//--------------------------------------------------------
//    [Author]:           第二世界
//    [  Date ]:           Sunday, September 10, 2017
//--------------------------------------------------------
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;

namespace vnxbqy.UI
{

    public class UI3DModelInteractProcessor : MonoBehaviour
    {
        public event Action clickEvent;
        public event Action<Vector2> beginDragEvent;
        public event Action<Vector2> endDragEvent;
        public event Action<Vector2> dragingEvent;

        RectTransform m_RectTransform;
        public RectTransform rectTransform {
            get { return m_RectTransform; }
            set {
                m_RectTransform = value;
            }
        }

        bool isDown = false;
        float downTime = 0f;

        private void LateUpdate()
        {
            if (Input.GetMouseButtonDown(0))
            {
                OnPointerDown();
            }

            if (Input.GetMouseButton(0))
            {
                OnPointerDrag();
            }

            if (Input.GetMouseButtonUp(0))
            {
                OnPointerUp();
            }
        }

        void OnPointerDown()
        {
            if (RectTransformUtility.RectangleContainsScreenPoint(rectTransform, Input.mousePosition, CameraManager.uiCamera))
            {
                isDown = true;
                downTime = Time.time;
                if (beginDragEvent != null)
                {
                    beginDragEvent(Input.mousePosition);
                }
            }

        }

        void OnPointerDrag()
        {
            if (!isDown)
            {
                return;
            }

            if (dragingEvent != null)
            {
                dragingEvent(Input.mousePosition);
            }
        }

        void OnPointerUp()
        {
            if (isDown)
            {
                if (Time.time - downTime < 0.3f)
                {
                    if (RectTransformUtility.RectangleContainsScreenPoint(rectTransform, Input.mousePosition, CameraManager.uiCamera))
                    {
                        OnPointerClick();
                    }
                }

                if (endDragEvent != null)
                {
                    endDragEvent(Input.mousePosition);
                }
            }

            isDown = false;
        }

        void OnPointerClick()
        {
            if (clickEvent != null)
            {
                clickEvent();
            }
        }
    }

}