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uni_modules/uview-plus/components/u-dropdown-item/u-dropdown-item.vue 4.28 KB
a2702f6d   刘淇   巡查计划
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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, $parent } from '../../libs/function/index';
  	/**
  	 * dropdown-item 下拉菜单
  	 * @description 该组件一般用于向下展开菜单,同时可切换多个选项卡的场景
  	 * @tutorial https://uview-plus.jiangruyi.com/components/dropdown.html
  	 * @property {String | Number} v-model 双向绑定选项卡选择值
  	 * @property {String} title 菜单项标题
  	 * @property {Array[Object]} options 选项数据,如果传入了默认slot,此参数无效
  	 * @property {Boolean} disabled 是否禁用此选项卡(默认false
  	 * @property {String | Number} duration 选项卡展开和收起的过渡时间,单位ms(默认300
  	 * @property {String | Number} height 弹窗下拉内容的高度(内容超出将会滚动)(默认auto
  	 * @example <u-dropdown-item title="标题"></u-dropdown-item>
  	 */
  	export default {
  		name: 'u-dropdown-item',
  		mixins: [mpMixin, mixin, props],
          options: {
              styleIsolation: 'shared',
          },
  		data() {
  			return {
  				active: false, // 当前项是否处于展开状态
  				activeColor: '#2979ff', // 激活时左边文字和右边对勾图标的颜色
  				inactiveColor: '#606266', // 未激活时左边文字和右边对勾图标的颜色
  			}
  		},
  		computed: {
  			// 监听props是否发生了变化,有些值需要传递给父组件u-dropdown,无法双向绑定
  			propsChange() {
  				return `${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">
      .u-dropdown-item__scroll {
          background: #ffffff;
      }
  </style>