Allow size and range check features to be configured.

This also improves the range check to fall back to UnitInRange if no
friendly spell is available

src/types/unitframe.lua

@@ -44,15 +44,25 @@ local colors = {
     white = {1.0, 1.0, 1.0}
 }
 
-function UnitFrame:Init(unit, width, height, hideInRaid)
+function UnitFrame:Init(unit, config)
+    local width = config.size.width
+    local height = config.size.height
+
     self.unit = unit
-    self.hideInRaid = hideInRaid or false
+    self.hideInRaid = config.hideInRaid
+
+    self.rangeFriendly = config.range.friendly
+    self.rangeEnemy = config.range.enemy
+    self.rangeFade = config.range.fade
+
     local secure = self:CreateSecureFrame(width, height)
     secure:Hide()
+
     self.hp = StatusBar:new(self, width, height, 0, true)
     self.power = StatusBar:new(self, width, 6, 2, false)
     self.power:Hide()
     self.auras = AuraList:new(self)
+
     local overlays = CreateFrame("Frame", nil, secure)
     overlays:SetFrameStrata("MEDIUM")
     overlays:SetFrameLevel(100)
@@ -118,16 +128,44 @@ function UnitFrame:StopRangeTicker()
     end
 end
 
+-- Returns
+--  true if the unit is in range
+--  false if the unit is not in range
+--  nil if it could not be determined 
+function UnitFrame:IsInRange()
+    local unit = self.unit
+    local friendlySpell = self.rangeFriendly
+    local enemySpell = self.rangeEnemy
+
+    -- Prefer to use configured spells
+    if friendlySpell and UnitCanAssist("player", unit) then
+        return IsSpellInRange(friendlySpell, unit) == 1
+    elseif enemySpell and UnitCanAttack("player", unit) then
+        return IsSpellInRange(enemySpell, unit) == 1
+    end
+    
+    -- Fall back to raid/party only range check 
+    local inRange, checkedRange = UnitInRange(unit)
+    if checkedRange then
+        return inRange
+    end
+
+    return nil
+end
+
 function UnitFrame:UpdateRange()
     local unit = self.unit
-    if UnitIsDead(unit) then
+    
+    if UnitIsDeadOrGhost(unit) then
+        self.secureFrame:SetAlpha(1.0)
+        return
+    end
+
+    local inRange = self:IsInRange()
+    if inRange or inRange == nil then
         self.secureFrame:SetAlpha(1.0)
-    elseif not UnitIsFriend("player", unit) and IsSpellInRange("Lightning Bolt", unit) ~= 1 then
-        self.secureFrame:SetAlpha(0.2)
-    elseif UnitIsFriend("player", unit) and IsSpellInRange("Healing Surge", unit) ~= 1 then
-        self.secureFrame:SetAlpha(0.2)
     else
-        self.secureFrame:SetAlpha(1.0)
+        self.secureFrame:SetAlpha(self.rangeFade)
     end
 end