GodotComponentTest/entities/Chest.cs

using Godot;
using System;

public class Chest : Entity
{
    // Declare member variables here. Examples:
    // private int a = 2;
    // private string b = "text";

    public enum LidState
    {
        Closed,
        Open
    }

    public LidState State = LidState.Closed;
    public bool IsMouseOver = false;
    private MeshInstance _mesh;
    private SpatialMaterial _previousMaterial;
    private AnimationPlayer _animationPlayer;
    
    [Signal]
    delegate void EntityClicked(Entity entity);
    
    // Called when the node enters the scene tree for the first time.
    public override void _Ready()
    {
        _mesh = GetNode<MeshInstance>("Armature/Skeleton/Chest");
        _animationPlayer = GetNode<AnimationPlayer>("AnimationPlayer");
        
        Connect("input_event", this, nameof(OnAreaInputEvent));
        Connect("mouse_entered", this, nameof(OnAreaMouseEntered));
        Connect("mouse_exited", this, nameof(OnAreaMouseExited));
    }

    
    public void OnAreaInputEvent(Node camera, InputEvent inputEvent, Vector3 position, Vector3 normal,
        int shapeIndex)
    {
        if (IsMouseOver && inputEvent is InputEventMouseButton)
        {
            InputEventMouseButton mouseButtonEvent = (InputEventMouseButton)inputEvent;
            if (mouseButtonEvent.ButtonIndex == 1 && mouseButtonEvent.Pressed)
            {
                EmitSignal("EntityClicked", this);
            }
        }
    }

    
    public void OnAreaMouseEntered()
    {
        IsMouseOver = true;
        SpatialMaterial overrideMaterial = new SpatialMaterial();
        overrideMaterial.AlbedoColor = new Color(1, 0, 0);
        _mesh.MaterialOverride = overrideMaterial;
    }

    
    public void OnAreaMouseExited()
    {
        IsMouseOver = false;
        _mesh.MaterialOverride = null;
    }


    public void OnInteract()
    {
        _animationPlayer.Stop();
        
        if (State == LidState.Closed)
        {
            State = LidState.Open;
            _animationPlayer.Play("ChestOpen");
        }
        else
        {
            _animationPlayer.PlayBackwards("ChestOpen");
            State = LidState.Closed;
        }
    }
}