Bagshui/Components/Inventory.Layout.lua

-- Bagshui Inventory Prototype: Window Layout
-- Categorizing, Sorting, Putting Things On The Screen, etc.
-- Most of the functions here shouldn't be called directly as Inventory:Update() handles the coordination.

Bagshui:AddComponent(function()
  local Inventory = Bagshui.prototypes.Inventory

  -- When deciding whether there are differences between a dry run and current state,
  -- some tables need to be compared deeper than the default of 1 level. Set those here.
  local LAYOUT_LOOKUP_TABLE_COMPARE_DEPTH = {
    categoryIdsGroupedBySequence = 2,
    groupItems = 2,
  }

  -- Reusable variable for use in `Inventory:Update()`.
  local update_cascadeInventory

  --- This is the main workhorse for orchestrating UI changes; it's called when almost anything happens.
  ---@param cascade boolean? After completing the update process for this inventory, trigger it for any docked inventory.
  function Inventory:Update(cascade)
    -- self:PrintDebug(string.format("Update() windowUpdateBlocked=%s", tostring(self.windowUpdateBlocked)))

    -- Only update if we haven't been blocked from doing so.
    -- One of the main reasons this can happen is when the window is being dragged --
    -- see `Inventory:SaveWindowPosition()` for details.
    if self.windowUpdateBlocked then
      return
    end

    -- Don't redraw while the window is being dragged. A full redraw (for example from a BAG_UPDATE
    -- while looting in combat) resizes and re-lays out every button of a frame that is moving,
    -- which shows up as a hitch. The update runs as soon as the window is dropped.
    if self:IsDragInProgress() then
      self.updateDeferredByDrag = true
      self.updateDeferredByDragCascade = self.updateDeferredByDragCascade or cascade
      return
    end

    -- Update is only needed if the window is visible.
    if not self:Visible() and not self.forceCacheUpdate then
      self.windowUpdateBlocked = false
      return
    end

    -- Decide whether we'll need to cascade, and pass everything along.
    update_cascadeInventory = cascade and (self.dockedInventory or self.dockedToInventory)
    if update_cascadeInventory then
      update_cascadeInventory.forceCacheUpdate = update_cascadeInventory.forceCacheUpdate or self.forceCacheUpdate
      update_cascadeInventory.forceResort = update_cascadeInventory.forceResort or self.forceResort
      update_cascadeInventory.windowUpdateNeeded = update_cascadeInventory.windowUpdateNeeded or self.windowUpdateNeeded
    end

    -- Reset per-update transient flags before running the pipeline.
    self.cacheChanged = false
    self.cacheNeedsCategorize = false
    self.lookupTablesWereRebuilt = false
    -- We're updating!
    self.windowUpdateBlocked = true

    -- Before doing anything else, we need to know if we're online.
    self:UpdateOnlineStatus()

    -- Always update the cache if we get this far.
    self:UpdateCache()

    -- self.forceCacheUpdate was true, but the window might not be visible.
    if not self:Visible() then
      -- No need to redraw everything when we're not visible.
      self.windowUpdateBlocked = false
      return
    end

    -- Nothing changed and nothing is waiting for a redraw -- skip the entire pipeline.
    -- This is the primary optimization for spurious BAG_UPDATE events.
    if not self.cacheChanged and not self.windowUpdateNeeded and not self.forceResort and not self.lookupTablesStale then
      self.windowUpdateBlocked = false
      if update_cascadeInventory then
        update_cascadeInventory:Update()
      end
      return
    end

    -- Perform all updates in the necessary order.
    self:ValidateLayout()
    -- Capture resort signals before ManageDryRun(true) clears forceResort.
    local needsCategorizeAndSort = self.forceResort or self.resortNeeded
    self:ManageDryRun(true) -- First call decides whether we're in dry run mode (`self.dryRun`).
    self:UpdateLayoutLookupTables()
    if self.cacheNeedsCategorize or self.lookupTablesWereRebuilt or needsCategorizeAndSort then
      self:CategorizeAndSort()
    end
    self:ManageDryRun(false) -- Second call re-points lookup tables if needed and sets `self.enableResortIcon`.
    -- If the dry run shows the layout is identical to last render, the window
    -- update request came only from CategorizeAndSort, and no cache items actually
    -- changed, skip the full redraw. The cache-changed guard is essential: both
    -- proposedLayoutState and currentLayoutState hold the same live pointers into
    -- self.inventory, so ObjectsEqual() always reports them as identical after
    -- UpdateCache() writes new data in place -- even when item A replaced item B
    -- in the same slot. Without the guard the texture would not update.
    -- UpdateWindow() still runs its lightweight path (colors, border, strata).
    if self.dryRun and not self.enableResortIcon and self.windowUpdateNeededByCategorize and not self.cacheChanged then
      self.windowUpdateNeeded = false
    end
    self.windowUpdateNeededByCategorize = false
    -- Always refresh item button visual state when the window is visible and
    -- the full layout rebuild is being skipped (keeps search and highlights current).
    if not self.windowUpdateNeeded and self:Visible() then
      self:UpdateItemSlotColors()
    end
    self:FindSpecialItems()
    self:UpdateWindow()
    self:UpdateBagBar()
    self:UpdateToolbar()

    -- Reset status.
    self.windowUpdateBlocked = false

    -- Automatically cascade updates to docked inventory.
    if update_cascadeInventory then
      update_cascadeInventory:Update()
    end
  end

  --- Force a window redraw with optional cache update.
  ---@param cascade boolean? Parameter for `Inventory:Update()`.
  ---@param updateCache boolean? `true` to trigger a cache update.
  function Inventory:ForceUpdateWindow(cascade, updateCache)
    self.cacheUpdateNeeded = updateCache or false
    self.windowUpdateNeeded = true
    self.forceResort = false
    self:Update(cascade)
  end

  --- Refresh only item slot colors without all the overhead of calculating the window layout.
  --- High-performance -- much better than `UpdateWindow()`/`ForceUpdateWindow()`, so it should be used for
  --- changing highlights or opacity (searching, bag bar mouseover, Edit Mode highlighting, etc.).
  function Inventory:UpdateItemSlotColors()
    for _, button in ipairs(self.ui.buttons.itemSlots) do
      if button:IsVisible() then
        self.ui:UpdateItemButtonColorsAndBadges(button)
      end
    end
  end

  --- Refresh cooldown animations on all visible item slot buttons without rebuilding the window layout.
  --- Called in response to BAG_UPDATE_COOLDOWN so cooldown timers appear immediately after item use.
  function Inventory:UpdateItemSlotCooldowns()
    local cooldownStart, cooldownDuration, isOnCooldown
    for _, button in ipairs(self.ui.buttons.itemSlots) do
      if button:IsVisible() and button.bagshuiData.item then
        cooldownStart = 0
        cooldownDuration = 0
        isOnCooldown = nil
        if button.bagshuiData.item.itemString ~= nil then
          cooldownStart, cooldownDuration, isOnCooldown =
            _G.GetContainerItemCooldown(button.bagshuiData.bagNum, button.bagshuiData.slotNum)
        end
        _G.CooldownFrame_SetTimer(
          button.bagshuiData.buttonComponents.cooldown,
          cooldownStart,
          cooldownDuration,
          isOnCooldown
        )
      end
    end
  end

  --- Ensure there will be no errors when using the active layout.
  function Inventory:ValidateLayout()
    -- Completely empty layouts need at least a row and a group.
    if table.getn(self.layout) == 0 then
      table.insert(self.layout, {})
      BsUtil.TableCopy(BS_NEW_PROFILE_TEMPLATE.structure.primary.layout, self.layout)
    end

    -- Validate categories assigned to the layout.
    for row = 1, table.getn(self.layout) do
      for group = 1, table.getn(self.layout[row]) do
        local groupCategories = self.layout[row][group].categories
        if groupCategories then
          -- Remove invalid categories.
          -- Need to step backwards so we can use table.remove().
          for catNum = table.getn(groupCategories), 1, -1 do
            local categoryId = groupCategories[catNum]
            if not BsCategories.list[categoryId] then
              table.remove(groupCategories, catNum)
            end
          end
        else
          -- This group needs a categories property.
          self.layout[row][group].categories = {}
        end
      end
    end
  end

  --- Control whether the current layout update is a dry run or not.
  --- **Should not be called directly!** Use `Inventory:Update()` to coordinate the process.
  ---
  --- Doing a dry run means storing information in the `proposedLayoutState` tables
  --- instead of `currentLayoutState`. The proposed state can then be compared
  --- to current to decide whether resorting is needed.
  ---
  --- This must be called twice during the `Update()` process - once prior to categorizing/sorting
  --- with a parameter of `true` and again just after with `false` (or nil) before calling `UpdateWindow()`.
  ---@param phase1 boolean? Pass `true` the first time the function is called.
  function Inventory:ManageDryRun(phase1)
    if phase1 then
      -- Determine whether this is real or if we're just simulating to decide whether there are changes.
      self.dryRun = false
      -- Ensure items don't shift around when the window is open under normal usage.
      -- self.forceResort can be used to override (usually when the user clicks the Resort button).
      if (not self.resortNeeded or self:Visible()) and not self.forceResort then
        self.dryRun = true
        -- 	self:PrintDebug("++++DRY RUN ON++++")
        -- else
        -- 	self:PrintDebug("----dry run off----")
      end

      -- Reset force resort flag.
      self.forceResort = false

      -- Point layout state tracking keys to the correct tables.
      for key, _ in pairs(self.currentLayoutState) do
        self[key] = self[self.dryRun and "proposedLayoutState" or "currentLayoutState"][key]
      end
    else
      -- Resetting tables to current if needed.
      -- Decide whether the resort icon needs to be enabled.
      self.enableResortIcon = false
      -- Special stuff for dry run mode:
      -- - Manage the resort icon.
      -- - Re-point layout state tables.
      if
        self.dryRun
        -- Safety check to ensure pointers are always reset.
        or self.groups ~= self.currentLayoutState.groups
      then
        -- We can immediately know to enable resorting if any empty slot is peeled off its stack.
        self.enableResortIcon = (self.emptySlotStackingAllowed and self.hasSlotsWithStackingPrevented)

        for key, _ in pairs(self.currentLayoutState) do
          if
            self.dryRun
            and not self.enableResortIcon -- No need to keep checking once we've hit true.
            and not BsUtil.ObjectsEqual(
              self.proposedLayoutState[key],
              self.currentLayoutState[key],
              nil,
              nil,
              LAYOUT_LOOKUP_TABLE_COMPARE_DEPTH[key] or 1
            )
          then
            self.enableResortIcon = true
          end

          -- Always swap back to the "current" layout state for UpdateWindow() instead
          -- of the dry run one so that nothing moves around undesirably.
          self[key] = self.currentLayoutState[key]
        end
      end
    end
  end

  --- Assign inventory items to Bagshui categories and sort into the correct order for display.
  --- **Should not be called directly!** Use `Inventory:Update()` to coordinate the process.
  ---
  --- Inventory cache to lookup table relationships:
  --- - Cache is stored as `self.inventory[bagNum][slotNum]`
  --- - Group items store references to the inventory cache items:
  ---     `self.groupItems[groupNum][position] = <reference to self.inventory[bagNum][slotNum]>`
  function Inventory:CategorizeAndSort()
    --self:PrintDebug("CategorizeAndSort()")

    -- Categorize items and assign to groups.
    self:CategorizeItems()

    -- Sort items within groups.
    self:SortGroups()

    -- Reset flags.
    self.resortNeeded = false
    self.windowUpdateNeeded = true
    self.windowUpdateNeededByCategorize = true
  end

  --- Fill the lookup tables that are used when building the interface.
  --- ***Generally* should not be called directly!** Use `Inventory:Update()` to coordinate the process.
  ---
  --- Lookup tables managed by this function:
  --- - `activeGroups`: `{ <Group ID> = <Reference to group> }`
  --- - `categoryIdsGroupedBySequence` is used to determine the order of execution for category matching:
  --- ```
  --- 	{
  --- 		[<Sequence Num 1>] = {
  --- 			[<Category ID 1>],
  --- 			[<Category ID 2>],
  --- 		},
  --- 		[<Sequence Num 2>] = {
  --- 			[<Category ID 3>],
  --- 		},
  --- 	}
  --- ```
  --- - `sortedCategorySequenceNumbers` is just an array of the sequence numbers from `categoryIdsGroupedBySequence`
  --- so that it can easily be sorted. This avoids having to resort the sequence numbers in `categoryIdsGroupedBySequence`
  --- on every call to `Categories:Categorize()`.
  --- - `categoriesToGroups` is exactly what it sounds like - the mapping of category IDs to group IDs (which are simply row:position)
  --- and is used by `CategorizeAndSort()` when filling the groupItems table.
  function Inventory:UpdateLayoutLookupTables()
    --self:PrintDebug("UpdateLayoutLookupTables()")
    -- self:PrintDebug(BsCategories.list)

    -- Only rebuild when the layout structure has actually changed.
    -- Also rebuild if the current tables are unpopulated: ManageDryRun() can switch self.groups
    -- (and the other layout-state tables) to the proposedLayoutState copies, which start empty
    -- and won't have been filled yet if this is the first dry-run pass since the last rebuild.
    if not self.lookupTablesStale and next(self.groups) ~= nil then
      return
    end
    self.lookupTablesWereRebuilt = true

    -- This will be used at the end if defaultCategoryFound is still false.
    local lastGroupId = ""
    local defaultCategoryFound = false

