Initial commit

Assets/Scripts/UI/NonDrawingGraphic.cs

@@ -0,0 +1,21 @@
+using UnityEngine.TestTools;
+using UnityEngine.UI;
+
+namespace BracerLib.UI
+{
+    /// A concrete subclass of the Unity UI `Graphic` class that just skips drawing.
+    /// Useful for providing a raycast target without actually drawing anything.
+    [ExcludeFromCoverage]
+    public class NonDrawingGraphic : Graphic
+    {
+        public override void SetMaterialDirty() { }
+
+        public override void SetVerticesDirty() { }
+
+        /// Probably not necessary since the chain of calls `Rebuild()`->`UpdateGeometry()`->`DoMeshGeneration()`->`OnPopulateMesh()` won't happen; so here really just as a fail-safe.
+        protected override void OnPopulateMesh(VertexHelper vh)
+        {
+            vh.Clear();
+        }
+    }
+}