<template>
  <div class="layout" :class="{'header-fixed': headerFixed}">
    <slot name="header" v-if="hasHeader"></slot>
    <div class="layout-content-flex">
      <div class="layout-content">
        <slot></slot>
      </div>
    </div>
  </div>
</template>

<script>
import {has} from 'lodash';

export default {
  name: 'Layout',
  data() {
    return {
      hasHeader: false,
      headerFixed: false
    };
  },
  created() {
    if (has(this.$slots, 'header')) {
      this.hasHeader = true;
    }
    if (has(this.$slots, 'header[0].componentOptions.propsData.fixed')) {
      this.headerFixed = true;
    }
  },
};
</script>

<style lang="scss" scoped>
.layout {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  background-color: #fff;
  font-size: 24px;

  &.header-fixed {
    display: block;

    .layout-content {
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      z-index: 1;
    }

    /deep/ .layout-header {
      position: relative;
      z-index: 2;
    }
  }

  .layout-content-flex {
    width: 100%;
    height: 100%;
    flex: 1;
    position: relative;
    overflow: hidden;
    -webkit-overflow-scrolling: touch;

    .layout-content {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
    }
  }
}
</style>