rename from Pixiview to Gallery

Gallery/Illust/RelatedIllustsPage.xaml.cs

@@ -0,0 +1,120 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Gallery.UI;
+using Gallery.Utils;
+using Xamarin.Forms;
+
+namespace Gallery.Illust
+{
+    public partial class RelatedIllustsPage : IllustRecommendsCollectionPage
+    {
+        private const int STEP = 18;
+
+        private readonly IllustItem illustItem;
+        private int startIndex;
+        private int nextIndex;
+        private string[] illustIds;
+
+        public RelatedIllustsPage(IllustItem item)
+        {
+            illustItem = item;
+
+            Resources.Add("cardView", GetCardViewTemplate());
+            InitializeComponent();
+
+            startIndex = -1;
+            nextIndex = 0;
+        }
+
+        protected override void OnAppearing()
+        {
+            if (startIndex != -1 && Illusts == null)
+            {
+                startIndex = -1;
+            }
+            base.OnAppearing();
+        }
+
+        protected override bool IsAutoReload => false;
+        protected override ActivityIndicator LoadingIndicator => activityLoading;
+
+        protected override IEnumerable<IllustItem> DoGetIllustList(IllustRecommendsData data, out int tag)
+        {
+            tag = startIndex;
+            if (data.body == null)
+            {
+                return null;
+            }
+            return data.body.illusts.Where(i => i.url != null).Select(i => i.ConvertToItem());
+        }
+
+        protected override IllustRecommendsData DoLoadIllustData(bool force)
+        {
+            IllustRecommendsData data;
+            if (startIndex < 0)
+            {
+                // init
+                data = Stores.LoadIllustRecommendsInitData(illustItem.Id);
+                if (data == null || data.body == null)
+                {
+                    return null;
+                }
+                illustIds = data.body.nextIds;
+            }
+            else
+            {
+                if (illustIds == null || startIndex >= illustIds.Length)
+                {
+                    return null;
+                }
+                var ids = illustIds.Skip(startIndex).Take(STEP).ToArray();
+                data = Stores.LoadIllustRecommendsListData(illustItem.Id, ids);
+                nextIndex = startIndex + STEP;
+                if (ids.Length == 0 || nextIndex >= illustIds.Length)
+                {
+                    // done
+#if DEBUG
+                    App.DebugPrint($"download completed: {startIndex}");
+#endif
+                    startIndex = nextIndex;
+                }
+            }
+            return data;
+        }
+
+        private void FlowLayout_MaxHeightChanged(object sender, HeightEventArgs e)
+        {
+            SetOffset(e.ContentHeight - scrollView.Bounds.Height - SCROLL_OFFSET);
+        }
+
+        protected override bool CheckRefresh()
+        {
+            if (nextIndex > startIndex)
+            {
+                startIndex = nextIndex;
+                return true;
+            }
+            return false;
+        }
+
+        private void ScrollView_Scrolled(object sender, ScrolledEventArgs e)
+        {
+            var y = e.ScrollY;
+            OnScrolled(y);
+        }
+
+        private async void Refresh_Clicked(object sender, EventArgs e)
+        {
+            if (IsLoading)
+            {
+                return;
+            }
+            await ScrollToTopAsync(scrollView);
+            startIndex = -1;
+            nextIndex = 0;
+            illustIds = null;
+            StartLoad(true);
+        }
+    }
+}