using UnityEngine;
using UnityEngine.UI;
namespace AX.ImageViewer
{
    public class ImageViewer : MonoBehaviour
    {
        #region Static Variables
        private static ImageViewer m_instance = null;
        public static ImageViewer Instance
        {
            get
            {
                if (m_instance == null)
                {
                    m_instance = Instantiate(Resources.Load<GameObject>("ImageViewerCanvas")).GetComponent<ImageViewer>();
                    DontDestroyOnLoad(m_instance.gameObject);
                    m_instance.gameObject.SetActive(false);
                }

                return m_instance;
            }
        }
        #endregion

        #region Variables
        [SerializeField]
        private Image ImagePanel;
        [SerializeField]
        private GameObject ScaleSlider;
        public int minWidth = 380;
        public int minHeight = 300;

        #endregion

        #region Button Events
        //Rotate
        public void OnRotate()
        {
            ImagePanel.rectTransform.localEulerAngles = new Vector3(ImagePanel.rectTransform.localEulerAngles.x, ImagePanel.rectTransform.localEulerAngles.y, ImagePanel.rectTransform.localEulerAngles.z + -90f);
        }
        public void OnSacelButton()
        {
            if (ScaleSlider.activeSelf)
                ScaleSlider.SetActive(false);
            else
                ScaleSlider.SetActive(true);
        }
        //Scale
        public void OnScale(Slider slider)
        {
            ImagePanel.rectTransform.localScale = new Vector3(slider.value, slider.value, slider.value);
        }
        //Resize
        public void OnResize()
        {
            ImagePanel.rectTransform.localEulerAngles = new Vector3(0, 0, 0);
            ScaleSlider.GetComponent<Slider>().value = 1;
            //ImagePanel.rectTransform.localScale = new Vector3(1, 1, 1);
            ImagePanel.GetComponent<RectTransform>().anchoredPosition = new Vector2(0, 0);
        }
        //Close
        public void OnCloseButtonClicked()
        {
            Hide();
        }
        #endregion
        #region Helper Functions
        public void Show()
        {
            gameObject.SetActive(true);
        }
        public void Hide()
        {
            gameObject.SetActive(false);
        }
        #endregion

        /// <summary>
        /// 查看图片
        /// </summary>
        /// <param name="ImagePath"></param>
        public static void Load(Texture2D texture)
        {
            Instance.Show();
            Instance.ImagePanel.sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), Vector2.zero);
            Instance.ImagePanel.preserveAspect = false;
        }
    }

}