/// <summary>
/// Adds a virtual item to the cache.
/// </summary>
/// <param name="guid">The guid representing this item.</param>
/// <param name="adaptor">The adaptor for this item.</param>
/// <param name="key">The key of this item.</param>
/// <param name="thumbSize">Requested thumbnail size.</param>
/// <param name="thumb">Thumbnail image to add to cache.</param>
/// <param name="useEmbeddedThumbnails">UseEmbeddedThumbnails property of the owner control.</param>
/// <param name="autoRotate">AutoRotate property of the owner control.</param>
/// <param name="useWIC">Whether to use WIC.</param>
public void Add(Guid guid, ImageListViewItemAdaptor adaptor, object key, Size thumbSize, Image thumb, UseEmbeddedThumbnails useEmbeddedThumbnails, bool autoRotate, bool useWIC)
{
// Already cached?
if (thumbCache.TryGetValue(guid, out CacheItem item))
{
if (item.Size == thumbSize && item.UseEmbeddedThumbnails == useEmbeddedThumbnails)
{
return;
}
}
// Resize
thumb = ThumbnailExtractor.FromImage(thumb, thumbSize, useEmbeddedThumbnails, autoRotate, useWIC);
// Add to cache
thumbCache.Add(guid, new CacheItem(guid, thumbSize, thumb, CacheState.Cached, useEmbeddedThumbnails, autoRotate, useWIC));
// Add to disk cache
using (MemoryStream stream = new MemoryStream())
{
string diskCacheKey = adaptor.GetUniqueIdentifier(key, thumbSize, useEmbeddedThumbnails, autoRotate, useWIC);
thumb.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
DiskCache.Write(diskCacheKey, stream);
}
// Raise the cache events
if (mImageListView != null)
{
mImageListView.OnThumbnailCachedInternal(guid, thumb, thumbSize, true);
mImageListView.Refresh();
}
}
/// <summary>
/// Gets the image from the thumbnail cache. If the image is not cached,
/// null will be returned.
/// </summary>
/// <param name="guid">The guid representing this item.</param>
/// <param name="adaptor">The adaptor of this item.</param>
/// <param name="key">The key of this item.</param>
/// <param name="thumbSize">Requested thumbnail size.</param>
/// <param name="useEmbeddedThumbnails">UseEmbeddedThumbnails property of the owner control.</param>
/// <param name="autoRotate">AutoRotate property of the owner control.</param>
/// <param name="useWIC">Whether to use WIC.</param>
/// <param name="clone">true to return a clone of the cached image; otherwise false.</param>
public Image GetImage(Guid guid, ImageListViewItemAdaptor adaptor, object key, Size thumbSize, UseEmbeddedThumbnails useEmbeddedThumbnails, bool autoRotate, bool useWIC, bool clone)
{
if (thumbCache.TryGetValue(guid, out CacheItem item) &&
item != null &&
item.Image != null &&
item.Size == thumbSize &&
item.UseEmbeddedThumbnails == useEmbeddedThumbnails &&
item.AutoRotate == autoRotate &&
item.UseWIC == useWIC)
{
return(clone ? (Image)item.Image.Clone() : item.Image);
}
else
{
string diskCacheKey = adaptor.GetUniqueIdentifier(key, thumbSize, useEmbeddedThumbnails, autoRotate, useWIC);
// Check the disk cache
using (Stream stream = DiskCache.Read(diskCacheKey))
{
if (stream.Length > 0)
{
return(new Bitmap(stream));
}
}
}
return(null);
}
