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zhangwei
2025-03-06 8c047f7da19d7e59136a322e1a851d4b6b0eab97
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<template>
    <view class="u-dropdown-item" v-if="active" @touchmove.stop.prevent="() => {}" @tap.stop.prevent="() => {}">
        <block v-if="!$slots.default && !$slots.$default">
            <scroll-view class="u-dropdown-item__scroll" scroll-y="true" :style="{
                height: addUnit(height)
            }">
                <view class="u-dropdown-item__options">
                    <up-cell-group>
                        <up-cell @click="cellClick(item.value)" :arrow="false" :title="item.label" v-for="(item, index) in options"
                         :key="index" :title-style="{
                            color: modelValue == item.value ? activeColor : inactiveColor
                        }">
                            <up-icon v-if="modelValue == item.value" name="checkbox-mark" :color="activeColor" size="32"></up-icon>
                        </up-cell>
                    </up-cell-group>
                </view>
            </scroll-view>
        </block>
        <slot v-else />
    </view>
</template>
 
<script>
    import { props } from './props';
    import { mpMixin } from '../../libs/mixin/mpMixin';
    import { mixin } from '../../libs/mixin/mixin';
    import { addUnit, $parent } from '../../libs/function/index';
    /**
     * dropdown-item 下拉菜单
     * @description 该组件一般用于向下展开菜单,同时可切换多个选项卡的场景
     * @tutorial https://ijry.github.io/uview-plus/components/dropdown.html
     * @property {String | Number} v-model 双向绑定选项卡选择值
     * @property {String} title 菜单项标题
     * @property {Array[Object]} options 选项数据,如果传入了默认slot,此参数无效
     * @property {Boolean} disabled 是否禁用此选项卡(默认false)
     * @property {String | Number} duration 选项卡展开和收起的过渡时间,单位ms(默认300)
     * @property {String | Number} height 弹窗下拉内容的高度(内容超出将会滚动)(默认auto)
     * @example <u-dropdown-item title="标题"></u-dropdown-item>
     */
    export default {
        name: 'u-dropdown-item',
        mixins: [mpMixin, mixin, props],
        options: {
            styleIsolation: 'shared',
        },
        data() {
            return {
                active: false, // 当前项是否处于展开状态
                activeColor: '#2979ff', // 激活时左边文字和右边对勾图标的颜色
                inactiveColor: '#606266', // 未激活时左边文字和右边对勾图标的颜色
            }
        },
        computed: {
            // 监听props是否发生了变化,有些值需要传递给父组件u-dropdown,无法双向绑定
            propsChange() {
                return `${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;
        },
        emits: ['update:modelValue', 'change'],
        methods: {
            addUnit,
            init() {
                // 获取父组件u-dropdown
                let parent = $parent.call(this, 'u-dropdown');
                if (parent) {
                    this.parent = parent;
                    // 将子组件的激活颜色配置为父组件设置的激活和未激活时的颜色
                    this.activeColor = parent.activeColor;
                    this.inactiveColor = parent.inactiveColor;
                    // 将本组件的this,放入到父组件的children数组中,让父组件可以操作本(子)组件的方法和属性
                    // push进去前,显判断是否已经存在了本实例,因为在子组件内部数据变化时,会通过父组件重新初始化子组件
                    let exist = parent.children.find(val => {
                        return this === val;
                    })
                    if (!exist) parent.children.push(this);
                    if (parent.children.length == 1) this.active = true;
                    // 父组件无法监听children的变化,故将子组件的title,传入父组件的menuList数组中
                    parent.menuList.push({
                        title: this.title,
                        disabled: this.disabled
                    });
                }
            },
            // cell被点击
            cellClick(value) {
                // 修改通过v-model绑定的值
                // #ifdef VUE2
                this.$emit('input', value);
                // #endif
                // #ifdef VUE3
                this.$emit('update:modelValue', value);
                // #endif
                // 通知父组件(u-dropdown)收起菜单
                this.parent.close();
                // 发出事件,抛出当前勾选项的value
                this.$emit('change', value);
            }
        },
        mounted() {
            this.init();
        }
    }
</script>
 
<style scoped lang="scss">
    @import "../../libs/css/components.scss";
    .u-dropdown-item__scroll {
        background: #ffffff;
    }
</style>