using UnityEngine;

namespace Com.Xyz.UI

{

    [ExecuteInEditMode]

    [RequireComponent(typeof(UIRoot))]

    public class UIScreenAdaptive : MonoBehaviour

    {

        public int aspectRatioWidth = ;

        public int aspectRatioHeight = ;

        public bool runOnlyOnce = false;

        private UIRoot mRoot;

        private bool mStarted = false;

        private void Awake()

        {

            UICamera.onScreenResize += OnScreenResize;

        }

        private void OnDestroy()

        {

            UICamera.onScreenResize -= OnScreenResize;

        }

        private void Start()

        {

            mRoot = NGUITools.FindInParents<UIRoot>(this.gameObject);

            mRoot.scalingStyle = UIRoot.Scaling.FixedSize;

            this.Update();

            mStarted = true;

        }

        private void OnScreenResize()

        {

            if (mStarted && runOnlyOnce)

            {

                this.Update();

            }

        }

        private void Update()

        {

            float defaultAspectRatio = aspectRatioWidth * 1f / aspectRatioHeight;

            float currentAspectRatio = Screen.width * 1f / Screen.height;

            if (defaultAspectRatio > currentAspectRatio)

            {

                int horizontalManualHeight = Mathf.FloorToInt(aspectRatioWidth / currentAspectRatio);

                mRoot.manualHeight = horizontalManualHeight;

            }

            else

            {

                mRoot.manualHeight = aspectRatioHeight;

            }

            if (runOnlyOnce && Application.isPlaying)

            {

                this.enabled = false;

            }

        }

    }

}