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src/LightEditor/LightEditorHandle.cs

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+using Cthangover.Core.UI.Lights;
+using Godot;
+
+namespace Cthangover.Core.UI.Tool.LightEditor
+{
+    /// <summary>
+    /// Draggable 24×24 coloured handle representing a light source on the preview.
+    /// Overrides <c>_GuiInput</c> (Godot virtual) for mouse drag support; the colour
+    /// is taken from <see cref="LightDef.ToColor"/>. Raises <see cref="DragUpdate"/>
+    /// with the handle's centre position in global coordinates for the window to
+    /// convert back to normalised coordinates.
+    /// </summary>
+    public partial class LightEditorHandle : ColorRect
+    {
+        /// <summary>Index of the light in <see cref="LightEditorController.Lights"/>.</summary>
+        public int LightIndex;
+        /// <summary>Invoked during drag with the centre position in global coordinates.</summary>
+        public System.Action<Vector2> DragUpdate;
+        /// <summary>Invoked when the handle is clicked (mouse down).</summary>
+        public System.Action Clicked;
+
+		private bool dragging;
+		private Vector2 dragOffset;
+
+        /// <summary>Creates a 24×24 handle coloured to match the light's <see cref="LightDef.ToColor"/> value.</summary>
+        public LightEditorHandle(LightDef light, int index)
+		{
+			LightIndex = index;
+			Size = new Vector2(24, 24);
+			Color = light.ToColor();
+			MouseFilter = MouseFilterEnum.Stop;
+		}
+
+        /// <summary>Handles mouse drag and click via Godot's virtual input system (<c>_GuiInput</c>).</summary>
+        public override void _GuiInput(InputEvent @event)
+		{
+			if (@event is InputEventMouseButton mb && mb.ButtonIndex == MouseButton.Left)
+			{
+				if (mb.Pressed)
+				{
+					dragging = true;
+					dragOffset = GetGlobalMousePosition() - GlobalPosition;
+					Clicked?.Invoke();
+				}
+				else
+				{
+					dragging = false;
+				}
+				AcceptEvent();
+			}
+			else if (@event is InputEventMouseMotion && dragging)
+			{
+				GlobalPosition = GetGlobalMousePosition() - dragOffset;
+				DragUpdate?.Invoke(GlobalPosition + Size / 2);
+			}
+		}
+	}
+}