/// <summary>
/// Returns last rendered node on screen.
/// </summary>
/// <param name="tree">Tree control.</param>
/// <returns>Last rendered node or null</returns>
public static Node GetLastDisplayedNode(AdvTree tree)
{
Rectangle r = tree.NodeLayout.ClientArea;
Node node = tree.SelectedNode;
if (node == null) node = GetFirstVisibleNode(tree);
Point scrollPos = Point.Empty;
if (tree.AutoScroll)
scrollPos = tree.GetAutoScrollPositionOffset();
// Find last fully rendered node
Node lastNode = null;
if (r.IntersectsWith(node.Bounds))
lastNode = node;
while (node != null)
{
node = NodeOperations.GetNextVisibleNode(node);
if (node != null && node.Selectable)
{
Rectangle nodeRect = NodeDisplay.GetNodeRectangle(eNodeRectanglePart.NodeContentBounds, node, scrollPos);
if (nodeRect.Bottom > r.Bottom)
break;
else if (r.IntersectsWith(nodeRect))
lastNode = node;
}
}
return lastNode;
}
/// <summary>
/// Returns first rendered node on screen.
/// </summary>
/// <param name="tree">Tree control.</param>
/// <returns>Last rendered node or null</returns>
public static Node GetFirstDisplayedNode(AdvTree tree)
{
Rectangle r = tree.GetInnerRectangle();
r.Y += tree.ColumnHeaderHeight;
r.Height -= tree.ColumnHeaderHeight;
Node node = tree.SelectedNode;
if (node == null) node = GetFirstVisibleNode(tree);
Point scrollPos = Point.Empty;
if (tree.AutoScroll)
scrollPos = tree.GetAutoScrollPositionOffset();
// Find last fully rendered node
Node lastNode = null;
if (r.IntersectsWith(node.Bounds))
lastNode = node;
while (node != null)
{
node = NodeOperations.GetPreviousVisibleNode(node);
if (node != null && node.Selectable)
{
Rectangle nodeRect = NodeDisplay.GetNodeRectangle(eNodeRectanglePart.NodeContentBounds, node, scrollPos);
if (r.IntersectsWith(nodeRect))
lastNode = node;
else if (nodeRect.Y < r.Y)
break;
}
}
return lastNode;
}
