protected virtual bool OnBeforeRemoveItemEvent(EntityObject item)
{
BeforeRemoveItemEventHandler ae = this.BeforeRemoveItem;
if (ae != null)
{
EntityCollectionEventArgs e = new EntityCollectionEventArgs(item);
ae(this, e);
return(e.Cancel);
}
return(false);
}
private void Entities_RemoveItem(EntityCollection sender, EntityCollectionEventArgs e)
{
if (this.readOnly) return;
if (e.Item.Type == EntityType.Hatch)
{
Hatch hatch = (Hatch)e.Item;
foreach (HatchBoundaryPath path in hatch.BoundaryPaths)
{
this.Hatch_BoundaryPathRemoved(hatch, new ObservableCollectionEventArgs<HatchBoundaryPath>(path));
}
hatch.HatchBoundaryPathAdded -= this.Hatch_BoundaryPathAdded;
hatch.HatchBoundaryPathRemoved -= this.Hatch_BoundaryPathRemoved;
}
this.OnEntityRemovedEvent(e.Item);
e.Item.Owner = null;
}
private void Entities_BeforeRemoveItem(EntityCollection sender, EntityCollectionEventArgs e)
{
// only items owned by the actual block can be removed
e.Cancel = !ReferenceEquals(e.Item.Owner, this) || this.readOnly;
}
private void Entities_BeforeAddItem(EntityCollection sender, EntityCollectionEventArgs e)
{
// null items, entities already owned by another Block, attribute definitions and attributes are not allowed in the entities list.
if (e.Item == null)
e.Cancel = true;
else if (this.entities.Contains(e.Item))
e.Cancel = true;
else if (this.readOnly)
e.Cancel = true;
else if (e.Item is AttributeDefinition)
e.Cancel = true;
else if (e.Item.Owner != null)
{
// if the block does not belong to a document, all entities which owner is not null will be rejected
if(this.Record.Owner == null)
e.Cancel = true;
// if the block belongs to a document, the entity will be added to the block only if both, the block and the entity document, are the same
// this is handled by the BlocksRecordCollection
}
else
e.Cancel = false;
}
private void Entities_AddItem(EntityCollection sender, EntityCollectionEventArgs e)
{
if (this.readOnly) return;
// if the entity is a hatch we will also add the boundary entities to the block
if (e.Item.Type == EntityType.Hatch)
{
Hatch hatch = (Hatch) e.Item;
foreach (HatchBoundaryPath path in hatch.BoundaryPaths)
{
this.Hatch_BoundaryPathAdded(hatch, new ObservableCollectionEventArgs<HatchBoundaryPath>(path));
}
hatch.HatchBoundaryPathAdded += this.Hatch_BoundaryPathAdded;
hatch.HatchBoundaryPathRemoved += this.Hatch_BoundaryPathRemoved;
}
this.OnEntityAddedEvent(e.Item);
e.Item.Owner = this;
}
private void Entities_RemoveItem(EntityCollection sender, EntityCollectionEventArgs e)
{
this.OnEntityRemovedEvent(e.Item);
}
private void Entities_AddItem(EntityCollection sender, EntityCollectionEventArgs e)
{
this.OnEntityAddedEvent(e.Item);
}
private void Entities_BeforeRemoveItem(EntityCollection sender, EntityCollectionEventArgs e)
{
}
private void Entities_BeforeAddItem(EntityCollection sender, EntityCollectionEventArgs e)
{
// null or duplicate items are not allowed in the entities list.
if (e.Item == null)
e.Cancel = true;
else if (this.entities.Contains(e.Item))
e.Cancel = true;
else
e.Cancel = false;
}
private void Entities_RemoveItem(EntityCollection sender, EntityCollectionEventArgs e)
{
e.Item.RemoveReactor(this);
this.OnEntityRemovedEvent(e.Item);
}
private void Entities_AddItem(EntityCollection sender, EntityCollectionEventArgs e)
{
e.Item.AddReactor(this);
this.OnEntityAddedEvent(e.Item);
}
private void Entities_RemoveItem(EntityCollection sender, EntityCollectionEventArgs e)
{
if (this.readOnly) return;
this.OnEntityRemovedEvent(e.Item);
e.Item.Owner = null;
}
private void Entities_AddItem(EntityCollection sender, EntityCollectionEventArgs e)
{
if (this.readOnly) return;
this.OnEntityAddedEvent(e.Item);
e.Item.Owner = this;
}
