<template>
    <view class="u-grid-item" :hover-class="parentData.hoverClass"
     :hover-stay-time="200" @tap="click" :style="{
            background: bgColor,
            width: width,
        }">
        <view class="u-grid-item-box" :style="[customStyle]" :class="[parentData.border ? 'u-border-right u-border-bottom' : '']">
            <slot />
        </view>
    </view>
</template>

<script>
    /**
     * gridItem 提示
     * @description 宫格组件一般用于同时展示多个同类项目的场景,可以给宫格的项目设置徽标组件(badge),或者图标等,也可以扩展为左右滑动的轮播形式。搭配u-grid使用
     * @tutorial https://www.uviewui.com/components/grid.html
     * @property {String} bg-color 宫格的背景颜色(默认#ffffff)
     * @property {String Number} index 点击宫格时,返回的值
     * @property {Object} custom-style 自定义样式,对象形式
     * @event {Function} click 点击宫格触发
     * @example <u-grid-item></u-grid-item>
     */
    export default {
        name: "u-grid-item",
        props: {
            // 背景颜色
            bgColor: {
                type: String,
                default: '#ffffff'
            },
            // 点击时返回的index
            index: {
                type: [Number, String],
                default: ''
            },
            // 自定义样式,对象形式
            customStyle: {
                type: Object,
                default() {
                    return {
                        padding: '30rpx 0'
                    }
                }
            }
        },
        data() {
            return {
                parentData: {
                    hoverClass: '', // 按下去的时候,是否显示背景灰色
                    col: 3, // 父组件划分的宫格数
                    border: true, // 是否显示边框,根据父组件决定
                }
            };
        },
        created() {
            // 父组件的实例
            this.updateParentData();
            // this.parent在updateParentData()中定义
            this.parent.children.push(this);
        },
        computed: {
            // 每个grid-item的宽度
            width() {
                return 100 / Number(this.parentData.col) + '%';
            },
        },
        methods: {
            // 获取父组件的参数
            updateParentData() {
                // 此方法写在mixin中
                this.getParentData('u-grid');
            },
            click() {
                this.$emit('click', this.index);
                this.parent && this.parent.click(this.index);
            }
        }
    };
</script>

<style scoped lang="scss">
    @import "../../libs/css/style.components.scss";
    
    .u-grid-item {
        box-sizing: border-box;
        background: #fff;
        @include vue-flex;
        align-items: center;
        justify-content: center;
        position: relative;
        flex-direction: column;
        
        /* #ifdef MP */
        position: relative;
        float: left;
        /* #endif */
    }

    .u-grid-item-hover {
        background: #f7f7f7 !important;
    }

    .u-grid-marker-box {
        position: absolute;
        /* #ifndef APP-NVUE */
        display: inline-flex;        
        /* #endif */
        line-height: 0;
    }

    .u-grid-marker-wrap {
        position: absolute;
    }

    .u-grid-item-box {
        padding: 30rpx 0;
        @include vue-flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        flex: 1;
        width: 100%;
        height: 100%;
    }
</style>