刘磊
2025-04-19 2f18780a16a68f7fc67dd3bca61b8d0aed7c8e1a
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<template>
    <view class="u-dropdown-item" v-if="active" @touchmove.stop.prevent @tap.stop.prevent>
        <view class="u-dropdown-item__options" v-if="!$slots.default">
            <u-cell-group>
                <u-cell-item @click="cellClick(item.value)" :arrow="false" :title="item.label" v-for="(item, index) in options" :key="index" :title-style="{
                    color: value == item.value ? activeColor : inactiveColor
                }">
                    <u-icon v-if="value == item.value" name="checkbox-mark" :color="activeColor" size="32"></u-icon>
                </u-cell-item>
            </u-cell-group>
        </view>
        <slot v-else />
    </view>
</template>
 
<script>
    export default {
        name: 'u-dropdown-item',
        props: {
            // 当前选中项的value值
            value: {
                type: [Number, String, Array],
                default: ''
            },
            // 菜单项标题
            title: {
                type: [String, Number],
                default: ''
            },
            // 选项数据,如果传入了默认slot,此参数无效
            options: {
                type: Array,
                default () {
                    return []
                }
            },
            // 是否禁用此菜单项
            disabled: {
                type: Boolean,
                default: false
            },
        },
        data() {
            return {
                active: false, // 当前项是否处于展开状态
                activeColor: '#2979ff', // 激活时左边文字和右边对勾图标的颜色
                inactiveColor: '#606266', // 未激活时左边文字和右边对勾图标的颜色
            }
        },
        computed: {
            // 监听props是否发生了变化,有些值需要传递给父组件u-dropdown,无法双向绑定
            propsChange() {
                return `${this.title}-${this.disabled}`;
            }
        },
        watch: {
            propsChange(n) {
                // 当值变化时,通知父组件重新初始化,让父组件执行每个子组件的init()方法
                // 将所有子组件数据重新整理一遍
                if(this.parent) this.parent.init();
            }
        },
        created() {
            // 父组件的实例
            this.parent = false;
        },
        methods: {
            init() {
                // 获取父组件u-dropdown
                let parent = this.$u.$parent.call(this, 'u-dropdown');
                if(parent) {
                    this.parent = parent;
                    // 将子组件的激活颜色配置为父组件设置的激活和未激活时的颜色
                    this.activeColor = parent.activeColor;
                    this.inactiveColor = parent.inactiveColor;
                    // 将本组件的this,放入到父组件的children数组中,让父组件可以操作本(子)组件的方法和属性
                    // push进去前,显判断是否已经存在了本实例,因为在子组件内部数据变化时,会通过父组件重新初始化子组件
                    let exist = parent.children.find(val => {
                        return this === val;
                    })
                    if(!exist) parent.children.push(this);
                    if(parent.children.length == 1) this.active = true;
                    // 父组件无法监听children的变化,故将子组件的title,传入父组件的menuList数组中
                    parent.menuList.push({
                        title: this.title,
                        disabled: this.disabled
                    });
                }
            },
            // cell被点击
            cellClick(value) {
                // 修改通过v-model绑定的值
                this.$emit('input', value);
                // 通知父组件(u-dropdown)收起菜单
                this.parent.close();
                // 发出事件,抛出当前勾选项的value
                this.$emit('change', value);
            }
        },
        mounted() {
            this.init();
        }
    }
</script>
 
<style scoped lang="scss">
    @import "../../libs/css/style.components.scss";
</style>