UnityEditor.CurveMenuManager.SetTangent C# (CSharp) Method

        public void SetTangent(int leftRight, AnimationUtility.TangentMode mode, List<KeyIdentifier> keysToSet)
        {
            List<ChangedCurve> list = new List<ChangedCurve>();
            foreach (KeyIdentifier identifier in keysToSet)
            {
                AnimationCurve curve = identifier.curve;
                Keyframe key = identifier.keyframe;
                AnimationUtility.SetKeyBroken(ref key, true);
                if (leftRight == 2)
                {
                    AnimationUtility.SetKeyLeftTangentMode(ref key, mode);
                    AnimationUtility.SetKeyRightTangentMode(ref key, mode);
                }
                else if (leftRight == 0)
                {
                    AnimationUtility.SetKeyLeftTangentMode(ref key, mode);
                    if ((AnimationUtility.GetKeyRightTangentMode(key) == AnimationUtility.TangentMode.ClampedAuto) || (AnimationUtility.GetKeyRightTangentMode(key) == AnimationUtility.TangentMode.Auto))
                    {
                        AnimationUtility.SetKeyRightTangentMode(ref key, AnimationUtility.TangentMode.Free);
                    }
                }
                else
                {
                    AnimationUtility.SetKeyRightTangentMode(ref key, mode);
                    if ((AnimationUtility.GetKeyLeftTangentMode(key) == AnimationUtility.TangentMode.ClampedAuto) || (AnimationUtility.GetKeyLeftTangentMode(key) == AnimationUtility.TangentMode.Auto))
                    {
                        AnimationUtility.SetKeyLeftTangentMode(ref key, AnimationUtility.TangentMode.Free);
                    }
                }
                if ((mode == AnimationUtility.TangentMode.Constant) && ((leftRight == 0) || (leftRight == 2)))
                {
                    key.inTangent = float.PositiveInfinity;
                }
                if ((mode == AnimationUtility.TangentMode.Constant) && ((leftRight == 1) || (leftRight == 2)))
                {
                    key.outTangent = float.PositiveInfinity;
                }
                curve.MoveKey(identifier.key, key);
                AnimationUtility.UpdateTangentsFromModeSurrounding(curve, identifier.key);
                ChangedCurve item = new ChangedCurve(curve, identifier.curveId, identifier.binding);
                if (!list.Contains(item))
                {
                    list.Add(item);
                }
            }
            this.updater.UpdateCurves(list, "Set Tangents");
        }
    }