268 lines
		
	
	
		
			8.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
		
		
			
		
	
	
			268 lines
		
	
	
		
			8.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
|  | <template> | |||
|  | 	<view class="u-image" @tap="onClick" :style="[wrapStyle, backgroundStyle]"> | |||
|  | 		<image | |||
|  | 			v-if="!isError" | |||
|  | 			:src="src" | |||
|  | 			:mode="mode" | |||
|  | 			@error="onErrorHandler" | |||
|  | 			@load="onLoadHandler" | |||
|  | 			:lazy-load="lazyLoad" | |||
|  | 			class="u-image__image" | |||
|  | 			:show-menu-by-longpress="showMenuByLongpress" | |||
|  | 			:style="{ | |||
|  | 				borderRadius: shape == 'circle' ? '50%' : $u.addUnit(borderRadius) | |||
|  | 			}" | |||
|  | 		></image> | |||
|  | 		<view | |||
|  | 			v-if="showLoading && loading" | |||
|  | 			class="u-image__loading" | |||
|  | 			:style="{ | |||
|  | 				borderRadius: shape == 'circle' ? '50%' : $u.addUnit(borderRadius), | |||
|  | 				backgroundColor: this.bgColor | |||
|  | 			}" | |||
|  | 		> | |||
|  | 			<slot v-if="$slots.loading" name="loading" /> | |||
|  | 			<u-icon v-else :name="loadingIcon" :width="width" :height="height"></u-icon> | |||
|  | 		</view> | |||
|  | 		<view | |||
|  | 			v-if="showError && isError && !loading" | |||
|  | 			class="u-image__error" | |||
|  | 			:style="{ | |||
|  | 				borderRadius: shape == 'circle' ? '50%' : $u.addUnit(borderRadius) | |||
|  | 			}" | |||
|  | 		> | |||
|  | 			<slot v-if="$slots.error" name="error" /> | |||
|  | 			<u-icon v-else :name="errorIcon" :width="width" :height="height"></u-icon> | |||
|  | 		</view> | |||
|  | 	</view> | |||
|  | </template> | |||
|  | 
 | |||
|  | <script> | |||
|  | /** | |||
|  |  * Image 图片 | |||
|  |  * @description 此组件为uni-app的image组件的加强版,在继承了原有功能外,还支持淡入动画、加载中、加载失败提示、圆角值和形状等。 | |||
|  |  * @tutorial https://uviewui.com/components/image.html
 | |||
|  |  * @property {String} src 图片地址 | |||
|  |  * @property {String} mode 裁剪模式,见官网说明 | |||
|  |  * @property {String | Number} width 宽度,单位任意,如果为数值,则为rpx单位(默认100%) | |||
|  |  * @property {String | Number} height 高度,单位任意,如果为数值,则为rpx单位(默认 auto) | |||
|  |  * @property {String} shape 图片形状,circle-圆形,square-方形(默认square) | |||
|  |  * @property {String | Number} border-radius 圆角值,单位任意,如果为数值,则为rpx单位(默认 0) | |||
|  |  * @property {Boolean} lazy-load 是否懒加载,仅微信小程序、App、百度小程序、字节跳动小程序有效(默认 true) | |||
|  |  * @property {Boolean} show-menu-by-longpress 是否开启长按图片显示识别小程序码菜单,仅微信小程序有效(默认 false) | |||
|  |  * @property {String} loading-icon 加载中的图标,或者小图片(默认 photo) | |||
|  |  * @property {String} error-icon 加载失败的图标,或者小图片(默认 error-circle) | |||
|  |  * @property {Boolean} show-loading 是否显示加载中的图标或者自定义的slot(默认 true) | |||
|  |  * @property {Boolean} show-error 是否显示加载错误的图标或者自定义的slot(默认 true) | |||
|  |  * @property {Boolean} fade 是否需要淡入效果(默认 true) | |||
|  |  * @property {String Number} width 传入图片路径时图片的宽度 | |||
|  |  * @property {String Number} height 传入图片路径时图片的高度 | |||
|  |  * @property {Boolean} webp 只支持网络资源,只对微信小程序有效(默认 false) | |||
|  |  * @property {String | Number} duration 搭配fade参数的过渡时间,单位ms(默认 500) | |||
|  |  * @event {Function} click 点击图片时触发 | |||
