233 lines
		
	
	
		
			8.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
			
		
		
	
	
			233 lines
		
	
	
		
			8.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
| <template>
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| 	<u-transition
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| 		mode="fade"
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| 		:show="show"
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| 		:duration="fade ? 1000 : 0"
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| 	>
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| 		<view
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| 			class="u-image"
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| 			@tap="onClick"
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| 			:style="[wrapStyle, backgroundStyle]"
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| 		>
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| 			<image
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| 				v-if="!isError"
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| 				:src="src"
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| 				:mode="mode"
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| 				@error="onErrorHandler"
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| 				@load="onLoadHandler"
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| 				:show-menu-by-longpress="showMenuByLongpress"
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| 				:lazy-load="lazyLoad"
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| 				class="u-image__image"
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| 				:style="{
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| 					borderRadius: shape == 'circle' ? '10000px' : $u.addUnit(radius),
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| 					width: $u.addUnit(width),
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| 					height: $u.addUnit(height)
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| 				}"
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| 			></image>
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| 			<view
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| 				v-if="showLoading && loading"
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| 				class="u-image__loading"
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| 				:style="{
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| 					borderRadius: shape == 'circle' ? '50%' : $u.addUnit(radius),
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| 					backgroundColor: this.bgColor,
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| 					width: $u.addUnit(width),
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| 					height: $u.addUnit(height)
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| 				}"
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| 			>
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| 				<slot name="loading">
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| 					<u-icon
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| 						:name="loadingIcon"
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| 						:width="width"
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| 						:height="height"
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| 					></u-icon>
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| 				</slot>
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| 			</view>
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| 			<view
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| 				v-if="showError && isError && !loading"
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| 				class="u-image__error"
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| 				:style="{
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| 					borderRadius: shape == 'circle' ? '50%' : $u.addUnit(radius),
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| 					width: $u.addUnit(width),
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| 					height: $u.addUnit(height)
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| 				}"
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| 			>
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| 				<slot name="error">
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| 					<u-icon
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| 						:name="errorIcon"
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| 						:width="width"
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| 						:height="height"
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| 					></u-icon>
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| 				</slot>
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| 			</view>
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| 		</view>
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| 	</u-transition>
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| </template>
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| 
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| <script>
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| 	import props from './props.js';
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| 	/**
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| 	 * Image 图片
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| 	 * @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。
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| 	 * @tutorial https://uviewui.com/components/image.html
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| 	 * @property {String}			src 				图片地址
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| 	 * @property {String}			mode 				裁剪模式,见官网说明 (默认 'aspectFill' )
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| 	 * @property {String | Number}	width 				宽度,单位任意,如果为数值,则为px单位 (默认 '300' )
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| 	 * @property {String | Number}	height 				高度,单位任意,如果为数值,则为px单位 (默认 '225' )
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| 	 * @property {String}			shape 				图片形状,circle-圆形,square-方形 (默认 'square' )
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| 	 * @property {String | Number}	radius		 		圆角值,单位任意,如果为数值,则为px单位 (默认 0 )
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| 	 * @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 )
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| 	 * @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 )
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| 	 * @property {String}			loadingIcon 		加载中的图标,或者小图片 (默认 'photo' )
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| 	 * @property {String}			errorIcon 			加载失败的图标,或者小图片 (默认 'error-circle' )
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| 	 * @property {Boolean}			showLoading 		是否显示加载中的图标或者自定义的slot (默认 true )
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| 	 * @property {Boolean}			showError 			是否显示加载错误的图标或者自定义的slot (默认 true )
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| 	 * @property {Boolean}			fade 				是否需要淡入效果 (默认 true )
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| 	 * @property {Boolean}			webp 				只支持网络资源,只对微信小程序有效 (默认 false )
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| 	 * @property {String | Number}	duration 			搭配fade参数的过渡时间,单位ms (默认 500 )
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| 	 * @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' )
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| 	 * @property {Object}			customStyle  		定义需要用到的外部样式
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| 	 * @event {Function}	click	点击图片时触发
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| 	 * @event {Function}	error	图片加载失败时触发
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| 	 * @event {Function} load 图片加载成功时触发
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| 	 * @example <u-image width="100%" height="300px" :src="src"></u-image>
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| 	 */
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| 	export default {
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| 		name: 'u-image',
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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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| 				// 图片是否加载错误,如果是,则显示错误占位图
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| 				isError: false,
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| 				// 初始化组件时,默认为加载中状态
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| 				loading: true,
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| 				// 不透明度,为了实现淡入淡出的效果
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| 				opacity: 1,
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| 				// 过渡时间,因为props的值无法修改,故需要一个中间值
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| 				durationTime: this.duration,
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| 				// 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
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| 				backgroundStyle: {},
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| 				// 用于fade模式的控制组件显示与否
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| 				show: false
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| 			};
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| 		},
