private void DraggingMonitorLoop()
{
const int scrollMargin = 8;
TreeNode lastOver = null;
int overItemCount = 0;
while (!abortThreads)
{
if (isDragging && dragginOverNode != null)
{
try {
if (draggingLocation.Y <= scrollMargin)
{
TreeViewItems.ScrollUp();
}
else if (draggingLocation.Y >= TreeViewItems.Height - scrollMargin)
{
TreeViewItems.ScrollDown();
}
else if (lastOver != dragginOverNode)
{
this.Invoke((MethodInvoker) delegate {
if (dragginOverNode.Nodes.Count > 0 && !dragginOverNode.IsExpanded)
{
lastOver = dragginOverNode;
overItemCount = 0;
}
else
{
lastOver = null;
}
});
}
else if (lastOver == dragginOverNode && lastOver != null && ++overItemCount >= 10)
{
this.Invoke((MethodInvoker) delegate {
dragginOverNode.Expand();
lastOver = null;
});
}
} catch { }
}
Thread.Sleep(100);
}
}
