/// <summary>
/// Event handler that is called when the watched node or a parent node below has disposed or its name changed. We then try to resolve the path again.
/// </summary>
/// <param name="sender"></param>
/// <param name="source">Source of the tunneled event.</param>
/// <param name="e"></param>
private void EhWatchedNode_TunneledEvent(object sender, object source, Main.TunnelingEventArgs e)
{
if (IsDisposeInProgress)
{
return;
}
if (!(InternalDocumentNode == null))
{
throw new InvalidProgramException();
}
var senderAsDocNode = sender as IDocumentLeafNode;
var sourceAsDocNode = source as IDocumentLeafNode;
if (!(senderAsDocNode != null))
{
throw new InvalidProgramException();
}
if (!(sourceAsDocNode != null))
{
throw new InvalidProgramException();
}
if (e is DocumentPathChangedEventArgs) // here, we activly change our stored path, if the watched node or a parent has changed its name
{
var watchedPath = AbsoluteDocumentPath.GetAbsolutePath(senderAsDocNode);
watchedPath = watchedPath.Append(_docNodePath.SubPath(watchedPath.Count, _docNodePath.Count - watchedPath.Count));
var oldPath = _docNodePath;
_docNodePath = watchedPath;
#if DEBUG_DOCNODEPROXYLOGGING
Current.Console.WriteLine("DocNodeProxy.EhWatchedNode_TunneledEvent: Modified path, oldpath={0}, newpath={1}", oldPath, _docNodePath);
#endif
}
// then we try to resolve the path again
if ((e is DisposeEventArgs) || (e is DocumentPathChangedEventArgs))
{
#if DEBUG_DOCNODEPROXYLOGGING
Current.Console.WriteLine("DocNodeProxy.EhWatchedNode_TunneledEvent");
#endif
var node = AbsoluteDocumentPath.GetNodeOrLeastResolveableNode(_docNodePath, sourceAsDocNode, out var wasResolvedCompletely);
if (null == node)
{
throw new InvalidProgramException(nameof(node) + " should always be != null, since we use absolute paths, and at least an AltaxoDocument should be resolved here.");
}
if (wasResolvedCompletely)
{
ClearWatch();
SetDocNode(node);
}
else // not completely resolved
{
if (!object.ReferenceEquals(sender, node))
{
ClearWatch();
SetWatchOnNode(node);
}
}
}
}
/// <summary>
/// Sets the watch on a node that is not our document node, but a node lower in the hierarchy. We watch both the Changed event and the TunneledEvent of this node.
/// </summary>
/// <param name="node">The node to watch.</param>
protected virtual void SetWatchOnNode(IDocumentLeafNode node)
{
if (null == node)
{
throw new ArgumentNullException(nameof(node));
}
if (null != _weakDocNodeChangedHandler)
{
_weakDocNodeChangedHandler.Remove();
_weakDocNodeChangedHandler = null;
}
if (null != _weakDocNodeTunneledEventHandler)
{
_weakDocNodeTunneledEventHandler.Remove();
_weakDocNodeTunneledEventHandler = null;
}
node.TunneledEvent += (_weakDocNodeTunneledEventHandler = new WeakActionHandler <object, object, TunnelingEventArgs>(EhWatchedNode_TunneledEvent, handler => node.TunneledEvent -= handler));
node.Changed += (_weakDocNodeChangedHandler = new WeakEventHandler(EhWatchedNode_Changed, handler => node.Changed -= handler));
#if DEBUG_DOCNODEPROXYLOGGING
Current.Console.WriteLine("Start watching node <<{0}>> of total path <<{1}>>", AbsoluteDocumentPath.GetAbsolutePath(node), _docNodePath);
#endif
}
/// <summary>
/// Sets the watch on a node that is not our document node, but a node lower in the hierarchy. We watch both the Changed event and the TunneledEvent of this node.
/// </summary>
/// <param name="node">The node to watch.</param>
protected virtual void SetWatchOnNode(IDocumentLeafNode node)
{
#if DOCNODEPROXY_CONCURRENTDEBUG
int debugUsn = System.Threading.Interlocked.Increment(ref _debugUSN);
_debug.Enqueue("START SetWatchOnNode " + debugUsn.ToString());
#endif
if (null == node)
{
throw new ArgumentNullException(nameof(node));
}
if (null != _weakDocNodeChangedHandler)
{
_weakDocNodeChangedHandler.Remove();
_weakDocNodeChangedHandler = null;
}
if (null != _weakDocNodeTunneledEventHandler)
{
_weakDocNodeTunneledEventHandler.Remove();
_weakDocNodeTunneledEventHandler = null;
}
node.TunneledEvent += (_weakDocNodeTunneledEventHandler = new WeakActionHandler <object, object, TunnelingEventArgs>(EhWatchedNode_TunneledEvent, handler => node.TunneledEvent -= handler));
node.Changed += (_weakDocNodeChangedHandler = new WeakEventHandler(EhWatchedNode_Changed, handler => node.Changed -= handler));
#if DEBUG_DOCNODEPROXYLOGGING
Current.Console.WriteLine("Start watching node <<{0}>> of total path <<{1}>>", AbsoluteDocumentPath.GetAbsolutePath(node), _docNodePath);
#endif
#if DOCNODEPROXY_CONCURRENTDEBUG
_debug.Enqueue("STOP SetWatchOnNode " + debugUsn.ToString() + (_docNodeRef == null).ToString());
#endif
}
