import {
  setTouchState
} from './utils/helper'

export default {
  //  图片手势初始监测
  touchStart (e) {
    const self = this
    const [touch0, touch1] = e.touches

    if (!self.src) return

    setTouchState(self, true, null, null)

    // 计算第一个触摸点的位置，并参照改点进行缩放
    self.__oneTouchStart(touch0)

    // 两指手势触发
    if (e.touches.length >= 2) {
      self.__twoTouchStart(touch0, touch1)
    }
  },

  //  图片手势动态缩放
  touchMove (e) {
    const self = this
    const [touch0, touch1] = e.touches

    if (!self.src) return

    setTouchState(self, null, true)

    // 单指手势时触发
    if (e.touches.length === 1) {
      self.__oneTouchMove(touch0)
    }
    // 两指手势触发
    if (e.touches.length >= 2) {
      self.__twoTouchMove(touch0, touch1)
    }
  },

  touchEnd (e) {
    const self = this

    if (!self.src) return

    setTouchState(self, false, false, true)
    self.__xtouchEnd()
  }
}