    -- Wipe all the lookup tables managed by this function.
    BsUtil.TableClear(self.activeCategoryIds)
    BsUtil.TableClear(self.activeGroups)
    BsUtil.TableClear(self.categoriesToGroups)
    BsUtil.TableClear(self.categorySequenceNumbers)
    BsUtil.TableClear(self.groups)
    BsUtil.TableClear(self.sortedCategorySequenceNumbers)
    -- Don't remove unused sequence number tables - no need to upset the garbage collector.
    -- (This could be slightly more efficient with something like Compost, but it's not a huge deal.)
    for _, categoryIds in pairs(self.categoryIdsGroupedBySequence) do
      BsUtil.TableClear(categoryIds)
    end

    -- Process the layout and update lookup tables.
    for rowNum, rowGroups in ipairs(self.layout) do
      for groupNum, groupDetails in ipairs(rowGroups) do
        local groupId = rowNum .. ":" .. groupNum
        lastGroupId = groupId

        -- Store reference to the group for easy access later.
        self.groups[groupId] = groupDetails

        -- Store the group ID on the group so it's easily accessible for use by Update()
        groupDetails.groupId = groupId

        -- Groups aren't technically active unless they have categories assigned and at least one category is valid.
        if groupDetails.categories and table.getn(groupDetails.categories) > 0 then
          for _, categoryId in ipairs(groupDetails.categories) do
            self:AddCategoryToLookupTables(categoryId, groupId)

            if categoryId == BsCategories.defaultCategory then
              defaultCategoryFound = true
            end
          end
        end
      end
    end

    -- Ensure the default category is always assigned to a group. This is a failsafe and really shouldn't ever be reached.
    if not defaultCategoryFound then
      self:PrintDebug("WARNING: no default category found!")
      self:AddCategoryToLookupTables(BsCategories.defaultCategory, lastGroupId)
    end

    -- Order sortedCategorySequenceNumbers by category sequence.
    table.sort(self.sortedCategorySequenceNumbers)

    self.lookupTablesStale = false
  end

  --- Helper function to add a category to the lookup tables.
  ---@param categoryId string ID of the category.
  ---@param groupId string ID of the group to associate with the category.
  function Inventory:AddCategoryToLookupTables(categoryId, groupId)
    -- Ensure this is a valid category.
    -- Shouldn't ever really be an issue because ValidateLayout() is called first, but let's be safe.
    if BsCategories.list[categoryId] then
      -- Get info about the category.
      local categoryDetails = BsCategories.list[categoryId]

      -- This is an active category (used when checking for errors).
      self.activeCategoryIds[categoryId] = true

      -- We haven't seen this sequence number yet.
      if self.categoryIdsGroupedBySequence[categoryDetails.sequence] == nil then
        self.categoryIdsGroupedBySequence[categoryDetails.sequence] = {}
      end

      -- Add sequence number to sortedCategorySequenceNumbers so it can be used during categorization.
      if not self.categorySequenceNumbers[categoryDetails.sequence] then
        self.categorySequenceNumbers[categoryDetails.sequence] = true
        table.insert(self.sortedCategorySequenceNumbers, categoryDetails.sequence)
      end

      -- Create the category-to-group relationship in categoryIdsGroupedBySequence[<sequence>][<categoryId].
      self.categoryIdsGroupedBySequence[categoryDetails.sequence][categoryId] = groupId

      -- Add to the flat category-to-group relationship table.
      self.categoriesToGroups[categoryId] = groupId

      -- This is a an active group.
      self.activeGroups[groupId] = self.groups[groupId]
    end
  end

  --- Assign categories and groups to all items in the inventory cache.
  --- **Should not be called directly!** Use `Inventory:Update()` to coordinate the process.
  ---
  --- Lookup tables managed by this function:
  --- - `groupItems` stores the sorted list of items that belong to each group.
  ---
  --- Also updates each item's `bagshuiGroupId` and `bagshuiCategoryId` properties.
  function Inventory:CategorizeItems()
    -- groupItems stores the list of items that belongs to each group.
    -- Start clean each time we categorize and sort.

    -- groupItems is a table of tables, so only wipe the 2nd level tables to keep the garbage collector happy.
    for groupId, _ in pairs(self.groupItems) do
      BsUtil.TableClear(self.groupItems[groupId])
    end
    -- Using groups instead of activeGroups here just to ensure every possibility is initialized.
    for groupId, _ in pairs(self.groups) do
      if not self.groupItems[groupId] then
        self.groupItems[groupId] = {}
      end
    end

    local defaultGroupId = self.categoriesToGroups[BsCategories.defaultCategory]
    local groupId

    -- Perform the actual categorization.
    for _, bagNum in ipairs(self.containerIds) do
      -- Only process bags that have contents.
      if self.containers[bagNum].numSlots > 0 and table.getn(self.inventory[bagNum]) > 0 then
        -- Process all bag slots.
        local bagNumSlots = self.containers[bagNum].numSlots
        if bagNumSlots > 0 then
          for slotNum = 1, bagNumSlots do
            -- Categorize each item.
            -- This must ALWAYS be performed so new items don't show up with an unknown category in the Bagshui tooltip.
            BsCategories:Categorize(
              self.inventory[bagNum][slotNum],
              nil, -- Categorization as any alternate character is not currently enabled.
              self.sortedCategorySequenceNumbers,
              self.categoryIdsGroupedBySequence
            )

            -- Fall back to the default group if one wasn't assigned.
            groupId = self.inventory[bagNum][slotNum].bagshuiGroupId
            if string.len(tostring(groupId or "")) == 0 then
              groupId = defaultGroupId
            end

            -- Empty slots are now allowed to stack since they've been through the categorizing process.
            -- (When an empty slot is first seen during a cache update, it gets the _bagshuiPreventEmptySlotStack
            -- property set so that empty slots don't just "disappear" into a stack when the window is open
            -- and the user moves an item out of a slot.)
            if not self.dryRun and self.inventory[bagNum][slotNum].emptySlot == 1 then
              self.inventory[bagNum][slotNum]._bagshuiPreventEmptySlotStack = nil
            end

            -- Final safety check to ensure we don't somehow try to assign to a group that doesn't exist.
            if not self.groupItems[groupId] then
              groupId = defaultGroupId
            end

            -- Add to group positions lookup table.
            table.insert(self.groupItems[groupId], self.inventory[bagNum][slotNum])
          end -- bagNumSlots loop
        end -- bagNumSlots > 0
      end -- Known bag check
    end -- self.containerIds loop

    -- Show the error button if there were problems.
    self.errorText = BsCategories:GetErrors(self.activeCategoryIds)
  end

  -- Sort each group's items in the configured order.
  -- **Should not be called directly!** Use `Inventory:Update()` to coordinate the process.
  function Inventory:SortGroups()
    for groupId, groupConfig in pairs(self.activeGroups) do
      BsSortOrders:SortGroup(self.groupItems[groupId], groupConfig, self.settings.defaultSortOrder)
    end
  end

  --- Return approximate dimensions for a row of groups using the same slot/group math as UpdateWindow().
  ---@param rowGroups table[] Layout groups to measure.
  ---@param maxColumns number Maximum item columns allowed in the row.
  ---@param adjustedItemSlotSize number Scaled item slot size.
  ---@param itemSlotMargin number Space around item slots.
  ---@param groupPadding number Group padding.
  ---@return number actualWidth
  ---@return number actualHeight
  ---@return number visibleGroupCount
  ---@return number rowWidthInItems
  function Inventory:GetLayoutRowDimensions(rowGroups, maxColumns, adjustedItemSlotSize, itemSlotMargin, groupPadding)
    local numGroupsInRow = table.getn(rowGroups)
    local totalItemsInRow = 0
    local rowWidthInItems = 0
    local rowHeightInItems = 1
    local unshrinkableGroupCount = 0
    local groupWidthsInItems = {}
    local groupId

    for columnNum = 1, numGroupsInRow do
      groupId = rowGroups[columnNum].groupId
      groupWidthsInItems[groupId] = self.groupItemCounts[groupId] or 0
      totalItemsInRow = totalItemsInRow + groupWidthsInItems[groupId]
    end

    rowWidthInItems = totalItemsInRow

    while rowWidthInItems > maxColumns do
      rowHeightInItems = rowHeightInItems + 1
      repeat
        rowWidthInItems = 0
        unshrinkableGroupCount = 0
        for columnNum = 1, numGroupsInRow do
          groupId = rowGroups[columnNum].groupId

          if groupWidthsInItems[groupId] > 1 then
            local newWidth = groupWidthsInItems[groupId] - 1
            if self.groupItemCounts[groupId] / newWidth <= rowHeightInItems then
              groupWidthsInItems[groupId] = newWidth
            else
              unshrinkableGroupCount = unshrinkableGroupCount + 1
            end
          else
            unshrinkableGroupCount = unshrinkableGroupCount + 1
          end
          rowWidthInItems = rowWidthInItems + groupWidthsInItems[groupId]
        end
      until rowWidthInItems <= maxColumns or unshrinkableGroupCount >= numGroupsInRow

      -- If every group is already at its minimum width, this row can't fit within
      -- maxColumns. Stop measuring instead of looping forever.
      if rowWidthInItems > maxColumns then
        local canShrink = false
        for columnNum = 1, numGroupsInRow do
          if groupWidthsInItems[rowGroups[columnNum].groupId] > 1 then
            canShrink = true
            break
          end
        end
        if not canShrink then
          break
        end
      end
    end

    local actualWidth = 0
    local visibleGroupCount = 0
    for columnNum = 1, numGroupsInRow do
      groupId = rowGroups[columnNum].groupId
      if groupWidthsInItems[groupId] > 0 then
        actualWidth = actualWidth
          + (groupWidthsInItems[groupId] * (adjustedItemSlotSize + itemSlotMargin))
          + itemSlotMargin
          + (groupPadding * 2)
        visibleGroupCount = visibleGroupCount + 1
      end
    end

    if totalItemsInRow == 0 then
      return 0, 0, visibleGroupCount, rowWidthInItems
    end

    return
      actualWidth,
      (rowHeightInItems * (adjustedItemSlotSize + itemSlotMargin)) + itemSlotMargin + (groupPadding * 2),
      visibleGroupCount,
      rowWidthInItems
  end

  --- Build a temporary layout for rendering visible groups in a smaller footprint.
  --- Does not mutate the saved Structure profile layout.
  ---@param maxColumns number Maximum item columns allowed by the window setting.
  ---@param adjustedItemSlotSize number Scaled item slot size.
  ---@param itemSlotMargin number Space around item slots.
  ---@param groupPadding number Group padding.
  ---@param groupXSpacing number Horizontal space between groups.
  ---@param groupYSpacing number Vertical space between groups.
  ---@return table renderLayout Temporary layout table.
  function Inventory:BuildAutoCompactRenderLayout(
    maxColumns,
    adjustedItemSlotSize,
    itemSlotMargin,
    groupPadding,
    groupXSpacing,
    groupYSpacing
  )
    local visibleGroups = {}
    local hideGroup
    local groupId

    for rowNum = 1, table.getn(self.layout) do
      for columnNum = 1, table.getn(self.layout[rowNum]) do
        groupId = self.layout[rowNum][columnNum].groupId
        if groupId then
          hideGroup = false
          if self.groups[groupId] and self.groups[groupId].hide then
            hideGroup = true
            self.hasHiddenGroups = true
          end

          if not self.showHidden and hideGroup then
            self.groupItemCounts[groupId] = self.highlightItemsInContainerLocked
                and self:GetGroupItemCountForLayout(groupId, self.highlightItemsInContainerLocked)
              or 0
          else
            self.groupItemCounts[groupId] = self:GetGroupItemCountForLayout(groupId)
          end

          if self.groupItemCounts[groupId] > 0 then
            table.insert(visibleGroups, {
              groupId = groupId,
              name = self.layout[rowNum][columnNum].name,
              sourceRowNum = rowNum,
              sourceColumnNum = columnNum,
            })
          end
        else
          Bagshui:PrintWarning("Inventory update call should have forced resort!")
        end
      end
    end

    if table.getn(visibleGroups) == 0 then
      return {}
    end

    local bestLayout
    local bestArea
    local bestWidth

    for targetWidth = 1, maxColumns do
      local candidateLayout = {}
      local currentRow = {}

      for groupNum = 1, table.getn(visibleGroups) do
        local trialRow = {}
        for currentRowGroupNum = 1, table.getn(currentRow) do
          table.insert(trialRow, currentRow[currentRowGroupNum])
        end
        table.insert(trialRow, visibleGroups[groupNum])

        local _, _, _, trialRowWidthInItems = self:GetLayoutRowDimensions(
          trialRow,
          targetWidth,
          adjustedItemSlotSize,
          itemSlotMargin,
          groupPadding
        )

        if table.getn(currentRow) > 0 and trialRowWidthInItems > targetWidth then
          table.insert(candidateLayout, currentRow)
          currentRow = {}
        end
        table.insert(currentRow, visibleGroups[groupNum])
      end

      if table.getn(currentRow) > 0 then
        table.insert(candidateLayout, currentRow)
      end

      local candidateWidth = 0
      local candidateHeight = 0
      local visibleRows = 0
      for rowNum = 1, table.getn(candidateLayout) do
        local rowWidth, rowHeight, visibleGroupCount = self:GetLayoutRowDimensions(
          candidateLayout[rowNum],
          maxColumns,
          adjustedItemSlotSize,
          itemSlotMargin,
          groupPadding
        )
        if visibleGroupCount > 0 then
          rowWidth = rowWidth + ((visibleGroupCount - 1) * groupXSpacing)
          if rowWidth > candidateWidth then
            candidateWidth = rowWidth
          end
          candidateHeight = candidateHeight + rowHeight
          visibleRows = visibleRows + 1
        end
      end
      if visibleRows > 1 then
        candidateHeight = candidateHeight + ((visibleRows - 1) * groupYSpacing)
      end

      local candidateArea = candidateWidth * candidateHeight
      if
        not bestArea
        or candidateArea < bestArea
        or (candidateArea == bestArea and candidateWidth < bestWidth)
      then
        bestLayout = candidateLayout
        bestArea = candidateArea
        bestWidth = candidateWidth
      end
    end

    return bestLayout
  end

  --- Actually do the work of updating the UI.
  --- **Should not be called directly!** Use `Inventory:Update()` or `Inventory:ForceWindowUpdate()` to coordinate the process.
  ---
  --- This function handles:
  --- - Sizing and placing groups so everything fits within the allowed number of columns
  --- - Calling `AssignItemsToSlots()` to fill item slot buttons
  --- - Stacking/unstacking empty slots
  --- - Hiding/showing components and setting window colors based on preferences
  --- - Sizing the window
  function Inventory:UpdateWindow()
    -- self:PrintDebug("UpdateWindow()")

