feat: add EllesmereUIDamageMeter standalone addon

Blizzard C_DamageMeter API-powered damage meter with full EUI integration.

Core features:
- Class-colored bars with multiple icon styles (Fabled, Modern, Arcade, etc.)
- Per-player spell drill-down with spell icons and percentages
- Encounter/session selector with Current, Overall, and per-boss views
- Combined DPS/Damage and HPS/Healing display modes
- Scroll support for 40+ player raids
- Test mode with realistic data for all meter types

EUI integration:
- Lite addon lifecycle (OnEnable, NewDB, RegisterEvent)
- MakeBorder pixel-perfect borders
- Global font system via ResolveFontPath
- SetElementVisibility for flight/pet battle hiding
- Unlock mode registration with resize support
- Options page with live preview via RegisterModule/Widgets

Polish:
- Report to Chat (right-click bar → Party/Raid/Say/Guild)
- Bar hover highlight and local player indicator
- Group total in header timer display
- /euidm slash command (toggle, test, reset, report)
- Empty state message when no combat data
- Stale cache cleanup on reset and zone change

Original implementation by Trenchy.

Author: danvernon

EllesmereUIDamageMeter/EllesmereUIDamageMeter.toc

@@ -0,0 +1,16 @@
+## Interface: 120000, 120001
+## Title: |cff0cd39cEllesmere|r|cffffffffUI|r Damage Meter
+## Notes: Damage meter powered by Blizzard's C_DamageMeter API
+## Author: Trenchy
+## Version: 0.1
+## IconTexture: Interface\Icons\INV_Misc_Map_01
+## Dependencies: EllesmereUI
+## OptionalDeps: LibSharedMedia-3.0
+## SavedVariables: EllesmereUIDamageMeterDB
+
+core.lua
+bars.lua
+window.lua
+update.lua
+testdata.lua
+options.lua

