Download

KoKoViewer/DownloadHelper.cs

@@ -75,6 +75,22 @@ static ToastNotification ToastProgress(KoKo.Post post)
             return toast;
         }
 
+        public static StorageFile GetDownloaded(KoKo.Post post)
+        {
+            StorageFolder applicationFolder = KnownFolders.PicturesLibrary;
+            StorageFolder folder = applicationFolder.CreateFolderAsync("KoKo Images", CreationCollisionOption.OpenIfExists).AsTask().Result;
+            var image = post.images.First().First();
+
+            try
+            {
+                return folder.GetFileAsync(KoKo.Utils.normalizeFileName(image.fileName)).AsTask().Result;
+            }
+            catch(Exception)
+            {
+                return null;
+            }
+        }
+
         public static async void Download(KoKo.Post post)
         {
             StorageFolder applicationFolder = KnownFolders.PicturesLibrary;

KoKoViewer/Viewer.xaml

@@ -30,7 +30,6 @@
                 <Image.Source>
                     <BitmapImage 
                         x:Name="ImageSource"
-                        UriSource="{x:Bind imageUrl}" 
                         AutoPlay="True"
                         ImageOpened="BitmapImage_ImageOpened"
                         ImageFailed="ImageSource_ImageFailed"

KoKoViewer/Viewer.xaml.cs

@@ -6,6 +6,7 @@
 using System.Runtime.InteropServices.WindowsRuntime;
 using Windows.Foundation;
 using Windows.Foundation.Collections;
+using Windows.Storage;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Controls.Primitives;
@@ -24,7 +25,6 @@ namespace KoKoViewer
     /// </summary>
     public sealed partial class Viewer : Page
     {
-        string imageUrl;
         KoKo.Post post;
         SearchOption searchOption;
 
@@ -40,9 +40,17 @@ protected override void OnNavigatedTo(NavigationEventArgs e)
             post = p.Item1;
             searchOption = p.Item2;
 
-            imageUrl = post.images.First().Last().imageUrl;
-
-            Flyout_ViewLarger.IsEnabled = post.images.First().Count() > 1;
+            var cache = DownloadHelper.GetDownloaded(post);
+            if (cache != null)
+            {
+                Flyout_ViewLarger.IsEnabled = false;
+                ImageSource.SetSource(cache.OpenAsync(FileAccessMode.Read).AsTask().Result);
+            }
+            else
+            {
+                ImageSource.UriSource = new Uri(post.images.First().Last().imageUrl);
+                Flyout_ViewLarger.IsEnabled = post.images.First().Count() > 1;
+            }
         }
 
         private void Page_SizeChanged(object sender, SizeChangedEventArgs e)
@@ -80,7 +88,7 @@ private async void FlyoutSourceList_ItemClick(object sender, ItemClickEventArgs
         private void Flyout_ViewLarger_Click(object sender, RoutedEventArgs e)
         {
             (sender as AppBarButton).IsEnabled = false;
-            imageUrl = post.images.First().First().imageUrl;
+            var imageUrl = post.images.First().First().imageUrl;
             ImageSource.UriSource = new Uri(imageUrl);
 
             Flyout.Hide();
@@ -110,6 +118,13 @@ private void Flyout_Opening(object sender, object e)
                 DisplayScore.Text = $" Score:{post.score.Value}";
             }
 
+            if(DownloadHelper.GetDownloaded(post) != null)
+            {
+                Flyout_Download.IsEnabled = false;
+                Flyout_ViewLarger.IsEnabled = false;
+                Flyout_Download.Label = "Downloaded";
+            }
+
             if (FavoritesData.Get().Has(post.fromSpider.Name, post.id))
             {
                 Flyout_Star.Icon = new SymbolIcon() { Symbol = Symbol.UnFavorite };

README.md

@@ -37,7 +37,7 @@ KoKoViewer是KoKo的使用UWP的GUI实现，提供了基本的浏览功能。
 
 ### 后续工作
 - [x] 收藏夹
-- [ ] 下载图片
+- [x] 下载图片
 - [ ] 支持播放视频
 
 ### 如何安装