    -- Clear the "never online" message once we're online.
    if self.online then
      Bagshui.currentCharacterData[self.inventoryTypeSavedVars].neverOnline = nil
    end

    -- Can only highlight changes if there's something to highlight.
    self.highlightChangesEnabled = (
      self.hasChanges
      or (self.dockedInventory and self.dockedInventory.hasChanges)
      or (self.dockedToInventory and self.dockedToInventory.hasChanges)
    ) or false

    -- Safeguard: Turn off Highlight Changes if there's nothing to highlight.
    if not self.highlightChangesEnabled then
      self.highlightChanges = false
    end

    -- There are a few things that always need to happen even if we're not
    -- doing a full layout update.

    self.windowColor = self.settings.windowBackground
    self.borderColor = self.settings.windowBorder

    if self.settings.windowUseSkinColors and BsSkin.skinBackgroundColor then
      self.windowColor = BsSkin.skinBackgroundColor
    end
    if self.settings.windowUseSkinColors and BsSkin.windowBackdrop then
      self.windowColor = BsSkin.windowColor or { 1, 1, 1, 1 }
    end

    if not self.online then
      self.borderColor = BS_COLOR.RED
    elseif self.settings.windowUseSkinColors and BsSkin.skinBorderColor then
      self.borderColor = BsSkin.skinBorderColor
    elseif self.settings.windowUseSkinColors and BsSkin.windowBackdrop then
      self.borderColor = BsSkin.windowBorderColor or { 1, 1, 1, 1 }
    end

    self.uiFrame:SetBackdropColor(self.windowColor[1], self.windowColor[2], self.windowColor[3], self.windowColor[4])
    self.uiFrame:SetBackdropBorderColor(
      self.borderColor[1],
      self.borderColor[2],
      self.borderColor[3],
      self.borderColor[4]
    )

    self.uiFrame:SetFrameStrata(self.settings.windowStrata)

    -- Update the utilization display setting.
    -- Done here because it's consumed in `UpdateBagBar()` and `UpdateToolbar()`.
    self.alwaysShowUsageSummary = (
      self.settings.bagUsageDisplay == BS_INVENTORY_BAG_USAGE_DISPLAY.ALWAYS
      or (self.settings.bagUsageDisplay == BS_INVENTORY_BAG_USAGE_DISPLAY.SMART and not self.settings.stackEmptySlots)
      or false
    )

    -- Only do the intensive work of redrawing the UI if we have to.
    if self.windowUpdateNeeded then
      BsUtil.TableClear(self.groupsIdsToFrames)

      local uiFrames = self.ui.frames
      local groupFrames = uiFrames.groups
      local uiButtons = self.ui.buttons

      local itemSlotSize = self.settings.itemSize
      local itemSlotScale = self.ui:GetItemButtonScale(self.ui.buttons.itemSlots[1], itemSlotSize)
      local adjustedItemSlotSize = self.ui:GetItemButtonScaledSize(self.ui.buttons.itemSlots[1], itemSlotSize)
      local itemSlotMargin = self.settings.itemMargin + (BsSkin.itemSlotMarginFudge or 0)

      local groupMarginFudged = self.settings.groupMargin + BsSkin.groupMarginFudge
      local groupLabelHeight = groupFrames[1].bagshuiData.text:GetHeight() + math.abs(BsSkin.groupLabelMinPadding)
      local groupPadding = self.settings.groupPadding
        + (BsSkin.groupPaddingFudge or 0)
        + ((BsSkin.itemSlotMarginFudge / 2) * itemSlotScale)

      local maxColumns = self.settings.windowMaxColumns
      -- Edit Mode shows every group, including empty ones, so rows have many more groups than usual.
      -- Squeezing them into the normal limit makes the window absurdly tall, so allow it to be wider.
      if self.editMode and maxColumns < BS_EDIT_MODE_MIN_MAX_COLUMNS then
        maxColumns = BS_EDIT_MODE_MIN_MAX_COLUMNS
      end
      local anchorLeft = self.settings.windowContentAlignment == "LEFT"
      local showGroupLabels = (self.settings.showGroupLabels and not self.settings.hideGroupLabelsOverride)
        or self.editMode

      local firstFrame, widestRowLastFrame, topmostFrame

      -- Window component visibility.
      local showHeader = ((self.settings.showHeader and not self.dockTo) or self.temporarilyShowWindowHeader)
      local showFooter = (
        (self.settings.showFooter and not self.dockTo)
        or self.temporarilyShowWindowFooter
        or self.temporarilyShowBagBar
      )

      -- Reset hidden group and item tracking.
      self.hasHiddenGroups = false -- Updated in this function.
      self.hasHiddenItems = false -- Updated in GetGroupItemCountForLayout().
      self.hasOpenables = false -- Updated in AssignItemsToSlots().
      self.nextOpenableItemBagNum = nil -- Updated in AssignItemsToSlots().
      self.nextOpenableItemSlotNum = nil -- Updated in AssignItemsToSlots().
      self.nextOpenableItemSlotButton = nil -- Updated in AssignItemsToSlots().

      -- Full reset of empty slot stack counts is needed so that the tracking of which
      -- bag they represent is rebuilt.
      self:ResetEmptySlotStackCounts(true)

      -- Is empty slot stacking currently allowed?
      self.emptySlotStackingAllowed = (
        self.settings.stackEmptySlots -- User setting.
        and not self.expandEmptySlotStacks -- Temporary expansion.
        and not self.editMode -- Always expand in Edit Mode.
      )

      -- Used to track row changes so they include group move targets (the normal
      -- rowNum variable is just an iteration over self.layout).
      local uiRowNum = 0

      -- These three rowGroup* variables control which direction we step though
      -- the groups (left-to-right or right-to-left).
      local rowGroupStart, rowGroupEnd, rowGroupStep

      -- Exactly what it says on the tin.
      local numGroupsInRow
      local totalItemsInRow = 0
      local rowWidthInItems = 0
      local rowHeightInItems = 0
      local finalWindowWidth = 0
      local finalWindowHeight = 0
      local hideGroup = false

      -- Used to track which row is actually the widest after the frames are positioned.
      local widestRowLastFrameOutsideX = 0
      local currentRowLastFrameOutsideX

      -- Used during row width calculations to determine the point when we need
      -- to increase the row height again.
      local unshrinkableGroupCount = 0

      -- The uiGroupNum* variables are used to keep track of which group frame(s)
      -- we should be using for each row and the overall progress as we step through the layout.
      local uiGroupNum = 1 -- Need to have a default value here since we use uiGroupNum later to hide unused groups.
      local uiGroupNumStart = 1
      local uiGroupNumEnd

      -- currentItemSlotButtonNum tracks the progress of assigning items to buttons.
      local currentItemSlotButtonNum = 1

      -- Groups can have some weird padding going on because of their edge textures,
      -- so we need to adjust the group spacing so the visual outcome is correct.
      local groupXSpacing = groupMarginFudged

      -- Similarly, the initial position of everything isn't straightforward and
      -- gets affected by Edit Mode.
      local groupEdgeOffset = groupMarginFudged
      -- Increase the space between the bottom edge and the first group when the footer is visible.
      local groupEdgeYOffset = groupMarginFudged - (showFooter and BsSkin.groupMarginFudge or 0)

      -- When group labels are shown, we may need more Y space.
      local groupYSpacing = groupXSpacing
      if showGroupLabels then
        if groupYSpacing < groupLabelHeight then
          groupYSpacing = groupLabelHeight
        end
        groupYSpacing = groupYSpacing + BsSkin.groupLabelYPadding
      end

      -- Don't need to calculate the row (horizontal) group move target width outside Edit Mode.
      local rowGroupMoveTargetWidth = 0

      -- Edit Mode spacing adjustments -- keep things as tight as possible since the window will
      -- almost always grow due to more groups being visible.
      if self.editMode then
        groupXSpacing = -1
        groupYSpacing = groupXSpacing
        groupEdgeOffset = BsSkin.inventoryEditModeMargin
        groupEdgeYOffset = groupEdgeOffset

        -- The horizontal group move target is basically the width of a single group.
        rowGroupMoveTargetWidth = adjustedItemSlotSize
          + (itemSlotMargin * 2)
          + (groupPadding * 2)
          + ((BsSkin.groupMoveTargetThinDimension + BsSkin.groupMoveTargetAnchorOffset) * 2)
      end

      -- Reset group move target count tracking for ShowNextGroupMoveTarget().
      self.groupMoveTargetCount = 0

      -- Column number adjustment for insertion via group move targets.
      -- This is needed so that we get the correct insertion point regardless of
      -- whether we're going from left to right or vice versa.
      local groupMoveTargetLeadingColumnNumAdjustment = 0
      local groupMoveTargetTrailingColumnNumAdjustment = 0

      -- Prepare to use ShowFrameInNextPosition() for groups.
      self:InitFramePositioningTable(
        "UpdateWindow", -- Position tracking table.
        groupXSpacing, -- Frame X spacing.
        groupYSpacing, -- Frame Y spacing.
        uiFrames.main, -- Initial frame to anchor to.
        -groupEdgeOffset,
        groupEdgeYOffset
      )

      -- Reset tracking tables.
      BsUtil.TableClear(self.groupItemCounts) -- How many items are in each group.
      BsUtil.TableClear(self.groupWidthsInItems) -- Group width in items (actual count EXCEPT in Edit Mode, where 0 becomes 1 to force the group to be visible when empty).
      BsUtil.TableClear(self.actualGroupWidths) -- Group width in screen units.

      local renderLayout = self.layout
      if self.settings.autoCompactLayout and not self.editMode then
        renderLayout = self:BuildAutoCompactRenderLayout(
          maxColumns,
          adjustedItemSlotSize,
          itemSlotMargin,
          groupPadding,
          groupXSpacing,
          groupYSpacing
        )
      end

      -- Groups are placed starting at the bottom of the main frame and working upwards.
      -- Since we're starting at the bottom of the window, we need to start at the last row of the layout table.
      for rowNum = table.getn(renderLayout), 1, -1 do
        -- self:PrintDebug("ROW "..rowNum)

        -- Get the number of groups in this row.
        numGroupsInRow = table.getn(renderLayout[rowNum])
        -- Use that information to figure out the number of the end group.
        uiGroupNumEnd = uiGroupNumStart + numGroupsInRow - 1

        -- Determine anchoring.
        if anchorLeft then
          rowGroupStart = 1
          rowGroupEnd = numGroupsInRow
          rowGroupStep = 1
          groupMoveTargetLeadingColumnNumAdjustment = 0
          groupMoveTargetTrailingColumnNumAdjustment = 1
        else
          rowGroupStart = numGroupsInRow
          rowGroupEnd = 1
          rowGroupStep = -1
          groupMoveTargetLeadingColumnNumAdjustment = 1
          groupMoveTargetTrailingColumnNumAdjustment = 0
        end

        -- Populate lists that are used to determine how tall each group needs to
        -- be in order to fit all items within the maximum column count.
        totalItemsInRow = 0
        for columnNum = rowGroupStart, rowGroupEnd, rowGroupStep do
          local groupId = renderLayout[rowNum][columnNum].groupId

          if groupId then
            hideGroup = false

            -- Determine whether this group is visible and update hasHiddenGroups
            -- to control whether the Show/Hide toolbar button is enabled.
            if self.groups[groupId] and self.groups[groupId].hide then
              hideGroup = true
              self.hasHiddenGroups = true
            end

            -- Determine how many items are in each group in this row based on group visibility.
            if not self.editMode and not self.showHidden and hideGroup then
              -- Set the groupItemCounts for this group to 0 if it's not visible unless it contains
              -- items from the bag that has highlight lock set.
              self.groupItemCounts[groupId] = self.highlightItemsInContainerLocked
                  and self:GetGroupItemCountForLayout(groupId, self.highlightItemsInContainerLocked)
                or 0
            else
              self.groupItemCounts[groupId] = self:GetGroupItemCountForLayout(groupId)
            end

            -- Increment total for this row.
            totalItemsInRow = totalItemsInRow + self.groupItemCounts[groupId]

            -- Starting width for all groups is the number of items in the group.
            self.groupWidthsInItems[groupId] = self.groupItemCounts[groupId]

