riversong-code-showcase/Source/Riversong/Game/EditTools/DeleteTool/DeleteTool.cs

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();
            }
        }
    }
}