private void treeView1_MouseDown(object sender, MouseEventArgs e)
{
TreeNode nodeHit = treeView1.HitTest(e.X, e.Y).Node;
if (nodeHit != null)
{
MultiSelectTreeNode multiNode = nodeHit as MultiSelectTreeNode;
if (multiNode != null)
{
// Use advanced selection rules.
if ((Control.ModifierKeys & Keys.Control) == 0)
{
// Ctrl is not held down.
// Remove previous selection.
List <MultiSelectTreeNode> nodesToDelete =
new List <MultiSelectTreeNode>();
foreach (MultiSelectTreeNode node in selectedNodes)
{
if (node != multiNode)
{
nodesToDelete.Add(node);
}
}
foreach (MultiSelectTreeNode node in nodesToDelete)
{
node.UnSelect();
}
}
if (multiNode.IsSelected)
{
// Node is already selected.
// Toggle it off.
multiNode.UnSelect();
}
else
{
// Add new selection.
multiNode.Select();
}
}
}
}