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| 		watch: {
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| 			src: {
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| 				immediate: true,
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| 				handler(n) {
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| 					if (!n) {
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| 						// 如果传入null或者'',或者false,或者undefined,标记为错误状态
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| 						this.isError = true
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| 						
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| 					} else {
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| 						this.isError = false;
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| 						this.loading = true;
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| 					}
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| 				}
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| 			}
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| 		},
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| 		computed: {
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| 			wrapStyle() {
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| 				let style = {};
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| 				// 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
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| 				style.width = this.$u.addUnit(this.width);
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| 				style.height = this.$u.addUnit(this.height);
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| 				// 如果是显示圆形,设置一个很多的半径值即可
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| 				style.borderRadius = this.shape == 'circle' ? '10000px' : uni.$u.addUnit(this.radius)
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| 				// 如果设置圆角,必须要有hidden,否则可能圆角无效
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| 				style.overflow = this.borderRadius > 0 ? 'hidden' : 'visible'
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| 				// if (this.fade) {
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| 				// 	style.opacity = this.opacity
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| 				// 	// nvue下,这几个属性必须要分开写
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| 				// 	style.transitionDuration = `${this.durationTime}ms`
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| 				// 	style.transitionTimingFunction = 'ease-in-out'
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| 				// 	style.transitionProperty = 'opacity'
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| 				// }
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| 				return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle));
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| 
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| 			}
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| 		},
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| 		mounted() {
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| 			this.show = true
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| 		},
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| 		methods: {
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| 			// 点击图片
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| 			onClick() {
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| 				this.$emit('click')
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| 			},
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| 			// 图片加载失败
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| 			onErrorHandler(err) {
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| 				this.loading = false
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| 				this.isError = true
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| 				this.$emit('error', err)
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| 			},
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| 			// 图片加载完成,标记loading结束
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| 			onLoadHandler(event) {
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| 				this.loading = false
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| 				this.isError = false
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| 				this.$emit('load', event)
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| 				this.removeBgColor()
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| 				// 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
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| 				// 否则无需fade效果时,png图片依然能看到下方的背景色
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| 				// if (!this.fade) return this.removeBgColor();
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| 				// // 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
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| 				// this.opacity = 0;
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| 				// // 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)
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| 				// // 到图片展示的过程中的淡入效果
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| 				// this.durationTime = 0;
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| 				// // 延时50ms,否则在浏览器H5,过渡效果无效
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| 				// setTimeout(() => {
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| 				// 	this.durationTime = this.duration;
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| 				// 	this.opacity = 1;
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| 				// 	setTimeout(() => {
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| 				// 		this.removeBgColor();
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| 				// 	}, this.durationTime);
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| 				// }, 50);
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| 			},
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| 			// 移除图片的背景色
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| 			removeBgColor() {
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| 				// 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
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| 				this.backgroundStyle = {
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| 					backgroundColor: 'transparent'
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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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| 
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| <style lang="scss" scoped>
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| 	@import '../../libs/css/components.scss';
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| 
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| 	$u-image-error-top:0px !default;
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| 	$u-image-error-left:0px !default;
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| 	$u-image-error-width:100% !default;
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| 	$u-image-error-hight:100% !default;
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| 	$u-image-error-background-color:$u-bg-color !default;
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| 	$u-image-error-color:$u-tips-color !default;
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| 	$u-image-error-font-size: 46rpx !default;
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| 
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| 	.u-image {
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| 		position: relative;
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| 		transition: opacity 0.5s ease-in-out;
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| 
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| 		&__image {
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| 			width: 100%;
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| 			height: 100%;
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| 		}
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| 
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| 		&__loading,
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| 		&__error {
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| 			position: absolute;
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| 			top: $u-image-error-top;
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| 			left: $u-image-error-left;
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| 			width: $u-image-error-width;
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| 			height: $u-image-error-hight;
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| 			@include flex;
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| 			align-items: center;
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| 			justify-content: center;
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| 			background-color: $u-image-error-background-color;
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| 			color: $u-image-error-color;
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| 			font-size: $u-image-error-font-size;
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| 		}
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| 	}
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| </style>
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