Implement hold note placement

osu.Game.Rulesets.Mania/Edit/Blueprints/HoldNotePlacementBlueprint.cs

@@ -0,0 +1,87 @@
+// 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.Framework.Graphics;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Mania.Edit.Blueprints.Components;
+using osu.Game.Rulesets.Mania.Objects;
+using osu.Game.Rulesets.Mania.UI;
+
+namespace osu.Game.Rulesets.Mania.Edit.Blueprints
+{
+    public class HoldNotePlacementBlueprint : ManiaPlacementBlueprint<HoldNote>
+    {
+        private readonly EditNotePiece headPiece;
+        private readonly EditNotePiece tailPiece;
+
+        private PlacementState state;
+
+        public HoldNotePlacementBlueprint()
+            : base(new HoldNote())
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            InternalChildren = new[]
+            {
+                headPiece = new EditNotePiece { Origin = Anchor.Centre },
+                tailPiece = new EditNotePiece { Origin = Anchor.Centre }
+            };
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            switch (state)
+            {
+                case PlacementState.Start:
+                    headPiece.Position = SnappedMousePosition;
+                    headPiece.Width = SnappedWidth;
+                    break;
+                case PlacementState.End:
+                    tailPiece.Position = SnappedMousePosition;
+                    tailPiece.Width = headPiece.Width;
+                    break;
+            }
+        }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            Column column;
+            if ((column = ColumnAt(e.ScreenSpaceMousePosition)) == null)
+                return base.OnMouseDown(e);
+
+            HitObject.StartTime = TimeAt(e.ScreenSpaceMousePosition);
+            HitObject.Column = column.Index;
+
+            BeginPlacement();
+
+            state = PlacementState.End;
+
+            return true;
+        }
+
+        protected override bool OnMouseUp(MouseUpEvent e)
+        {
+            var endTime = TimeAt(e.ScreenSpaceMousePosition);
+            if (endTime < HitObject.StartTime)
+            {
+                var tmp = endTime;
+                endTime = HitObject.StartTime;
+                HitObject.StartTime = tmp;
+            }
+
+            HitObject.Duration = endTime - HitObject.StartTime;
+
+            EndPlacement();
+
+            return true;
+        }
+
+        private enum PlacementState
+        {
+            Start,
+            End
+        }
+    }
+}

osu.Game.Rulesets.Mania/Edit/HoldNoteCompositionTool.cs

@@ -0,0 +1,19 @@
+// 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.Edit;
+using osu.Game.Rulesets.Edit.Tools;
+using osu.Game.Rulesets.Mania.Edit.Blueprints;
+
+namespace osu.Game.Rulesets.Mania.Edit
+{
+    public class HoldNoteCompositionTool : HitObjectCompositionTool
+    {
+        public HoldNoteCompositionTool()
+            : base("Hold")
+        {
+        }
+
+        public override PlacementBlueprint CreatePlacementBlueprint() => new HoldNotePlacementBlueprint();
+    }
+}

osu.Game.Rulesets.Mania/Edit/ManiaHitObjectComposer.cs

@@ -43,7 +43,8 @@ namespace osu.Game.Rulesets.Mania.Edit
 
         protected override IReadOnlyList<HitObjectCompositionTool> CompositionTools => new HitObjectCompositionTool[]
         {
-            new NoteCompositionTool()
+            new NoteCompositionTool(),
+            new HoldNoteCompositionTool()
         };
 
         public override SelectionBlueprint CreateBlueprintFor(DrawableHitObject hitObject)