downloading placeholder

Pixiview/Illust/FavoritesPage.xaml.cs

@@ -49,7 +49,7 @@ namespace Pixiview.Illust
 
         public void Reload(bool force = false)
         {
-            loaded = false;
+            lastUpdated = default;
             StartLoad(force);
         }
 

Pixiview/Illust/IllustCollectionPage.cs

@@ -50,12 +50,12 @@ namespace Pixiview.Illust
 
         #endregion
 
-        protected static bool NeedUpdate { get; private set; } = true;
+        protected static DateTime LastUpdated { get; private set; } = DateTime.Now;
 
         public IllustCollection IllustCollection { get; set; }
 
         protected virtual bool IsFavoriteVisible => true;
-        protected bool loaded;
+        protected DateTime lastUpdated;
 
         private T illustData;
         private readonly ParallelOptions parallelOptions = new ParallelOptions { MaxDegreeOfParallelism = Configs.MaxThreads };
@@ -77,7 +77,7 @@ namespace Pixiview.Illust
         public override void OnUnload()
         {
             Illusts = IllustCollection.Empty;
-            loaded = false;
+            lastUpdated = default;
         }
 
         protected override void OnAppearing()
@@ -85,10 +85,8 @@ namespace Pixiview.Illust
             base.OnAppearing();
             Connectivity.ConnectivityChanged += Connectivity_ConnectivityChanged;
 
-            if (NeedUpdate || !loaded)
+            if (lastUpdated != LastUpdated)
             {
-                NeedUpdate = false;
-                loaded = false;
                 StartLoad();
             }
             else if (IsFavoriteVisible)
@@ -111,7 +109,7 @@ namespace Pixiview.Illust
         {
             if (e.NetworkAccess == NetworkAccess.Internet)
             {
-                if (!loaded)
+                if (lastUpdated != LastUpdated)
                 {
                     StartLoad(true);
                 }
@@ -149,9 +147,9 @@ namespace Pixiview.Illust
 
         protected void StartLoad(bool force = false)
         {
-            if (force || !loaded)
+            if (force || lastUpdated != LastUpdated)
             {
-                loaded = true;
+                lastUpdated = LastUpdated;
                 IsLoading = true;
                 Task.Run(() => DoLoadIllusts(force));
             }
@@ -166,7 +164,7 @@ namespace Pixiview.Illust
                 // image
                 var image = new RoundImage
                 {
-                    BackgroundColor = Color.LightGray,
+                    BackgroundColor = StyleDefinition.ColorDownloadBackground,
                     CornerRadius = 10,
                     CornerMasks = CornerMask.Top,
                     HorizontalOptions = LayoutOptions.Fill,
@@ -351,7 +349,7 @@ namespace Pixiview.Illust
             }
             if (force && IsFavoriteVisible)
             {
-                NeedUpdate = true;
+                LastUpdated = DateTime.Now;
             }
 
             var data = DoGetIllustList(illustData, commandIllustImageTapped).Where(i => i != null);
@@ -362,6 +360,10 @@ namespace Pixiview.Illust
                 var favorites = Stores.Favorites;
                 foreach (var item in collection)
                 {
+                    if (item.Image == null)
+                    {
+                        item.Image = StyleDefinition.DownloadBackground;
+                    }
                     item.IsFavorite = favorites.Any(i => i.Id == item.Id);
                 }
             }

Pixiview/UI/StyleDefinition.cs

@@ -17,6 +17,8 @@ namespace Pixiview.UI
         public static readonly Color ColorLightShadow = Color.FromRgba(0, 0, 0, 0x20);
         public static readonly Color ColorDeepShadow = Color.FromRgba(0, 0, 0, 0x50);
         public static readonly Color ColorRedBackground = Color.FromRgb(0xfd, 0x43, 0x63);
+        public static readonly Color ColorDownloadBackground = Color.FromRgb(0xd7, 0xd9, 0xe0);
+        public static readonly ImageSource DownloadBackground = ImageSource.FromFile("download.png");
         public static readonly double FontSizeMicro = Device.GetNamedSize(NamedSize.Micro, typeof(Label));
         public static readonly double FontSizeSmall = Device.GetNamedSize(NamedSize.Small, typeof(Label));