#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.Collections.ObjectModel;

using System.Text;



using Interlace.Collections;



#endregion



namespace Interlace.AdornedText

{

    public class SequenceSpan : Span, ISpanContainer

    {

        TrackedCollection<Span> _spans;



        public SequenceSpan()

        {

            _spans = new TrackedCollection<Span>();

            _spans.Added += new EventHandler<TrackedCollectionEventArgs<Span>>(_spans_Added);

            _spans.Removed += new EventHandler<TrackedCollectionEventArgs<Span>>(_spans_Removed);

        }



        void _spans_Added(object sender, TrackedCollectionEventArgs<Span> e)

        {

            e.Item.Parent = this;

        }



        void _spans_Removed(object sender, TrackedCollectionEventArgs<Span> e)

        {

            e.Item.Parent = null;

        }



        public IEnumerable<Span> ContainedSpans

        {

            get { return _spans; }

        }



        public void ReplaceSpan(Span existingSpan, Span replacementSpan)

        {

            int index = _spans.IndexOf(existingSpan);



            if (index == -1) throw new ArgumentException("The existing span is not contained in this container.", "existingSpan");



            if (replacementSpan != null)

            {

                _spans[index] = replacementSpan;

            }

            else

            {

                _spans.RemoveAt(index);

            }

        }



        public Collection<Span> Spans

        {

            get { return _spans; }

        }



        public Block Block

        {

            get

            {

                return Parent.Block;

            }

        }



        public override void Visit(NodeVisitor visitor)

        {

            visitor.VisitSequenceSpan(this);



            foreach (Span item in _spans) item.Visit(visitor);



            base.Visit(visitor);

        }

    }

}