public void ScrollNodeIntoView(TreeGridNodeReference node)
{
DoRowLayoutUntilValid();
var visibleRow = this.visibleRows.FirstOrDefault(r => r.NodeReference.Equals(node));
if (visibleRow == null)
{
node.ExpandParents();
int flatIndex;
if (node.TryGetFlatIndex(out flatIndex))
{
this.TopItemIndex = Math.Max(0, flatIndex - this.visibleRows.Count / 3);
}
}
}
public TreeGridRow SelectNode(TreeGridNodeReference node, SelectionOperation op)
{
int nodeIndex;
using (new SelectionChangeSuppressor(this))
{
if (!node.TryGetFlatIndex(out nodeIndex))
{
Debug.Fail("Selected node must be exposed (can't be in a collapsed parent)!");
return null;
}
if (op == SelectionOperation.SelectOne)
{
ClearSelection(false);
AddNodeToSelection(node);
this.selectionAnchorIndex = nodeIndex;
}
else if (op == SelectionOperation.Toggle)
{
if (!this.selectedNodeReferences.ContainsKey(node))
{
AddNodeToSelection(node);
}
else
{
RemoveNodeFromSelection(node);
}
if (this.selectionAnchorIndex == -1)
{
this.selectionAnchorIndex = nodeIndex;
}
}
else if (op == SelectionOperation.Add)
{
if (!this.selectedNodeReferences.ContainsKey(node))
{
AddNodeToSelection(node);
if (this.selectionAnchorIndex == -1)
{
this.selectionAnchorIndex = nodeIndex;
}
}
}
else if (op == SelectionOperation.ExtendTo)
{
if (this.selectionAnchorIndex != -1)
{
int min = Math.Min(this.selectionAnchorIndex, nodeIndex);
int max = Math.Max(this.selectionAnchorIndex, nodeIndex);
ClearSelection(false);
using (var nodeToSelect = this.rootNode.CreateNodeReference(min))
{
while (nodeToSelect != null && (min <= max))
{
AddNodeToSelection(nodeToSelect);
if (!nodeToSelect.MoveToNextFlatNode())
{
break;
}
min += 1;
}
}
}
}
TreeGridRow newCurrentRow = null;
foreach (var row in this.visibleRows)
{
row.IsSelected = this.selectedNodeReferences.ContainsKey(row.NodeReference);
if (row.NodeReference.Equals(this.currentNode))
{
newCurrentRow = row;
}
}
if (newCurrentRow != null)
{
newCurrentRow.IsCurrent = true;
}
return newCurrentRow;
}
}
