<template>
    <div class="layout">
        <div class="layout-header" v-if="!hideHeader">
            <slot name="header" ref="header"></slot>
        </div>
        <div class="layout-content" ref="content" :class="{'top-header': !autoHideHeader && !hideHeader}">
            <slot></slot>
        </div>
    </div>
</template>

<script>
import {mapState} from 'vuex';

export default {
    name: 'LayoutBody',
    data() {
        return {
            autoHideHeader: false,
            hideHeader: false,
        };
    },
    computed: {
        ...mapState(['yoho'])
    },
    mounted() {
        if (this.autoHideHeader) {
            window.addEventListener('touchmove', this.toggle);
            this.$refs.content.addEventListener('scroll', this.toggle);
        }
    },
    methods: {
        toggle() {
            if (this.$refs.content.scrollTop < 70) {
                this.$slots.header[0].componentInstance.switchBase();
            } else {
                this.$slots.header[0].componentInstance.switchNormal();
            }
        }
    },
    created() {
        if (this.$slots.header && this.$slots.header.length) {
            this.autoHideHeader = this.$slots.header[0].componentOptions.propsData.autoHide;
        } else {
            this.hideHeader = true;
        }
    }
};
</script>

<style lang="scss">
@import "~scss/variable.scss";
.layout {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;

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

    .layout-content {
        position: absolute;
        top: 0;
        right: 0;
        left: 0;
        bottom: 0;
        overflow-y: auto;
        z-index: 1;
        -webkit-overflow-scrolling: touch;

        &.top-header {
            top: $header-height;
        }
    }
}
</style>