Add MoveCommand

osu.Game.Rulesets.Osu/Objects/OsuHitObject.cs

@@ -14,7 +14,7 @@ using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Objects
 {
-    public abstract class OsuHitObject : HitObject, IHasComboInformation, IHasPosition, IHasTimePreempt
+    public abstract class OsuHitObject : HitObject, IHasComboInformation, IHasMutablePosition, IHasTimePreempt
     {
         /// <summary>
         /// The radius of hit objects (ie. the radius of a <see cref="HitCircle"/>).

osu.Game/Rulesets/Objects/Types/IHasMutablePosition.cs

@@ -0,0 +1,18 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osuTK;
+
+namespace osu.Game.Rulesets.Objects.Types
+{
+    /// <summary>
+    /// A HitObject that has a starting position that can be mutated.
+    /// </summary>
+    public interface IHasMutablePosition : IHasPosition
+    {
+        /// <summary>
+        /// The starting position of the HitObject.
+        /// </summary>
+        new Vector2 Position { get; set; }
+    }
+}

osu.Game/Screens/Edit/Commands/MoveCommand.cs

@@ -0,0 +1,27 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Objects.Types;
+using osuTK;
+
+namespace osu.Game.Screens.Edit.Commands
+{
+    public class MoveCommand : IEditorCommand
+    {
+        public readonly IHasMutablePosition Target;
+
+        public readonly Vector2 Position;
+
+        public MoveCommand(IHasMutablePosition target, Vector2 position)
+        {
+            Target = target;
+            Position = position;
+        }
+
+        public void Apply() => Target.Position = Position;
+
+        public IEditorCommand CreateUndo() => new MoveCommand(Target, Target.Position);
+
+        public bool IsRedundant => Position == Target.Position;
+    }
+}