Resolve `DroppedObjectContainer` via DI

osu.Game.Rulesets.Catch.Tests/TestSceneCatcher.cs

@@ -6,8 +6,8 @@
 using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
-using osu.Game.Rulesets.Catch.UI;
 using osu.Framework.Graphics;
+using osu.Game.Rulesets.Catch.UI;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Testing;
 using osu.Framework.Utils;
@@ -31,10 +31,23 @@ public class TestSceneCatcher : OsuTestScene
         [Resolved]
         private OsuConfigManager config { get; set; }
 
-        private DroppedObjectContainer droppedObjectContainer;
+        [Cached]
+        private readonly DroppedObjectContainer droppedObjectContainer;
+
+        private readonly Container trailContainer;
 
         private TestCatcher catcher;
 
+        public TestSceneCatcher()
+        {
+            Add(trailContainer = new Container
+            {
+                Anchor = Anchor.Centre,
+                Depth = -1
+            });
+            Add(droppedObjectContainer = new DroppedObjectContainer());
+        }
+
         [SetUp]
         public void SetUp() => Schedule(() =>
         {
@@ -43,20 +56,13 @@ public void SetUp() => Schedule(() =>
                 CircleSize = 0,
             };
 
-            var trailContainer = new Container();
-            droppedObjectContainer = new DroppedObjectContainer();
-            catcher = new TestCatcher(trailContainer, droppedObjectContainer, difficulty);
+            if (catcher != null)
+                Remove(catcher);
 
-            Child = new Container
+            Add(catcher = new TestCatcher(trailContainer, difficulty)
             {
-                Anchor = Anchor.Centre,
-                Children = new Drawable[]
-                {
-                    trailContainer,
-                    droppedObjectContainer,
-                    catcher
-                }
-            };
+                Anchor = Anchor.Centre
+            });
         });
 
         [Test]
@@ -293,8 +299,8 @@ public class TestCatcher : Catcher
         {
             public IEnumerable<CaughtObject> CaughtObjects => this.ChildrenOfType<CaughtObject>();
 
-            public TestCatcher(Container trailsTarget, DroppedObjectContainer droppedObjectTarget, BeatmapDifficulty difficulty)
-                : base(trailsTarget, droppedObjectTarget, difficulty)
+            public TestCatcher(Container trailsTarget, BeatmapDifficulty difficulty)
+                : base(trailsTarget, difficulty)
             {
             }
         }

osu.Game.Rulesets.Catch.Tests/TestSceneCatcherArea.cs

@@ -96,15 +96,12 @@ private void createCatcher(float size)
 
             SetContents(_ =>
             {
-                var droppedObjectContainer = new DroppedObjectContainer();
-
                 return new CatchInputManager(catchRuleset)
                 {
                     RelativeSizeAxes = Axes.Both,
                     Children = new Drawable[]
                     {
-                        droppedObjectContainer,
-                        new TestCatcherArea(droppedObjectContainer, beatmapDifficulty)
+                        new TestCatcherArea(beatmapDifficulty)
                         {
                             Anchor = Anchor.Centre,
                             Origin = Anchor.TopCentre,
@@ -122,9 +119,13 @@ private void load(RulesetStore rulesets)
 
         private class TestCatcherArea : CatcherArea
         {
-            public TestCatcherArea(DroppedObjectContainer droppedObjectContainer, BeatmapDifficulty beatmapDifficulty)
-                : base(droppedObjectContainer, beatmapDifficulty)
+            [Cached]
+            private readonly DroppedObjectContainer droppedObjectContainer;
+
+            public TestCatcherArea(BeatmapDifficulty beatmapDifficulty)
+                : base(beatmapDifficulty)
             {
+                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
             }
 
             public void ToggleHyperDash(bool status) => MovableCatcher.SetHyperDashState(status ? 2 : 1);

osu.Game.Rulesets.Catch.Tests/TestSceneHyperDashColouring.cs

@@ -118,11 +118,10 @@ private void checkHyperDashCatcherColour(ISkin skin, Color4 expectedCatcherColou
 
