function.lua

function ZO_SharedInventoryManager:CreateOrUpdateSlotData(existingSlotData, bagId, slotIndex, isNewItem)
    local icon, stackCount, sellPrice, meetsUsageRequirement, locked, equipType, _, functionalQuality, displayQuality = GetItemInfo(bagId, slotIndex)
    local launderPrice = GetItemLaunderPrice(bagId, slotIndex)

    local hadItemInSlotBefore = false
    local wasSameItemInSlotBefore = false
    local hasItemInSlotNow = stackCount > 0
    local newUniqueId = hasItemInSlotNow and GetItemUniqueId(bagId, slotIndex) or nil

    local slot = existingSlotData

    if not slot then
        if hasItemInSlotNow then
            slot = {}
        end
    else
        hadItemInSlotBefore = slot.stackCount > 0
        wasSameItemInSlotBefore = hadItemInSlotBefore and hasItemInSlotNow and slot.uniqueId == newUniqueId
    end

    if not hasItemInSlotNow then
        if hadItemInSlotBefore then
            return nil, SHARED_INVENTORY_SLOT_RESULT_REMOVED
        end
        return nil, SHARED_INVENTORY_SLOT_RESULT_NO_CHANGE
    end

    local rawNameBefore = slot.rawName
    slot.rawName = GetItemName(bagId, slotIndex)
    if rawNameBefore ~= slot.rawName then
        slot.name = zo_strformat(SI_TOOLTIP_ITEM_NAME, slot.rawName)
    end
    slot.requiredLevel = GetItemRequiredLevel(bagId, slotIndex)
    slot.requiredChampionPoints = GetItemRequiredChampionPoints(bagId, slotIndex)

    if not wasSameItemInSlotBefore then
        slot.itemType, slot.specializedItemType = GetItemType(bagId, slotIndex)
        slot.uniqueId = GetItemUniqueId(bagId, slotIndex)
    end

    slot.iconFile = icon
    slot.stackCount = stackCount
    slot.sellPrice = sellPrice
    slot.launderPrice = launderPrice
    slot.stackSellPrice = stackCount * sellPrice
    slot.stackLaunderPrice = stackCount * launderPrice
    slot.bagId = bagId
    slot.slotIndex = slotIndex
    -- Items flagged equipped unique can only have one equipped, which means once they are
    -- equipped they are no longer equippable, but we don't want to color these items red
    -- in GamepadInventory once they are equipped, because that doesn't make any sense.
    slot.meetsUsageRequirement = meetsUsageRequirement or (bagId == BAG_WORN)
    slot.locked = locked
    slot.functionalQuality = functionalQuality
    slot.displayQuality = displayQuality
    -- slot.quality is deprecated, included here for addon backwards compatibility
    slot.quality = displayQuality
    slot.equipType = equipType
    slot.isPlayerLocked = IsItemPlayerLocked(bagId, slotIndex)
    slot.isBoPTradeable = IsItemBoPAndTradeable(bagId, slotIndex)
    slot.isJunk = IsItemJunk(bagId, slotIndex)
    slot.statValue = GetItemStatValue(bagId, slotIndex) or 0
    slot.itemInstanceId = GetItemInstanceId(bagId, slotIndex) or nil
    slot.brandNew = isNewItem
    slot.stolen = IsItemStolen(bagId, slotIndex)
    slot.filterData = { GetItemFilterTypeInfo(bagId, slotIndex) }
    slot.condition = GetItemCondition(bagId, slotIndex)
    slot.isPlaceableFurniture = IsItemPlaceableFurniture(bagId, slotIndex)
    slot.traitInformation = GetItemTraitInformation(bagId, slotIndex)
    slot.traitInformationSortOrder = ZO_GetItemTraitInformation_SortOrder(slot.traitInformation)
    slot.sellInformation = GetItemSellInformation(bagId, slotIndex)
    slot.sellInformationSortOrder = ZO_GetItemSellInformationCustomSortOrder(slot.sellInformation)
    slot.actorCategory = GetItemActorCategory(bagId, slotIndex)
    --Don't bother checking for guild bank or buyback because we don't care in those cases
    --In the case of the craft bag or companion worn bag, it isn't possible for a build item to live there, so we can just immediately infer false
    if bagId == BAG_GUILDBANK or bagId == BAG_BUYBACK or bagId == BAG_VIRTUAL or bagId == BAG_COMPANION_WORN then
        slot.isInArmory = false
    else
        slot.isInArmory = IsItemInArmory(bagId, slotIndex)
    end

    local isFromCrownCrate = IsItemFromCrownCrate(bagId, slotIndex)
    slot.isGemmable = false
    slot.requiredPerGemConversion = nil
    slot.gemsAwardedPerConversion = nil
    if isFromCrownCrate then
        local requiredPerGemConversion, gemsAwardedPerConversion = GetNumCrownGemsFromItemManualGemification(bagId, slotIndex)
        if requiredPerGemConversion > 0 and gemsAwardedPerConversion > 0 then
            slot.requiredPerGemConversion = requiredPerGemConversion
            slot.gemsAwardedPerConversion = gemsAwardedPerConversion
            slot.isGemmable = true
        end
    end

    slot.isFromCrownStore = IsItemFromCrownStore(bagId, slotIndex)

    if wasSameItemInSlotBefore and slot.age ~= 0 then
        -- don't modify the age, keep it the same relative sort - for now?
        -- Age is only set to 0 before this point from ClearNewStatus, so if brandNew is false
        -- but age isn't 0, something has tried to set brandNew to false without calling ClearNewStatus,
        -- so we can still rely on it actually being new.
        slot.brandNew = true
    elseif isNewItem then
        slot.age = GetFrameTimeSeconds()
    else
        slot.age = 0
    end

    self:RefreshStatusSortOrder(slot)

    if hadItemInSlotBefore then
        if isNewItem then
            return slot, SHARED_INVENTORY_SLOT_RESULT_REMOVE_AND_ADD
        else
            return slot, SHARED_INVENTORY_SLOT_RESULT_UPDATED
        end
    end

    return slot, SHARED_INVENTORY_SLOT_RESULT_ADDED
end