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	uni-app引入使用uView
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		| @@ -0,0 +1,212 @@ | ||||
| <template> | ||||
| 	<view | ||||
| 		class="u-sticky" | ||||
| 		:id="elId" | ||||
| 		:style="[style]" | ||||
| 	> | ||||
| 		<view | ||||
| 			:style="[stickyContent]" | ||||
| 			class="u-sticky__content" | ||||
| 		> | ||||
| 			<slot /> | ||||
| 		</view> | ||||
| 	</view> | ||||
| </template> | ||||
|  | ||||
| <script> | ||||
| 	import props from './props.js';; | ||||
| 	/** | ||||
| 	 * sticky 吸顶 | ||||
| 	 * @description 该组件与CSS中position: sticky属性实现的效果一致,当组件达到预设的到顶部距离时, 就会固定在指定位置,组件位置大于预设的顶部距离时,会重新按照正常的布局排列。 | ||||
| 	 * @tutorial https://www.uviewui.com/components/sticky.html | ||||
| 	 * @property {String | Number}	offsetTop		吸顶时与顶部的距离,单位px(默认 0 ) | ||||
| 	 * @property {String | Number}	customNavHeight	自定义导航栏的高度 (h5 默认44  其他默认 0 ) | ||||
| 	 * @property {Boolean}			disabled		是否开启吸顶功能 (默认 false ) | ||||
| 	 * @property {String}			bgColor			组件背景颜色(默认 '#ffffff' ) | ||||
| 	 * @property {String | Number}	zIndex			吸顶时的z-index值 | ||||
| 	 * @property {String | Number}	index			自定义标识,用于区分是哪一个组件 | ||||
| 	 * @property {Object}			customStyle		组件的样式,对象形式 | ||||
| 	 * @event {Function} fixed		组件吸顶时触发 | ||||
| 	 * @event {Function} unfixed	组件取消吸顶时触发 | ||||
| 	 * @example <u-sticky offsetTop="200"><view>塞下秋来风景异,衡阳雁去无留意</view></u-sticky> | ||||
| 	 */ | ||||
| 	export default { | ||||
| 		name: 'u-sticky', | ||||
| 		mixins: [uni.$u.mpMixin, uni.$u.mixin, props], | ||||
| 		data() { | ||||
| 			return { | ||||
| 				cssSticky: false, // 是否使用css的sticky实现 | ||||
| 				stickyTop: 0, // 吸顶的top值,因为可能受自定义导航栏影响,最终的吸顶值非offsetTop值 | ||||
| 				elId: uni.$u.guid(), | ||||
| 				left: 0, // js模式时,吸顶的内容因为处于postition: fixed模式,为了和原来保持一致的样式,需要记录并重新设置它的left,height,width属性 | ||||
| 				width: 'auto', | ||||
| 				height: 'auto', | ||||
| 				fixed: false, // js模式时,是否处于吸顶模式 | ||||
| 			} | ||||
| 		}, | ||||
| 		computed: { | ||||
| 			style() { | ||||
| 				const style = {} | ||||
| 				if(!this.disabled) { | ||||
| 					if (this.cssSticky) { | ||||
| 						style.position = 'sticky' | ||||
| 						style.zIndex = this.uZindex | ||||
| 						style.top = uni.$u.addUnit(this.stickyTop) | ||||
| 					} else { | ||||
| 						style.height = this.fixed ? this.height + 'px' : 'auto' | ||||
| 					} | ||||
| 				} else { | ||||
| 					// 无需吸顶时,设置会默认的relative(nvue)和非nvue的static静态模式即可 | ||||
| 					// #ifdef APP-NVUE | ||||
| 					style.position = 'relative' | ||||
| 					// #endif | ||||
| 					// #ifndef APP-NVUE | ||||
| 					style.position = 'static' | ||||
| 					// #endif | ||||
| 				} | ||||
| 				style.backgroundColor = this.bgColor | ||||
| 				return uni.$u.deepMerge(uni.$u.addStyle(this.customStyle), style) | ||||
| 			}, | ||||
| 			// 吸顶内容的样式 | ||||
| 			stickyContent() { | ||||
| 				const style = {} | ||||
| 				if (!this.cssSticky) { | ||||
| 					style.position = this.fixed ? 'fixed' : 'static' | ||||
| 					style.top = this.stickyTop + 'px' | ||||
| 					style.left = this.left + 'px' | ||||
| 					style.width = this.width == 'auto' ? 'auto' : this.width + 'px' | ||||
| 					style.zIndex = this.uZindex | ||||
| 				} | ||||
| 				return style | ||||
| 			}, | ||||
| 			uZindex() { | ||||
| 				return this.zIndex ? this.zIndex : uni.$u.zIndex.sticky | ||||
| 			} | ||||
| 		}, | ||||
| 		mounted() { | ||||
| 			this.init() | ||||
| 		}, | ||||
| 		methods: { | ||||
| 			init() { | ||||
| 				this.getStickyTop() | ||||
| 				// 判断使用的模式 | ||||
| 				this.checkSupportCssSticky() | ||||
| 				// 如果不支持css sticky,则使用js方案,此方案性能比不上css方案 | ||||
| 				if (!this.cssSticky) { | ||||
| 					!this.disabled && this.initObserveContent() | ||||
| 				} | ||||
| 			}, | ||||
| 			initObserveContent() { | ||||
| 				// 获取吸顶内容的高度,用于在js吸顶模式时,给父元素一个填充高度,防止"塌陷" | ||||
| 				this.$uGetRect('#' + this.elId).then((res) => { | ||||