|  |  * @event {Function} error 图片加载失败时触发 | |||
|  |  * @event {Function} load 图片加载成功时触发 | |||
|  |  * @example <u-image width="100%" height="300rpx" :src="src"></u-image> | |||
|  |  */ | |||
|  | export default { | |||
|  | 	name: 'u-image', | |||
|  | 	props: { | |||
|  | 		// 图片地址
 | |||
|  | 		src: { | |||
|  | 			type: String, | |||
|  | 			default: '' | |||
|  | 		}, | |||
|  | 		// 裁剪模式
 | |||
|  | 		mode: { | |||
|  | 			type: String, | |||
|  | 			default: 'aspectFill' | |||
|  | 		}, | |||
|  | 		// 宽度,单位任意
 | |||
|  | 		width: { | |||
|  | 			type: [String, Number], | |||
|  | 			default: '100%' | |||
|  | 		}, | |||
|  | 		// 高度,单位任意
 | |||
|  | 		height: { | |||
|  | 			type: [String, Number], | |||
|  | 			default: 'auto' | |||
|  | 		}, | |||
|  | 		// 图片形状,circle-圆形,square-方形
 | |||
|  | 		shape: { | |||
|  | 			type: String, | |||
|  | 			default: 'square' | |||
|  | 		}, | |||
|  | 		// 圆角,单位任意
 | |||
|  | 		borderRadius: { | |||
|  | 			type: [String, Number], | |||
|  | 			default: 0 | |||
|  | 		}, | |||
|  | 		// 是否懒加载,微信小程序、App、百度小程序、字节跳动小程序
 | |||
|  | 		lazyLoad: { | |||
|  | 			type: Boolean, | |||
|  | 			default: true | |||
|  | 		}, | |||
|  | 		// 开启长按图片显示识别微信小程序码菜单
 | |||
|  | 		showMenuByLongpress: { | |||
|  | 			type: Boolean, | |||
|  | 			default: true | |||
|  | 		}, | |||
|  | 		// 加载中的图标,或者小图片
 | |||
|  | 		loadingIcon: { | |||
|  | 			type: String, | |||
|  | 			default: 'photo' | |||
|  | 		}, | |||
|  | 		// 加载失败的图标,或者小图片
 | |||
|  | 		errorIcon: { | |||
|  | 			type: String, | |||
|  | 			default: 'error-circle' | |||
|  | 		}, | |||
|  | 		// 是否显示加载中的图标或者自定义的slot
 | |||
|  | 		showLoading: { | |||
|  | 			type: Boolean, | |||
|  | 			default: true | |||
|  | 		}, | |||
|  | 		// 是否显示加载错误的图标或者自定义的slot
 | |||
|  | 		showError: { | |||
|  | 			type: Boolean, | |||
|  | 			default: true | |||
|  | 		}, | |||
|  | 		// 是否需要淡入效果
 | |||
|  | 		fade: { | |||
|  | 			type: Boolean, | |||
|  | 			default: true | |||
|  | 		}, | |||
|  | 		// 只支持网络资源,只对微信小程序有效
 | |||
|  | 		webp: { | |||
|  | 			type: Boolean, | |||
|  | 			default: false | |||
|  | 		}, | |||
|  | 		// 过渡时间,单位ms
 | |||
|  | 		duration: { | |||
|  | 			type: [String, Number], | |||
|  | 			default: 500 | |||
|  | 		}, | |||
|  | 		// 背景颜色,用于深色页面加载图片时,为了和背景色融合
 | |||
|  | 		bgColor: { | |||
|  | 			type: String, | |||
|  | 			default: '#f3f4f6' | |||
|  | 		} | |||
|  | 	}, | |||
|  | 	data() { | |||
|  | 		return { | |||
|  | 			// 图片是否加载错误,如果是,则显示错误占位图
 | |||
|  | 			isError: false, | |||
|  | 			// 初始化组件时,默认为加载中状态
 | |||
|  | 			loading: true, | |||
|  | 			// 不透明度,为了实现淡入淡出的效果
 | |||
|  | 			opacity: 1, | |||
|  | 			// 过渡时间,因为props的值无法修改,故需要一个中间值
 | |||
|  | 			durationTime: this.duration, | |||
|  | 			// 图片加载完成时,去掉背景颜色,因为如果是png图片,就会显示灰色的背景
 | |||
|  | 			backgroundStyle: {} | |||
|  | 		}; | |||
|  | 	}, | |||
|  | 	watch: { | |||
|  | 		src: { | |||
|  | 			immediate: true, | |||
|  | 			handler (n) { | |||
|  | 				if(!n) { | |||
|  | 					// 如果传入null或者'',或者false,或者undefined,标记为错误状态
 | |||
|  | 					this.isError = true; | |||
|  | 					this.loading = false; | |||
|  | 				} else { | |||
