DataTreeListView with CustomSorter

[alon]

When I set the CustomSorter of a DataTreeListView the sort is not working.
The same CustomSorte for a DataListView on the same data works fine.

I think CustomSorter is used internally by DataTreeListView - see VirtualObjectListView (?)

With regards,
Alon

[alon]

From the Cookbook:

If you are using a VirtualObjectListView (or one of its subclasses FastObjectListView or TreeListView), you cannot use the CustomSorter. You have to implement the SortObjects() method of the IVirtualListDataSource.

1. Could not find IVirtualListDataSource.SortObjects ?
2. When implementing my IVirtualListDataSource should I derive it from TreeListView.Tree?
3. And how do I inject my IVirtualListDataSource into my DataTreeListView

sounds too complicated... :(

[alon]

The solution I found:

    public sealed class MyDataTreeListView : DataTreeListView
    {
        public MyDataTreeListView()
        {
            TreeFactory = treeView => new MyTree(treeView);
            RegenerateTree();
        }

        private class MyTree : Tree
        {
            private OLVColumn _lastSortColumn;
            private SortOrder _lastSortOrder;

            public MyTree(TreeListView treeView)
                : base(treeView)
            {
            }

            public override void Sort(OLVColumn column, SortOrder order)
            {
                _lastSortColumn = column;
                _lastSortOrder = order;

                base.Sort(column, order);
            }

            protected override BranchComparer GetBranchComparer()
            {
                if (_lastSortColumn == null)
                    return null;

                return new BranchComparer(new MyModelObjectComparer(
                    _lastSortColumn,
                    _lastSortOrder,
                    TreeView.SecondarySortColumn ?? TreeView.GetColumn(0),
                    TreeView.SecondarySortColumn == null ? _lastSortOrder : TreeView.SecondarySortOrder));
            }
        }

        private class MyModelObjectComparer : IComparer, IComparer<object>
        {
            private readonly OLVColumn _column;
            private readonly SortOrder _sortOrder;
            private readonly ModelObjectComparer _olvMyModelObjectComparer;
            readonly EventViewerOLV.SensorColumnComparer _sensorColumnComparer;

            private MyModelObjectComparer(OLVColumn col, SortOrder order)
            {
                _column = col;
                _sortOrder = order;
                _olvMyModelObjectComparer = new ModelObjectComparer(col, order);

                _sensorColumnComparer = new EventViewerOLV.SensorColumnComparer(_sortOrder);
            }

            public MyModelObjectComparer(OLVColumn col, SortOrder order, OLVColumn col2, SortOrder order2)
                : this(col, order)
            {
            }

            public int Compare(object x, object y)
            {
                if (string.Equals(_column.AspectName, EventViewerManager.ColName.Name))
                {
                    // this is my custom sort...
                    var dataRowX = EventViewerOLV.RowObjectToDataRow(x);
                    var dataRowY = EventViewerOLV.RowObjectToDataRow(y);

                    return _sensorColumnComparer.CompareDataRows(dataRowX, dataRowY);
                }

                return _olvMyModelObjectComparer.Compare(x, y);
            }
        }
    }

Thank you for a great control