cmc-web/packages/common/components/image-cropper/utils/effectRipple.js

/**
 * 点击波纹效果
 *
 * @param  {[event]} e        [description]
 * @param  {[Object]} arg_opts [description]
 * @return {[bollean]}          [description]
 */
export default function (e, arg_opts) {
  const opts = Object.assign(
      {
        ele: e.target, // 波纹作用元素
        type: 'hit', // hit点击位置扩散center中心点扩展
        bgc: 'rgba(0, 0, 0, 0.15)' // 波纹颜色
      },
      arg_opts
    ),
    target = opts.ele
  if (target) {
    const rect = target.getBoundingClientRect()
    let ripple = target.querySelector('.e-ripple')
    if (!ripple) {
      ripple = document.createElement('span')
      ripple.className = 'e-ripple'
      ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px'
      target.appendChild(ripple)
    } else {
      ripple.className = 'e-ripple'
    }
    switch (opts.type) {
      case 'center':
        ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + 'px'
        ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + 'px'
        break
      default:
        ripple.style.top = e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop + 'px'
        ripple.style.left = e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft + 'px'
    }
    ripple.style.backgroundColor = opts.bgc
    ripple.className = 'e-ripple z-active'
    return false
  }
}