233 lines
		
	
	
		
			8.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
		
		
			
		
	
	
			233 lines
		
	
	
		
			8.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
|  | <template> | |||
|  | 	<u-transition | |||
|  | 		mode="fade" | |||
|  | 		:show="show" | |||
|  | 		:duration="fade ? 1000 : 0" | |||
|  | 	> | |||
|  | 		<view | |||
|  | 			class="u-image" | |||
|  | 			@tap="onClick" | |||
|  | 			:style="[wrapStyle, backgroundStyle]" | |||
|  | 		> | |||
|  | 			<image | |||
|  | 				v-if="!isError" | |||
|  | 				:src="src" | |||
|  | 				:mode="mode" | |||
|  | 				@error="onErrorHandler" | |||
|  | 				@load="onLoadHandler" | |||
|  | 				:show-menu-by-longpress="showMenuByLongpress" | |||
|  | 				:lazy-load="lazyLoad" | |||
|  | 				class="u-image__image" | |||
|  | 				:style="{ | |||
|  | 					borderRadius: shape == 'circle' ? '10000px' : $u.addUnit(radius), | |||
|  | 					width: $u.addUnit(width), | |||
|  | 					height: $u.addUnit(height) | |||
|  | 				}" | |||
|  | 			></image> | |||
|  | 			<view | |||
|  | 				v-if="showLoading && loading" | |||
|  | 				class="u-image__loading" | |||
|  | 				:style="{ | |||
|  | 					borderRadius: shape == 'circle' ? '50%' : $u.addUnit(radius), | |||
|  | 					backgroundColor: this.bgColor, | |||
|  | 					width: $u.addUnit(width), | |||
|  | 					height: $u.addUnit(height) | |||
|  | 				}" | |||
|  | 			> | |||
|  | 				<slot name="loading"> | |||
|  | 					<u-icon | |||
|  | 						:name="loadingIcon" | |||
|  | 						:width="width" | |||
|  | 						:height="height" | |||
|  | 					></u-icon> | |||
|  | 				</slot> | |||
|  | 			</view> | |||
|  | 			<view | |||
|  | 				v-if="showError && isError && !loading" | |||
|  | 				class="u-image__error" | |||
|  | 				:style="{ | |||
|  | 					borderRadius: shape == 'circle' ? '50%' : $u.addUnit(radius), | |||
|  | 					width: $u.addUnit(width), | |||
|  | 					height: $u.addUnit(height) | |||
|  | 				}" | |||
|  | 			> | |||
|  | 				<slot name="error"> | |||
|  | 					<u-icon | |||
|  | 						:name="errorIcon" | |||
|  | 						:width="width" | |||
|  | 						:height="height" | |||
|  | 					></u-icon> | |||
|  | 				</slot> | |||
|  | 			</view> | |||
|  | 		</view> | |||
|  | 	</u-transition> | |||
|  | </template> | |||
|  | 
 | |||
|  | <script> | |||
|  | 	import props from './props.js'; | |||
|  | 	/** | |||
|  | 	 * 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 (默认 'aspectFill' ) | |||
|  | 	 * @property {String | Number}	width 				宽度,单位任意,如果为数值,则为px单位 (默认 '300' ) | |||
|  | 	 * @property {String | Number}	height 				高度,单位任意,如果为数值,则为px单位 (默认 '225' ) | |||
|  | 	 * @property {String}			shape 				图片形状,circle-圆形,square-方形 (默认 'square' ) | |||
|  | 	 * @property {String | Number}	radius		 		圆角值,单位任意,如果为数值,则为px单位 (默认 0 ) | |||
|  | 	 * @property {Boolean}			lazyLoad			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}			showMenuByLongpress	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 true ) | |||
|  | 	 * @property {String}			loadingIcon 		加载中的图标,或者小图片 (默认 'photo' ) | |||
|  | 	 * @property {String}			errorIcon 			加载失败的图标,或者小图片 (默认 'error-circle' ) | |||
|  | 	 * @property {Boolean}			showLoading 		是否显示加载中的图标或者自定义的slot (默认 true ) | |||
|  | 	 * @property {Boolean}			showError 			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 {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 ) | |||
|  | 	 * @property {String}			bgColor 			背景颜色,用于深色页面加载图片时,为了和背景色融合  (默认 '#f3f4f6' ) | |||
|  | 	 * @property {Object}			customStyle  		定义需要用到的外部样式 | |||
|  | 	 * @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="300px" :src="src"></u-image> | |||
|  | 	 */ | |||
|  | 	export default { | |||
|  | 		name: 'u-image', | |||
|  | 		mixins: [uni.$u.mpMixin, uni.$u.mixin, props], | |||
