(step)
       local fade = candle.flicker:CreateAnimation("Alpha")
       fade:SetOrder(order)
       fade:SetDuration(duration)
-      fade:SetChange(change)
+      fade:SetFromAlpha(from)
+      fade:SetToAlpha(alpha)
       fade:SetSmoothing("IN_OUT")
+      from = alpha
     end
 
     -- Once the night has fallen, undead rise along the bottom one after

modules/minimap.lua

@@ -111,15 +111,16 @@ pfUI:RegisterModule("minimap", function ()
 
       -- Blink ten times between .9 and .1, then hide
       local highlight = this.highlight
-      highlight:SetAlpha(.9)
       highlight.blink = highlight:CreateAnimationGroup()
       for i = 1, 10 do
         local down = highlight.blink:CreateAnimation("Alpha")
-        down:SetChange(-.8)
+        down:SetFromAlpha(.9)
+        down:SetToAlpha(.1)
         down:SetDuration(.3)
         down:SetOrder(i * 2 - 1)
         local up = highlight.blink:CreateAnimation("Alpha")
-        up:SetChange(.8)
+        up:SetFromAlpha(.1)
+        up:SetToAlpha(.9)
         up:SetDuration(.3)
         up:SetOrder(i * 2)
       end

modules/tracking.lua

@@ -38,7 +38,8 @@ pfUI:RegisterModule("tracking", function ()
   pfUI.tracking.pulse = pfUI.tracking.icon:CreateAnimationGroup()
   pfUI.tracking.pulse:SetLooping("BOUNCE")
   local fade = pfUI.tracking.pulse:CreateAnimation("Alpha")
-  fade:SetChange(-.5)
+  fade:SetFromAlpha(1)
+  fade:SetToAlpha(.5)
   fade:SetDuration(.5)
   fade:SetSmoothing("IN_OUT")
 

modules/xpbar.lua

@@ -381,10 +381,10 @@ end
 
     if not b.fade then
       b.fade = b:CreateAnimationGroup()
+      b.fade:SetToFinalAlpha(true)
       local fade = b.fade:CreateAnimation("Alpha")
       fade:SetChange(-1)
       fade:SetDuration(.3)
-      b.fade:SetScript("OnFinished", function() b:SetAlpha(0) end)
     end
 
     b:RegisterEvent("FACTION_STANDING_CHANGED")