/source/library/Interlace/AdornedText/Blocks/BlockSequence.cs

#region Using Directives and Copyright Notice



// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above copyright

//       notice, this list of conditions and the following disclaimer in the

//       documentation and/or other materials provided with the distribution.

//     * Neither the name of the Computer Consultancy Pty Ltd nor the

//       names of its contributors may be used to endorse or promote products

//       derived from this software without specific prior written permission.

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 

// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 

// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 

// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 

// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 

// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 

// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 

// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

// DAMAGE.



using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Text;



using Interlace.Collections;



#endregion



namespace Interlace.AdornedText

{

    public class BlockSequence : Block

    {

        TrackedBindingList<Block> _blocks;



        public BlockSequence()

        {

            _blocks = new TrackedBindingList<Block>();

            _blocks.Added += new EventHandler<TrackedBindingListEventArgs<Block>>(_blocks_Added);

            _blocks.Removed += new EventHandler<TrackedBindingListEventArgs<Block>>(_blocks_Removed);

        }



        void _blocks_Added(object sender, TrackedBindingListEventArgs<Block> e)

        {

            e.Item.Parent = this;

        }



        void _blocks_Removed(object sender, TrackedBindingListEventArgs<Block> e)

        {

            e.Item.Parent = null;

        }



        public IList<Block> Blocks

        {

            get { return _blocks; }

        }



        public void ReplaceBlock(Block existingBlock, Block replacementBlockOrNull)

        {

            int index = _blocks.IndexOf(existingBlock);



            if (index == -1) throw new ArgumentException("The existing block does not exist in the block sequence.", "existingBlock");



            if (replacementBlockOrNull == null)

            {

                _blocks.RemoveAt(index);

            }

            else

            {

                _blocks[index] = replacementBlockOrNull;

            }

        }



        public override void Visit(NodeVisitor visitor)

        {

            visitor.VisitBlockSequence(this);



            foreach (Block block in _blocks) block.Visit(visitor);



            base.Visit(visitor);

        }

    }

}