private void ContentPrepareChange(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
if (node != null)
{
var visitor = new GraphVisitorBase();
visitor.Visiting += UnregisterNode;
visitor.ShouldVisit = shouldRegisterNode;
switch (e.ChangeType)
{
case ContentChangeType.ValueChange:
// The changed node itself is still valid, we don't want to unregister it
visitor.SkipRootNode = true;
visitor.Visit(node);
break;
case ContentChangeType.CollectionRemove:
if (node.Content.IsReference && e.OldValue != null)
{
var removedNode = node.Content.Reference.AsEnumerable[e.Index].TargetNode;
if (removedNode != null)
{
visitor.Visit(removedNode);
}
}
break;
}
}
PrepareChange?.Invoke(sender, new GraphContentChangeEventArgs(e));
}
private void ContentPrepareChange(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
var path = GetPath(e.Content.OwnerNode);
if (node != null)
{
switch (e.ChangeType)
{
case ContentChangeType.ValueChange:
foreach (var child in node.GetAllChildNodes())
{
UnregisterNode(child.Item1);
}
break;
case ContentChangeType.CollectionRemove:
if (node.Content.IsReference && e.OldValue != null)
{
var removedNode = node.Content.Reference.AsEnumerable[e.Index].TargetNode;
if (removedNode != null)
{
foreach (var child in removedNode.GetAllChildNodes())
{
UnregisterNode(child.Item1);
}
UnregisterNode(removedNode);
}
}
break;
}
}
PrepareChange?.Invoke(sender, new GraphContentChangeEventArgs(e, path));
}
/// <summary>
/// Raises the <see cref="Changing"/> event with the given parameters.
/// </summary>
/// <param name="index">The index where the change occurred, if applicable. <c>null</c> otherwise.</param>
/// <param name="changeType">The type of change that occurred.</param>
/// <param name="oldValue">The old value of this content.</param>
/// <param name="newValue">The new value of this content.</param>
protected void NotifyContentChanging(object index, ContentChangeType changeType, object oldValue, object newValue)
{
var args = new ContentChangeEventArgs(this, index, changeType, oldValue, newValue);
PrepareChange?.Invoke(this, args);
Changing?.Invoke(this, args);
}
private void ContentPrepareChange(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
if (node != null)
{
foreach (var child in node.GetAllChildNodes())
{
UnregisterNode(child);
}
}
PrepareChange?.Invoke(sender, e);
}
private void ContentPrepareChange(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
var path = GetPath(e.Content.OwnerNode);
if (node != null)
{
foreach (var child in node.GetAllChildNodes())
{
UnregisterNode(child.Item1);
}
}
PrepareChange?.Invoke(sender, new GraphContentChangeEventArgs(e, path));
}
protected void NotifyItemChanging(ItemChangeEventArgs args)
{
PrepareChange?.Invoke(this, args);
ItemChanging?.Invoke(this, args);
}
/// <summary>
/// Raises the <see cref="ValueChanging"/> event with the given parameters.
/// </summary>
/// <param name="args">The arguments of the event.</param>
protected void NotifyContentChanging(MemberNodeChangeEventArgs args)
{
PrepareChange?.Invoke(this, args);
ValueChanging?.Invoke(this, args);
}
/// <summary>
/// Raises the <see cref="Changing"/> event with the given parameters.
/// </summary>
/// <param name="args">The arguments of the event.</param>
protected void NotifyContentChanging(ContentChangeEventArgs args)
{
PrepareChange?.Invoke(this, args);
Changing?.Invoke(this, args);
}