private void MultiSelectAdd(TreeListNode clickedNode, Keys modifierKeys)
{
if (Control.ModifierKeys == Keys.None)
{
foreach (TreeListNode node in NodesSelection)
{
int newrow = NodeCollection.GetVisibleNodeIndex(node);
InvalidateRow(newrow);
}
NodesSelection.Clear();
NodesSelection.Add(clickedNode);
}
if (Control.ModifierKeys == Keys.Shift)
{
if (NodesSelection.Count == 0)
{
NodesSelection.Add(clickedNode);
}
else
{
int startrow = NodeCollection.GetVisibleNodeIndex(NodesSelection[0]);
int currow = NodeCollection.GetVisibleNodeIndex(clickedNode);
if (currow > startrow)
{
TreeListNode startingNode = NodesSelection[0];
NodesSelection.Clear();
foreach (TreeListNode node in NodeCollection.ForwardNodeIterator(startingNode, clickedNode, true))
{
NodesSelection.Add(node);
}
Invalidate();
}
if (currow < startrow)
{
TreeListNode startingNode = NodesSelection[0];
NodesSelection.Clear();
foreach (TreeListNode node in NodeCollection.ReverseNodeIterator(startingNode, clickedNode, true))
{
NodesSelection.Add(node);
}
Invalidate();
}
}
}
if (Control.ModifierKeys == Keys.Control)
{
if (NodesSelection.Contains(clickedNode))
{
NodesSelection.Remove(clickedNode);
}
else
{
NodesSelection.Add(clickedNode);
}
}
InvalidateRow(NodeCollection.GetVisibleNodeIndex(clickedNode));
FocusedNode = clickedNode;
}
public void EnsureVisible(TreeListNode node)
{
int screenvisible = MaxVisibleRows() - 1;
int visibleIndex = NodeCollection.GetVisibleNodeIndex(node);
if (visibleIndex < VScrollValue())
{
SetVScrollValue(visibleIndex);
}
if (visibleIndex > VScrollValue() + screenvisible)
{
SetVScrollValue(visibleIndex - screenvisible);
}
}