riversong code showcase

Source/Riversong/Game/EditTools/DeleteTool/DeleteTool.cs

@@ -0,0 +1,57 @@
+using Cysharp.Threading.Tasks;
+using Unity.Mathematics;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class DeleteTool : DragTool
+    {
+        private ISignalBus _signalBus;
+
+        public DeleteTool(IServiceLocator serviceLocator) : base(serviceLocator)
+        {
+        }
+
+        protected override DeletedGameObjectsFilter DeletedGameObjectsFilter => DeletedGameObjectsFilter.All;
+
+        public override async UniTask InitializeAsync()
+        {
+            await base.InitializeAsync();
+
+            _signalBus = ServiceLocator.GetService<ISignalBus>();
+        }
+
+        protected override bool Validate(ref int2 startTile, ref int2 endTile)
+        {
+            return true;
+        }
+
+        protected override void UpdateAffectedTiles(bool isValid, int2 startTile, int2 endTile)
+        {
+            foreach (var tile in TileRange.From(startTile, endTile)) AffectedTiles.Add((tile, TileHighlightType.DeletePreview));
+        }
+
+        protected override void DoTool(int2 startTile, int2 endTile)
+        {
+            _ = DoToolAsync(new TileRect(startTile, endTile));
+        }
+
+        private async UniTask DoToolAsync(TileRect rect)
+        {
+            const int count = 10;
+
+            var countX = (int)math.ceil((float)rect.Width / count);
+            var countY = (int)math.ceil((float)rect.Height / count);
+
+            for (var x = 0; x < countX; x++)
+            for (var y = 0; y < countY; y++)
+            {
+                var r = new TileRect(rect.Min + new int2(x, y) * count, count, count);
+                r.Max = math.min(r.Max, rect.Max);
+
+                _signalBus.Raise(new DoDeleteToolSignal(r));
+
+                await UniTask.NextFrame();
+            }
+        }
+    }
+}