// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
// 
// Description: Collection of Block elements
//    Collection of Block elements - elements allowed as children
//    of FlowDocument, Section, ListItem, TableCell, Floater and Figure.
//
 
namespace System.Windows.Documents
{
    using MS.Internal; // Invariant
 
    /// <summary>
    /// Collection of Block elements - elements allowed as children
    /// of FlowDocument, Section, ListItem, TableCell, Floater and Figure.
    /// </summary>
    public class BlockCollection : TextElementCollection<Block>
    {
        //-------------------------------------------------------------------
        //
        //  Constructors
        //
        //-------------------------------------------------------------------
 
        #region Constructors
 
        // Constructor is internal. We allow BlockCollection creation only from inside owning elements such as FlowDocument or TextElement.
        // Note that when a SiblingBlocks collection is created for a Block, the owner of collection is that member Block object.
        // Flag isOwnerParent indicates whether owner is a parent or a member of the collection.
        internal BlockCollection(DependencyObject owner, bool isOwnerParent)
            : base(owner, isOwnerParent)
        {
        }
 
        #endregion Constructors
 
        //-------------------------------------------------------------------
        //
        //  Public Properties
        //
        //-------------------------------------------------------------------
 
        #region Public Properties
 
        /// <value>
        /// Returns a first Block of this collection
        /// </value>
        public Block FirstBlock
        {
            get
            {
                return this.FirstChild;
            }
        }
 
        /// <value>
        /// Returns a last Block of this collection
        /// </value>
        public Block LastBlock
        {
            get
            {
                return this.LastChild;
            }
        }
 
        #endregion Public Properties
    }
}