# 点击波纹

# 一、效果图

# 二、使用方式

html 元素使用 v-wave 指令

<button v-waves>水波纹效果</button>

# 三、代码

import "./waves.css";

const context = "@@wavesContext";

function handleClick(el, binding) {
  function handle(e) {
    const customOpts = Object.assign({}, binding.value);
    const opts = Object.assign(
      {
        ele: el, // 波纹作用元素
        type: "hit", // hit 点击位置扩散 center中心点扩展
        color: "rgba(0, 0, 0, 0.15)", // 波纹颜色
      },
      customOpts
    );
    const target = opts.ele;
    if (target) {
      target.style.position = "relative";
      target.style.overflow = "hidden";
      const rect = target.getBoundingClientRect();
      let ripple = target.querySelector(".waves-ripple");
      if (!ripple) {
        ripple = document.createElement("span");
        ripple.className = "waves-ripple";
        ripple.style.height = ripple.style.width =
          Math.max(rect.width, rect.height) + "px";
        target.appendChild(ripple);
      } else {
        ripple.className = "waves-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.documentElement.scrollTop || document.body.scrollTop) +
            "px";
          ripple.style.left =
            (e.pageX -
              rect.left -
              ripple.offsetWidth / 2 -
              document.documentElement.scrollLeft || document.body.scrollLeft) +
            "px";
      }
      ripple.style.backgroundColor = opts.color;
      ripple.className = "waves-ripple z-active";
      return false;
    }
  }

  if (!el[context]) {
    el[context] = {
      removeHandle: handle,
    };
  } else {
    el[context].removeHandle = handle;
  }

  return handle;
}

export default {
  bind(el, binding) {
    el.addEventListener("click", handleClick(el, binding), false);
  },
  update(el, binding) {
    el.removeEventListener("click", el[context].removeHandle, false);
    el.addEventListener("click", handleClick(el, binding), false);
  },
  unbind(el) {
    el.removeEventListener("click", el[context].removeHandle, false);
    el[context] = null;
    delete el[context];
  },
};

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.waves-ripple {
  position: absolute;
  border-radius: 100%;
  background-color: rgba(0, 0, 0, 0.15);
  background-clip: padding-box;
  pointer-events: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transform: scale(0);
  -ms-transform: scale(0);
  transform: scale(0);
  opacity: 1;
}

.waves-ripple.z-active {
  opacity: 0;
  -webkit-transform: scale(2);
  -ms-transform: scale(2);
  transform: scale(2);
  -webkit-transition: opacity 1.2s ease-out, -webkit-transform 0.6s ease-out;
  transition: opacity 1.2s ease-out, -webkit-transform 0.6s ease-out;
  transition: opacity 1.2s ease-out, transform 0.6s ease-out;
  transition: opacity 1.2s ease-out, transform 0.6s ease-out,
    -webkit-transform 0.6s ease-out;
}

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