/// <summary>
/// Raises the <see cref="Changed"/> 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 NotifyContentChanged(object index, ContentChangeType changeType, object oldValue, object newValue)
{
var args = new ContentChangeEventArgs(this, index, changeType, oldValue, newValue);
Changed?.Invoke(this, args);
FinalizeChange?.Invoke(this, args);
}
/// <inheritdoc/>
public override void Add(object newItem)
{
var collectionDescriptor = Descriptor as CollectionDescriptor;
if (collectionDescriptor != null)
{
// Some collection (such as sets) won't add item at the end but at an arbitrary location.
// Better send a null index in this case than sending a wrong value.
var value = Value;
var index = collectionDescriptor.IsList ? new Index(collectionDescriptor.GetCollectionCount(value)) : Index.Empty;
var args = new ContentChangeEventArgs(this, index, ContentChangeType.CollectionAdd, null, newItem);
NotifyContentChanging(args);
collectionDescriptor.Add(value, newItem);
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
else
{
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
}
public AssetContentChangeEventArgs(ContentChangeEventArgs e, OverrideType previousOverride, OverrideType newOverride, ItemId itemId)
: base(e.Content, e.Index, e.ChangeType, e.OldValue, e.NewValue)
{
PreviousOverride = previousOverride;
NewOverride = newOverride;
ItemId = itemId;
}
/// <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(Index 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 ContentChanged(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
if (node != null)
{
foreach (var child in GetAllChildNodes(node))
{
child.Content.Changing += ContentChanging;
child.Content.Changed += ContentChanged;
}
}
Changed?.Invoke(sender, e);
}
private void Update(object newValue, Index index, bool sendNotification)
{
var oldValue = Retrieve(index);
ContentChangeEventArgs args = null;
if (sendNotification)
{
args = new ContentChangeEventArgs(this, index, ContentChangeType.ValueChange, oldValue, newValue);
NotifyContentChanging(args);
}
if (!index.IsEmpty)
{
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
if (collectionDescriptor != null)
{
collectionDescriptor.SetValue(Value, index.Int, newValue);
}
else if (dictionaryDescriptor != null)
{
dictionaryDescriptor.SetValue(Value, index.Value, newValue);
}
else
{
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
}
else
{
if (Container.Value == null)
{
throw new InvalidOperationException("Container's value is null");
}
var containerValue = Container.Value;
Member.Set(containerValue, newValue);
if (Container.Value.GetType().GetTypeInfo().IsValueType)
{
Container.UpdateFromMember(containerValue, Index.Empty);
}
}
UpdateReferences();
if (sendNotification)
{
NotifyContentChanged(args);
}
}
/// <inheritdoc/>
public override void Add(object newItem, Index itemIndex)
{
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
if (collectionDescriptor != null)
{
var index = collectionDescriptor.IsList ? itemIndex : Index.Empty;
var value = Value;
var args = new ContentChangeEventArgs(this, index, ContentChangeType.CollectionAdd, null, newItem);
NotifyContentChanging(args);
if (collectionDescriptor.GetCollectionCount(value) == itemIndex.Int || !collectionDescriptor.HasInsert)
{
collectionDescriptor.Add(value, newItem);
}
else
{
collectionDescriptor.Insert(value, itemIndex.Int, newItem);
}
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
else if (dictionaryDescriptor != null)
{
var args = new ContentChangeEventArgs(this, itemIndex, ContentChangeType.CollectionAdd, null, newItem);
NotifyContentChanging(args);
var value = Value;
dictionaryDescriptor.AddToDictionary(value, itemIndex.Value, newItem);
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
else
{
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
}
/// <inheritdoc/>
public override void Add(object newItem, Index itemIndex)
{
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
if (collectionDescriptor != null)
{
var index = collectionDescriptor.IsList ? itemIndex : Index.Empty;
var value = Value;
var args = new ContentChangeEventArgs(this, index, ContentChangeType.CollectionAdd, null, newItem);
NotifyContentChanging(args);
if (collectionDescriptor.GetCollectionCount(value) == itemIndex.Int || !collectionDescriptor.HasInsert)
{
collectionDescriptor.Add(value, newItem);
}
else
{
collectionDescriptor.Insert(value, itemIndex.Int, newItem);
}
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
else if (dictionaryDescriptor != null)
{
var args = new ContentChangeEventArgs(this, itemIndex, ContentChangeType.CollectionAdd, null, newItem);
NotifyContentChanging(args);
var value = Value;
dictionaryDescriptor.AddToDictionary(value, itemIndex.Value, newItem);
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
else
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
/// <inheritdoc/>
public override void Remove(object item, Index itemIndex)
{
if (itemIndex.IsEmpty)
{
throw new ArgumentException(@"The given index should not be empty.", nameof(itemIndex));
}
var args = new ContentChangeEventArgs(this, itemIndex, ContentChangeType.CollectionRemove, item, null);
NotifyContentChanging(args);
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
var value = Value;
if (collectionDescriptor != null)
{
if (collectionDescriptor.HasRemoveAt)
{
collectionDescriptor.RemoveAt(value, itemIndex.Int);
}
else
{
collectionDescriptor.Remove(value, item);
}
}
else if (dictionaryDescriptor != null)
{
dictionaryDescriptor.Remove(value, itemIndex.Value);
}
else
{
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
/// <inheritdoc/>
public override void Add(object newItem)
{
var collectionDescriptor = Descriptor as CollectionDescriptor;
if (collectionDescriptor != null)
{
// Some collection (such as sets) won't add item at the end but at an arbitrary location.