            -- groupWidthsInItems gets fudged for Edit Mode to make all groups visible, even if they're empty.
            if self.groupWidthsInItems[groupId] == 0 and self.editMode then
              self.groupWidthsInItems[groupId] = 1
            end
          else
            Bagshui:PrintWarning("Inventory update call should have forced resort!")
          end
        end

        -- Starting values for row height/width.
        rowWidthInItems = totalItemsInRow
        rowHeightInItems = 1

        -- Shrink group widths until everything fits within the configured column limit. Basically:
        -- 1. Increment the row height by 1.
        -- 2. Loop through all columns and decrease width of each by 1 (so long as that's possible and won't make it too tall).
        -- 3. See if everything fits now. If not, go back to step 2 unless all groups are now too tall, in which case, go back to step 1.
        -- (No need to do any of this unless there are too many items in the row to fit in the configured number of columns.)
        while rowWidthInItems > maxColumns do
          rowHeightInItems = rowHeightInItems + 1
          repeat
            rowWidthInItems = 0
            unshrinkableGroupCount = 0
            for columnNum = rowGroupStart, rowGroupEnd, rowGroupStep do
              local groupId = renderLayout[rowNum][columnNum].groupId

              -- Shrink the group by 1, if possible.
              if self.groupWidthsInItems[groupId] > 1 then
                local newWidth = self.groupWidthsInItems[groupId] - 1
                -- Make sure this width would't make the group too tall for this row height.
                if self.groupItemCounts[groupId] / newWidth <= rowHeightInItems then
                  self.groupWidthsInItems[groupId] = newWidth
                else
                  unshrinkableGroupCount = unshrinkableGroupCount + 1
                end
              else
                unshrinkableGroupCount = unshrinkableGroupCount + 1
              end
              rowWidthInItems = rowWidthInItems + self.groupWidthsInItems[groupId]
            end
          until rowWidthInItems <= maxColumns or unshrinkableGroupCount >= numGroupsInRow

          -- Failsafe for impossible rows: if there are more visible groups than
          -- allowed columns, every group bottoms out at width 1 and can't shrink
          -- any further.
          if rowWidthInItems > maxColumns then
            local canShrink = false
            for columnNum = rowGroupStart, rowGroupEnd, rowGroupStep do
              if self.groupWidthsInItems[renderLayout[rowNum][columnNum].groupId] > 1 then
                canShrink = true
                break
              end
            end
            if not canShrink then
              break
            end
          end
        end

        -- Is there anything to display on this row?
        if totalItemsInRow == 0 and not self.editMode then
          -- All groups are not visible.
          for groupNum = uiGroupNumStart, uiGroupNumEnd do
            -- This check doesn't seem like it should be necessary, but https://github.com/veechs/Bagshui/issues/172
            -- says otherwise.
            if groupFrames[groupNum] then
              groupFrames[groupNum]:Hide()
            end
          end
        else
          -- There are groups to display, so let's continue.
          -- Calculate the actual group widths, which we need to know when we make the group frame visible.
          local totalActualGroupWidths = 0 -- Will be used to determine how wide the window needs to be.
          for columnNum = rowGroupStart, rowGroupEnd, rowGroupStep do
            local group = renderLayout[rowNum][columnNum]

            -- Make sure this group will be displayed before adding it to the totals.
            if self.groupWidthsInItems[group.groupId] > 0 or self.editMode then
              self.actualGroupWidths[group.groupId] = (
                                -- Item slot widths, margin included.
(self.groupWidthsInItems[group.groupId] * (adjustedItemSlotSize + itemSlotMargin))
                -- This accounts for the space on the opposite side of the last item.
                + itemSlotMargin
                -- Left and right group padding.
                + (groupPadding * 2)
              )
              totalActualGroupWidths = totalActualGroupWidths + self.actualGroupWidths[group.groupId]
            else
              self.actualGroupWidths[group.groupId] = 0
            end
          end

          -- Every group on the row gets the same height even if it's not full of items.
          local actualGroupHeight =
            -- Item slot heights, margin included.
            (rowHeightInItems * (adjustedItemSlotSize + itemSlotMargin))
            -- This accounts for the space above the last item.
            + itemSlotMargin
            -- Top and bottom group padding
            + (groupPadding * 2)

          -- Edit Mode accommodations
          if self.editMode then
            -- Group labels move inside in Edit Mode and need to be added to the height.
            actualGroupHeight = actualGroupHeight + groupLabelHeight

            -- Show the between-row group move target below this row.
            uiRowNum = uiRowNum + 1
            self:ShowNextGroupMoveTarget(
              rowGroupMoveTargetWidth,
              BsSkin.groupMoveTargetThinDimension,
              uiRowNum,
              rowNum + 1,
              1,
              BS_INVENTORY_LAYOUT_DIRECTION.ROW
            )
          end

          -- Put the groups in their places.
          uiGroupNum = uiGroupNumStart
          uiRowNum = uiRowNum + 1

          for columnNum = rowGroupStart, rowGroupEnd, rowGroupStep do
            local groupId = renderLayout[rowNum][columnNum].groupId

            -- Ensure the group exists.
            self.ui:CreateGroup(uiGroupNum)
            local group = groupFrames[uiGroupNum]

            -- Store a reference to the group widget so it's easily accessible via group ID.
            -- Primarily used when an item needs to be assigned to a new group in ManagePendingGroupAssignments().
            self.groupsIdsToFrames[groupId] = group

            -- Show leading group move target for this group in Edit Mode.
            if self.editMode then
              self:ShowNextGroupMoveTarget(
                BsSkin.groupMoveTargetThinDimension,
                actualGroupHeight,
                uiRowNum,
                rowNum,
                columnNum + groupMoveTargetLeadingColumnNumAdjustment,
                BS_INVENTORY_LAYOUT_DIRECTION.COLUMN
              )
              -- In Edit Mode, the group move target should be used for height/width calculations.
              if not firstFrame then
                firstFrame = self.positioningTables.UpdateWindow.anchorToFrame
              end
            end

            -- Display the group.
            if self.groupWidthsInItems[groupId] > 0 then
              -- Update info on the UI object.
              group.bagshuiData.groupId = groupId
              group.bagshuiData.rowNum = renderLayout[rowNum][columnNum].sourceRowNum or rowNum
              group.bagshuiData.columnNum = renderLayout[rowNum][columnNum].sourceColumnNum or columnNum

              -- Add the group to the window.
              self:ShowFrameInNextPosition(
                "UpdateWindow",
                uiRowNum,
                group,
                self.actualGroupWidths[groupId],
                actualGroupHeight
              )

              -- This is the group that should be used for height/width calculations.
              if not firstFrame then
                firstFrame = self.positioningTables.UpdateWindow.anchorToFrame
              end

              -- Set background and border colors.
              self.ui:SetGroupColors(group)

              -- Labels.
              if showGroupLabels then
                -- Move to the correct location depending on whether we're in Edit Mode.
                group.bagshuiData.labelFrame:SetHeight(groupLabelHeight)
                group.bagshuiData.labelFrame:ClearAllPoints()
                if self.editMode then
                  group.bagshuiData.labelFrame:SetWidth(
                    self.actualGroupWidths[groupId] - (groupPadding * 2) - itemSlotMargin
                  )
                  group.bagshuiData.labelFrame:SetPoint(
                    "TOPLEFT",
                    group,
                    "TOPLEFT",
                    BsSkin.groupLabelEditModeXOffset,
                    BsSkin.groupLabelEditModeYOffset
                  )
                  group.bagshuiData.labelFrame:EnableMouse(false)
                else
                  group.bagshuiData.labelFrame:SetWidth(
                    self.actualGroupWidths[groupId] + BsSkin.groupLabelRelativeWidth
                  )
                  group.bagshuiData.labelFrame:SetPoint(
                    "BOTTOMLEFT",
                    group,
                    "TOPLEFT",
                    BsSkin.groupLabelXOffset,
                    BsSkin.groupLabelYOffset
                  )
                  group.bagshuiData.labelFrame:EnableMouse(true)
                end

                -- Set text to group name, or a single space if the group name is empty.
                -- The single space is necessary so that the height can be measured properly.
                group.bagshuiData.text:SetText(
                  string.len(renderLayout[rowNum][columnNum].name or "") > 0 and renderLayout[rowNum][columnNum].name
                    or " "
                )

                group.bagshuiData.labelFrame:Show()
              else
                -- Labels are turned off.
                group.bagshuiData.labelFrame:Hide()
              end

              -- Assign items to the group (only if there are items in the group).
              if self.groupItemCounts[groupId] > 0 then
                currentItemSlotButtonNum = self:AssignItemsToSlots(
                  groupId,
                  uiGroupNum,
                  currentItemSlotButtonNum,
                  self.groupWidthsInItems[groupId],
                  groupPadding,
                  itemSlotSize,
                  itemSlotMargin
                )
              end

              -- Give groups mouse input and display group manager buttons in Edit Mode.
              self.ui:SetGroupInteractivityEnabled(group, self.editMode)
            else
              -- Group should not be visible.
              group:Hide()
            end

            uiGroupNum = uiGroupNum + 1
          end

          -- Display the trailing group move target for this row.
          if self.editMode then
            self:ShowNextGroupMoveTarget(
              BsSkin.groupMoveTargetThinDimension,
              actualGroupHeight,
              uiRowNum,
              rowNum,
              rowGroupEnd + groupMoveTargetTrailingColumnNumAdjustment,
              BS_INVENTORY_LAYOUT_DIRECTION.COLUMN
            )
          end

          -- Update the widest row record so we can make the window the correct width.
          currentRowLastFrameOutsideX = (
            anchorLeft and self.positioningTables.UpdateWindow.anchorToFrame:GetRight()
            or self.positioningTables.UpdateWindow.anchorToFrame:GetLeft()
          )
          if
            widestRowLastFrameOutsideX == 0
            or (
              anchorLeft and widestRowLastFrameOutsideX < currentRowLastFrameOutsideX
              or widestRowLastFrameOutsideX > currentRowLastFrameOutsideX
            )
          then
            widestRowLastFrameOutsideX = currentRowLastFrameOutsideX
            widestRowLastFrame = self.positioningTables.UpdateWindow.anchorToFrame
          end
        end

        uiGroupNumStart = uiGroupNumStart + numGroupsInRow
      end

      -- Add the final group move target above the last row.
      if self.editMode then
        uiRowNum = uiRowNum + 1
        self:ShowNextGroupMoveTarget(
          rowGroupMoveTargetWidth,
          BsSkin.groupMoveTargetThinDimension,
          uiRowNum,
          1,
          1,
          BS_INVENTORY_LAYOUT_DIRECTION.ROW
        )
      end

      -- Hide unused item slot buttons, groups, and group move targets.
      local itemSlotButtonCount = table.getn(uiButtons.itemSlots)
      if currentItemSlotButtonNum <= itemSlotButtonCount then
        for buttonNum = currentItemSlotButtonNum, itemSlotButtonCount do
          uiButtons.itemSlots[buttonNum]:Hide()
        end
      end
      for i = uiGroupNum, table.getn(uiFrames.groups) do
        uiFrames.groups[i]:Hide()
      end
      for i = self.groupMoveTargetCount + 1, table.getn(uiFrames.groupMoveTargets) do
        uiFrames.groupMoveTargets[i]:Hide()
      end

      -- The last frame to be placed is always going to be the highest one vertically,
      -- unlike the frame used for horizontal sizing, which is dependent on which row is the widest.
      topmostFrame = self.positioningTables.UpdateWindow.anchorToFrame

      -- Show the "No inventory data" message for when the cache has never been populated.
      if not self.editMode and BsUtil.TrueTableSize(self.inventory) == 0 then
        self.ui.text.noData:Show()
      else
        self.ui.text.noData:Hide()
      end

      -- Calculate what we always know for width and height (header/footer are added next).
      finalWindowWidth =
        -- Inventory content.
        ((firstFrame and widestRowLastFrame) and math.abs(firstFrame:GetRight() - widestRowLastFrame:GetLeft()) or 0)
        -- Outer group margins.
        + groupEdgeOffset * 2
        -- Window padding.
        + BsSkin.inventoryWindowPadding * 2

      finalWindowHeight =
        -- Inventory content.
        ((topmostFrame and firstFrame) and (topmostFrame:GetTop() - firstFrame:GetBottom()) or 0)
        -- Bottom group margin.
        + groupEdgeYOffset
        -- Edit Mode messes with the sizing.
        + (
          self.editMode
            and BsSkin.groupMoveTargetThinDimension
          or (
                        -- Top group margin is the standard one.
groupEdgeOffset
            -- Need some breathing room above the topmost labels.
            + (showGroupLabels and (groupLabelHeight - BsSkin.groupMarginFudge) or 0)
          )
        )
        -- "No data" message
        + (self.ui.text.noData:IsShown() and self.ui.text.noData:GetHeight() or 0)
        -- Window padding.
        + BsSkin.inventoryWindowPadding * 2

      -- Show/hide header/footer (toolbars) and add to window dimensions.
      if showHeader then
        -- Ensure main frame anchor is correct.
        uiFrames.main:SetPoint("TOP", uiFrames.header, "BOTTOM", 0, 0)
        uiFrames.header:Show()
        -- Update window height.
        finalWindowHeight = finalWindowHeight
          + (uiFrames.header:GetHeight())
          + math.abs(BsSkin.inventoryHeaderFooterYAdjustment)
      else
        -- When the header is hidden, the main frame needs to anchor to the UI frame instead.
        uiFrames.main:SetPoint("TOP", self.uiFrame, "TOP", 0, BsSkin.inventoryWindowPadding)
        uiFrames.header:Hide()
      end

      if showFooter then
        -- Ensure main frame anchor is correct.
        uiFrames.main:SetPoint("BOTTOM", uiFrames.footer, "TOP", 0, 0)

