Preload top used images.

Wox/ImageLoader/ImageCacheStroage.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Wox.Infrastructure.Storage;
+
+namespace Wox.ImageLoader
+{
+    [Serializable]
+    public class ImageCacheStroage : BinaryStorage<ImageCacheStroage>
+    {
+        public int counter = 0;
+        public const int maxCached = 200;
+        public Dictionary<string, int> TopUsedImages = new Dictionary<string, int>();
+
+        protected override string ConfigName
+        {
+            get { return "ImageCache"; }
+        }
+
+        public void Add(string path)
+        {
+            if (TopUsedImages.ContainsKey(path))
+            {
+                TopUsedImages[path] = TopUsedImages[path] + 1 ;
+            }
+            else
+            {
+                TopUsedImages.Add(path, 1);
+            }
+
+            if (TopUsedImages.Count > maxCached)
+            {
+                TopUsedImages = TopUsedImages.OrderByDescending(o => o.Value)
+                    .Take(maxCached)
+                    .ToDictionary(i => i.Key, i => i.Value);
+            }
+
+            if (++counter == 30)
+            {
+                counter = 0;
+                Save();
+            }
+        }
+
+        public void Remove(string path)
+        {
+            if (TopUsedImages.ContainsKey(path))
+            {
+                TopUsedImages.Remove(path);
+            }
+        }
+    }
+}