feat (interaction): Add PressurePlateButton and WallInteractButton classes with interaction logic

Assets/Code/Scripts/Interaction/PressurePlateButton.cs

@@ -0,0 +1,76 @@
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Events;
+
+[RequireComponent(typeof(Collider))]
+public class PressurePlateButton : MonoBehaviour
+{
+    [Header("Detection")]
+    [Tooltip("Layers that can activate the plate. Keep default to allow everything.")]
+    [SerializeField] private LayerMask detectionMask = ~0;
+
+    [Tooltip("If true, rigidbody objects can activate the plate.")]
+    [SerializeField] private bool allowRigidbodies = true;
+
+    [Tooltip("If true, the Player can activate the plate (tag Player or PlayerMovement component).")]
+    [SerializeField] private bool allowPlayer = true;
+
+    [Header("Events")]
+    public UnityEvent OnPressed;
+    public UnityEvent OnReleased;
+
+    private readonly HashSet<Collider> m_validCollidersOnPlate = new HashSet<Collider>();
+    private bool m_isPressed;
+
+    private void Reset()
+    {
+        Collider col = GetComponent<Collider>();
+        col.isTrigger = true;
+    }
+
+    private void OnTriggerEnter(Collider other)
+    {
+        if (!IsValidActivator(other))
+            return;
+
+        m_validCollidersOnPlate.Add(other);
+
+        if (!m_isPressed)
+        {
+            m_isPressed = true;
+            OnPressed?.Invoke();
+        }
+    }
+
+    private void OnTriggerExit(Collider other)
+    {
+        if (!m_validCollidersOnPlate.Remove(other))
+            return;
+
+        if (m_validCollidersOnPlate.Count == 0 && m_isPressed)
+        {
+            m_isPressed = false;
+            OnReleased?.Invoke();
+        }
+    }
+
+    private bool IsValidActivator(Collider other)
+    {
+        if (((1 << other.gameObject.layer) & detectionMask) == 0)
+            return false;
+
+        if (allowPlayer)
+        {
+            if (other.CompareTag("Player"))
+                return true;
+
+            if (other.GetComponentInParent<PlayerMovement>() != null)
+                return true;
+        }
+
+        if (allowRigidbodies && other.attachedRigidbody != null)
+            return true;
+
+        return false;
+    }
+}