Add project files.

Assets/Cryville/Common/Unity/UI/LayoutAspectRatioFitter.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Cryville.Common.Unity.UI {
+	public class LayoutAspectRatioFitter : MonoBehaviour {
+		[SerializeField]
+		private float m_aspectRatioPerElement = 1;
+		public float AspectRatioPerElement {
+			get { return m_aspectRatioPerElement; }
+			set { m_aspectRatioPerElement = value; }
+		}
+
+		AspectRatioFitter aspectRatioFitter;
+		DockAspectRatioLayoutGroup syncTo;
+		int axis;
+#pragma warning disable IDE0051
+		void Awake() {
+			aspectRatioFitter = GetComponent<AspectRatioFitter>();
+			if (aspectRatioFitter == null) {
+				syncTo = GetComponentInParent<DockAspectRatioLayoutGroup>();
+				axis = (syncTo.DockSide == DockLayoutGroup.Side.Top || syncTo.DockSide == DockLayoutGroup.Side.Bottom) ? 1 : 0;
+			}
+			else axis = aspectRatioFitter.aspectMode == AspectRatioFitter.AspectMode.WidthControlsHeight ? 1 : 0;
+			OnTransformChildrenChanged();
+		}
+		void OnTransformChildrenChanged() {
+			float r;
+			switch (axis) {
+				case 0:
+					r = AspectRatioPerElement * transform.childCount;
+					break;
+				case 1:
+					r = AspectRatioPerElement / transform.childCount;
+					break;
+				default: return;
+			}
+			if (aspectRatioFitter != null) aspectRatioFitter.aspectRatio = r;
+			else syncTo.DockAspectRatio = r;
+		}
+#pragma warning restore IDE0051
+	}
+}