private void DomNode_AttributeChanging(object sender, AttributeEventArgs e)
{
ITimelineObject item = e.DomNode.As <ITimelineObject>();
if (item != null)
{
if (!IsEditable(item, e.AttributeInfo))
{
if (ActiveDocument.Cast <ITransactionContext>().InTransaction)
{
throw new InvalidTransactionException("timeline object can't be edited");
}
else
{
return;
}
}
// Check if a URI on a timeline reference has changed, so we can unload
// old document and load new document.
if (e.AttributeInfo.Equivalent(Schema.timelineRefType.refAttribute))
{
UnloadSubDocument((Uri)e.OldValue);
LoadSubDocument((Uri)e.NewValue);
}
}
}
