private bool WalkNodes(TreeNode node)
{
// Fire the ProcessNode event.
ProcessNodeEventArgs args = ProcessNodeEventArgs.CreateInstance(node);
this.OnProcessNode(args);
// Cache the value of ProcessSiblings since ProcessNodeEventArgs is a singleton.
bool processSiblings = args.ProcessSiblings;
if (args.StopProcessing)
{
this.stopProcessing = true;
}
else if (args.ProcessDescendants)
{
for (int i = 0; i < node.Nodes.Count; ++i)
{
if (!this.WalkNodes(node.Nodes[i]) || this.stopProcessing)
{
break;
}
}
}
return(processSiblings);
}
/// <summary>
/// Raises the ProcessNode event.
/// </summary>
/// <param name="e">The event argument.</param>
protected virtual void OnProcessNode(ProcessNodeEventArgs e)
{
ProcessNodeEventHandler handler = this.ProcessNode;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// This method ensures that the ProcessNodeEventArgs class is a singleton. Making this class
/// a singleton prevents multiple instances from being created, which could help to prevent
/// heap fragmentation when the tree being navigated has hundreds or thousands of nodes.
/// </summary>
/// <param name="node">The node to be exposed by the event argument.</param>
internal static ProcessNodeEventArgs CreateInstance(TreeNode node)
{
if (ProcessNodeEventArgs.instance == null)
{
ProcessNodeEventArgs.instance = new ProcessNodeEventArgs();
}
ProcessNodeEventArgs.instance.node = node;
ProcessNodeEventArgs.instance.processDescendants = true;
ProcessNodeEventArgs.instance.processSiblings = true;
ProcessNodeEventArgs.instance.stopProcessing = false;
return(ProcessNodeEventArgs.instance);
}
/// <summary>
/// Raises the ProcessNode event.
/// </summary>
/// <param name="e">The event argument.</param>
protected virtual void OnProcessNode(ProcessNodeEventArgs e)
{
ProcessNodeEventHandler handler = this.ProcessNode;
if (handler != null)
handler(this, e);
}
private void treeViewWalker_ProcessNode_HighlightMatchingNodes(object sender, ProcessNodeEventArgs e)
{
if (e.Node.Text.ToLower(CultureInfo.CurrentCulture).IndexOf(textBox1.Text.ToLower(CultureInfo.CurrentCulture), StringComparison.CurrentCultureIgnoreCase) > -1)
{
e.Node.BackColor = Color.Yellow;
e.Node.ForeColor = Color.Red;
e.Node.Expand();
}
//treeViewWalker.ProcessNode -= new ProcessNodeEventHandler(treeViewWalker_ProcessNode_HighlightMatchingNodes);
}
/// <summary>
/// This method ensures that the ProcessNodeEventArgs class is a singleton. Making this class
/// a singleton prevents multiple instances from being created, which could help to prevent
/// heap fragmentation when the tree being navigated has hundreds or thousands of nodes.
/// </summary>
/// <param name="node">The node to be exposed by the event argument.</param>
internal static ProcessNodeEventArgs CreateInstance(TreeNode node)
{
if (ProcessNodeEventArgs.instance == null)
ProcessNodeEventArgs.instance = new ProcessNodeEventArgs();
ProcessNodeEventArgs.instance.node = node;
ProcessNodeEventArgs.instance.processDescendants = true;
ProcessNodeEventArgs.instance.processSiblings = true;
ProcessNodeEventArgs.instance.stopProcessing = false;
return ProcessNodeEventArgs.instance;
}
