Add very basic replay handling

osu.Game.Rulesets.Catch/Replays/CatchAutoGenerator.cs

@@ -0,0 +1,54 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Catch.Objects;
+using osu.Game.Rulesets.Replays;
+using osu.Game.Users;
+
+namespace osu.Game.Rulesets.Catch.Replays
+{
+    internal class CatchAutoGenerator : AutoGenerator<CatchHitObject>
+    {
+        public const double RELEASE_DELAY = 20;
+
+        public CatchAutoGenerator(Beatmap<CatchHitObject> beatmap)
+            : base(beatmap)
+        {
+            Replay = new Replay { User = new User { Username = @"Autoplay" } };
+        }
+
+        protected Replay Replay;
+
+        public override Replay Generate()
+        {
+            // Todo: Realistically this shouldn't be needed, but the first frame is skipped with the way replays are currently handled
+            Replay.Frames.Add(new CatchReplayFrame(-100000, 0));
+
+            foreach (var obj in Beatmap.HitObjects)
+            {
+                switch (obj)
+                {
+                    case Fruit _:
+                        Replay.Frames.Add(new CatchReplayFrame(obj.StartTime, obj.X));
+                        break;
+                }
+
+                foreach (var nestedObj in obj.NestedHitObjects.Cast<CatchHitObject>())
+                {
+                    switch (nestedObj)
+                    {
+                        case BananaShower.Banana _:
+                        case TinyDroplet _:
+                        case Droplet _:
+                            Replay.Frames.Add(new CatchReplayFrame(nestedObj.StartTime, nestedObj.X));
+                            break;
+                    }
+                }
+            }
+
+            return Replay;
+        }
+    }
+}

osu.Game.Rulesets.Catch/Replays/CatchFramedReplayInputHandler.cs

@@ -0,0 +1,32 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+using osu.Framework.Input;
+using osu.Game.Rulesets.Replays;
+
+namespace osu.Game.Rulesets.Catch.Replays
+{
+    public class CatchFramedReplayInputHandler : FramedReplayInputHandler
+    {
+        public CatchFramedReplayInputHandler(Replay replay)
+            : base(replay)
+        {
+        }
+
+        public override List<InputState> GetPendingStates() => new List<InputState>
+        {
+            new CatchReplayState
+            {
+                PressedActions = new List<CatchAction> { CatchAction.PositionUpdate },
+                CatcherX = ((CatchReplayFrame)CurrentFrame).MouseX
+            },
+            new CatchReplayState { PressedActions = new List<CatchAction>() },
+        };
+
+        public class CatchReplayState : ReplayState<CatchAction>
+        {
+            public float? CatcherX { get; set; }
+        }
+    }
+}

osu.Game.Rulesets.Catch/Replays/CatchReplayFrame.cs

@@ -0,0 +1,17 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Rulesets.Replays;
+
+namespace osu.Game.Rulesets.Catch.Replays
+{
+    public class CatchReplayFrame : ReplayFrame
+    {
+        public override bool IsImportant => MouseX > 0;
+
+        public CatchReplayFrame(double time, float? x = null)
+            : base(time, x ?? -1, null, ReplayButtonState.None)
+        {
+        }
+    }
+}