Added GTWeen

GTweensGodot/GTweens/Source/TweenBehaviours/InterpolationTweenBehaviour.cs

@@ -0,0 +1,173 @@
+using System;
+using System.Collections.Generic;
+using GTweens.Easings;
+using GTweens.Enums;
+using GTweens.Tweeners;
+
+namespace GTweens.TweenBehaviours
+{
+    public sealed class InterpolationTweenBehaviour : TweenBehaviour
+    {
+        readonly List<ITweener> _tweeners = new();
+        readonly List<ITweener> _playingTweeners = new();
+        
+        bool _durationCalculated;
+        float _cachedCalculatedDuration;
+
+        public override void Start(bool isCompletingInstantly)
+        {
+            StartTweeners();
+        }
+
+        public override void Tick(float deltaTime)
+        {
+            for (int i = _playingTweeners.Count - 1; i >= 0; --i)
+            {
+                ITweener tweener = _playingTweeners[i];
+                    
+                tweener.Tick(deltaTime);
+
+                if (!tweener.IsPlaying)
+                {
+                    _playingTweeners.RemoveAt(i);
+                }
+            }
+
+            if (_playingTweeners.Count == 0)
+            {
+                MarkFinished();
+            }
+        }
+
+        public override void Kill()
+        {
+            foreach (ITweener tweener in _playingTweeners)
+            {
+                tweener.Kill();
+            }
+
+            _playingTweeners.Clear();
+            
+            MarkFinished();
+        }
+
+        public override void Complete()
+        {
+            foreach (ITweener tweener in _playingTweeners)
+            {
+                if (!tweener.IsPlaying)
+                {
+                    continue;
+                }
+                
+                tweener.Complete();
+            }
+
+            _playingTweeners.Clear();
+
+            MarkFinished();
+        }
+
+        public override void Reset(bool kill, ResetMode resetMode)
+        {
+            for (int i = _tweeners.Count - 1; i >= 0; --i)
+            {
+                ITweener tweener = _tweeners[i];
+
+                tweener.Reset(resetMode);
+            }
+            
+            MarkUnfinished();
+        }
+        
+        public override void SetEasing(EasingDelegate easingFunction)
+        {
+            foreach (ITweener tweener in _tweeners)
+            {
+                tweener.SetEasing(easingFunction);
+            }
+        }
+        
+        public override float GetDuration()
+        {
+            if(_durationCalculated)
+            {
+                return _cachedCalculatedDuration;
+            }
+
+            _durationCalculated = true;
+
+            _cachedCalculatedDuration = 0.0f;
+
+            foreach (ITweener tweener in _tweeners)
+            {
+                _cachedCalculatedDuration += tweener.Duration;
+            }
+
+            return _cachedCalculatedDuration;
+        }
+
+        public override float GetElapsed()
+        {
+            float totalElapsed = 0.0f;
+
+            foreach (ITweener tweener in _tweeners)
+            {
+                totalElapsed += tweener.Elapsed;
+            }
+
+            return totalElapsed;
+        }
+
+        public void Add(ITweener tweener)
+        {
+            if (tweener == null)
+            {
+                throw new ArgumentNullException(
+                    $"Tried to {nameof(Add)} a null {nameof(ITweener)} on {nameof(InterpolationTweenBehaviour)}"
+                );
+            }
+
+            if (tweener.IsPlaying)
+            {
+                throw new ArgumentNullException(
+                    $"Tried to {nameof(Add)} a {nameof(ITweener)} on {nameof(InterpolationTweenBehaviour)} but it was already playing"
+                );
+            }
+
+            if (_tweeners.Contains(tweener))
+            {
+                throw new ArgumentNullException(
+                    $"Tried to {nameof(Add)} a {nameof(ITweener)} on {nameof(InterpolationTweenBehaviour)} but it was already added"
+                );
+            }
+
+            _tweeners.Add(tweener);
+
+            _durationCalculated = false;
+        }
+
+        void StartTweeners()
+        {
+            _playingTweeners.Clear();
+            _playingTweeners.AddRange(_tweeners);
+
+            for (int i = _playingTweeners.Count - 1; i >= 0; --i)
+            {
+                ITweener tweener = _playingTweeners[i];
+                
+                tweener.Start();
+
+                if (!tweener.IsPlaying)
+                {
+                    _playingTweeners.RemoveAt(i);
+                }
+            }
+
+            if (_playingTweeners.Count == 0)
+            {
+                MarkFinished();
+            }
+        }
+    }
+}