|  | 					this.isError = false; | |||
|  | 				} | |||
|  | 			} | |||
|  | 		} | |||
|  | 	}, | |||
|  | 	computed: { | |||
|  | 		wrapStyle() { | |||
|  | 			let style = {}; | |||
|  | 			// 通过调用addUnit()方法,如果有单位,如百分比,px单位等,直接返回,如果是纯粹的数值,则加上rpx单位
 | |||
|  | 			style.width = this.$u.addUnit(this.width); | |||
|  | 			style.height = this.$u.addUnit(this.height); | |||
|  | 			// 如果是配置了圆形,设置50%的圆角,否则按照默认的配置值
 | |||
|  | 			style.borderRadius = this.shape == 'circle' ? '50%' : this.$u.addUnit(this.borderRadius); | |||
|  | 			// 如果设置圆角,必须要有hidden,否则可能圆角无效
 | |||
|  | 			style.overflow = this.borderRadius > 0 ? 'hidden' : 'visible'; | |||
|  | 			if (this.fade) { | |||
|  | 				style.opacity = this.opacity; | |||
|  | 				style.transition = `opacity ${Number(this.durationTime) / 1000}s ease-in-out`; | |||
|  | 			} | |||
|  | 			return style; | |||
|  | 		} | |||
|  | 	}, | |||
|  | 	methods: { | |||
|  | 		// 点击图片
 | |||
|  | 		onClick() { | |||
|  | 			this.$emit('click'); | |||
|  | 		}, | |||
|  | 		// 图片加载失败
 | |||
|  | 		onErrorHandler(err) { | |||
|  | 			this.loading = false; | |||
|  | 			this.isError = true; | |||
|  | 			this.$emit('error', err); | |||
|  | 		}, | |||
|  | 		// 图片加载完成,标记loading结束
 | |||
|  | 		onLoadHandler() { | |||
|  | 			this.loading = false; | |||
|  | 			this.isError = false; | |||
|  | 			this.$emit('load'); | |||
|  | 			// 如果不需要动画效果,就不执行下方代码,同时移除加载时的背景颜色
 | |||
|  | 			// 否则无需fade效果时,png图片依然能看到下方的背景色
 | |||
|  | 			if (!this.fade) return this.removeBgColor(); | |||
|  | 			// 原来opacity为1(不透明,是为了显示占位图),改成0(透明,意味着该元素显示的是背景颜色,默认的灰色),再改成1,是为了获得过渡效果
 | |||
|  | 			this.opacity = 0; | |||
|  | 			// 这里设置为0,是为了图片展示到背景全透明这个过程时间为0,延时之后延时之后重新设置为duration,是为了获得背景透明(灰色)
 | |||
|  | 			// 到图片展示的过程中的淡入效果
 | |||
|  | 			this.durationTime = 0; | |||
|  | 			// 延时50ms,否则在浏览器H5,过渡效果无效
 | |||
|  | 			setTimeout(() => { | |||
|  | 				this.durationTime = this.duration; | |||
|  | 				this.opacity = 1; | |||
|  | 				setTimeout(() => { | |||
|  | 					this.removeBgColor(); | |||
|  | 				}, this.durationTime); | |||
|  | 			}, 50); | |||
|  | 		}, | |||
|  | 		// 移除图片的背景色
 | |||
|  | 		removeBgColor() { | |||
|  | 			// 淡入动画过渡完成后,将背景设置为透明色,否则png图片会看到灰色的背景
 | |||
|  | 			this.backgroundStyle = { | |||
|  | 				backgroundColor: 'transparent' | |||
|  | 			}; | |||
|  | 		} | |||
|  | 	} | |||
|  | }; | |||
|  | </script> | |||
|  | 
 | |||
|  | <style scoped lang="scss"> | |||
|  | @import '../../libs/css/style.components.scss'; | |||
|  | 
 | |||
|  | .u-image { | |||
|  | 	position: relative; | |||
|  | 	transition: opacity 0.5s ease-in-out; | |||
|  | 
 | |||
|  | 	&__image { | |||
|  | 		width: 100%; | |||
|  | 		height: 100%; | |||
|  | 	} | |||
|  | 
 | |||
|  | 	&__loading, | |||
|  | 	&__error { | |||
|  | 		position: absolute; | |||
|  | 		top: 0; | |||
|  | 		left: 0; | |||
|  | 		width: 100%; | |||
|  | 		height: 100%; | |||
|  | 		@include vue-flex; | |||
|  | 		align-items: center; | |||
|  | 		justify-content: center; | |||
|  | 		background-color: $u-bg-color; | |||
|  | 		color: $u-tips-color; | |||
|  | 		font-size: 46rpx; | |||
|  | 	} | |||
|  | } | |||
|  | </style> |