From f6647de7693de11ad68b8316eb17483bd9bb3126 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Thu, 25 Mar 2021 19:56:26 +0900
Subject: [PATCH] Add support for nudging objects in the editor using
 ctrl+arrow keys

Closes #12042.
---
 .../Components/ComposeBlueprintContainer.cs   | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/osu.Game/Screens/Edit/Compose/Components/ComposeBlueprintContainer.cs b/osu.Game/Screens/Edit/Compose/Components/ComposeBlueprintContainer.cs
index 79f457c050..5ab557804e 100644
--- a/osu.Game/Screens/Edit/Compose/Components/ComposeBlueprintContainer.cs
+++ b/osu.Game/Screens/Edit/Compose/Components/ComposeBlueprintContainer.cs
@@ -10,6 +10,7 @@
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Input;
+using osu.Framework.Input.Events;
 using osu.Game.Audio;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Edit;
@@ -19,6 +20,7 @@
 using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Screens.Edit.Components.TernaryButtons;
 using osuTK;
+using osuTK.Input;
 
 namespace osu.Game.Screens.Edit.Compose.Components
 {
@@ -70,6 +72,50 @@ protected override void LoadComplete()
             }
         }
 
+        protected override bool OnKeyDown(KeyDownEvent e)
+        {
+            if (e.ControlPressed)
+            {
+                switch (e.Key)
+                {
+                    case Key.Left:
+                        moveSelection(new Vector2(-1, 0));
+                        return true;
+
+                    case Key.Right:
+                        moveSelection(new Vector2(1, 0));
+                        return true;
+
+                    case Key.Up:
+                        moveSelection(new Vector2(0, -1));
+                        return true;
+
+                    case Key.Down:
+                        moveSelection(new Vector2(0, 1));
+                        return true;
+                }
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Move the current selection spatially by the specified delta, in gamefield coordinates (ie. the same coordinates as the blueprints).
+        /// </summary>
+        /// <param name="delta"></param>
+        private void moveSelection(Vector2 delta)
+        {
+            var firstBlueprint = SelectionHandler.SelectedBlueprints.FirstOrDefault();
+
+            if (firstBlueprint == null)
+                return;
+
+            // convert to game space coordinates
+            delta = firstBlueprint.ToScreenSpace(delta) - firstBlueprint.ToScreenSpace(Vector2.Zero);
+
+            SelectionHandler.HandleMovement(new MoveSelectionEvent(firstBlueprint, firstBlueprint.ScreenSpaceSelectionPoint + delta));
+        }
+
         private void updatePlacementNewCombo()
         {
             if (currentPlacement?.HitObject is IHasComboInformation c)