摄像机区域的架构改动

Assets/_Game/Scripts/World/InteractableDetector.cs

@@ -0,0 +1,86 @@
+using BaseGames.Core.Events;
+using BaseGames.Input;
+using UnityEngine;
+
+namespace BaseGames.World
+{
+    /// <summary>
+    /// 挂在 Player 上，检测附近可交互物，驱动 UI 提示显示/隐藏。
+    /// 通过 InputReaderSO.InteractEvent 绑定交互输入。
+    /// </summary>
+    public class InteractableDetector : MonoBehaviour
+    {
+        [SerializeField] private float                _detectRadius = 1.5f;
+        [SerializeField] private LayerMask            _interactableLayer;
+        [SerializeField] private InputReaderSO        _inputReader;
+        [SerializeField] private StringEventChannelSO _onShowInteractPrompt;
+        [SerializeField] private VoidEventChannelSO   _onHideInteractPrompt;
+
+        private IInteractable _nearest;
+        private IInteractable _previousNearest;
+
+        // 预分配检测缓冲区，避免 OverlapCircleAll 每帧 GC 分配
+        private readonly Collider2D[] _overlapBuffer = new Collider2D[16];
+
+        private void OnEnable()  => _inputReader.InteractEvent += TryInteract;
+        private void OnDisable() => _inputReader.InteractEvent -= TryInteract;
+
+        private void Update()
+        {
+            int count = Physics2D.OverlapCircleNonAlloc(
+                transform.position, _detectRadius, _overlapBuffer, _interactableLayer);
+            _nearest = FindNearest(_overlapBuffer, count);
+
+            if (_nearest != _previousNearest)
+            {
+                if (_previousNearest != null)
+                {
+                    _previousNearest.OnPlayerExitRange();
+                    _onHideInteractPrompt?.Raise();
+                }
+
+                if (_nearest != null)
+                {
+                    _nearest.OnPlayerEnterRange(transform);
+                    _onShowInteractPrompt?.Raise(_nearest.InteractPrompt);
+                }
+
+                _previousNearest = _nearest;
+            }
+        }
+
+        private void TryInteract()
+        {
+            if (_nearest != null && _nearest.CanInteract)
+                _nearest.Interact(transform);
+        }
+
+        private IInteractable FindNearest(Collider2D[] hits, int count)
+        {
+            IInteractable best     = null;
+            float         bestDist = float.MaxValue;
+
+            for (int i = 0; i < count; i++)
+            {
+                var col = hits[i];
+                var interactable = col.GetComponentInParent<IInteractable>();
+                if (interactable == null || !interactable.CanInteract) continue;
+
+                float dist = Vector2.Distance(transform.position, col.transform.position);
+                if (dist < bestDist)
+                {
+                    bestDist = dist;
+                    best     = interactable;
+                }
+            }
+
+            return best;
+        }
+
+        private void OnDrawGizmosSelected()
+        {
+            Gizmos.color = Color.cyan;
+            Gizmos.DrawWireSphere(transform.position, _detectRadius);
+        }
+    }
+}