using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace SRF.UI
{
	[ExecuteInEditMode]
	[RequireComponent(typeof(RectTransform))]
	[AddComponentMenu("SRF/UI/Content Fit Text")]
	public class ContentFitText : UIBehaviour, ILayoutElement
	{
		public SRText CopySource;

		public Vector2 Padding;

		public float minWidth
		{
			get
			{
				if (CopySource == null)
				{
					return -1f;
				}
				return LayoutUtility.GetMinWidth(CopySource.rectTransform) + Padding.x;
			}
		}

		public float preferredWidth
		{
			get
			{
				if (CopySource == null)
				{
					return -1f;
				}
				return LayoutUtility.GetPreferredWidth(CopySource.rectTransform) + Padding.x;
			}
		}

		public float flexibleWidth
		{
			get
			{
				if (CopySource == null)
				{
					return -1f;
				}
				return LayoutUtility.GetFlexibleWidth(CopySource.rectTransform);
			}
		}

		public float minHeight
		{
			get
			{
				if (CopySource == null)
				{
					return -1f;
				}
				return LayoutUtility.GetFlexibleHeight(CopySource.rectTransform) + Padding.y;
			}
		}

		public float preferredHeight
		{
			get
			{
				if (CopySource == null)
				{
					return -1f;
				}
				return LayoutUtility.GetPreferredHeight(CopySource.rectTransform) + Padding.y;
			}
		}

		public float flexibleHeight
		{
			get
			{
				if (CopySource == null)
				{
					return -1f;
				}
				return LayoutUtility.GetFlexibleHeight(CopySource.rectTransform);
			}
		}

		public int layoutPriority
		{
			get
			{
				return 0;
			}
		}

		public void CalculateLayoutInputHorizontal()
		{
			CopySource.CalculateLayoutInputHorizontal();
		}

		public void CalculateLayoutInputVertical()
		{
			CopySource.CalculateLayoutInputVertical();
		}

		protected override void OnEnable()
		{
			SetDirty();
			CopySource.LayoutDirty += CopySourceOnLayoutDirty;
		}

		private void CopySourceOnLayoutDirty(SRText srText)
		{
			SetDirty();
		}

		protected override void OnTransformParentChanged()
		{
			SetDirty();
		}

		protected override void OnDisable()
		{
			CopySource.LayoutDirty -= CopySourceOnLayoutDirty;
			SetDirty();
		}

		protected override void OnDidApplyAnimationProperties()
		{
			SetDirty();
		}

		protected override void OnBeforeTransformParentChanged()
		{
			SetDirty();
		}

		protected void SetDirty()
		{
			if (IsActive())
			{
				LayoutRebuilder.MarkLayoutForRebuild(base.transform as RectTransform);
			}
		}
	}
}