/// <summary>
/// Switches the current center node for the one passed in as a parameter.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">Arguments describing the routed event.</param>
private static void OnSwitchCenterNodeCommand(object sender, ExecutedRoutedEventArgs e)
{
PhotoExplorerControl photoExplorer = sender as PhotoExplorerControl;
PhotoExplorerBaseNode nextNode = e.Parameter as PhotoExplorerBaseNode;
var pNode = nextNode as PhotoExplorerPhotoNode;
PhotoExplorerBaseNode overrideNode = null;
if (pNode != null)
{
if (pNode.Photo != null)// && pNode.Photo.PhotoUrlBig.Contains("profile"))
{
if (pNode.RelatedNodes.Count == 1)
{
overrideNode = pNode.RelatedNodes[0];
}
}
}
if (photoExplorer != null && nextNode != null)
{
if (nextNode == photoExplorer.CenterNode)
{
if (photoExplorer.CenterNode.Content != null)
{
ServiceProvider.ViewManager.NavigationCommands.NavigateToContentCommand.Execute(photoExplorer.CenterNode.Content);
}
}
else
{
photoExplorer.CenterNode = overrideNode ?? nextNode;
}
}
}
/// <summary>
/// Removes the collection changed handler from the old center node's related nodes collection when the center node changes.
/// </summary>
/// <param name="args">Arguments describing the change event.</param>
private void CenterNodePropertyChanged(DependencyPropertyChangedEventArgs args)
{
PhotoExplorerBaseNode oldNode = args.OldValue as PhotoExplorerBaseNode;
if (oldNode != null)
{
oldNode.RelatedNodes.CollectionChanged -= new NotifyCollectionChangedEventHandler(this.OnRelatedNodesCollectionChanged);
}
PhotoExplorerBaseNode newNode = args.NewValue as PhotoExplorerBaseNode;
if (newNode != null)
{
newNode.RelatedNodes.CollectionChanged += new NotifyCollectionChangedEventHandler(this.OnRelatedNodesCollectionChanged);
}
this.UpdateDisplayedNodes();
}
