protected void ItemsModel3D_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Reset:
OctreeManager?.Clear();
OctreeManager?.RequestRebuild();
break;
}
switch (e.Action)
{
case NotifyCollectionChangedAction.Replace:
case NotifyCollectionChangedAction.Remove:
if (e.OldItems != null)
{
foreach (var item in e.OldItems)
{
if (mDictionary.ContainsKey(item))
{
var model = mDictionary[item];
if (model is GeometryModel3D)
{
OctreeManager?.RemoveItem(model as GeometryModel3D);
}
model.DataContext = null;
this.Children.Remove(model);
mDictionary.Remove(item);
}
}
InvalidateRender();
}
break;
case NotifyCollectionChangedAction.Reset:
var array = this.Children.ToArray();
foreach (var item in array)
{
item.DataContext = null;
this.Children.Remove(item);
}
mDictionary.Clear();
break;
}
switch (e.Action)
{
case NotifyCollectionChangedAction.Reset:
if (this.ItemsSource != null)
{
if (this.ItemTemplate == null)
{
foreach (var item in this.ItemsSource)
{
var model = item as Model3D;
if (model != null)
{
this.Children.Add(model);
mDictionary.Add(item, model);
}
else
{
throw new InvalidOperationException("Cannot create a Model3D from ItemTemplate.");
}
}
}
else
{
foreach (var item in this.ItemsSource)
{
var model = this.ItemTemplate.LoadContent() as Model3D;
if (model != null)
{
model.DataContext = item;
this.Children.Add(model);
mDictionary.Add(item, model);
}
else
{
throw new InvalidOperationException("Cannot create a Model3D from ItemTemplate.");
}
}
}
}
InvalidateRender();
break;
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Replace:
if (e.NewItems != null)
{
if (this.ItemTemplate != null)
{
foreach (var item in e.NewItems)
{
if (mDictionary.ContainsKey(item))
{
continue;
}
var model = this.ItemTemplate.LoadContent() as Model3D;
if (model != null)
{
OctreeManager?.AddPendingItem(model);
model.DataContext = item;
this.Children.Add(model);
mDictionary.Add(item, model);
}
else
{
throw new InvalidOperationException("Cannot create a Model3D from ItemTemplate.");
}
}
}
else
{
foreach (var item in e.NewItems)
{
if (mDictionary.ContainsKey(item))
{
continue;
}
var model = item as Model3D;
if (model != null)
{
OctreeManager?.AddPendingItem(model);
this.Children.Add(model);
mDictionary.Add(item, model);
}
else
{
throw new InvalidOperationException("Cannot create a Model3D from ItemTemplate.");
}
}
}
}
break;
}
}
private void NodeGroup_OnClear(object sender, OnChildNodeChangedArgs e)
{
OctreeManager?.Clear();
OctreeManager?.RequestRebuild();
}
/// <summary>
/// Handles changes in the ItemsSource property.
/// </summary>
/// <param name="e">
/// The <see cref="DependencyPropertyChangedEventArgs"/> instance containing the event data.
/// </param>
/// <exception cref="System.InvalidOperationException">
/// Cannot create a Model3D from ItemTemplate.
/// </exception>
private void ItemsSourceChanged(DependencyPropertyChangedEventArgs e)
{
if (e.OldValue is INotifyCollectionChanged)
{
(e.OldValue as INotifyCollectionChanged).CollectionChanged -= ItemsModel3D_CollectionChanged;
}
foreach (Model3D item in Children)
{
item.DataContext = null;
}
OctreeManager?.Clear();
mDictionary.Clear();
Children.Clear();
if (e.NewValue is INotifyCollectionChanged)
{
(e.NewValue as INotifyCollectionChanged).CollectionChanged -= ItemsModel3D_CollectionChanged;
(e.NewValue as INotifyCollectionChanged).CollectionChanged += ItemsModel3D_CollectionChanged;
}
if (ItemsSource == null)
{
return;
}
if (this.ItemTemplate == null)
{
foreach (var item in this.ItemsSource)
{
if (mDictionary.ContainsKey(item))
{
continue;
}
var model = item as Model3D;
if (model != null)
{
this.Children.Add(model);
mDictionary.Add(item, model);
}
else
{
throw new InvalidOperationException("Cannot create a Model3D from ItemTemplate.");
}
}
}
else
{
foreach (var item in this.ItemsSource)
{
if (mDictionary.ContainsKey(item))
{
continue;
}
var model = this.ItemTemplate.LoadContent() as Model3D;
if (model != null)
{
model.DataContext = item;
this.Children.Add(model);
mDictionary.Add(item, model);
}
else
{
throw new InvalidOperationException("Cannot create a Model3D from ItemTemplate.");
}
}
}
if (Children.Count > 0)
{
OctreeManager?.RequestRebuild();
}
}