// Better send a null index in this case than sending a wrong value.
var value = Value;
var index = collectionDescriptor.IsList ? new Index(collectionDescriptor.GetCollectionCount(value)) : Index.Empty;
var args = new ContentChangeEventArgs(this, index, ContentChangeType.CollectionAdd, null, newItem);
NotifyContentChanging(args);
collectionDescriptor.Add(value, newItem);
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
else
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
/// <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);
}
private void Update(object newValue, Index index, bool sendNotification)
{
var oldValue = Retrieve(index);
ContentChangeEventArgs args = null;
if (sendNotification)
{
args = new ContentChangeEventArgs(this, index, ContentChangeType.ValueChange, oldValue, newValue);
NotifyContentChanging(args);
}
if (!index.IsEmpty)
{
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
if (collectionDescriptor != null)
{
collectionDescriptor.SetValue(Value, index.Int, newValue);
}
else if (dictionaryDescriptor != null)
{
dictionaryDescriptor.SetValue(Value, index.Value, newValue);
}
else
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
}
else
{
if (Container.Value == null) throw new InvalidOperationException("Container's value is null");
var containerValue = Container.Value;
Member.Set(containerValue, newValue);
if (Container.Value.GetType().GetTypeInfo().IsValueType)
Container.UpdateFromMember(containerValue, Index.Empty);
}
UpdateReferences();
if (sendNotification)
{
NotifyContentChanged(args);
}
}
private void ContentChanged(object sender, ContentChangeEventArgs e)
{
var path = GetPath(e.Content.OwnerNode);
Changed?.Invoke(sender, new GraphContentChangeEventArgs(e, path));
}
private void ContentPrepareChange(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
var path = GetPath(e.Content.OwnerNode);
if (node != null)
{
var visitor = new GraphVisitorBase();
visitor.Visiting += UnregisterNode;
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, path);
break;
case ContentChangeType.CollectionRemove:
if (node.Content.IsReference && e.OldValue != null)
{
var removedNode = node.Content.Reference.AsEnumerable[e.Index].TargetNode;
var removedNodePath = path?.PushIndex(e.Index);
if (removedNode != null)
{
visitor.Visit(removedNode, removedNodePath);
}
}
break;
}
}
PrepareChange?.Invoke(sender, new GraphContentChangeEventArgs(e, path));
}
private void ContentFinalizeChange(object sender, ContentChangeEventArgs e)
{
var node = e.Content.OwnerNode as IGraphNode;
var path = GetPath(e.Content.OwnerNode);
if (node != null)
{
var visitor = new GraphVisitorBase();
visitor.Visiting += RegisterNode;
switch (e.ChangeType)
{
case ContentChangeType.ValueChange:
// The changed node itself is still valid, we don't want to re-register it
visitor.SkipRootNode = true;
visitor.Visit(node, path);
break;
case ContentChangeType.CollectionAdd:
if (node.Content.IsReference && e.NewValue != null)
{
var index = e.Index;
IGraphNode addedNode;
if (!index.IsEmpty)
{
addedNode = node.Content.Reference.AsEnumerable[e.Index].TargetNode;
}
else
{
var reference = node.Content.Reference.AsEnumerable.First(x => x.TargetNode.Content.Retrieve() == e.NewValue);
index = reference.Index;
addedNode = reference.TargetNode;
}
if (addedNode != null)
{
var addedNodePath = path?.PushIndex(index);
visitor.Visit(addedNode, addedNodePath);
}
}
break;
}
}
FinalizeChange?.Invoke(sender, new GraphContentChangeEventArgs(e, path));
}
/// <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);
}
private void ContentChanged(object sender, ContentChangeEventArgs e)
{
Changed?.Invoke(sender, new GraphContentChangeEventArgs(e));
}
/// <inheritdoc/>
public override void Remove(object item, Index itemIndex)
{
if (itemIndex.IsEmpty) throw new ArgumentException(@"The given index should not be empty.", nameof(itemIndex));
var args = new ContentChangeEventArgs(this, itemIndex, ContentChangeType.CollectionRemove, item, null);
NotifyContentChanging(args);
var collectionDescriptor = Descriptor as CollectionDescriptor;
var dictionaryDescriptor = Descriptor as DictionaryDescriptor;
var value = Value;
if (collectionDescriptor != null)
{
if (collectionDescriptor.HasRemoveAt)
{
collectionDescriptor.RemoveAt(value, itemIndex.Int);
}
else
{
collectionDescriptor.Remove(value, item);
}
}
else if (dictionaryDescriptor != null)
{
dictionaryDescriptor.Remove(value, itemIndex.Value);
}
else
throw new NotSupportedException("Unable to set the node value, the collection is unsupported");
if (value.GetType().GetTypeInfo().IsValueType)
{
var containerValue = Container.Value;
Member.Set(containerValue, value);
}
UpdateReferences();
NotifyContentChanged(args);
}
/// <summary>
/// Raises the <see cref="Changed"/> event with the given arguments.
