using Rewired.Utils;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace Rewired.UI.ControlMapper
{
	[RequireComponent(typeof(Selectable))]
	[AddComponentMenu("")]
	public class ScrollRectSelectableChild : MonoBehaviour, ISelectHandler, IEventSystemHandler
	{
		public bool useCustomEdgePadding;

		public float customEdgePadding = 50f;

		private ScrollRect parentScrollRect;

		private Selectable _selectable;

		private RectTransform parentScrollRectContentTransform
		{
			get
			{
				return parentScrollRect.content;
			}
		}

		private Selectable selectable
		{
			get
			{
				return _selectable ?? (_selectable = GetComponent<Selectable>());
			}
		}

		private RectTransform rectTransform
		{
			get
			{
				return base.transform as RectTransform;
			}
		}

		private void Start()
		{
			parentScrollRect = base.transform.GetComponentInParent<ScrollRect>();
			if (parentScrollRect == null)
			{
				Debug.LogError("Rewired Control Mapper: No ScrollRect found! This component must be a child of a ScrollRect!");
			}
		}

		public void OnSelect(BaseEventData eventData)
		{
			if (parentScrollRect == null)
			{
				return;
			}
			AxisEventData axisEventData = eventData as AxisEventData;
			if (axisEventData != null)
			{
				RectTransform rectTransform = parentScrollRect.transform as RectTransform;
				Rect child = MathTools.TransformRect(this.rectTransform.rect, this.rectTransform, rectTransform);
				Rect rect = rectTransform.rect;
				Rect rect2 = rectTransform.rect;
				float num = ((!useCustomEdgePadding) ? child.height : customEdgePadding);
				rect2.yMax -= num;
				rect2.yMin += num;
				Vector2 offset;
				if (!MathTools.RectContains(rect2, child) && MathTools.GetOffsetToContainRect(rect2, child, out offset))
				{
					Vector2 anchoredPosition = parentScrollRectContentTransform.anchoredPosition;
					anchoredPosition.x = Mathf.Clamp(anchoredPosition.x + offset.x, 0f, Mathf.Abs(rect.width - parentScrollRectContentTransform.sizeDelta.x));
					anchoredPosition.y = Mathf.Clamp(anchoredPosition.y + offset.y, 0f, Mathf.Abs(rect.height - parentScrollRectContentTransform.sizeDelta.y));
					parentScrollRectContentTransform.anchoredPosition = anchoredPosition;
				}
			}
		}
	}
}