299 lines
		
	
	
		
			9.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			299 lines
		
	
	
		
			9.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
<template>
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	<view class="u-dropdown">
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		<view class="u-dropdown__menu" :style="{
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			height: $u.addUnit(height)
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		}" :class="{
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			'u-border-bottom': borderBottom
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		}">
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			<view class="u-dropdown__menu__item" v-for="(item, index) in menuList" :key="index" @tap.stop="menuClick(index)">
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				<view class="u-flex">
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					<text class="u-dropdown__menu__item__text" :style="{
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						color: item.disabled ? '#c0c4cc' : (index === current || highlightIndex == index) ? activeColor : inactiveColor,
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						fontSize: $u.addUnit(titleSize)
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					}">{{item.title}}</text>
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					<view class="u-dropdown__menu__item__arrow" :class="{
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						'u-dropdown__menu__item__arrow--rotate': index === current
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					}">
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						<u-icon :custom-style="{display: 'flex'}" :name="menuIcon" :size="$u.addUnit(menuIconSize)" :color="index === current || highlightIndex == index ? activeColor : '#c0c4cc'"></u-icon>
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					</view>
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				</view>
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			</view>
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		</view>
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		<view class="u-dropdown__content" :style="[contentStyle, {
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			transition: `opacity ${duration / 1000}s linear`,
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			top: $u.addUnit(height),
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			height: contentHeight + 'px'
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		}]"
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		 @tap="maskClick" @touchmove.stop.prevent>
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			<view @tap.stop.prevent class="u-dropdown__content__popup" :style="[popupStyle]">
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				<slot></slot>
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			</view>
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			<view class="u-dropdown__content__mask"></view>
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		</view>
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	</view>
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</template>
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<script>
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	/**
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	 * dropdown 下拉菜单
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	 * @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
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	 * @tutorial http://uviewui.com/components/dropdown.html
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	 * @property {String} active-color 标题和选项卡选中的颜色(默认#2979ff)
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	 * @property {String} inactive-color 标题和选项卡未选中的颜色(默认#606266)
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	 * @property {Boolean} close-on-click-mask 点击遮罩是否关闭菜单(默认true)
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	 * @property {Boolean} close-on-click-self 点击当前激活项标题是否关闭菜单(默认true)
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	 * @property {String | Number} duration 选项卡展开和收起的过渡时间,单位ms(默认300)
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	 * @property {String | Number} height 标题菜单的高度,单位任意(默认80)
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	 * @property {String | Number} border-radius 菜单展开内容下方的圆角值,单位任意(默认0)
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	 * @property {Boolean} border-bottom 标题菜单是否显示下边框(默认false)
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	 * @property {String | Number} title-size 标题的字体大小,单位任意,数值默认为rpx单位(默认28)
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	 * @event {Function} open 下拉菜单被打开时触发
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	 * @event {Function} close 下拉菜单被关闭时触发
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	 * @example <u-dropdown></u-dropdown>
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	 */
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	export default {
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		name: 'u-dropdown',
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		props: {
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			// 菜单标题和选项的激活态颜色
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			activeColor: {
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				type: String,
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				default: '#2979ff'
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			},
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			// 菜单标题和选项的未激活态颜色
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			inactiveColor: {
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				type: String,
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				default: '#606266'
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			},
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			// 点击遮罩是否关闭菜单
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			closeOnClickMask: {
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				type: Boolean,
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				default: true
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			},
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			// 点击当前激活项标题是否关闭菜单
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			closeOnClickSelf: {
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				type: Boolean,
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				default: true
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			},
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			// 过渡时间
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			duration: {
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				type: [Number, String],
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				default: 300
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			},
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			// 标题菜单的高度,单位任意,数值默认为rpx单位
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			height: {
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				type: [Number, String],
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				default: 80
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			},
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			// 是否显示下边框
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			borderBottom: {
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				type: Boolean,
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				default: false
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			},
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			// 标题的字体大小
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			titleSize: {
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				type: [Number, String],
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				default: 28
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			},
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			// 下拉出来的内容部分的圆角值
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			borderRadius: {
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				type: [Number, String],
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				default: 0
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			},
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			// 菜单右侧的icon图标
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			menuIcon: {
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				type: String,
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				default: 'arrow-down'
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			},
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			// 菜单右侧图标的大小
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			menuIconSize: {
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				type: [Number, String],
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				default: 26
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			}
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		},
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		data() {
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			return {
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				showDropdown: true, // 是否打开下来菜单,
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				menuList: [], // 显示的菜单
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				active: false, // 下拉菜单的状态
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				// 当前是第几个菜单处于激活状态,小程序中此处不能写成false或者"",否则后续将current赋值为0,
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				// 无能的TX没有使用===而是使用==判断,导致程序认为前后二者没有变化,从而不会触发视图更新
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				current: 99999,
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				// 外层内容的样式,初始时处于底层,且透明
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				contentStyle: {
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					zIndex: -1,
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					opacity: 0
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				},
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				// 让某个菜单保持高亮的状态
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				highlightIndex: 99999,
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				contentHeight: 0
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			}
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		},
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		computed: {
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			// 下拉出来部分的样式
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			popupStyle() {
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				let style = {};
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				// 进行Y轴位移,展开状态时,恢复原位。收齐状态时,往上位移100%,进行隐藏
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				style.transform = `translateY(${this.active ? 0 : '-100%'})`
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				style['transition-duration'] = this.duration / 1000 + 's';
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				style.borderRadius = `0 0 ${this.$u.addUnit(this.borderRadius)} ${this.$u.addUnit(this.borderRadius)}`;
