/// <summary>
/// Purges invisible items from the cache.
/// </summary>
/// <param name="force">true to purge the cache now, regardless of
/// memory usage; otherwise false to automatically purge the cache
/// depending on memory usage.</param>
public void PurgeInvisible(bool force)
{
if (mImageListView == null)
{
return;
}
Dictionary <Guid, bool> visible = mImageListView.GetVisibleItems();
if (visible.Count == 0)
{
return;
}
foreach (KeyValuePair <Guid, CacheItem> item in thumbCache)
{
if (!visible.ContainsKey(item.Key))
{
removedItems.Add(item.Key);
MemoryUsedByRemoved += GetImageMemorySize(item.Value.Image);
}
}
Purge(force);
}