<template>
  <div class="layout">
    <slot name="header" v-if="hasHeader"></slot>
    <div class="layout-content">
      <Scroll ref="scroll" :options="scrollOption" @pulling-up="onPullingUp" @pulling-down="onPullingDown">
        <slot></slot>
      </Scroll>
    </div>
  </div>
</template>

<script>
import {Scroll} from 'cube-ui';

export default {
  name: 'Layout',
  props: {
    scrollOption: {
      type: Object,
      default() {
        return {
          pullDownRefresh: true,
          observeDOM: false,
          pullUpLoad: true
        };
      }
    }
  },
  data() {
    return {
      hasHeader: false,
    };
  },
  mounted() {
    if (this.$slots.header) {
      this.hasHeader = true;
    }
  },
  methods: {
    onPullingUp(evt) {
      this.$emit('pulling-up', evt);
    },
    onPullingDown(evt) {
      this.$emit('pulling-down', evt);
    },
  },
  components: {Scroll}
};
</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;

  .layout-content {
    flex: 1;
    overflow: hidden;
  }
}
</style>