protected override void OnAfterCheck(TreeViewEventArgs e)
{
base.OnAfterCheck(e);
if (this.UseThreeStateCheckBoxes)
{
switch (e.Action)
{
case TreeViewAction.ByKeyboard:
case TreeViewAction.ByMouse:
{
if (e.Node is ThreeStateTreeNode)
{
ThreeStateTreeNode tn = e.Node as ThreeStateTreeNode;
tn.Toggle();
}
break;
}
case TreeViewAction.Collapse:
case TreeViewAction.Expand:
case TreeViewAction.Unknown:
default:
{
break;
}
}
}
}
private void UpdateParentNodeState(bool isStartingPoint)
{
ThreeStateTreeNode parent = this.Parent as ThreeStateTreeNode;
if (parent != null)
{
Enumerations.CheckBoxState state = Enumerations.CheckBoxState.Unchecked;
if (!isStartingPoint && (this.State == Enumerations.CheckBoxState.Indeterminate))
{
state = Enumerations.CheckBoxState.Indeterminate;
}
else
{
state = this.SiblingsState;
}
if (parent.State != state)
{
parent.State = state;
parent.Checked = (state != Enumerations.CheckBoxState.Unchecked);
parent.UpdateParentNodeState(false);
}
}
}
