public override void MouseDown(TreeNodeAdvMouseEventArgs args)
{
if (args.Node != null)
{
Tree.ItemDragMode = true;
Tree.ItemDragStart = args.ViewLocation;
if (args.Button == MouseButtons.Left || args.Button == MouseButtons.Right)
{
Tree.BeginUpdate();
try
{
Tree.CurrentNode = args.Node;
if (args.Node.IsSelected)
_mouseDownFlag = true;
else
{
_mouseDownFlag = false;
DoMouseOperation(args);
}
}
finally
{
Tree.EndUpdate();
}
}
}
else
{
Tree.ItemDragMode = false;
MouseDownAtEmptySpace(args);
}
}
protected override void DoMouseOperation(TreeNodeAdvMouseEventArgs args)
{
if (Tree.SelectionMode == TreeSelectionMode.Single || Tree.SelectionStart == null)
{
base.DoMouseOperation(args);
}
else if (CanSelect(args.Node))
{
Tree.SuspendSelectionEvent = true;
try
{
SelectAllFromStart(args.Node);
}
finally
{
Tree.SuspendSelectionEvent = false;
}
}
}
protected virtual void MouseDownAtEmptySpace(TreeNodeAdvMouseEventArgs args)
{
Tree.ClearSelection();
}
protected virtual void DoMouseOperation(TreeNodeAdvMouseEventArgs args)
{
Tree.SuspendSelectionEvent = true;
try
{
Tree.ClearSelection();
if (args.Node != null)
args.Node.IsSelected = true;
Tree.SelectionStart = args.Node;
}
finally
{
Tree.SuspendSelectionEvent = false;
}
}
public override void MouseUp(TreeNodeAdvMouseEventArgs args)
{
Tree.ItemDragMode = false;
if (_mouseDownFlag)
{
if (args.Button == MouseButtons.Left)
DoMouseOperation(args);
else if (args.Button == MouseButtons.Right)
Tree.CurrentNode = args.Node;
}
_mouseDownFlag = false;
}
public override void MouseUp(TreeNodeAdvMouseEventArgs args)
{
FinishResize();
}
public override void MouseDown(TreeNodeAdvMouseEventArgs args)
{
}
protected override void MouseDownAtEmptySpace(TreeNodeAdvMouseEventArgs args)
{
}
public abstract void MouseUp(TreeNodeAdvMouseEventArgs args);