static void RegenerateRows(
            UnityPendingChangesTree pendingChangesTree,
            TreeViewItemIds <PendingChangeCategory, PendingChangeInfo> treeViewItemIds,
            PendingChangesTreeView treeView,
            TreeViewItem rootItem,
            List <TreeViewItem> rows,
            bool expandCategories)
        {
            ClearRows(rootItem, rows);

            List <PendingChangeCategory> categories = pendingChangesTree.GetNodes();

            if (categories == null)
            {
                return;
            }

            foreach (PendingChangeCategory category in categories)
            {
                int categoryId;
                if (!treeViewItemIds.TryGetCategoryItemId(category, out categoryId))
                {
                    categoryId = treeViewItemIds.AddCategoryItem(category);
                }

                ChangeCategoryTreeViewItem categoryTreeViewItem =
                    new ChangeCategoryTreeViewItem(categoryId, category);

                rootItem.AddChild(categoryTreeViewItem);
                rows.Add(categoryTreeViewItem);

                if (!expandCategories &&
                    !treeView.IsExpanded(categoryTreeViewItem.id))
                {
                    continue;
                }

                foreach (PendingChangeInfo change in category.GetCurrentChanges())
                {
                    int changeId;
                    if (!treeViewItemIds.TryGetInfoItemId(change, out changeId))
                    {
                        changeId = treeViewItemIds.AddInfoItem(change);
                    }

                    TreeViewItem changeTreeViewItem =
                        new ChangeTreeViewItem(changeId, change);

                    categoryTreeViewItem.AddChild(changeTreeViewItem);
                    rows.Add(changeTreeViewItem);
                }
            }

            if (!expandCategories)
            {
                return;
            }

            treeView.state.expandedIDs = treeViewItemIds.GetCategoryIds();
        }
        static void UpdateCheckStateForSelection(
            PendingChangesTreeView treeView,
            ChangeTreeViewItem senderTreeViewItem)
        {
            IList <int> selectedIds = treeView.GetSelection();

            if (selectedIds.Count <= 1)
            {
                return;
            }

            if (!selectedIds.Contains(senderTreeViewItem.id))
            {
                return;
            }

            bool isChecked = senderTreeViewItem.ChangeInfo.IsChecked();

            foreach (TreeViewItem treeViewItem in treeView.FindRows(selectedIds))
            {
                if (treeViewItem is ChangeCategoryTreeViewItem)
                {
                    ((ChangeCategoryTreeViewItem)treeViewItem).Category
                    .UpdateCheckedState(isChecked);
                    continue;
                }

                ((ChangeTreeViewItem)treeViewItem).ChangeInfo
                .UpdateCheckedState(isChecked);
            }
        }
        static void ChangeTreeViewItemGUI(
            string wkPath,
            PendingChangesTreeView treeView,
            UnityPendingChangesTree pendingChangesTree,
            ChangeTreeViewItem item,
            RowGUIArgs args)
        {
            for (int visibleColumnIdx = 0; visibleColumnIdx < args.GetNumVisibleColumns(); visibleColumnIdx++)
            {
                Rect cellRect = args.GetCellRect(visibleColumnIdx);

                PendingChangesTreeColumn column =
                    (PendingChangesTreeColumn)args.GetColumn(visibleColumnIdx);

                ChangeTreeViewItemCellGUI(
                    cellRect,
                    treeView.rowHeight,
                    treeView,
                    pendingChangesTree,
                    item,
                    column,
                    args.selected,
                    args.focused);
            }
        }
        static void ChangeTreeViewItemCellGUI(
            Rect rect,
            float rowHeight,
            PendingChangesTreeView treeView,
            UnityPendingChangesTree pendingChangesTree,
            ChangeTreeViewItem item,
            PendingChangesTreeColumn column,
            bool isSelected,
            bool isFocused)
        {
            PendingChangeInfo changeInfo = item.ChangeInfo;

            string label = changeInfo.GetColumnText(
                PendingChangesTreeHeaderState.GetColumnName(column));

            if (column == PendingChangesTreeColumn.Item)
            {
                if (pendingChangesTree.HasMeta(changeInfo.ChangeInfo))
                {
                    label = string.Concat(label, UnityConstants.TREEVIEW_META_LABEL);
                }

                Texture             icon            = GetIcon(changeInfo);
                GetOverlayIcon.Data overlayIconData =
                    GetOverlayIcon.ForChange(changeInfo.ChangeInfo);

                bool wasChecked = changeInfo.IsChecked();

                bool isChecked = DrawTreeViewItem.ForCheckableItemCell(
                    rect, rowHeight, item.depth,
                    icon, overlayIconData, label,
                    isSelected, isFocused, false,
                    wasChecked);

                changeInfo.UpdateCheckedState(isChecked);

                if (wasChecked != isChecked)
                {
                    UpdateCheckStateForSelection(treeView, item);
                }

                return;
            }

            if (column == PendingChangesTreeColumn.Size)
            {
                DefaultGUI.LabelRightAligned(rect, label, isSelected, isFocused);
                return;
            }

            DefaultGUI.Label(rect, label, isSelected, isFocused);
        }