/// </summary>
/// <param name="args">The arguments of the event.</param>
protected void NotifyContentChanged(ContentChangeEventArgs args)
{
Changed?.Invoke(this, args);
FinalizeChange?.Invoke(this, args);
}
/// <summary>
/// Raises the <see cref="Changed"/> event with the given arguments.
/// </summary>
/// <param name="args">The arguments of the event.</param>
protected void NotifyContentChanged(ContentChangeEventArgs args)
{
Changed?.Invoke(this, args);
FinalizeChange?.Invoke(this, args);
}
/// <summary>
/// Raises the <see cref="Changed"/> event with the given parameters.
/// </summary>
/// <param name="index">The index where the change occurred, if applicable. <c>null</c> otherwise.</param>
/// <param name="oldValue">The old value of this content.</param>
/// <param name="newValue">The new value of this content.</param>
protected void NotifyContentChanged(object index, object oldValue, object newValue)
{
var args = new ContentChangeEventArgs(this, index, oldValue, newValue);
Changed?.Invoke(this, args);
FinalizeChange?.Invoke(this, args);
}
/// <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="oldValue">The old value of this content.</param>
/// <param name="newValue">The new value of this content.</param>
protected void NotifyContentChanging(object index, object oldValue, object newValue)
{
var args = new ContentChangeEventArgs(this, index, oldValue, newValue);
PrepareChange?.Invoke(this, args);
Changing?.Invoke(this, args);
}
private void ContentChanged(object sender, ContentChangeEventArgs e)
{
Changed?.Invoke(sender, e);
}
private void ContentChanged(object sender, ContentChangeEventArgs e)
{
// Make sure that we have item ids everywhere we're supposed to.
AssetCollectionItemIdHelper.GenerateMissingItemIds(e.Content.Retrieve());
var node = (AssetNode)e.Content.OwnerNode;
if (node.IsNonIdentifiableCollectionContent)
return;
// Create new ids for collection items
var baseNode = (AssetNode)BaseContent?.OwnerNode;
var isOverriding = !baseNode?.contentUpdating == true;
var removedId = ItemId.Empty;
switch (e.ChangeType)
{
case ContentChangeType.ValueChange:
break;
case ContentChangeType.CollectionAdd:
{
var collectionDescriptor = e.Content.Descriptor as CollectionDescriptor;
var itemIds = CollectionItemIdHelper.GetCollectionItemIds(e.Content.Retrieve());
// Compute the id we will add for this item
ItemId itemId;
if (baseNode?.contentUpdating == true)
{
var baseCollection = baseNode.Content.Retrieve();
var baseIds = CollectionItemIdHelper.GetCollectionItemIds(baseCollection);
itemId = itemIds.FindMissingId(baseIds);
}
else
{
itemId = restoringId != ItemId.Empty ? restoringId : ItemId.New();
}
// Add the id to the proper location (insert or add)
if (collectionDescriptor != null)
{
if (e.Index != Index.Empty)
{
itemIds.Insert(e.Index.Int, itemId);
}
else
{
throw new InvalidOperationException("An item has been added to a collection that does not have a predictable Add. Consider using NonIdentifiableCollectionItemsAttribute on this collection.");
}
}
else
{
itemIds[e.Index.Value] = itemId;
}
}
break;
case ContentChangeType.CollectionRemove:
{
var collectionDescriptor = e.Content.Descriptor as CollectionDescriptor;
if (collectionDescriptor != null)
{
var itemIds = CollectionItemIdHelper.GetCollectionItemIds(e.Content.Retrieve());
removedId = itemIds.DeleteAndShift(e.Index.Int, isOverriding);
}
else
{
var itemIds = CollectionItemIdHelper.GetCollectionItemIds(e.Content.Retrieve());
removedId = itemIds.Delete(e.Index.Value, isOverriding);
}
}
break;
default:
throw new ArgumentOutOfRangeException();
}
// Don't update override if propagation from base is disabled.