        -- Show/hide Bag Bar and mini utilization summary.
        if self.settings.showBagBar or self.temporarilyShowBagBar then
          uiFrames.bagBar:Show()
          self.ui.frames.miniSpaceSummaryBottom:Hide()
        else
          uiFrames.bagBar:Hide()
          if self.alwaysShowUsageSummary then
            self.ui.frames.miniSpaceSummaryBottom:Show()
          end
        end

        -- Remove space summary from top toolbar.
        self.ui.frames.miniSpaceSummaryTop:Hide()

        -- Apply bag bar scaling and opacity.
        local bagBarScale = (itemSlotSize / uiButtons.itemSlots[1].bagshuiData.originalSizeAdjusted)
          * BsSkin.bagBarScale
        uiFrames.bagBar:SetScale(bagBarScale)
        -- Invert scaling for available space display so text is the normal size.
        uiFrames.spaceSummary:SetScale(1 / bagBarScale)
        -- Invert scaling for borders if needed.
        -- If bag bar scaling was reworked to scale the individual buttons, Ui:SetItemButtonSize()
        -- could be used to handle this automatically, but that refactor is not happening now.
        if BsSkin.itemSlotBorderInverseScale then
          for _, bagSlotButton in ipairs(self.ui.buttons.bagSlots) do
            bagSlotButton.bagshuiData.buttonComponents.border:SetScale(1 / bagBarScale)
          end
        end

        -- Determine footer height based on whether the bag bar is visible.
        local footerHeight = math.max(
          (
                        -- Bag bar visible.
self.settings.showBagBar and (uiButtons.itemSlots[1].bagshuiData.originalSizeAdjusted * bagBarScale)
            or 0
          ),
          BsSkin.inventoryHeaderFooterHeight
        )

        uiFrames.footer:SetHeight(footerHeight)
        uiFrames.footer:Show()

        -- Update window height.
        finalWindowHeight = finalWindowHeight + footerHeight + BsSkin.inventoryHeaderFooterYAdjustment
      else
        -- When the footer is hidden, the main frame needs to anchor to the UI frame instead.
        uiFrames.main:SetPoint("BOTTOM", self.uiFrame, "BOTTOM", 0, BsSkin.inventoryWindowPadding)
        uiFrames.footer:Hide()
      end

      -- We can finally size the window frame.
      self.uiFrame:SetWidth(math.max(finalWindowWidth, BsSkin.inventoryWindowMinWidth))
      self.uiFrame:SetHeight(finalWindowHeight)

      -- Set scale and anchor for docked frame.
      if self.dockTo then
        -- Scaling of docked frames is accomplished by scaling the Main frame, then changing the
        -- dimensions of the window frame. This is done instead of just scaling self.uiFrame to keep
        -- the window border looking the same as the frame it's docked to; it looks a little weird if
        -- the border of the docked frame is shrunk.
        local dockedFrameScale = BsSkin.inventoryDockedScale * Bagshui.components[self.dockTo].uiFrame:GetScale()
        self.ui.frames.main:SetScale(dockedFrameScale)
        self.uiFrame:SetWidth(finalWindowWidth * dockedFrameScale)
        self.uiFrame:SetHeight(finalWindowHeight * dockedFrameScale)

        -- Determine how to anchor the docked window based on how the parent window is docked.
        self.uiFrame:ClearAllPoints()
        local anchorY = "BOTTOM"
        local anchorX = "RIGHT"
        local anchorToY = "TOP"
        local anchorToX = "RIGHT"
        local xOffset = 0
        local yOffset = -4

        if Bagshui.components[self.dockTo].settings.windowAnchorXPoint == "LEFT" then
          anchorX = "LEFT"
          anchorToX = "LEFT"
        end

        if Bagshui.components[self.dockTo].settings.windowAnchorYPoint == "TOP" then
          anchorY = "TOP"
          anchorToY = "BOTTOM"
          yOffset = -yOffset
        end

        self.uiFrame:SetPoint(
          anchorY .. anchorX,
          Bagshui.components[self.dockTo].uiFrame,
          anchorToY .. anchorToX,
          xOffset,
          yOffset
        )
      else
        -- Set scale and anchor for non-docked frame.
        self.uiFrame:SetScale(self.settings.windowScale)
        -- Ensure the window stays in the right place as it resizes.
        -- WoW will change the anchor point to TOPLEFT when the frame is dragged, so we need to reset it.
        self:FixWindowPosition()
      end
    end

    -- Check for mouse over state for interact-able elements to ensure tooltips stay current.
    Bagshui:QueueClassCallback(self, self.ItemSlotAndGroupMouseOverCheck)

    -- Reset statuses.
    self.lastExpandEmptySlotStacks = self.expandEmptySlotStacks
    self.windowUpdateNeeded = false
  end

  --- Fill the given UI group frame with the items assigned to the given group.
  ---@param groupId number ID of the group to which items should be assigned.
  ---@param uiGroupNum number Frame in the `self.ui.frames.groups` table to use for display.
  ---@param currentItemSlotButtonNum number Frame in the `self.ui.frames.buttons.itemSlots` table to use next.
  ---@param groupWidthInItems number Count of items to place on each row of the group.
  ---@param groupPadding number Padding between group edge and item slots.
  ---@param itemSlotSize number Height/width of the item slot button.
  ---@param itemSlotMargin number Margin around the outer edge of each item slot button.
  ---@return any currentItemSlotButtonNum Index of the last frame from `self.ui.frames.buttons.itemSlots` that was used.
  function Inventory:AssignItemsToSlots(
    groupId,
    uiGroupNum,
    currentItemSlotButtonNum,
    groupWidthInItems,
    groupPadding,
    itemSlotSize,
    itemSlotMargin
  )
    -- self:PrintDebug(string.format("AssignItemsToSlots() groupId=%s uiGroupNum=%s groupWidthInItems=%s", groupId, uiGroupNum, groupWidthInItems))

    local itemsPlacedInCurrentRow = 0
    local rowNum = 0
    local genericBagType
    local button
    local isEmptySlotStack

    -- We need the real item count here to be able to step through all items.
    -- (Using the count for layout from upstream won't work if empty slot
    -- stacking is on because we can end up missing items).
    local groupItemCount = table.getn(self.groupItems[groupId])

    -- Make sure there are items to assign in this group.
    if groupItemCount > 0 then
      local buttons = self.ui.buttons
      local frames = self.ui.frames

      local groupFrame = frames.groups[uiGroupNum]

      -- Prepare for layout
      local initialOffset = groupPadding + itemSlotMargin
      self:InitFramePositioningTable(
        "AssignItemsToSlots", -- Position tracking table
        itemSlotMargin, -- Frame X spacing
        itemSlotMargin, -- Frame Y spacing
        groupFrame, -- Initial frame to anchor to
        -initialOffset, -- Initial X offset
        initialOffset -- Initial Y offset
      )

      -- Update empty slot stack count for this group.
      if self.emptySlotStackingAllowed then
        self:CountEmptySlots(groupId)
      end

      -- Need to go in reverse because we're building right to left.
      local firstItem = groupItemCount
      local lastItem = 1
      local step = -1
      local item = nil
      local hideItem = false
      local bagIsHidden = false
      for position = firstItem, lastItem, step do
        -- Grab the item info.
        item = self.groupItems[groupId][position]
        genericBagType = self.containers[item.bagNum].genericType

        -- Item hiding and empty slot handling
        hideItem = false
        isEmptySlotStack = false

        -- Items (and empty slots) in bags the user has hidden.
        bagIsHidden = self:IsBagHiddenInLayout(item.bagNum)

        if bagIsHidden then
          hideItem = true
        -- Empty slot stacking.
        elseif
          self.emptySlotStackingAllowed -- Empty slot stacking must be on.
          and item.emptySlot == 1 -- This item must be an empty slot.
          and not item._bagshuiPreventEmptySlotStack -- This slot must not be temporarily blocked from stacking (usually if it just became empty and re-sorting hasn't occurred yet).
        then
          -- We've already shown one empty slot of this type in this group, so hide all the others.
          if self.emptySlotStacks[genericBagType].displayed then
            hideItem = true
          else
            -- Prevent any more empty slots of this generic container type from appearing in this group.
            self.emptySlotStacks[genericBagType].displayed = true
            -- Override the normal empty slot item with the stack so the count displays.
            item = self.emptySlotStacks[genericBagType]
            isEmptySlotStack = true
          end
        end

        -- Determine whether this item is hidden.
        if
          not self.editMode
          and not self.showHidden
          and self.highlightItemsInContainerLocked ~= item.bagNum -- Unhide items when bag highlighting is locked on.
          and self.hideItems[item.id]
        then
          hideItem = true
        end

        if not hideItem then
          -- Ensure slot button exists.
          self.ui:CreateInventoryItemSlotButton(currentItemSlotButtonNum)

          button = buttons.itemSlots[currentItemSlotButtonNum]

          -- Ensure parentage of item slot button is set to current group frame.
          -- This is required to get the layering right -- without it, stuff can end up behind groups.
          button:SetParent(groupFrame)

          -- Record details of this button's assignments so we can access
          -- them during UI events.
          button.bagshuiData.groupId = groupId
          button.bagshuiData.position = position
          -- These always need to refer to the original item's location so
          -- empty slot stacks magically work with click events
          button.bagshuiData.bagNum = self.groupItems[groupId][position].bagNum
          button.bagshuiData.slotNum = self.groupItems[groupId][position].slotNum
          button.bagshuiData.isEmptySlotStack = isEmptySlotStack

          -- Display the item slot button.
          self:ShowFrameInNextPosition("AssignItemsToSlots", rowNum, button, itemSlotSize)

          -- Add the item to the button (texture, tooltip, etc.).
          self.ui:AssignItemToItemButton(button, item, groupId)

          -- Should the Clam button be enabled?
          if item.openable == 1 then
            self.hasOpenables = true
            -- The first openable item we come across will be the one the Clam button targets.
            if not self.nextOpenableItemBagNum then
              self.nextOpenableItemBagNum = item.bagNum
              self.nextOpenableItemSlotNum = item.slotNum
              self.nextOpenableItemSlotButton = button
            end
          end

          -- Increment counters.
          itemsPlacedInCurrentRow = itemsPlacedInCurrentRow + 1
          currentItemSlotButtonNum = currentItemSlotButtonNum + 1

          -- When we reach the end of a row, move to the next one.
          if itemsPlacedInCurrentRow == groupWidthInItems then
            itemsPlacedInCurrentRow = 0
            rowNum = rowNum + 1
          end
        end
      end
    end

    return currentItemSlotButtonNum
  end

  --- Call this before using `UpdateEmptySlotStackCount()` to zero the counts on the self.emptySlotStacks items
  ---@param resetBagsRepresented boolean? Clear the `_bagsRepresented` property of the empty slot stack items. Should only be called with `true` once per window update.
  function Inventory:ResetEmptySlotStackCounts(resetBagsRepresented)
    for _, emptySlotStack in pairs(self.emptySlotStacks) do
      emptySlotStack.count = 0
      emptySlotStack.displayed = false
      if resetBagsRepresented then
        BsUtil.TableClear(emptySlotStack._bagsRepresented)
      end
    end
  end

  --- Loop through all items in a group and add their counts to the appropriate empty
  --- slot stack using `UpdateEmptySlotStackCount()`
  ---@param groupId number ID of group to count empty slots for.
  function Inventory:CountEmptySlots(groupId)
    self:ResetEmptySlotStackCounts()
    for _, item in pairs(self.groupItems[groupId]) do
      self:UpdateEmptySlotStackCount(item)
    end
  end

  --- Has the user hidden this bag's items (right-click or Ctrl+Click on its bag button)?
  ---@param bagNum number
  ---@return boolean
  function Inventory:IsBagHidden(bagNum)
    local settingName = Bagshui.config.HideBagSettings[bagNum]
    return settingName ~= nil and self.settings[settingName] == true
  end

  --- Should this bag's items be left out of the window right now?
  --- Same exceptions as individually hidden items: Edit Mode, Show Hidden, and a locked bag highlight.
  ---@param bagNum number
  ---@return boolean
  function Inventory:IsBagHiddenInLayout(bagNum)
    return not self.editMode
      and not self.showHidden
      and self.highlightItemsInContainerLocked ~= bagNum
      and self:IsBagHidden(bagNum)
  end

  --- Determine whether a slot is empty, and if so, add 1 to the appropriate per-bag-type empty slot stack.
  ---@param item table Bagshui inventory cache entry.
  ---@return boolean # true if the item is an empty slot.
  function Inventory:UpdateEmptySlotStackCount(item)
    -- Only increment the count for slots that are empty AND not temporarily prevented from stacking.
    if item.emptySlot == 1 and not item._bagshuiPreventEmptySlotStack then
      -- Empty slots in bags the user has hidden don't count toward any stack.
      if self:IsBagHiddenInLayout(item.bagNum) then
        return true
      end
      -- genericType SHOULD be filled in, but let's just be sure.
      local genericBagType = self.containers[item.bagNum].genericType or BsGameInfo.itemSubclasses.Container.Bag
      -- Increment the count.
      self.emptySlotStacks[genericBagType].count = self.emptySlotStacks[genericBagType].count + 1
      -- Record that the bag containing this item is represented by this stack
      -- (used during container mouseover slot highlighting).
      self.emptySlotStacks[genericBagType]._bagsRepresented[item.bagNum] = true
      -- Return true so calling functions can know the item is an empty slot.
      return true
    end
    return false
  end

