/source/library/Interlace/AdornedPasteUp/Rendering/ImageLinkCache.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.Drawing;

using System.Text;



using Interlace.AdornedPasteUp.Documents;



#endregion



namespace Interlace.AdornedPasteUp.Rendering

{

    public class ImageLinkCache : IDisposable

    {

        ImageLinkManager _manager;



        Dictionary<ImageLink, Image> _images;



        public ImageLinkCache(ImageLinkManager manager)

        {

            _manager = manager;



            _images = new Dictionary<ImageLink, Image>();



            _manager.LinkAttached += new EventHandler<LinkEventArgs>(_manager_LinkAttached);

            _manager.LinkDetached += new EventHandler<LinkEventArgs>(_manager_LinkDetached);



            foreach (ImageLink link in manager.Links)

            {

                _manager_LinkAttached(manager, new LinkEventArgs(manager, link));

            }

        }



        public Image GetCachedImage(ImageLink link)

        {

            return _images[link];

        }



        void _manager_LinkAttached(object sender, LinkEventArgs e)

        {

            if (_images.ContainsKey(e.Link)) throw new InvalidOperationException();



            _images[e.Link] = e.Link.CreateBitmap();

        }



        void _manager_LinkDetached(object sender, LinkEventArgs e)

        {

            if (!_images.ContainsKey(e.Link)) throw new InvalidOperationException();

            

            Image image = _images[e.Link];



            image.Dispose();



            _images.Remove(e.Link);

        }

    

        #region IDisposable Members



        public void Dispose()

        {

            if (_images != null)

            {

                foreach (Image image in _images.Values)

                {

                    image.Dispose();

                }



                _images = null;

            }

        }



        #endregion

    }

}