if (PropertyGraph?.Container?.PropagateChangesFromBase == false)
return;
// Mark it as New if it does not come from the base
if (!baseNode?.contentUpdating == true && !ResettingOverride)
{
if (e.ChangeType != ContentChangeType.CollectionRemove)
{
if (e.Index == Index.Empty)
{
OverrideContent(!ResettingOverride);
}
else
{
OverrideItem(!ResettingOverride, e.Index);
}
}
else
{
OverrideDeletedItem(true, removedId);
}
}
}
private void AssetContentChanged(object sender, ContentChangeEventArgs e)
{
var previousOverride = previousOverrides[e.Content.OwnerNode];
previousOverrides.Remove(e.Content.OwnerNode);
var itemId = ItemId.Empty;
var overrideValue = OverrideType.Base;
var node = (AssetNode)e.Content.OwnerNode;
if (e.ChangeType == ContentChangeType.ValueChange || e.ChangeType == ContentChangeType.CollectionAdd)
{
if (e.Index == Index.Empty)
{
// No index, we're changing an object that is not in a collection, let's just retrieve it's override status.
overrideValue = node.GetContentOverride();
}
else
{
// We're changing an item of a collection. If the collection has identifiable items, retrieve the override status of the item.
if (!node.IsNonIdentifiableCollectionContent)
{
overrideValue = node.GetItemOverride(e.Index);
}
// Also retrieve the id of the modified item (this should fail only if the collection doesn't have identifiable items)
CollectionItemIdentifiers ids;
if (CollectionItemIdHelper.TryGetCollectionItemIds(e.Content.Retrieve(), out ids))
{
ids.TryGet(e.Index.Value, out itemId);
}
}
}
else
{
// When deleting we are always overriding (unless there is no base)
overrideValue = !((AssetNode)node.BaseContent?.OwnerNode)?.contentUpdating == true ? OverrideType.New : OverrideType.Base;
itemId = removedItemIds[e.Content.OwnerNode];
removedItemIds.Remove(e.Content.OwnerNode);
}
Changed?.Invoke(sender, new AssetContentChangeEventArgs(e, previousOverride, overrideValue, itemId));
}
private void OnBaseContentChanged(ContentChangeEventArgs e, IContent assetContent)
{
// Ignore base change if propagation is disabled.
if (!Container.PropagateChangesFromBase)
return;
UpdatingPropertyFromBase = true;
// TODO: we want to refresh the base only starting from the modified node!
RefreshBase(baseGraph);
var rootNode = (AssetNode)assetContent.OwnerNode;
var visitor = CreateReconcilierVisitor();
visitor.Visiting += (node, path) => ReconcileWithBaseNode((AssetNode)node);
visitor.Visit(rootNode);
UpdatingPropertyFromBase = false;
BaseContentChanged?.Invoke(e, assetContent);
}
private void ContentChanged(object sender, ContentChangeEventArgs e)
{
if (!updatingValue)
OnPropertyChanged(nameof(VirtualObservableNode<object>.TypedValue));
}
private void AssetContentChanging(object sender, ContentChangeEventArgs e)
{
var overrideValue = OverrideType.Base;
var node = (AssetNode)e.Content.OwnerNode;
if (e.ChangeType == ContentChangeType.ValueChange || e.ChangeType == ContentChangeType.CollectionRemove)
{
// For value change and remove, we store the current override state.
if (e.Index == Index.Empty)
{
overrideValue = node.GetContentOverride();
}
else if (!node.IsNonIdentifiableCollectionContent)
{
overrideValue = node.GetItemOverride(e.Index);
}
}
if (e.ChangeType == ContentChangeType.CollectionRemove)
{
// For remove, we also collect the id of the item that will be removed, so we can pass it to the Changed event.
var itemId = ItemId.Empty;
CollectionItemIdentifiers ids;
if (CollectionItemIdHelper.TryGetCollectionItemIds(e.Content.Retrieve(), out ids))
{
ids.TryGet(e.Index.Value, out itemId);
}
removedItemIds[e.Content.OwnerNode] = itemId;
}
if (e.ChangeType == ContentChangeType.CollectionAdd && !node.IsNonIdentifiableCollectionContent)
{
// If the change is an add, we set the previous override as New so the Undo will try to remove the item instead of resetting to the base value
previousOverrides[e.Content.OwnerNode] = OverrideType.New;
}
previousOverrides[e.Content.OwnerNode] = overrideValue;
}