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				return style;
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			}
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		},
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		created() {
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			// 引用所有子组件(u-dropdown-item)的this,不能在data中声明变量,否则在微信小程序会造成循环引用而报错
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			this.children = [];
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		},
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		mounted() {
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			this.getContentHeight();
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		},
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		methods: {
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			init() {
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				// 当某个子组件内容变化时,触发父组件的init,父组件再让每一个子组件重新初始化一遍
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				// 以保证数据的正确性
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				this.menuList = [];
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				this.children.map(child => {
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					child.init();
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				})
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			},
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			// 点击菜单
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			menuClick(index) {
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				// 判断是否被禁用
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				if (this.menuList[index].disabled) return;
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				// 如果点击时的索引和当前激活项索引相同,意味着点击了激活项,需要收起下拉菜单
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				if (index === this.current && this.closeOnClickSelf) {
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					this.close();
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					// 等动画结束后,再移除下拉菜单中的内容,否则直接移除,也就没有下拉菜单收起的效果了
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					setTimeout(() => {
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						this.children[index].active = false;
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					}, this.duration)
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					return;
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				}
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				this.open(index);
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			},
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			// 打开下拉菜单
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			open(index) {
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				// 重置高亮索引,否则会造成多个菜单同时高亮
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				// this.highlightIndex = 9999;
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				// 展开时,设置下拉内容的样式
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				this.contentStyle = {
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					zIndex: 11,
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				}
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				// 标记展开状态以及当前展开项的索引
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				this.active = true;
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				this.current = index;
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				// 历遍所有的子元素,将索引匹配的项标记为激活状态,因为子元素是通过v-if控制切换的
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				// 之所以不是因display: none,是因为nvue没有display这个属性
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				this.children.map((val, idx) => {
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					val.active = index == idx ? true : false;
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				})
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				this.$emit('open', this.current);
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			},
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			// 设置下拉菜单处于收起状态
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			close() {
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				this.$emit('close', this.current);
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				// 设置为收起状态,同时current归位,设置为空字符串
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				this.active = false;
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				this.current = 99999;
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				// 下拉内容的样式进行调整,不透明度设置为0
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				this.contentStyle = {
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					zIndex: -1,
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					opacity: 0
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				}
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			},
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			// 点击遮罩
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			maskClick() {
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				// 如果不允许点击遮罩,直接返回
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				if (!this.closeOnClickMask) return;
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				this.close();
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			},
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			// 外部手动设置某个菜单高亮
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			highlight(index = undefined) {
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				this.highlightIndex = index !== undefined ? index : 99999;
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			},
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			// 获取下拉菜单内容的高度
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			getContentHeight() {
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				// 这里的原理为,因为dropdown组件是相对定位的,它的下拉出来的内容,必须给定一个高度
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				// 才能让遮罩占满菜单一下,直到屏幕底部的高度
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				// this.$u.sys()为uView封装的获取设备信息的方法
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				let windowHeight = this.$u.sys().windowHeight;
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				this.$uGetRect('.u-dropdown__menu').then(res => {
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					// 这里获取的是dropdown的尺寸,在H5上,uniapp获取尺寸是有bug的(以前提出修复过,后来又出现了此bug,目前hx2.8.11版本)
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					// H5端bug表现为元素尺寸的top值为导航栏底部到到元素的上边沿的距离,但是元素的bottom值确是导航栏顶部到元素底部的距离
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					// 二者是互相矛盾的,本质原因是H5端导航栏非原生,uni的开发者大意造成
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					// 这里取菜单栏的botton值合理的,不能用res.top,否则页面会造成滚动
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					this.contentHeight = windowHeight - res.bottom;
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				})
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			}
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		}
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	}
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</script>
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<style scoped lang="scss">
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	@import "../../libs/css/style.components.scss";
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	.u-dropdown {
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		flex: 1;
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		width: 100%;
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		position: relative;
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		&__menu {
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			@include vue-flex;
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			position: relative;
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			z-index: 11;
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			height: 80rpx;
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			&__item {
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				flex: 1;
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				@include vue-flex;
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				justify-content: center;
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				align-items: center;
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				&__text {
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					font-size: 28rpx;
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					color: $u-content-color;
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				}
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				&__arrow {
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					margin-left: 6rpx;
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					transition: transform .3s;
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					align-items: center;
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					@include vue-flex;
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					&--rotate {
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						transform: rotate(180deg);
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					}
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				}
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			}
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		}
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		&__content {
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			position: absolute;
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			z-index: 8;
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			width: 100%;
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			left: 0px;
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			bottom: 0;
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			overflow: hidden;
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			&__mask {
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				position: absolute;
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				z-index: 9;
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				background: rgba(0, 0, 0, .3);
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				width: 100%;
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				left: 0;
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				top: 0;
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				bottom: 0;
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			}
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			&__popup {
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				position: relative;
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				z-index: 10;
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				transition: all 0.3s;
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				transform: translate3D(0, -100%, 0);
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				overflow: hidden;
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			}
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		}
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	}
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</style>
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