Add FallOnDetectionComponent and CleanupOnCollisionComponent; implement falling detection and cleanup on collision

scripts/components/FallOnDetectionComponent.cs

@@ -0,0 +1,47 @@
+using Godot;
+
+namespace Mr.BrickAdventures.scripts.components;
+
+[GlobalClass]
+public partial class FallOnDetectionComponent : Node2D
+{
+    [Export] public Area2D DetectionArea { get; set; }
+    [Export] public RigidBody2D TargetBody { get; set; }
+    [Export] public float FallDelay { get; set; } = 0.2f;
+    
+    private bool _hasTriggered = false;
+
+    public override void _Ready()
+    {
+        if (DetectionArea == null)
+        {
+            GD.PrintErr("FallOnDetectionComponent: DetectionArea is not set.");
+            SetProcess(false);
+            return;
+        }
+        if (TargetBody == null)
+        {
+            GD.PrintErr("FallOnDetectionComponent: TargetBody is not set.");
+            SetProcess(false);
+            return;
+        }
+
+        DetectionArea.BodyEntered += OnBodyEntered;
+    }
+    
+    private async void OnBodyEntered(Node2D body)
+    {
+        if (_hasTriggered) return;
+        _hasTriggered = true;
+        
+        if (FallDelay > 0)
+        {
+            await ToSignal(GetTree().CreateTimer(FallDelay), Timer.SignalName.Timeout);
+        }
+
+        if (IsInstanceValid(TargetBody))
+        {
+            TargetBody.GravityScale = 1.0f;
+        }
+    }
+}