//-------------------------------------------------------------------
//
// Constructors
//
//-------------------------------------------------------------------
#region Constructors
/// <summary>
/// </summary>
/// <param name="owner">
/// Owner of this TextElementCollection.
/// In case when a collection is created for children of a parent, owner is the parent object.
/// In case when a collection is created as a sibling collection of a TextElement, owner is that TextElement object.
/// This distinction is very important, so that a collection belongs semantically to the owner it was created for.
/// </param>
/// <param name="isOwnerParent">
/// Flag indicating if the owner is a parent of objects in this collection or is a member object.
/// </param>
internal TextElementCollection(DependencyObject owner, bool isOwnerParent)
{
if (isOwnerParent)
{
Invariant.Assert(owner is TextElement || owner is FlowDocument || owner is TextBlock);
}
else
{
Invariant.Assert(owner is TextElement);
}
_owner = owner;
_isOwnerParent = isOwnerParent;
_indexCache = new ElementIndexCache(-1, null);
}
// Sets the element/index cache.
private void SetCache(int index, TextElementType item)
{
_indexCache = new ElementIndexCache(index, item);
TextElementCollectionHelper.MarkClean(this.Parent, this);
}
