Implement control point selection

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointPiece.cs

@@ -3,6 +3,7 @@
 
 using System;
 using osu.Framework.Allocation;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Lines;
@@ -11,18 +12,21 @@ using osu.Framework.Input.Events;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Osu.Objects;
 using osuTK;
+using osuTK.Graphics;
 
 namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 {
     public class PathControlPointPiece : BlueprintPiece<Slider>
     {
         public Action<Vector2[]> ControlPointsChanged;
+        public readonly Bindable<bool> IsSelected = new Bindable<bool>();
+
+        public readonly int Index;
 
         private readonly Slider slider;
-        private readonly int index;
-
         private readonly Path path;
-        private readonly CircularContainer marker;
+        private readonly Container marker;
+        private readonly Drawable markerRing;
 
         [Resolved]
         private OsuColour colours { get; set; }
@@ -30,7 +34,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
         public PathControlPointPiece(Slider slider, int index)
         {
             this.slider = slider;
-            this.index = index;
+            Index = index;
 
             Origin = Anchor.Centre;
             AutoSizeAxes = Axes.Both;
@@ -42,13 +46,36 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
                     Anchor = Anchor.Centre,
                     PathRadius = 1
                 },
-                marker = new CircularContainer
+                marker = new Container
                 {
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
-                    Size = new Vector2(10),
+                    AutoSizeAxes = Axes.Both,
-                    Masking = true,
+                    Children = new[]
-                    Child = new Box { RelativeSizeAxes = Axes.Both }
+                    {
+                        new Circle
+                        {
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Size = new Vector2(10),
+                        },
+                        markerRing = new CircularContainer
+                        {
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Size = new Vector2(14),
+                            Masking = true,
+                            BorderThickness = 2,
+                            BorderColour = Color4.White,
+                            Alpha = 0,
+                            Child = new Box
+                            {
+                                RelativeSizeAxes = Axes.Both,
+                                Alpha = 0,
+                                AlwaysPresent = true
+                            }
+                        }
+                    }
                 }
             };
         }
@@ -57,21 +84,42 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
         {
             base.Update();
 
-            Position = slider.StackedPosition + slider.Path.ControlPoints[index];
+            Position = slider.StackedPosition + slider.Path.ControlPoints[Index];
 
-            marker.Colour = isSegmentSeparator ? colours.Red : colours.Yellow;
+            updateMarkerDisplay();
+            updateConnectingPath();
+        }
 
+        /// <summary>
+        /// Updates the state of the circular control point marker.
+        /// </summary>
+        private void updateMarkerDisplay()
+        {
+            markerRing.Alpha = IsSelected.Value ? 1 : 0;
+
+            Color4 colour = isSegmentSeparator ? colours.Red : colours.Yellow;
+            if (IsHovered || IsSelected.Value)
+                colour = Color4.White;
+            marker.Colour = colour;
+        }
+
+        /// <summary>
+        /// Updates the path connecting this control point to the previous one.
+        /// </summary>
+        private void updateConnectingPath()
+        {
             path.ClearVertices();
 
-            if (index != slider.Path.ControlPoints.Length - 1)
+            if (Index != slider.Path.ControlPoints.Length - 1)
             {
                 path.AddVertex(Vector2.Zero);
-                path.AddVertex(slider.Path.ControlPoints[index + 1] - slider.Path.ControlPoints[index]);
+                path.AddVertex(slider.Path.ControlPoints[Index + 1] - slider.Path.ControlPoints[Index]);
             }
 
             path.OriginPosition = path.PositionInBoundingBox(Vector2.Zero);
         }
 
+        // The connecting path is excluded from positional input
         public override bool ReceivePositionalInputAt(Vector2 screenSpacePos) => marker.ReceivePositionalInputAt(screenSpacePos);
 
         protected override bool OnDragStart(DragStartEvent e) => true;
@@ -80,7 +128,7 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
         {
             var newControlPoints = slider.Path.ControlPoints.ToArray();
 
-            if (index == 0)
+            if (Index == 0)
             {
                 // Special handling for the head - only the position of the slider changes
                 slider.Position += e.Delta;
@@ -90,13 +138,13 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
                     newControlPoints[i] -= e.Delta;
             }
             else
-                newControlPoints[index] += e.Delta;
+                newControlPoints[Index] += e.Delta;
 
             if (isSegmentSeparatorWithNext)
-                newControlPoints[index + 1] = newControlPoints[index];
+                newControlPoints[Index + 1] = newControlPoints[Index];
 
             if (isSegmentSeparatorWithPrevious)
-                newControlPoints[index - 1] = newControlPoints[index];
+                newControlPoints[Index - 1] = newControlPoints[Index];
 
             ControlPointsChanged?.Invoke(newControlPoints);
 
@@ -107,8 +155,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
 
         private bool isSegmentSeparator => isSegmentSeparatorWithNext || isSegmentSeparatorWithPrevious;
 
-        private bool isSegmentSeparatorWithNext => index < slider.Path.ControlPoints.Length - 1 && slider.Path.ControlPoints[index + 1] == slider.Path.ControlPoints[index];
+        private bool isSegmentSeparatorWithNext => Index < slider.Path.ControlPoints.Length - 1 && slider.Path.ControlPoints[Index + 1] == slider.Path.ControlPoints[Index];
 
-        private bool isSegmentSeparatorWithPrevious => index > 0 && slider.Path.ControlPoints[index - 1] == slider.Path.ControlPoints[index];
+        private bool isSegmentSeparatorWithPrevious => Index > 0 && slider.Path.ControlPoints[Index - 1] == slider.Path.ControlPoints[Index];
     }
 }

osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/Components/PathControlPointVisualiser.cs

@@ -4,6 +4,7 @@
 using System;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Input.Events;
 using osu.Game.Rulesets.Osu.Objects;
 using osuTK;
 
@@ -21,6 +22,8 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
         {
             this.slider = slider;
 
+            RelativeSizeAxes = Axes.Both;
+
             InternalChild = pieces = new Container<PathControlPointPiece> { RelativeSizeAxes = Axes.Both };
         }
 
@@ -33,5 +36,23 @@ namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders.Components
             while (slider.Path.ControlPoints.Length < pieces.Count)
                 pieces.Remove(pieces[pieces.Count - 1]);
         }
+
+        protected override bool OnMouseDown(MouseDownEvent e)
+        {
+            bool anySelected = false;
+
+            foreach (var piece in pieces)
+            {
+                if (piece.IsHovered)
+                {
+                    piece.IsSelected.Value = true;
+                    anySelected = true;
+                }
+                else
+                    piece.IsSelected.Value = false;
+            }
+
+            return anySelected;
+        }
     }
 }