Proposed changes for issue #162: Request for custom video cover art

Right-click on video now has a 'change cover' option that opens a file picker to select the image file. Tested on W10 and Xbox

Signed-off-by: Martin Finkel martin@videolabs.io

Work by Evan Blackstone.

• Test on mobile
• Add translations
• Can we trigger an image refresh without rescanning the whole library?
• What if the user selects a huge picture? Is the buffer cleared properly in the helper functions?

app/VLC.Core/Commands/VideoLibrary/ChangeVideoCoverCommand.cs

+/**********************************************************************
+ * VLC for WinRT
+ **********************************************************************
+ * Copyright © 2013-2014 VideoLAN and Authors
+ *
+ * Licensed under GPLv2+ and MPLv2
+ * Refer to COPYING file of the official project for license
+ **********************************************************************/
+
+using Windows.Storage.Pickers;
+using Windows.UI.Xaml.Controls;
+using VLC.Model.Video;
+using System;
+using VLC.ViewModels;
+using VLC.Utils;
+
+namespace VLC.Commands.VideoLibrary
+{
+    public class ChangeVideoCoverCommand : AlwaysExecutableCommand
+    {
+        public override async void Execute(object parameter)
+        {
+            var video = parameter as VideoItem;
+
+            if (video == null)
+            {
+                if(parameter is ItemClickEventArgs args)
+                    video = args.ClickedItem as VideoItem;
+            }
+
+            if (video == null)
+                return;
+
+            var openPicker = new FileOpenPicker
+            {
+                ViewMode = PickerViewMode.Thumbnail,
+                SuggestedStartLocation = PickerLocationId.VideosLibrary,
+                FileTypeFilter = { ".jpg", ".jpeg", ".png", ".gif" },
+                CommitButtonText = "Select image cover" // TODO: needs translation
+            };
+
+            // Windows Phone launches the picker, then freezes the app. We need
+            // to pick it up again on OnActivated.
+            var file = await openPicker.PickSingleFileAsync();
+            if (file == null) return;
+            var byteArray = await ConvertImage.ConvertImagetoByte(file);
+            await video.DeleteVideoThumbFile();
+            await Locator.VideoMetaService.SaveMoviePictureAsync(video, byteArray);
+            Locator.MediaLibrary.UpdateVideo(video);
+            video.InitializeVideoImage();
+        }
+    }
+}