Added GTWeen

GTweensGodot/GTweens/Source/TweenBehaviours/TweenBehaviour.cs

@@ -0,0 +1,34 @@
+using System;
+using GTweens.Easings;
+using GTweens.Enums;
+
+namespace GTweens.TweenBehaviours;
+
+public abstract class TweenBehaviour : ITweenBehaviour
+{
+    bool _finished;
+    
+    public bool GetFinished() => _finished;
+
+    protected void MarkFinished() => _finished = true;
+    protected void MarkUnfinished() => _finished = false;
+    
+    public float GetRemaining()
+    {
+        float duration = GetDuration();
+        float elapsed = GetElapsed();
+
+        return Math.Max(duration - elapsed, 0f);
+    }
+    
+    public abstract float GetDuration();
+    public abstract float GetElapsed();
+    public virtual bool GetLoopable() => true;
+    
+    public virtual void Start(bool isCompletingInstantly) { }
+    public virtual void Tick(float deltaTime) { }
+    public virtual void Kill() { }
+    public virtual void Complete() { }
+    public virtual void Reset(bool kill, ResetMode loopResetMode) { }
+    public virtual void SetEasing(EasingDelegate easingFunction) { }
+}