element-plus/es/el-transition/index.js

A Component Library for Vue3.0

import { defineComponent, openBlock, createBlock, Transition, toHandlers, withCtx, renderSlot } from 'vue';
import { addClass, removeClass } from '../utils/dom';

var script = defineComponent({
  name: "ElCollapseTransition",
  setup() {
    return {
      on: {
        beforeEnter(el) {
          addClass(el, "collapse-transition");
          if (!el.dataset)
            el.dataset = {};
          el.dataset.oldPaddingTop = el.style.paddingTop;
          el.dataset.oldPaddingBottom = el.style.paddingBottom;
          el.style.height = "0";
          el.style.paddingTop = 0;
          el.style.paddingBottom = 0;
        },
        enter(el) {
          el.dataset.oldOverflow = el.style.overflow;
          if (el.scrollHeight !== 0) {
            el.style.height = el.scrollHeight + "px";
            el.style.paddingTop = el.dataset.oldPaddingTop;
            el.style.paddingBottom = el.dataset.oldPaddingBottom;
          } else {
            el.style.height = "";
            el.style.paddingTop = el.dataset.oldPaddingTop;
            el.style.paddingBottom = el.dataset.oldPaddingBottom;
          }
          el.style.overflow = "hidden";
        },
        afterEnter(el) {
          removeClass(el, "collapse-transition");
          el.style.height = "";
          el.style.overflow = el.dataset.oldOverflow;
        },
        beforeLeave(el) {
          if (!el.dataset)
            el.dataset = {};
          el.dataset.oldPaddingTop = el.style.paddingTop;
          el.dataset.oldPaddingBottom = el.style.paddingBottom;
          el.dataset.oldOverflow = el.style.overflow;
          el.style.height = el.scrollHeight + "px";
          el.style.overflow = "hidden";
        },
        leave(el) {
          if (el.scrollHeight !== 0) {
            addClass(el, "collapse-transition");
            el.style.transitionProperty = "height";
            el.style.height = 0;
            el.style.paddingTop = 0;
            el.style.paddingBottom = 0;
          }
        },
        afterLeave(el) {
          removeClass(el, "collapse-transition");
          el.style.height = "";
          el.style.overflow = el.dataset.oldOverflow;
          el.style.paddingTop = el.dataset.oldPaddingTop;
          el.style.paddingBottom = el.dataset.oldPaddingBottom;
        }
      }
    };
  }
});

function render(_ctx, _cache, $props, $setup, $data, $options) {
  return openBlock(), createBlock(Transition, toHandlers(_ctx.on), {
    default: withCtx(() => [
      renderSlot(_ctx.$slots, "default")
    ]),
    _: 3
  }, 16);
}

script.render = render;
script.__file = "packages/transition/collapse-transition/index.vue";

var index = (app) => {
  app.component(script.name, script);
};

export default index;
export { script as ElCollapseTransition };