EllesmereUIDamageMeter/bars.lua

@@ -0,0 +1,272 @@
+local addon = EllesmereUIDamageMeter
+local S = addon.S
+if not S then return end
+
+local floor = math.floor
+
+local MakeBorder = EllesmereUI.MakeBorder
+
+local GetClassColor = S.GetClassColor
+
+function S.CreateBar(parent)
+    local bar = {}
+
+    bar.frame = CreateFrame("Frame", nil, parent)
+
+    bar.background = bar.frame:CreateTexture(nil, "BACKGROUND")
+    bar.background:SetAllPoints()
+    bar.background:SetTexture(S.DEFAULT_TEX)
+    bar.background:SetVertexColor(0.15, 0.15, 0.15, 0.35)
+
+    bar.statusbar = CreateFrame("StatusBar", nil, bar.frame)
+    bar.statusbar:SetAllPoints()
+    bar.statusbar:SetStatusBarTexture(S.DEFAULT_TEX)
+    bar.statusbar:SetMinMaxValues(0, 1)
+    bar.statusbar:SetValue(0)
+    bar.statusbar.smoothing = Enum.StatusBarInterpolation and Enum.StatusBarInterpolation.ExponentialEaseOut or nil
+
+    bar.classIcon = bar.statusbar:CreateTexture(nil, "OVERLAY")
+    bar.classIcon:SetTexture(S.CLASS_ICONS)
+    bar.classIcon:SetSize(16, 16)
+    bar.classIcon:SetPoint("LEFT", 1, 0)
+    bar.classIcon:Hide()
+
+    bar.pctText = bar.statusbar:CreateFontString(nil, "OVERLAY")
+    bar.pctText:SetPoint("RIGHT", -4, 0)
+    bar.pctText:SetJustifyH("RIGHT")
+    bar.pctText:SetWordWrap(false)
+    bar.pctText:SetShadowOffset(1, -1)
+    bar.pctText:Hide()
+
+    bar.rightText = bar.statusbar:CreateFontString(nil, "OVERLAY")
+    bar.rightText:SetPoint("RIGHT", -4, 0)
+    bar.rightText:SetJustifyH("RIGHT")
+    bar.rightText:SetWordWrap(false)
+    bar.rightText:SetShadowOffset(1, -1)
+
+    bar.leftText = bar.statusbar:CreateFontString(nil, "OVERLAY")
+    bar.leftText:SetPoint("LEFT", 4, 0)
+    bar.leftText:SetPoint("RIGHT", bar.rightText, "LEFT", -4, 0)
+    bar.leftText:SetJustifyH("LEFT")
+    bar.leftText:SetWordWrap(false)
+    bar.leftText:SetShadowOffset(1, -1)
+
+    bar.border = MakeBorder(bar.frame, 0, 0, 0, 1)
+    bar.border._frame:SetFrameLevel(bar.statusbar:GetFrameLevel() + 2)
+    bar.border._frame:Hide()
+
+    bar.textFrame = CreateFrame("Frame", nil, bar.frame)
+    bar.textFrame:SetAllPoints()
+    bar.textFrame:SetFrameLevel(bar.border._frame:GetFrameLevel() + 1)
+
+    bar.leftText:SetParent(bar.textFrame)
+    bar.rightText:SetParent(bar.textFrame)
+    bar.pctText:SetParent(bar.textFrame)
+
+    bar.highlight = bar.statusbar:CreateTexture(nil, "ARTWORK")
+    bar.highlight:SetAllPoints()
+    bar.highlight:SetColorTexture(1, 1, 1, 0.1)
+    bar.highlight:Hide()
+
+    bar.selfIndicator = bar.frame:CreateTexture(nil, "ARTWORK")
+    bar.selfIndicator:SetPoint("TOPLEFT", bar.frame, "TOPLEFT", 0, 0)
+    bar.selfIndicator:SetPoint("BOTTOMLEFT", bar.frame, "BOTTOMLEFT", 0, 0)
+    bar.selfIndicator:SetWidth(2)
+    bar.selfIndicator:SetColorTexture(1, 1, 1, 0.6)
+    bar.selfIndicator:Hide()
+
+    bar.frame:EnableMouse(true)
+    bar.frame:Hide()
+    return bar
+end
+
+function S.ApplyBarIconLayout(bar, db)
+    local iconSize = max(8, (db.barHeight or 18) - 2)
+    bar.classIcon:SetSize(iconSize, iconSize)
+    bar.leftText:ClearAllPoints()
+    if db.showClassIcon then
+        bar.leftText:SetPoint("LEFT", bar.classIcon, "RIGHT", 2, 0)
+    else
+        bar.leftText:SetPoint("LEFT", 4, 0)
+    end
+    bar.leftText:SetPoint("RIGHT", bar.rightText, "LEFT", -4, 0)
+end
+
+function S.ApplyBarBorder(bar, db)
+    if db.barBorderEnabled then
+        bar.border._frame:Show()
+    else
+        bar.border._frame:Hide()
+    end
+end
+
+function S.ComputeNumVisible(win)
+    local db    = S.GetWinDB(win.index)
+    local barHt = max(1, db.barHeight or 18)
+
+    if not win.window then return 1 end
+    local availH = win.window:GetHeight() - S.HEADER_HEIGHT
+
+    if not availH or availH < 1 then return 1 end
+    local spacing = max(0, db.barSpacing or 1)
+    return max(1, floor(availH / (barHt + spacing)))
+end
+
+function S.ResizeStandalone(win)
+    if not win or not win.window or not win.frame then return end
+
+    local db = S.GetWinDB(win.index)
+    local w, h = db.standaloneWidth, db.standaloneHeight
+    win.window:SetSize(w, h)
+
+    if win.window.mover then
+        win.window.mover:SetSize(w, h)
+    end
+
+    local barHt = max(1, db.barHeight or 18)
+    for i = 1, S.MAX_BARS do
+        if win.bars[i] then win.bars[i].frame:SetHeight(barHt) end
+    end
+end
+
+function S.EnterDrillDown(win, guid, name, classFilename)
+    win.drillSource = { guid = guid, name = name, class = classFilename }
+    win.scrollOffset = 0
+    S.RefreshWindow(win)
+end
+
+function S.ExitDrillDown(win)
+    if not win.drillSource then return end
