fix slow BluRay menu

Changelog.md

@@ -2,6 +2,10 @@
 5.4.8.4 Beta (not yet released)
 ============
 
+- BluRays with dozens of titles showed all titles in the menu
+  which was difficult to choose and also extremely slow.
+
+
 5.4.8.3 Beta
 ============
 

mpv.net/WinForms/MainForm.cs

@@ -268,15 +268,18 @@ namespace mpvnet
 
                 lock (core.BluRayTitles)
                 {
+                    List<(int Index, TimeSpan Len)> items = new List<(int Index, TimeSpan Len)>(); 
+
                     for (int i = 0; i < core.BluRayTitles.Count; i++)
-                    {
-                        if (core.BluRayTitles[i] != "00:00:00")
-                        {
-                            int tmp = i;
-                            MenuItem.Add(titles.DropDownItems, $"{core.BluRayTitles[i]} ({i})",
-                                () => core.SetBluRayTitle(tmp));
-                        }
-                    }
+                        items.Add((i, core.BluRayTitles[i]));
+
+                    var titleItems = items.OrderByDescending(item => item.Len)
+                        .Take(20).OrderBy(item => item.Index);
+
+                    foreach (var item in titleItems)
+                        if (item.Len != TimeSpan.Zero)
+                            MenuItem.Add(titles.DropDownItems, $"{item.Len} ({item.Index})",
+                                () => core.SetBluRayTitle(item.Index));
                 }
             }
         }

mpv.net/mpv/Core.cs

@@ -80,7 +80,7 @@ namespace mpvnet
     
         public List<MediaTrack> MediaTracks { get; set; } = new List<MediaTrack>();
         public List<KeyValuePair<string, double>> Chapters { get; set; } = new List<KeyValuePair<string, double>>();
-        public List<string> BluRayTitles { get; } = new List<string>();
+        public List<TimeSpan> BluRayTitles { get; } = new List<TimeSpan>();
         public IntPtr Handle { get; set; }
         public IntPtr WindowHandle { get; set; }
         
@@ -614,7 +614,10 @@ namespace mpvnet
                 if (msg.Contains(" duration: "))
                 {
                     int start = msg.IndexOf(" duration: ") + 11;
-                    BluRayTitles.Add(msg.Substring(start, 8));
+                    BluRayTitles.Add(new TimeSpan(
+                        msg.Substring(start, 2).ToInt(),
+                        msg.Substring(start + 3, 2).ToInt(),
+                        msg.Substring(start + 6, 2).ToInt()));
                 }
             }
         }