|  | 		data() { | |||
|  | 			return { | |||
|  | 				// 图片是否加载错误,如果是,则显示错误占位图
 | |||
|  | 				isError: false, | |||
|  | 				// 初始化组件时,默认为加载中状态
 | |||
|  | 				loading: true, | |||
|  | 				// 不透明度,为了实现淡入淡出的效果
 | |||
|  | 				opacity: 1, | |||
|  | 				// 过渡时间,因为props的值无法修改,故需要一个中间值
 | |||
|  | 				durationTime: this.duration, | |||
|  | 				// 图片加载完成时,去掉背景颜色,因为如果是png图片,就会显示灰色的背景
 | |||
|  | 				backgroundStyle: {}, | |||
|  | 				// 用于fade模式的控制组件显示与否
 | |||
|  | 				show: false | |||
|  | 			}; | |||
|  | 		}, | |||
|  | 		watch: { | |||
|  | 			src: { | |||
|  | 				immediate: true, | |||
|  | 				handler(n) { | |||
|  | 					if (!n) { | |||
|  | 						// 如果传入null或者'',或者false,或者undefined,标记为错误状态
 | |||
|  | 						this.isError = true | |||
|  | 						 | |||
|  | 					} else { | |||
|  | 						this.isError = false; | |||
|  | 						this.loading = true; | |||
|  | 					} | |||
|  | 				} | |||
|  | 			} | |||
|  | 		}, | |||
|  | 		computed: { | |||
|  | 			wrapStyle() { | |||
|  | 				let style = {}; | |||
|  | 				// 通过调用addUnit()方法,如果有单位,如百分比,px单位等,直接返回,如果是纯粹的数值,则加上rpx单位
 | |||
|  | 				style.width = this.$u.addUnit(this.width); | |||
|  | 				style.height = this.$u.addUnit(this.height); | |||
|  | 				// 如果是显示圆形,设置一个很多的半径值即可
 | |||
|  | 				style.borderRadius = this.shape == 'circle' ? '10000px' : uni.$u.addUnit(this.radius) | |||
|  | 				// 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
 | |||
|  | 				// 	// nvue下,这几个属性必须要分开写
 | |||
|  | 				// 	style.transitionDuration = `${this.durationTime}ms`
 | |||
|  | 				// 	style.transitionTimingFunction = 'ease-in-out'
 | |||
|  | 				// 	style.transitionProperty = 'opacity'
 | |||
|  | 				// }
 | |||
|  | 				return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle)); | |||
|  | 
 | |||
|  | 			} | |||
|  | 		}, | |||
|  | 		mounted() { | |||
|  | 			this.show = true | |||
|  | 		}, | |||
|  | 		methods: { | |||
|  | 			// 点击图片
 | |||
|  | 			onClick() { | |||
|  | 				this.$emit('click') | |||
|  | 			}, | |||
|  | 			// 图片加载失败
 | |||
|  | 			onErrorHandler(err) { | |||
|  | 				this.loading = false | |||
|  | 				this.isError = true | |||
|  | 				this.$emit('error', err) | |||
|  | 			}, | |||
|  | 			// 图片加载完成,标记loading结束
 | |||
|  | 			onLoadHandler(event) { | |||
|  | 				this.loading = false | |||
|  | 				this.isError = false | |||
|  | 				this.$emit('load', event) | |||
|  | 				this.removeBgColor() | |||
|  | 				// 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 lang="scss" scoped> | |||
|  | 	@import '../../libs/css/components.scss'; | |||
|  | 
 | |||
|  | 	$u-image-error-top:0px !default; | |||
|  | 	$u-image-error-left:0px !default; | |||
|  | 	$u-image-error-width:100% !default; | |||
|  | 	$u-image-error-hight:100% !default; | |||
|  | 	$u-image-error-background-color:$u-bg-color !default; | |||
|  | 	$u-image-error-color:$u-tips-color !default; | |||
|  | 	$u-image-error-font-size: 46rpx !default; | |||
|  | 
 | |||
|  | 	.u-image { | |||
|  | 		position: relative; | |||
|  | 		transition: opacity 0.5s ease-in-out; | |||
|  | 
 | |||
|  | 		&__image { | |||
|  | 			width: 100%; | |||
|  | 			height: 100%; | |||
|  | 		} | |||
|  | 
 | |||
|  | 		&__loading, | |||
|  | 		&__error { | |||
|  | 			position: absolute; | |||
|  | 			top: $u-image-error-top; | |||
|  | 			left: $u-image-error-left; | |||
|  | 			width: $u-image-error-width; | |||
|  | 			height: $u-image-error-hight; | |||
|  | 			@include flex; | |||
|  | 			align-items: center; | |||
|  | 			justify-content: center; | |||
|  | 			background-color: $u-image-error-background-color; | |||
|  | 			color: $u-image-error-color; | |||
|  | 			font-size: $u-image-error-font-size; | |||
|  | 		} | |||
|  | 	} | |||
|  | </style> |