  --- Return the number of items in a group that will be visible, accounting for stacked slots and hidden items.
  --- Also updates `self.hasHiddenItems`.
  ---@param groupId number ID of group to get the number of items for.
  ---@param zeroUnlessHasItemsInBagNum number? Return 0 unless the group has items that are in the specified bag number -- in that case, return the normal count.
  ---@return integer visibleItemCount
  function Inventory:GetGroupItemCountForLayout(groupId, zeroUnlessHasItemsInBagNum)
    -- No items.
    if not self.groupItems[groupId] then
      return 0
    end

    -- Quickly return real count when we're in Edit Mode since nothing can be hidden.
    if self.editMode then
      return table.getn(self.groupItems[groupId])
    end

    -- Slot stacking / item hiding is enabled, so prepare for more complex counting.
    local visibleItemCount = 0
    local itemVisible
    local hasEmptySlots = false
    local hasItemsInFilterBag = false

    -- We'll be using the permanent self.emptySlotStacks items, so reset their counts first.
    self:ResetEmptySlotStackCounts()

    -- Count up the number of visible items while figuring out if there are any empty slots or hidden items.
    for _, item in ipairs(self.groupItems[groupId]) do
      -- Assume the item will be counted
      itemVisible = true

      -- Have we found an item in the bag that will require a full count to be returned?
      if zeroUnlessHasItemsInBagNum and item.bagNum == zeroUnlessHasItemsInBagNum then
        hasItemsInFilterBag = true
      end

      -- Empty slot stacks and hidden items.
      if self:IsBagHiddenInLayout(item.bagNum) then
        -- This item is in a bag the user has hidden. Mark that hidden items exist so the
        -- toolbar's Show Hidden button is enabled.
        self.hasHiddenItems = true
        itemVisible = false
      elseif self:UpdateEmptySlotStackCount(item) then
        -- This is an empty slot stack, which we know because in addition to
        -- updating the appropriate empty slot stack proxy item in self.emptySlotsStacks,
        -- UpdateEmptySlotStackCount() returns true if the given item is an empty slot.
        if self.emptySlotStackingAllowed then
          itemVisible = false
          hasEmptySlots = true
        end
      elseif self.hideItems[item.id] then
        -- Hidden items.
        -- We need to update hasHiddenItems even if we're not actually hiding this item so that the toolbar icon will be enabled.
        self.hasHiddenItems = true
        -- Need to count the item when in Edit Mode or hidden items are shown.
        itemVisible = (self.editMode or self.showHidden or self.highlightItemsInContainerLocked == item.bagNum)
      end

      -- Increment count if visible.
      if itemVisible then
        visibleItemCount = visibleItemCount + 1
      end
    end

    -- Add 1 for each empty slot stack that contains 1 or more slots.
    if hasEmptySlots then
      for _, emptySlotStack in pairs(self.emptySlotStacks) do
        if emptySlotStack.count > 0 then
          visibleItemCount = visibleItemCount + 1
        end
      end
    end

    -- We were asked for a full count ONLY If this group has items in a specific bag.
    if zeroUnlessHasItemsInBagNum and not hasItemsInFilterBag then
      return 0
    end

    return visibleItemCount
  end

  --- Prepare a layout table to be used by `ShowFrameInNextPosition()`.
  ---@param positioningTableName string Identifier for this positioning table that will also be passed to `ShowFrameInNextPosition()`.
  ---@param frameXSpacing number Horizontal space between frames.
  ---@param frameYSpacing number Vertical space between frames.
  ---@param initialAnchorToFrame table Frame to which the first frame should be attached.
  ---@param initialXOffset number Horizontal space between initialAnchorToFrame and first frame.
  ---@param initialYOffset number Vertical space between initialAnchorToFrame and first frame.
  function Inventory:InitFramePositioningTable(
    positioningTableName,
    frameXSpacing,
    frameYSpacing,
    initialAnchorToFrame,
    initialXOffset,
    initialYOffset
  )
    -- Set up positioning variable storage.
    -- The table doesn't need to be cleared if it already exists because all its values will be reset below.
    if self.positioningTables[positioningTableName] == nil then
      self.positioningTables[positioningTableName] = {}
    end
    local positioningTable = self.positioningTables[positioningTableName]

    -- Define anchor points and spacing.
    positioningTable.anchorXPoint = self.settings.windowContentAlignment
    positioningTable.anchorLeft = positioningTable.anchorXPoint == "LEFT"
    positioningTable.anchorToPointXRowStart = "TOP" .. positioningTable.anchorXPoint
    positioningTable.anchorToPointXSubsequent = "BOTTOM" .. BsUtil.FlipAnchorPoint(positioningTable.anchorXPoint)
    positioningTable.frameXSpacing = frameXSpacing
    positioningTable.frameYSpacing = frameYSpacing

    -- Track the current row so we know when to move to a new one.
    positioningTable.currentRow = nil

    -- Each time we move to a new row, this is the frame the first element of the new row will anchor to.
    positioningTable.firstVisibleFrameInPreviousRow = nil

    -- The very first frame anchors to the bottom corner of the given frame.
    positioningTable.anchorPoint = "BOTTOM" .. positioningTable.anchorXPoint
    positioningTable.initialAnchorToFrame = initialAnchorToFrame
    positioningTable.anchorToFrame = initialAnchorToFrame
    positioningTable.anchorToPoint = positioningTable.anchorPoint

    -- These are the initial values for X and Y offsets.
    positioningTable.anchorXOffset = initialXOffset
    positioningTable.anchorYOffset = initialYOffset
  end

  --- Helper function for `UpdateWindow()` to manage the process of displaying the grid of
  --- groups and items within those groups at the correct location.
  ---@param positioningTableName string Identifier for this positioning table that was prepared in `InitFramePositioningTable()`.
  ---@param rowNum number Current row number.
  ---@param frame table Frame to display.
  ---@param width number Frame width.
  ---@param height number? Frame height (will use width if not specified).
  ---@param scale number? Frame scale.
  function Inventory:ShowFrameInNextPosition(positioningTableName, rowNum, frame, width, height, scale)
    local positioningTable = self.positioningTables[positioningTableName]

    assert(
      positioningTable,
      "Inventory:ShowFrameInNextPosition(): Positioning table '"
        .. tostring(positioningTableName)
        .. "' has not been initialized; must call InitFramePositioningTable() first!"
    )

    -- self:PrintDebug(
    -- 	"Showing " .. frame:GetName() .. " for row " .. rowNum
    -- 	.. "\nAnchor point:" .. positioningTable.anchorPoint
    -- 	.. "\nAnchor frame:" .. positioningTable.anchorToFrame:GetName()
    -- 	.. "\nAnchor frame point:" .. positioningTable.anchorToPoint
    -- 	.. "\nX offset:" .. (positioningTable.anchorLeft and -positioningTable.anchorXOffset or positioningTable.anchorXOffset)
    -- 	.. "\nY offset:" .. positioningTable.anchorYOffset
    -- 	.. "\nWidth" .. width
    -- 	.. "\nHeight" .. height
    -- 	.. "\nScale" .. tostring(scale)
    -- )

    -- Is this a new row?
    -- nil check is so this only happens once we're above the first row.
    if positioningTable.currentRow ~= nil and positioningTable.currentRow ~= rowNum then
      -- Anchor to the first frame in the previous row.
      positioningTable.anchorToFrame = positioningTable.firstVisibleFrameInPreviousRow
      positioningTable.anchorToPoint = positioningTable.anchorToPointXRowStart
      positioningTable.anchorXOffset = 0
      -- First frame in the row needs to be higher up.
      positioningTable.anchorYOffset = positioningTable.frameYSpacing
    end

    -- Display the frame.
    self:SizeAndShowFrame(
      frame,
      positioningTable.anchorPoint,
      positioningTable.anchorToFrame,
      positioningTable.anchorToPoint,
      positioningTable.anchorLeft and -positioningTable.anchorXOffset or positioningTable.anchorXOffset,
      positioningTable.anchorYOffset,
      width,
      height,
      scale,
      -positioningTable.frameXSpacing -- HitRectInsets
    )

    -- The next element in a row always anchors to the previous one.
    positioningTable.anchorToFrame = frame

    -- When we move to a new row, update positioning variables to the proper state for anchoring within the same row.
    if positioningTable.currentRow ~= rowNum then
      -- Update the row number of the tracking variable so we know we've found the first visible element in this row.
      positioningTable.currentRow = rowNum
      -- Change the anchor point for subsequent frames.
      positioningTable.anchorToPoint = positioningTable.anchorToPointXSubsequent
      -- Subsequent frames in this row will be spaced using the frameXSpacing set by InitFramePositioningTable().
      positioningTable.anchorXOffset = -positioningTable.frameXSpacing
      -- Subsequent frames in this same row should be at the same vertical offset.
      positioningTable.anchorYOffset = 0
      -- Keep a note of the first frame int this row because the first frame in the next row will anchor to it.
      positioningTable.firstVisibleFrameInPreviousRow = frame
    end
  end

  -- SizeAndShowFrame() gets called a LOT so let's reuse variables to cut down on garbage collection.
  local sizeAndShow_frame, sizeAndShow_finalScale, sizeAndShow_inverseScale, sizeAndShow_sizeWasSetViaScaling

  --- Display the given frame at the specified position and size.
  ---@param frameObjOrName table|string Frame or name of frame.
  ---@param frameAttachPoint string Point on `frameObjOrName` that should be be attached.
  ---@param attachToFrame table|string Frame to which `frameObjOrName` should be attached.
  ---@param attachToPoint string Point on `attachToFrame` to which `frameObjOrName` should be attached..
  ---@param xOffset number? Horizontal offset for `frameObjOrName` (negative for left).
  ---@param yOffset number? Vertical offset for `frameObjOrName` (negative for down).
  ---@param width number Width of the frame.
  ---@param height number? Height of the frame (will use width if not specified).
  ---@param scale number? Scaling factor (0 - 1) that should be applied to the frame.
  ---@param hitRectInsets number? Hit rectangle insets to should be applied to the frame.
  function Inventory:SizeAndShowFrame(
    frameObjOrName,
    frameAttachPoint,
    attachToFrame,
    attachToPoint,
    xOffset,
    yOffset,
    width,
    height,
    scale,
    hitRectInsets
  )
    -- Get the frame object.
    sizeAndShow_frame = frameObjOrName
    if type(frameObjOrName) == "string" then
      sizeAndShow_frame = _G[frameObjOrName]
    end

    assert(
      sizeAndShow_frame ~= nil,
      "Invalid frame '" .. tostring(frameObjOrName) .. "' provided to SizeAndShowFrame()."
    )

    -- When an item slot button is sized by calling SetItemButtonSize, calling SetWidth/SetHeight isn't necessary.
    sizeAndShow_sizeWasSetViaScaling = false

    -- Item slot buttons should always be sized by scaling if possible, so do it automatically.
    if
      not scale
      and sizeAndShow_frame.bagshuiData
      and sizeAndShow_frame.bagshuiData.type == BS_UI_ITEM_BUTTON_TYPE.ITEM
    then
      scale = self.ui:SetItemButtonSize(sizeAndShow_frame, width)
      sizeAndShow_sizeWasSetViaScaling = scale ~= nil
    end

    -- We need to know both the scale factor to apply to the frame and the inverse scale,
    -- because SetPoint() uses the frame scale for offsets, so we need to un-scale the offsets.
    sizeAndShow_finalScale = scale or 1
    sizeAndShow_inverseScale = 1 / sizeAndShow_finalScale

    -- Normal behavior -- set height, width, and scale.
    if not sizeAndShow_sizeWasSetViaScaling then
      sizeAndShow_frame:SetWidth(width)
      sizeAndShow_frame:SetHeight(height or width)
      sizeAndShow_frame:SetScale(sizeAndShow_finalScale)
    end

    -- Move frame to the specified point.
    sizeAndShow_frame:ClearAllPoints()
    sizeAndShow_frame:SetPoint(
      frameAttachPoint,
      attachToFrame,
      attachToPoint,
      xOffset * sizeAndShow_inverseScale,
      yOffset * sizeAndShow_inverseScale
    )

    -- Adjust hit rectangle insets.
    if hitRectInsets then
      sizeAndShow_frame:SetHitRectInsets(hitRectInsets, hitRectInsets, hitRectInsets, hitRectInsets)
    end

    sizeAndShow_frame:Show()

    -- For some reason, an initial call to GetTop() is sometimes necessary to prevent it
    -- from returning nil later.
    sizeAndShow_frame:GetTop()
  end

  --- Automatically select the next Group Move Target based on groupMoveTargetCount,
  --- creating it if needed, then display using `ShowFrameInNextPosition()`
  ---@param width number Desired width of the group move target.
  ---@param height number Desired height of the group move target.
  ---@param uiRowNum number Current row number within the UI layout.
  ---@param layoutRowNum number Current layout/structure row number that the group move target should act on.
  ---@param layoutColumnNum number Current layout/structure column number that the group move target should act on.
  ---@param insertType BS_INVENTORY_LAYOUT_DIRECTION Whether the roup move target should act on rows or columns.
  function Inventory:ShowNextGroupMoveTarget(width, height, uiRowNum, layoutRowNum, layoutColumnNum, insertType)
    -- Increment count of targets and create a new one if needed.
    self.groupMoveTargetCount = self.groupMoveTargetCount + 1
    self.ui:CreateGroupMoveTarget(self.groupMoveTargetCount)

    local groupMoveTarget = self.ui.frames.groupMoveTargets[self.groupMoveTargetCount]

