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//---------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
// File: IIndexedChild.cs
//
//---------------------------------------------------------------------------
using System.Windows.Documents;
namespace MS.Internal.Documents
{
/// <summary>
/// Classes comprising structure of <see cref="Table"/> are <see cref="TextElement"/> derived
/// classes, which are in parent-child containment relationship with each other.
/// For example TableRow contains collection of rows, each Row in turn contains collection of cells.
/// This interface should be implemented by the child types described above. see example section.
/// And Parent types should impelement <see cref="IAcceptInsertion"/>
/// <seealso cref="ContentElementCollection<TParent, TItem>"/>
/// </summary>
/// <example>
/// <see cref="TableCell"/> implements IIndexedChild with TParent == TableRow
/// whcih means cells are contained in a collection owned by <see cref="TableRow"/> type.
/// And <see cref="TableRow"/> in turn implements <see cref="IAcceptInsertion"/>
///
/// Note that <see cref="TableRow"/> also implements IIndexedChild with parent <see cref="TableRowGroup"/>
/// whcih means TableRow itself is contained in a collection owned by TableRowGroup.
/// </example>
/// <typeparam name="TParent"></typeparam>
internal interface IIndexedChild<TParent>
where TParent : TextElement
{
/// <summary>
/// Callback used to notify about entering parent's collection.
/// </summary>
void OnEnterParentTree();
/// <summary>
/// Callback used to notify about exitting parent's collection.
/// </summary>
void OnExitParentTree();
/// <summary>
/// Callback used to notify the RowGroup about exitting model tree.
/// </summary>
void OnAfterExitParentTree(TParent parent);
/// <summary>
/// Index of this object in the parent's collection.
/// </summary>
int Index
{ get; set; }
}
}
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