zhangmeng
2024-04-19 e3ba120cb766a17e098e58d11c39ffc600a3070c
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<template>
    <view
        class="u-grid"
        ref='u-grid'
        :style="[gridStyle]"
    >
        <slot />
    </view>
</template>
 
<script>
    import props from './props.js';
    /**
     * grid 宫格布局
     * @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。
     * @tutorial https://www.uviewui.com/components/grid.html
     * @property {String | Number}    col            宫格的列数(默认 3 )
     * @property {Boolean}            border        是否显示宫格的边框(默认 false )
     * @property {String}            align        宫格对齐方式,表现为数量少的时候,靠左,居中,还是靠右 (默认 'left' )
     * @property {Object}            customStyle    定义需要用到的外部样式
     * @event {Function} click 点击宫格触发
     * @example <u-grid :col="3" @click="click"></u-grid>
     */
    export default {
        name: 'u-grid',
        mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
        data() {
            return {
                index: 0,
                width: 0
            }
        },
        watch: {
            // 当父组件需要子组件需要共享的参数发生了变化,手动通知子组件
            parentData() {
                if (this.children.length) {
                    this.children.map(child => {
                        // 判断子组件(u-radio)如果有updateParentData方法的话,就就执行(执行的结果是子组件重新从父组件拉取了最新的值)
                        typeof(child.updateParentData) == 'function' && child.updateParentData();
                    })
                }
            },
        },
        created() {
            // 如果将children定义在data中,在微信小程序会造成循环引用而报错
            this.children = []
        },
        computed: {
            // 计算父组件的值是否发生变化
            parentData() {
                return [this.hoverClass, this.col, this.size, this.border];
            },
            // 宫格对齐方式
            gridStyle() {
                let style = {};
                switch (this.align) {
                    case 'left':
                        style.justifyContent = 'flex-start';
                        break;
                    case 'center':
                        style.justifyContent = 'center';
                        break;
                    case 'right':
                        style.justifyContent = 'flex-end';
                        break;
                    default:
                        style.justifyContent = 'flex-start';
                };
                return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle));
            }
        },
        methods: {
            // 此方法由u-grid-item触发,用于在u-grid发出事件
            childClick(name) {
                this.$emit('click', name)
            }
        }
    };
</script>
 
<style lang="scss" scoped>
    @import "../../libs/css/components.scss";
     $u-grid-width:100% !default;
    .u-grid {
        /* #ifdef MP */
        width: $u-grid-width;
        position: relative;
        box-sizing: border-box;
        overflow: hidden;
        display: block;
        /* #endif */
        justify-content: center;
        @include flex;
        flex-wrap: wrap;
        align-items: center;
    }
</style>