             AddStep("create hyper-dashing catcher", () =>
             {
-                Child = setupSkinHierarchy(catcherArea = new CatcherArea(new DroppedObjectContainer())
+                Child = setupSkinHierarchy(catcherArea = new TestCatcherArea
                 {
                     Anchor = Anchor.Centre,
-                    Origin = Anchor.Centre,
-                    Scale = new Vector2(4f),
+                    Origin = Anchor.Centre
                 }, skin);
             });
 
@@ -206,5 +205,18 @@ public TestSkin()
             {
             }
         }
+
+        private class TestCatcherArea : CatcherArea
+        {
+            [Cached]
+            private readonly DroppedObjectContainer droppedObjectContainer;
+
+            public TestCatcherArea()
+            {
+                Scale = new Vector2(4f);
+
+                AddInternal(droppedObjectContainer = new DroppedObjectContainer());
+            }
+        }
     }
 }

osu.Game.Rulesets.Catch/UI/CatchPlayfield.cs

@@ -26,6 +26,9 @@ public class CatchPlayfield : ScrollingPlayfield
         /// </summary>
         public const float CENTER_X = WIDTH / 2;
 
+        [Cached]
+        private readonly DroppedObjectContainer droppedObjectContainer;
+
         internal readonly CatcherArea CatcherArea;
 
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
@@ -34,9 +37,7 @@ public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) =>
 
         public CatchPlayfield(BeatmapDifficulty difficulty)
         {
-            var droppedObjectContainer = new DroppedObjectContainer();
-
-            CatcherArea = new CatcherArea(droppedObjectContainer, difficulty)
+            CatcherArea = new CatcherArea(difficulty)
             {
                 Anchor = Anchor.BottomLeft,
                 Origin = Anchor.TopLeft,
@@ -44,7 +45,7 @@ public CatchPlayfield(BeatmapDifficulty difficulty)
 
             InternalChildren = new[]
             {
-                droppedObjectContainer,
+                droppedObjectContainer = new DroppedObjectContainer(),
                 CatcherArea.MovableCatcher.CreateProxiedContent(),
                 HitObjectContainer.CreateProxy(),
                 // This ordering (`CatcherArea` before `HitObjectContainer`) is important to

osu.Game.Rulesets.Catch/UI/Catcher.cs

@@ -79,7 +79,8 @@ public class Catcher : SkinReloadableDrawable
         /// <summary>
         /// Contains objects dropped from the plate.
         /// </summary>
-        private readonly DroppedObjectContainer droppedObjectTarget;
+        [Resolved]
+        private DroppedObjectContainer droppedObjectTarget { get; set; }
 
         public CatcherAnimationState CurrentState
         {
@@ -134,10 +135,9 @@ public Direction VisualDirection
         private readonly DrawablePool<CaughtBanana> caughtBananaPool;
         private readonly DrawablePool<CaughtDroplet> caughtDropletPool;
 
-        public Catcher([NotNull] Container trailsTarget, [NotNull] DroppedObjectContainer droppedObjectTarget, BeatmapDifficulty difficulty = null)
+        public Catcher([NotNull] Container trailsTarget, BeatmapDifficulty difficulty = null)
         {
             this.trailsTarget = trailsTarget;
-            this.droppedObjectTarget = droppedObjectTarget;
 
             Origin = Anchor.TopCentre;
 

osu.Game.Rulesets.Catch/UI/CatcherArea.cs

@@ -30,7 +30,7 @@ public class CatcherArea : Container, IKeyBindingHandler<CatchAction>
         /// </summary>
         private int currentDirection;
 
-        public CatcherArea(DroppedObjectContainer droppedObjectContainer, BeatmapDifficulty difficulty = null)
+        public CatcherArea(BeatmapDifficulty difficulty = null)
         {
             Size = new Vector2(CatchPlayfield.WIDTH, CATCHER_SIZE);
             Children = new Drawable[]
@@ -44,7 +44,7 @@ public CatcherArea(DroppedObjectContainer droppedObjectContainer, BeatmapDifficu
                     Margin = new MarginPadding { Bottom = 350f },
                     X = CatchPlayfield.CENTER_X
                 },
-                MovableCatcher = new Catcher(this, droppedObjectContainer, difficulty) { X = CatchPlayfield.CENTER_X },
+                MovableCatcher = new Catcher(this, difficulty) { X = CatchPlayfield.CENTER_X },
             };
         }