226 lines
		
	
	
		
			6.5 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
			
		
		
	
	
			226 lines
		
	
	
		
			6.5 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
<template>
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	<view class="u-collapse-item">
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		<u-cell
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			:title="title"
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			:value="value"
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			:label="label"
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			:icon="icon"
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			:isLink="isLink"
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			:clickable="clickable"
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			:border="parentData.border && showBorder"
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			@click="clickHandler"
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			:arrowDirection="expanded ? 'up' : 'down'"
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			:disabled="disabled"
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		>
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			<!-- #ifndef MP-WEIXIN -->
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			<!-- 微信小程序不支持,因为微信中不支持 <slot name="title" slot="title" />的写法 -->
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			<template slot="title">
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				<slot name="title"></slot>
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			</template>
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			<template slot="icon">
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				<slot name="icon"></slot>
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			</template>
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			<template slot="value">
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				<slot name="value"></slot>
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			</template>
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			<template slot="right-icon">
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				<slot name="right-icon"></slot>
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			</template>
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			<!-- #endif -->
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		</u-cell>
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		<view
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			class="u-collapse-item__content"
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			:animation="animationData"
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			ref="animation"
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		>
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			<view
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				class="u-collapse-item__content__text content-class"
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				:id="elId"
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				:ref="elId"
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			><slot /></view>
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		</view>
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		<u-line v-if="parentData.border"></u-line>
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	</view>
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</template>
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<script>
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	import props from './props.js';
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	// #ifdef APP-NVUE
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	const animation = uni.requireNativePlugin('animation')
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	const dom = uni.requireNativePlugin('dom')
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	// #endif
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	/**
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	 * collapseItem 折叠面板Item
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	 * @description 通过折叠面板收纳内容区域(搭配u-collapse使用)
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	 * @tutorial https://www.uviewui.com/components/collapse.html
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	 * @property {String}			title 		标题
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	 * @property {String}			value 		标题右侧内容
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	 * @property {String}			label 		标题下方的描述信息
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	 * @property {Boolean}			disbled 	是否禁用折叠面板 ( 默认 false )
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	 * @property {Boolean}			isLink 		是否展示右侧箭头并开启点击反馈 ( 默认 true )
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	 * @property {Boolean}			clickable	是否开启点击反馈 ( 默认 true )
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	 * @property {Boolean}			border		是否显示内边框 ( 默认 true )
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	 * @property {String}			align		标题的对齐方式 ( 默认 'left' )
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	 * @property {String | Number}	name		唯一标识符
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	 * @property {String}			icon		标题左侧图片,可为绝对路径的图片或内置图标
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	 * @event {Function}			change 			某个item被打开或者收起时触发
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	 * @example <u-collapse-item :title="item.head" v-for="(item, index) in itemList" :key="index">{{item.body}}</u-collapse-item>
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	 */
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	export default {
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		name: "u-collapse-item",
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		mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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		data() {
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			return {
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				elId: uni.$u.guid(),
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				// uni.createAnimation的导出数据
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				animationData: {},
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				// 是否展开状态
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				expanded: false,
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				// 根据expanded确定是否显示border,为了控制展开时,cell的下划线更好的显示效果,进行一定时间的延时
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				showBorder: false,
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				// 是否动画中,如果是则不允许继续触发点击
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				animating: false,
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				// 父组件u-collapse的参数
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				parentData: {
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					accordion: false,
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					border: false
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				}
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			};
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		},
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		watch: {
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			expanded(n) {
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				clearTimeout(this.timer)
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				this.timer = null
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				// 这里根据expanded的值来进行一定的延时,是为了cell的下划线更好的显示效果
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				this.timer = setTimeout(() => {
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					this.showBorder = n
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				}, n ? 10 : 290)
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			}
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		},
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		mounted() {
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			this.init()
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		},
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		methods: {
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			// 异步获取内容,或者动态修改了内容时,需要重新初始化
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			init() {
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				// 初始化数据
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				this.updateParentData()
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				if (!this.parent) {
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					return uni.$u.error('u-collapse-item必须要搭配u-collapse组件使用')
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				}
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				const {
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					value,
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					accordion,
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					children = []
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				} = this.parent
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				if (accordion) {
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					if (uni.$u.test.array(value)) {
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						return uni.$u.error('手风琴模式下,u-collapse组件的value参数不能为数组')
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					}
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					this.expanded = this.name == value
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				} else {
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					if (!uni.$u.test.array(value) && value !== null) {
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						return uni.$u.error('非手风琴模式下,u-collapse组件的value参数必须为数组')
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					}
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					this.expanded = (value || []).some(item => item == this.name)
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				}
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				// 设置组件的展开或收起状态
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				this.$nextTick(function() {
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					this.setContentAnimate()
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				})
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			},
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			updateParentData() {
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				// 此方法在mixin中
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				this.getParentData('u-collapse')
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			},
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			async setContentAnimate() {
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				// 每次面板打开或者收起时,都查询元素尺寸
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				// 好处是,父组件从服务端获取内容后,变更折叠面板后可以获得最新的高度
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				const rect = await this.queryRect()
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				const height = this.expanded ? rect.height : 0
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				this.animating = true
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				// #ifdef APP-NVUE
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				const ref = this.$refs['animation'].ref
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				animation.transition(ref, {
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					styles: {
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						height: height + 'px'
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					},
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					duration: this.duration,
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					// 必须设置为true,否则会到面板收起或展开时,页面其他元素不会随之调整它们的布局
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					needLayout: true,
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					timingFunction: 'ease-in-out',
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				}, () => {
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					this.animating = false
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				})
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				// #endif
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				// #ifndef APP-NVUE
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				const animation = uni.createAnimation({
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					timingFunction: 'ease-in-out',
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				});
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				animation
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					.height(height)
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					.step({
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						duration: this.duration,
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					})
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					.step()
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				// 导出动画数据给面板的animationData值
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				this.animationData = animation.export()
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				// 标识动画结束
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				uni.$u.sleep(this.duration).then(() => {
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					this.animating = false
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				})
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				// #endif
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			},
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			// 点击collapsehead头部
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			clickHandler() {
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				if (this.disabled && this.animating) return
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				// 设置本组件为相反的状态
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				this.parent && this.parent.onChange(this)
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			},
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			// 查询内容高度
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			queryRect() {
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				// #ifndef APP-NVUE
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				// $uGetRect为uView自带的节点查询简化方法,详见文档介绍:https://www.uviewui.com/js/getRect.html
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				// 组件内部一般用this.$uGetRect,对外的为uni.$u.getRect,二者功能一致,名称不同
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				return new Promise(resolve => {
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					this.$uGetRect(`#${this.elId}`).then(size => {
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						resolve(size)
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					})
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				})
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				// #endif
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				// #ifdef APP-NVUE
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				// nvue下,使用dom模块查询元素高度
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				// 返回一个promise,让调用此方法的主体能使用then回调
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				return new Promise(resolve => {
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					dom.getComponentRect(this.$refs[this.elId], res => {
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						resolve(res.size)
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					})
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				})
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				// #endif
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			}
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		},
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	};
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</script>
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<style lang="scss" scoped>
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	@import "../../libs/css/components.scss";
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	.u-collapse-item {
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		&__content {
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			overflow: hidden;
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			height: 0;
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			&__text {
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				padding: 12px 15px;
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				color: $u-content-color;
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				font-size: 14px;
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				line-height: 18px;
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			}
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		}
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	}
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</style>
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