+    win.drillSource = nil
+    win.scrollOffset = 0
+    S.RefreshWindow(win)
+end
+
+function S.GetDrillSpellCount(win)
+    local ds = win.drillSource
+    if not ds then return 0 end
+
+    if S.testMode then
+        local tdata = S.GetTestData(win)
+        for _, td in ipairs(tdata) do
+            if td.name == ds.name then return td.spells and #td.spells or 0 end
+        end
+        return 0
+    end
+
+    local meterType  = S.ResolveMeterType(S.MODE_ORDER[win.modeIndex])
+    local sourceData = ds.guid and S.GetSessionSource(win, meterType, ds.guid)
+    return (sourceData and sourceData.combatSpells) and #sourceData.combatSpells or 0
+end
+
+function S.SetupBarInteraction(bar, win)
+    bar.frame:SetScript("OnEnter", function(self)
+        if EllesmereUI._unlockActive then return end
+        bar.highlight:Show()
+        if win.drillSource then
+            if self.drillSpellID then
+                GameTooltip_SetDefaultAnchor(GameTooltip, self)
+                GameTooltip:SetSpellByID(self.drillSpellID)
+                GameTooltip:Show()
+            end
+            return
+        end
+
+        local unitShown = false
+        local guid = self.sourceGUID
+        if guid then
+            local unit = S.FindUnitByGUID(guid)
+            if unit then
+                GameTooltip_SetDefaultAnchor(GameTooltip, self)
+                GameTooltip:SetUnit(unit)
+                unitShown = true
+            end
+        end
+        if not unitShown then
+            GameTooltip_SetDefaultAnchor(GameTooltip, self)
+            if self.sourceName then
+                local cls = self.sourceClass
+                if not cls then cls = guid and S.classCache[guid] end
+                if not cls and self.testIndex then
+                    local td = S.GetTestData(win)[self.testIndex]
+                    if td then cls = td.class end
+                end
+                local cr, cg, cb = GetClassColor(cls)
+                GameTooltip:AddLine(self.sourceName, cr, cg, cb)
+            end
+        end
+        GameTooltip:AddLine("Click for spell breakdown", 0.7, 0.7, 0.7)
+        GameTooltip:Show()
+    end)
+
+    bar.frame:SetScript("OnLeave", function()
+        bar.highlight:Hide()
+        GameTooltip_Hide()
+    end)
+
+    bar.frame:SetScript("OnMouseUp", function(self, button)
+        if win.drillSource then
+            if button == "RightButton" then
+                S.ExitDrillDown(win)
+            end
+            return
+        end
+
+        if button == "LeftButton" then
+            GameTooltip:Hide()
+            if S.testMode and self.testIndex then
+                local td = S.GetTestData(win)[self.testIndex]
+                if td then
+                    S.EnterDrillDown(win, nil, td.name, td.class)
+                end
+                return
+            end
+            if self.sourceGUID and self.sourceName then
+                local class = S.classCache[self.sourceGUID]
+                S.EnterDrillDown(win, self.sourceGUID, self.sourceName, class)
+            end
+        elseif button == "RightButton" then
+            GameTooltip:Hide()
+            local addon = EllesmereUIDamageMeter
+            if addon and addon.ReportMeter then
+                MenuUtil.CreateContextMenu(self, function(_, rootDescription)
+                    rootDescription:CreateTitle("Report Meter")
+                    local channels = { {"Party", "PARTY"}, {"Raid", "RAID"}, {"Say", "SAY"}, {"Guild", "GUILD"} }
+                    for _, ch in ipairs(channels) do
+                        rootDescription:CreateButton(ch[1], function()
+                            addon:ReportMeter(ch[2])
+                        end)
+                    end
+                end)
+            end
+        end
+    end)
+end
+
+function S.ApplySessionHighlight(win, db)
+    if win.sessionId then
+        win.header.sessText:SetTextColor(1, 0.3, 0.3)
+    else
+        win.header.sessText:SetTextColor(db.headerFontColor.r, db.headerFontColor.g, db.headerFontColor.b)
+    end
+end
+
+function S.ResetDrillBar(bar, db)
+    bar._isDrill = nil
+    bar._drillHasIcon = nil
+    bar.pctText:Hide()
+    bar.rightText:ClearAllPoints()
+    bar.rightText:SetPoint("RIGHT", -4, 0)
+    local style = db.classIconStyle or 'fabled'
+    if style == 'fabled' or not style then
+        bar.classIcon:SetTexture(S.CLASS_ICONS)
+    end
+    S.ApplyBarIconLayout(bar, db)
+end
+
+function S.ResetWindowState(win)
+    win.scrollOffset = 0
+    win.drillSource  = nil
+    win.sessionId    = nil
+    win.sessionType  = Enum.DamageMeterSessionType.Current
+end