TWW - Redo scrolls with WoWScrollBoxList

[mbattersby]

Inherit from WoWScrollBox list also add an EventFrame scrollbar.

    local view = CreateScrollBoxListLinearView()
    view:SetElementInitializer("ListEntryButtonTemplate", ButtonInitFunction)
    ScrollUtil.InitScrollBoxListWithScrollBar(ScrollBox, ScrollBar, view)

    local dataProvider = CreateDataProvider(listOfElements)
    scrollBox:SetDataProvider(dataProvider, ScrollBoxConstants.RetainScrollPosition)

This would also make it possible to support Drag re-ordering. Below is half an implementation.

    local function LineFactory(elementData)
        return "ScrollBoxDragLineTemplate"
    end

    local function AnchoringHandler(anchorFrame, candidateFrame, candidateArea)
        if candidateArea == DragIntersectionArea.Above then
            anchorFrame:SetPoint("BOTTOMLEFT", candidateFrame, "TOPLEFT", 0, 0)
            anchorFrame:SetPoint("BOTTOMRIGHT", candidateFrame, "TOPRIGHT", 0, 0)
        elseif candidateArea == DragIntersectionArea.Below then
            anchorFrame:SetPoint("TOPLEFT", candidateFrame, "BOTTOMLEFT", 0, 0)
            anchorFrame:SetPoint("TOPRIGHT", candidateFrame, "BOTTOMRIGHT", 0, 0)
        end
    end

    -- This inits the object that the cursor drags around representing the source button
    local function Initializer(button, sourceButton)
       -- want to call the original button initializer but disable all the interactivity
    end

   -- This creates the object that the cursor drags around representing the source button
    local function CursorFactory(elementData)
        return "PandaGemEntryTemplate", Initializer
    end

    local dragBehavior = ScrollUtil.AddLinearDragBehavior(ScrollBox, CursorFactory, LineFactory, AnchoringHandler)
    dragBehavior:SetReorderable(true)
    dragBehavior:SetDragRelativeToCursor(true)

    dragBehavior:SetNotifyDragSource(
        function (sourceFrame, drag)
            sourceFrame:SetAlpha(drag and .5 or 1)
            sourceFrame:DesaturateHierarchy(drag and 1 or 0)
            sourceFrame:SetMouseMotionEnabled(not drag)
        end)

    dragBehavior:SetNotifyDragCandidates(
        function (candidateFrame, drag)
            candidateFrame:SetMouseMotionEnabled(not drag)
        end)

    dragBehavior:SetSourceDragCondition(
        function (sourceFrame, sourceElementData)
            return true
        end)

[mbattersby]

Hol up, check if this works in Classic.