    -- Snag the button within the group move target frame so we can resize it and set properties.
    local button = self.ui.frames.groupMoveTargets[self.groupMoveTargetCount].bagshuiData.button

    -- This information will be pulled when the group move target button is clicked.
    button.bagshuiData.insert = insertType
    button.bagshuiData.rowNum = layoutRowNum
    button.bagshuiData.columnNum = layoutColumnNum

    -- Select button offsets based on whether the group is horizontal or vertical (start by assuming vertical).
    local xOffsetLeft = BsSkin.groupMoveTargetAnchorOffset
    local xOffsetRight = xOffsetLeft
    local yOffset = BsSkin.groupMoveTargetLongDimensionSubtraction
    if width > height then
      -- This one is horizontal.
      xOffsetRight = -(BsSkin.groupMoveTargetLongDimensionSubtraction + BsSkin.groupMoveTargetThinDimension + 1)
      xOffsetLeft = xOffsetRight - BsSkin.groupMoveTargetAnchorOffset * 2
      yOffset = -BsSkin.groupMoveTargetAnchorOffset
    end

    -- Set button offsets so the move target is visually shorter than the height/width of the groups.
    button:SetPoint("TOPLEFT", groupMoveTarget, "TOPLEFT", -xOffsetLeft, -yOffset)
    button:SetPoint("BOTTOMRIGHT", groupMoveTarget, "BOTTOMRIGHT", xOffsetRight, yOffset)

    -- Display the frame.
    self:ShowFrameInNextPosition("UpdateWindow", uiRowNum, groupMoveTarget, width, height)
  end

  --- Update free/available slot counts. Subclasses should override for special bag bar stuff.
  function Inventory:UpdateBagBar()
    local showBagUsage = self.settings.bagUsageAlwaysShow
    local showUsageSummary = false

    -- We always need to do one loop through the bag buttons to refresh the appearance and make some decisions.
    for _, bagSlotButton in ipairs(self.ui.buttons.bagSlots) do
      -- Set button textures -- necessary for them to be correct when viewing another character's inventory.
      _G.SetItemButtonTexture(bagSlotButton, self.containers[bagSlotButton.bagshuiData.bagNum].texture)

      -- Locked highlight border.
      if self.highlightItemsInContainerLocked == bagSlotButton.bagshuiData.bagNum then
        bagSlotButton.bagshuiData.buttonComponents.border:SetBackdropBorderColor(
          BS_COLOR.ITEM_SLOT_HIGHLIGHT[1],
          BS_COLOR.ITEM_SLOT_HIGHLIGHT[2],
          BS_COLOR.ITEM_SLOT_HIGHLIGHT[3],
          BsSkin.itemSlotBorderContainerHighlightOpacity
        )
        bagSlotButton.bagshuiData.buttonComponents.innerGlow:SetVertexColor(
          BS_COLOR.ITEM_SLOT_HIGHLIGHT[1],
          BS_COLOR.ITEM_SLOT_HIGHLIGHT[2],
          BS_COLOR.ITEM_SLOT_HIGHLIGHT[3],
          BsSkin.itemSlotInnerGlowOpacity + 0.2
        )
        bagSlotButton.bagshuiData.highlightBorderApplied = true
      elseif self.highlightItemsInContainerLocked ~= bagSlotButton.bagshuiData.bagNum then
        bagSlotButton.bagshuiData.buttonComponents.border:SetBackdropBorderColor(
          BsSkin.itemSlotBorderDefaultColor.r,
          BsSkin.itemSlotBorderDefaultColor.g,
          BsSkin.itemSlotBorderDefaultColor.b,
          BsSkin.itemSlotBorderOpacity
        )
        bagSlotButton.bagshuiData.buttonComponents.innerGlow:SetVertexColor(0, 0, 0, 0)
        bagSlotButton.bagshuiData.highlightBorderApplied = false
      end

      -- Offline icon texture opacity.
      bagSlotButton.bagshuiData.buttonComponents.iconTexture:SetVertexColor(
        BS_COLOR.ITEM_SLOT_STATE_NORMAL[1],
        BS_COLOR.ITEM_SLOT_STATE_NORMAL[2],
        BS_COLOR.ITEM_SLOT_STATE_NORMAL[3],
        (not self.online and BsSkin.itemSlotTextureOfflineOpacity or 1)
          -- Dim bags whose items are hidden.
          * (self:IsBagHidden(bagSlotButton.bagshuiData.bagNum) and 0.4 or 1)
      )

      -- Overall button opacity.
      bagSlotButton:SetAlpha(
        self.editMode and 0.2
          -- When an item in the inventory is moused over, we want to dim everything but the container it's in.
          or (
            self.hoveredItem
            and (
              (
                                      -- Empty slot stack.
self.hoveredItem._bagsRepresented
                    and self.hoveredItem._bagsRepresented[bagSlotButton.bagshuiData.bagNum]
                  -- Normal item.
                  or self.hoveredItem.bagNum == bagSlotButton.bagshuiData.bagNum
                )
                and 1
              or 0.4
            )
          )
          -- When the container highlight is locked on, dim other bags.
          or ((self.highlightItemsInContainerLocked and self.highlightItemsInContainerLocked ~= bagSlotButton.bagshuiData.bagNum) and 0.7)
          -- No item currently hovered.
          or 1
      )

      -- Display free space information when the mouse is over any button.
      if bagSlotButton.bagshuiData.mouseIsOver then
        showBagUsage = true
        showUsageSummary = true
      end
    end

    -- Also display free space information when the mouse is over the summary area.
    if self.alwaysShowUsageSummary or self.ui.frames.spaceSummary.bagshuiData.mouseIsOver then
      showUsageSummary = true
    end

    -- Cancel free space display in Edit Mode.
    if self.editMode then
      showBagUsage = false
      showUsageSummary = false
    end

    -- Width of bag space summary text area to the right of the bag bar that will be added
    -- to the overall bag bar width.
    local summaryWidth = 0

    -- Reset space tracking - don't need to worry about whether the table members
    -- are initialized because that's handled below. Here we're only iterating over
    -- what already exists.
    for _, spaceInfo in pairs(self.containerSpace) do
      spaceInfo.available = 0
      spaceInfo.used = 0
      spaceInfo.total = 0
    end
    self.availableSlots, self.usedSlots, self.totalSlots = 0, 0, 0

    -- Gether free space information.
    for _, bagSlotButton in ipairs(self.ui.buttons.bagSlots) do
      -- Step through bag slot buttons and determine available/used/total space.
      local container = self.containers[bagSlotButton.bagshuiData.bagNum]
      local available, used = 0, 0
      local slotText = ""
      if container.numSlots > 0 then
        used = container.slotsFilled
        if container.slotsFilled < container.numSlots then
          available = container.numSlots - used
          slotText = string.format("%s/%s", used, container.numSlots)
        else
          slotText = L.Full
        end
      end
      if showBagUsage then
        bagSlotButton.bagshuiData.buttonComponents.stock:SetText(slotText)
        bagSlotButton.bagshuiData.buttonComponents.stock:Show()
      else
        bagSlotButton.bagshuiData.buttonComponents.stock:Hide()
      end

      local genericType = container.genericType or BsGameInfo.itemSubclasses["Container"]["Bag"]

      -- Initialize space tracking if needed.
      if not self.containerSpace[genericType] then
        self.containerSpace[genericType] = {
          available = 0,
          used = 0,
          total = 0,
        }
      end

      -- Update calculations.
      local spaceInfo = self.containerSpace[genericType]
      spaceInfo.available = spaceInfo.available + available
      spaceInfo.used = spaceInfo.used + used
      spaceInfo.total = spaceInfo.total + container.numSlots
      self.availableSlots = self.availableSlots + available
      self.usedSlots = self.usedSlots + used
      self.totalSlots = self.totalSlots + container.numSlots
    end

    -- Figure out what to display in the summary based on settings.

    local textParts = BsUtil.Split(self.settings.bagUsageFormat, "_")

    local mainText = tostring(textParts[1] == "Used" and self.usedSlots or self.availableSlots)
    local miniText = mainText
    local subText
    if textParts[2] then
      if textParts[2] == "Total" then
        subText = self.totalSlots
      elseif textParts[3] == "Total" then
        subText =
          string.format("%s/%s", (textParts[2] == "Used" and self.usedSlots or self.availableSlots), self.totalSlots)
        -- miniText = miniText .. " (" .. subText .. ")"
      end
    end

    if showUsageSummary then
      self.ui.frames.spaceSummary.bagshuiData.text:SetText(mainText)
      self.ui.frames.spaceSummary.bagshuiData.text:SetTextColor(
        self.settings.groupLabelDefault[1],
        self.settings.groupLabelDefault[2],
        self.settings.groupLabelDefault[3],
        self.settings.groupLabelDefault[4]
      )
      self.ui.frames.miniSpaceSummaryBottom.bagshuiData.text:SetText(miniText)
      self.ui.frames.miniSpaceSummaryBottom.bagshuiData.text:SetTextColor(
        self.settings.groupLabelDefault[1],
        self.settings.groupLabelDefault[2],
        self.settings.groupLabelDefault[3],
        self.settings.groupLabelDefault[4]
      )
      self.ui.frames.miniSpaceSummaryTop.bagshuiData.text:SetText(miniText)
      self.ui.frames.miniSpaceSummaryTop.bagshuiData.text:SetTextColor(
        self.settings.groupLabelDefault[1],
        self.settings.groupLabelDefault[2],
        self.settings.groupLabelDefault[3],
        self.settings.groupLabelDefault[4]
      )
      if subText then
        self.ui.frames.spaceSummary.bagshuiData.text:ClearAllPoints()
        self.ui.frames.spaceSummary.bagshuiData.text:SetPoint("BOTTOM", self.ui.frames.spaceSummary, "CENTER", 0, -2)
        self.ui.frames.spaceSummary.bagshuiData.subtext:SetText(subText)
        self.ui.frames.spaceSummary.bagshuiData.subtext:SetTextColor(
          self.settings.groupLabelDefault[1],
          self.settings.groupLabelDefault[2],
          self.settings.groupLabelDefault[3],
          self.settings.groupLabelDefault[4]
        )
        self.ui.frames.spaceSummary.bagshuiData.subtext:Show()
        self.ui.frames.miniSpaceSummaryBottom.bagshuiData.subtext:SetText(subText)
        self.ui.frames.miniSpaceSummaryBottom.bagshuiData.subtext:SetTextColor(
          self.settings.groupLabelDefault[1],
          self.settings.groupLabelDefault[2],
          self.settings.groupLabelDefault[3],
          self.settings.groupLabelDefault[4]
        )
        self.ui.frames.miniSpaceSummaryBottom.bagshuiData.subtext:Show()
        self.ui.frames.miniSpaceSummaryTop.bagshuiData.subtext:SetText(subText)
        self.ui.frames.miniSpaceSummaryTop.bagshuiData.subtext:SetTextColor(
          self.settings.groupLabelDefault[1],
          self.settings.groupLabelDefault[2],
          self.settings.groupLabelDefault[3],
          self.settings.groupLabelDefault[4]
        )
        self.ui.frames.miniSpaceSummaryTop.bagshuiData.subtext:Show()
      else
        self.ui.frames.spaceSummary.bagshuiData.subtext:Hide()
        self.ui.frames.spaceSummary.bagshuiData.text:ClearAllPoints()
        self.ui.frames.spaceSummary.bagshuiData.text:SetPoint("CENTER", self.ui.frames.spaceSummary, "CENTER")
        self.ui.frames.miniSpaceSummaryBottom.bagshuiData.subtext:Hide()
        self.ui.frames.miniSpaceSummaryBottom.bagshuiData.subtext:SetText("")
        self.ui.frames.miniSpaceSummaryTop.bagshuiData.subtext:Hide()
        self.ui.frames.miniSpaceSummaryTop.bagshuiData.subtext:SetText("")
      end

      -- Resize and show/hide.
      summaryWidth = math.max(
        self.ui.frames.spaceSummary.bagshuiData.text:GetStringWidth(),
        self.ui.frames.spaceSummary.bagshuiData.subtext:GetStringWidth()
      )
      self.ui.frames.spaceSummary:SetWidth(summaryWidth)
      self.ui.frames.spaceSummary:SetAlpha(1) -- Reversing the SetAlpha(0) call that happens when we hide the summary.

      self.ui.frames.miniSpaceSummaryBottom:SetWidth(
        self.ui.frames.miniSpaceSummaryBottom.bagshuiData.text:GetStringWidth()
          + self.ui.frames.miniSpaceSummaryBottom.bagshuiData.subtext:GetStringWidth()
          + 2
      )
      self.ui.frames.miniSpaceSummaryTop:SetWidth(
        self.ui.frames.miniSpaceSummaryTop.bagshuiData.text:GetStringWidth()
          + self.ui.frames.miniSpaceSummaryTop.bagshuiData.subtext:GetStringWidth()
          + 2
      )
    else
      -- Hide space summary.
      self.ui.frames.spaceSummary:SetAlpha(0) -- Using SetAlpha() instead of Hide() so it's still responsive to mouseover.
    end

    -- Set the Bag Bar to the correct width.
    self.ui.frames.bagBar:SetWidth(
      self.ui.frames.bagBar.bagshuiData.baseWidth
        + (math.max(summaryWidth, 15) * self.ui.frames.spaceSummary:GetScale())
        + 10 -- Buffer so nothing gets cut off.
    )
  end

