/// <summary>
/// This method is only called when a node's state has been changed through the
/// Checked property
/// </summary>
/// <param name="oldState">Previous state</param>
/// <param name="newState">New state</param>
private void CheckStateChanged(CheckState oldState, CheckState newState)
{
// States are equal?
if (newState != oldState)
{
// not equal.
// modify state
this._nodeCheckState = newState;
// change state of the children
if (this.Nodes != null && this.Nodes.Count > 0)
{
foreach (System.Windows.Forms.TreeNode node in this.Nodes)
{
TriStateTreeNode tsNode = node as TriStateTreeNode;
if (tsNode != null)
{
tsNode.ChangeChildState(newState);
}
}
}
// notify the parent of the changed state.
if (this.Parent != null)
{
TriStateTreeNode parentNode = this.Parent as TriStateTreeNode;
if (parentNode != null)
{
parentNode.ChildCheckStateChanged(this._nodeCheckState);
}
}
}
}
/// <summary>
/// This method is only called by other nodes so it can be private.
/// Changes state of the node to the state provided.
/// </summary>
/// <param name="newState"></param>
private void ChangeChildState(CheckState newState)
{
// change state
this._nodeCheckState = newState;
// change state on the children
if (this.Nodes != null && this.Nodes.Count > 0)
{
foreach (System.Windows.Forms.TreeNode node in this.Nodes)
{
TriStateTreeNode tsNode = node as TriStateTreeNode;
if (tsNode != null)
{
tsNode.ChangeChildState(newState);
}
}
}
}