| 					this.height = res.height | ||||
| 					this.left = res.left | ||||
| 					this.width = res.width | ||||
| 					this.$nextTick(() => { | ||||
| 						this.observeContent() | ||||
| 					}) | ||||
| 				}) | ||||
| 			}, | ||||
| 			observeContent() { | ||||
| 				// 先断掉之前的观察 | ||||
| 				this.disconnectObserver('contentObserver') | ||||
| 				const contentObserver = uni.createIntersectionObserver({ | ||||
| 					// 检测的区间范围 | ||||
| 					thresholds: [0.95, 0.98, 1] | ||||
| 				}) | ||||
| 				// 到屏幕顶部的高度时触发 | ||||
| 				contentObserver.relativeToViewport({ | ||||
| 					top: -this.stickyTop | ||||
| 				}) | ||||
| 				// 绑定观察的元素 | ||||
| 				contentObserver.observe(`#${this.elId}`, res => { | ||||
| 					this.setFixed(res.boundingClientRect.top) | ||||
| 				}) | ||||
| 				this.contentObserver = contentObserver | ||||
| 			}, | ||||
| 			setFixed(top) { | ||||
| 				// 判断是否出于吸顶条件范围 | ||||
| 				const fixed = top <= this.stickyTop | ||||
| 				this.fixed = fixed | ||||
| 			}, | ||||
| 			disconnectObserver(observerName) { | ||||
| 				// 断掉观察,释放资源 | ||||
| 				const observer = this[observerName] | ||||
| 				observer && observer.disconnect() | ||||
| 			}, | ||||
| 			getStickyTop() { | ||||
| 				this.stickyTop = uni.$u.getPx(this.offsetTop) + uni.$u.getPx(this.customNavHeight) | ||||
| 			}, | ||||
| 			async checkSupportCssSticky() { | ||||
| 				// #ifdef H5 | ||||
| 				// H5,一般都是现代浏览器,是支持css sticky的,这里使用创建元素嗅探的形式判断 | ||||
| 				if (this.checkCssStickyForH5()) { | ||||
| 					this.cssSticky = true | ||||
| 				} | ||||
| 				// #endif | ||||
|  | ||||
| 				// 如果安卓版本高于8.0,依然认为是支持css sticky的(因为安卓7在某些机型,可能不支持sticky) | ||||
| 				if (uni.$u.os() === 'android' && Number(uni.$u.sys().system) > 8) { | ||||
| 					this.cssSticky = true | ||||
| 				} | ||||
|  | ||||
| 				// APP-Vue和微信平台,通过computedStyle判断是否支持css sticky | ||||
| 				// #ifdef APP-VUE || MP-WEIXIN | ||||
| 				this.cssSticky = await this.checkComputedStyle() | ||||
| 				// #endif | ||||
|  | ||||
| 				// ios上,从ios6开始,都是支持css sticky的 | ||||
| 				if (uni.$u.os() === 'ios') { | ||||
| 					this.cssSticky = true | ||||
| 				} | ||||
|  | ||||
| 				// nvue,是支持css sticky的 | ||||
| 				// #ifdef APP-NVUE | ||||
| 				this.cssSticky = true | ||||
| 				// #endif | ||||
| 			}, | ||||
| 			// 在APP和微信小程序上,通过uni.createSelectorQuery可以判断是否支持css sticky | ||||
| 			checkComputedStyle() { | ||||
| 				// 方法内进行判断,避免在其他平台生成无用代码 | ||||
| 				// #ifdef APP-VUE || MP-WEIXIN | ||||
| 				return new Promise(resolve => { | ||||
| 					uni.createSelectorQuery().in(this).select('.u-sticky').fields({ | ||||
| 						computedStyle: ["position"] | ||||
| 					}).exec(e => { | ||||
| 						resolve('sticky' === e[0].position) | ||||
| 					}) | ||||
| 				}) | ||||
| 				// #endif | ||||
| 			}, | ||||
| 			// H5通过创建元素的形式嗅探是否支持css sticky | ||||
| 			// 判断浏览器是否支持sticky属性 | ||||
| 			checkCssStickyForH5() { | ||||
| 				// 方法内进行判断,避免在其他平台生成无用代码 | ||||
| 				// #ifdef H5 | ||||
| 				const vendorList = ['', '-webkit-', '-ms-', '-moz-', '-o-'], | ||||
| 					vendorListLength = vendorList.length, | ||||
| 					stickyElement = document.createElement('div') | ||||
| 				for (let i = 0; i < vendorListLength; i++) { | ||||
| 					stickyElement.style.position = vendorList[i] + 'sticky' | ||||
| 					if (stickyElement.style.position !== '') { | ||||
| 						return true | ||||
| 					} | ||||
| 				} | ||||
| 				return false; | ||||
| 				// #endif | ||||
| 			} | ||||
| 		}, | ||||
| 		beforeDestroy() { | ||||
| 			this.disconnectObserver('contentObserver') | ||||
| 		} | ||||
| 	} | ||||
| </script> | ||||
|  | ||||
| <style lang="scss" scoped> | ||||
| 	.u-sticky { | ||||
| 		/* #ifdef APP-VUE || MP-WEIXIN */ | ||||
| 		// 此处默认写sticky属性,是为了给微信和APP通过uni.createSelectorQuery查询是否支持css sticky使用 | ||||
| 		position: sticky; | ||||
| 		/* #endif */ | ||||
| 	} | ||||
| </style> | ||||
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