cirnogodot/GTweensGodot/GTweens/Source/TweenBehaviours/CallbackTweenBehaviour.cs

using System;
using GTweens.Enums;

namespace GTweens.TweenBehaviours
{
    public sealed class CallbackTweenBehaviour : TweenBehaviour
    {
        readonly Action _action;
        readonly bool _callIfCompletingInstantly;
        
        public CallbackTweenBehaviour(Action action, bool callIfCompletingInstantly)
        {
            _action = action;
            _callIfCompletingInstantly = callIfCompletingInstantly;
        }

        public override void Start(bool isCompletingInstantly)
        {
            bool canCall = !isCompletingInstantly || _callIfCompletingInstantly;

            if (canCall)
            {
                _action?.Invoke();
            }

            MarkFinished();
        }

        public override void Reset(bool kill, ResetMode loopResetMode)
        {
            MarkUnfinished();
        }

        public override float GetDuration() => 0f;
        public override float GetElapsed() => 0f;
        public override bool GetLoopable() => false;
    }
}