  --- Enable/disable/highlight toolbar buttons as appropriate.
  function Inventory:UpdateToolbar()
    local toolbarButtons = self.ui.buttons.toolbar

    -- Resort icon.
    self:SetToolbarButtonState(
      toolbarButtons.resort,
      nil,
      (
        self.enableResortIcon
        or (
                    -- Docked inventory needs resorting.
self.dockedInventory and self.dockedInventory.enableResortIcon
        )
      )
    )

    -- Restack icon.
    self:SetToolbarButtonState(
      toolbarButtons.restack,
      nil,
      (
        self.multiplePartialStacks
        or (
                    -- Docked inventory has needs restack.
self.dockedInventory and self.dockedInventory.multiplePartialStacks
        )
      )
    )

    -- Show/Hide icon.
    self:SetToolbarButtonState(
      toolbarButtons.showHide,
      nil,
      (self.hasHiddenGroups or self.hasHiddenItems) and not self.editMode,
      self.showHidden,
      L.Toolbar_Hide_TooltipTitle,
      L.Toolbar_Show_TooltipTitle
    )

    -- Highlight Changes icon.
    self:SetToolbarButtonState(
      toolbarButtons.highlightChanges,
      nil,
      self.highlightChangesEnabled and not self.editMode,
      self.highlightChanges,
      L.Toolbar_UnHighlightChanges_TooltipTitle,
      L.Toolbar_HighlightChanges_TooltipTitle
    )

    -- Character icon.
    self:SetToolbarButtonState(
      toolbarButtons.character,
      nil,
      table.getn(BsCharacterData.characterIdList) > 1, -- Only enable when there's more than one character.
      self.activeCharacterId ~= Bagshui.currentCharacterId
    )

    -- Lock highlights for inventories when they're open.
    for inventoryType, _ in self:OtherInventoryTypesInToolbarIconOrder(true) do
      self:SetToolbarButtonState(toolbarButtons[inventoryType], nil, true, Bagshui.components[inventoryType]:Visible())
    end
    -- Catalog.
    self:SetToolbarButtonState(toolbarButtons.catalog, nil, true, BsCatalog:Visible())

    -- Refresh toolbar button colors in case they've changed.
    for _, button in pairs(toolbarButtons) do
      self.ui:SetIconButtonColors(button)
    end

    -- State buttons.
    self:SetToolbarButtonState(toolbarButtons.offline, not self.online)
    self:SetToolbarButtonState(toolbarButtons.error, (string.len(self.errorText or "") > 0))
    self:SetToolbarButtonState(toolbarButtons.editMode, self.editMode, nil, self.editMode)

    -- Error button needs its tooltip updated.
    toolbarButtons.error.bagshuiData.tooltipText = self.errorText

    -- Update status text.
    if self.editMode then
      -- Show active Structure profile name when editing.
      self.ui.text.status:SetText(
        NORMAL_FONT_COLOR_CODE
          .. string.format(L.Symbol_Colon, L.Profile_Structure)
          .. FONT_COLOR_CODE_CLOSE
          .. " "
          .. BsProfiles:GetName(self.settings.profileStructure)
      )
      self.ui.frames.status:Show()
      -- Move the offline character name into the tooltip in edit mode.
      toolbarButtons.offline.bagshuiData.tooltipText = GRAY_FONT_COLOR_CODE
        .. self.activeCharacterId
        .. FONT_COLOR_CODE_CLOSE
    else
      self.ui.text.status:SetText(self.activeCharacterId)
      if self.activeCharacterId ~= Bagshui.currentCharacterId then
        self.ui.frames.status:Show()
      else
        self.ui.frames.status:Hide()
      end
      -- Don't need the offline character name in the tooltip normally.
      toolbarButtons.offline.bagshuiData.tooltipText = nil
    end

    -- Money frame.
    if self.settings.showMoney then
      self.ui.frames.money:Show()
      self.ui.frames.money:SetAlpha(self.editMode and 0.2 or 1)
      -- Use label colors for money text.
      for _, text in pairs(self.ui.frames.money.bagshuiData.texts) do
        text:SetTextColor(
          self.settings.groupLabelDefault[1],
          self.settings.groupLabelDefault[2],
          self.settings.groupLabelDefault[3],
          self.settings.groupLabelDefault[4]
        )
      end
    else
      self.ui.frames.money:Hide()
    end

    -- Hearthstone button.
    if self.hearthButton and self.settings.showFooter and self.settings.showHearthstone and self.hearthstoneItemRef then
      toolbarButtons.hearthstone:Show()

      -- Display cooldown.
      local cooldownStart, cooldownDuration, isOnCooldown =
        _G.GetContainerItemCooldown(self.hearthstoneItemRef.bagNum, self.hearthstoneItemRef.slotNum)
      self.ui:SetIconButtonCooldown(toolbarButtons.hearthstone, cooldownStart, cooldownDuration, isOnCooldown)
    else
      toolbarButtons.hearthstone:Hide()
    end

    -- Clam (open container) button.
    self:SetToolbarButtonState(
      toolbarButtons.clam,
      (self.clamButton and self.settings.showClam or false),
      (
        self.hasOpenables
        and not self.editMode
        -- Don't allow at Bank because UseContainerItem() moves the item
        -- instead of opening it.
        and not Bagshui.components.Bank.atBank
        -- Avoid messing with item highlighting during a pending sale.
        and not self.itemPendingSale
      )
    )

    -- Disenchant button.
    self:SetToolbarButtonState(
      toolbarButtons.disenchant,
      (
        self.disenchantButton
          and BsCharacter.spellNamesToIds[toolbarButtons.disenchant.bagshuiData.spellName]
          and self.settings.showDisenchant
        or false
      ),
      not self.editMode
    )

    -- Pick Lock button.
    self:SetToolbarButtonState(
      toolbarButtons.pickLock,
      (
        self.pickLockButton
          and BsCharacter.spellNamesToIds[toolbarButtons.pickLock.bagshuiData.spellName]
          and self.settings.showPickLock
        or false
      ),
      not self.editMode
    )

    -- Utilization summaries.
    if
      self.alwaysShowUsageSummary
      and (not self.settings.showFooter or (self.settings.showFooter and not self.settings.showBagBar))
    then
      if self.settings.showFooter then
        self.ui.frames.miniSpaceSummaryBottom:Show()
        self.ui.frames.miniSpaceSummaryTop:Hide()
      else
        self.ui.frames.miniSpaceSummaryBottom:Hide()
        self.ui.frames.miniSpaceSummaryTop:Show()
      end
    else
      self.ui.frames.miniSpaceSummaryBottom:Hide()
      self.ui.frames.miniSpaceSummaryTop:Hide()
    end

    -- Re-anchor all toolbar widgets based on visibility.
    self:UpdateToolbarAnchoring("topLeftToolbar", "LEFT")
    self:UpdateToolbarAnchoring("topRightToolbar", "RIGHT")
    self:UpdateToolbarAnchoring("bottomRightToolbar", "RIGHT")

    -- Disable unusable stuff in Edit Mode.
    local editModeState = self.editMode and "Disable" or "Enable"
    -- Hearthstone
    if self.hearthButton then
      self.ui.buttons.toolbar.hearthstone[editModeState](self.ui.buttons.toolbar.hearthstone)
    end
    -- Search
    self.ui.buttons.toolbar.search[editModeState](self.ui.buttons.toolbar.search)

    -- Parent toolbar needs to sync state.
    if self.dockedToInventory then
      self.dockedToInventory:UpdateToolbar()
    end
  end

  --- Control the state and appearance of a toolbar button.
  ---@param button table Button object.
  ---@param visible boolean? Whether the button should be displayed.
  ---@param enable boolean? Whether the button should be enabled.
  ---@param lockHighlight boolean? Whether the button should be highlighted.
  ---@param lockedHighlightTooltip string? Tooltip title to display when the button highlight is locked.
  ---@param unlockedHighlightTooltip string? Tooltip title to display when the button highlight is unlocked.
  function Inventory:SetToolbarButtonState(
    button,
    visible,
    enable,
    lockHighlight,
    lockedHighlightTooltip,
    unlockedHighlightTooltip
  )
    if visible == nil then
      visible = true
    end
    button[visible and "Show" or "Hide"](button)

    if button.Enable then
      if enable == nil then
        enable = true
      end
      button[enable and "Enable" or "Disable"](button)
    end

    if button.LockHighlight then
      if lockHighlight then
        if lockedHighlightTooltip then
          button.bagshuiData.tooltipTitle = lockedHighlightTooltip
        end
        button:LockHighlight()
      else
        if unlockedHighlightTooltip then
          button.bagshuiData.tooltipTitle = unlockedHighlightTooltip
        end
        button:UnlockHighlight()
      end
    end

    -- Update tooltip if it's visible so that text stays current.
    if
      button.bagshuiData.isIconButton
      and button.bagshuiData.mouseIsOver
      and BsIconButtonTooltip:IsVisible()
      and BsIconButtonTooltip:IsOwned(button)
    then
      self.ui:ShowIconButtonTooltip(button, 0)
    end
  end

  --- Toolbar icons need their anchors updated based on what's shown.
  ---@param widgetOrderTable string Name of table in `self.ui.ordering`, which is an array of WoW UI widgets, in display order. Can also include numbers as spacing directives that override the default.
  ---@param anchorPoint "LEFT"|"RIGHT" Place to anchor each widget. This point will be anchored to the opposing point of the previous widget.
  function Inventory:UpdateToolbarAnchoring(widgetOrderTable, anchorPoint)
    local widgetList = self.ui.ordering[widgetOrderTable]
    local invert = (anchorPoint == "RIGHT" and -1 or 1)
    local defaultOffset = invert * BsSkin.toolbarSpacing
    local nextOffset

    -- Go through the list of widgets in order, but skip the first one since
    -- that's only there as the left/rightmost anchor.
    for widgetPosition = 2, table.getn(widgetList) do
      local widget = widgetList[widgetPosition]
      -- Ignore spacing directives when finding widgets.
      if type(widget) == "table" and widget:IsShown() then
        -- Assume default spacing, adjusted if customized for the widget.
        nextOffset = defaultOffset + (widget.bagshuiData and widget.bagshuiData.autoLayoutXOffset or 0)
        -- Walk backwards through the list of widgets and anchor to the first visible one.
        for anchorPosition = widgetPosition - 1, 1, -1 do
          if type(widgetList[anchorPosition]) ~= "table" then
            -- Spacing directive found. Use this instead of the default.
            if type(widgetList[anchorPosition]) == "number" then
              nextOffset = widgetList[anchorPosition]
            end
          else
            -- Check visibility and update anchoring.
            local anchorButton = widgetList[anchorPosition]
            if anchorButton:IsShown() then
              widget:SetPoint(anchorPoint, anchorButton, BsUtil.FlipAnchorPoint(anchorPoint), nextOffset, 0)
              break
            end
          end
        end -- Inner anchor finding loop.
      end
    end -- Widget iteration.
  end

  --- It seems like the client doesn't always catch situations where frames move out from
  --- under the cursor. When empty slots are expanded/collapsed, that's exactly what happens, so
  --- we have to manually hide the tooltip (handled in `ItemButton_OnClick()`) and we also need to determine
  --- if the mouse is over an item button **after** the UI is redrawn. To do that, `UpdateWindow()` queues a
  --- call to this function on the next frame update. Then we can evaluate whether the mouse is present,
  --- and if so, update the UI to reflect that.
  --- This is also an issue when picking up and putting down Categories/Groups/Items in Edit Mode,
  --- where we manually hide tooltips and need to make them reappear when something is put back down.
  function Inventory:ItemSlotAndGroupMouseOverCheck()
    local mouseOverFound = false
    for _, button in self.ui.buttons.itemSlots do
      -- The IsVisible() check is needed because item slot frames that are hidden will still return true for MouseIsOver().
      if _G.MouseIsOver(button) and button:IsVisible() then
        self:ItemButton_OnEnter(button)
        mouseOverFound = true
        break
      end
    end
    if self.editMode and not mouseOverFound then
      for _, group in self.ui.frames.groups do
        if _G.MouseIsOver(group) and group:IsVisible() then
          self:Group_OnEnter(group)
        end
      end
    end
  end

  --- Look through the inventory cache to find and record references to any special items.
  --- Currently only used for the Hearthstone.
  function Inventory:FindSpecialItems()
    -- Reset Hearthstone item tracking.
    self.hearthstoneItemRef = nil
    self.hideItems[BS_INVENTORY_HEARTHSTONE_ITEM_ID] = (
      self.hearthButton
      and self.settings.showHearthstone
      and self.settings.showFooter
    ) or nil

    for _, bagContents in pairs(self.inventory) do
      for __, item in ipairs(bagContents) do
        -- Check for Hearthstone.
        if self.hearthButton and item.id == BS_INVENTORY_HEARTHSTONE_ITEM_ID then
          self.hearthstoneItemRef = item
        end
      end
    end
  end

  --- Toggle an inventory class property.
  --- Used to display/hide hidden items, enable/disable highlighting of changes,
  --- maybe more in the future?
  ---@param propertyName any
  function Inventory:ToggleProperty(propertyName)
    if not propertyName then
      return
    end
    _G.PlaySound("igMainMenuOptionCheckBox" .. (self[propertyName] and "Off" or "On"))
    self[propertyName] = not self[propertyName]
    self:ForceUpdateWindow()

    if self.dockedInventory then
      self.dockedInventory:ToggleProperty(propertyName)
    end
  end
end)