268 lines
		
	
	
		
			8.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
		
		
			
		
	
	
			268 lines
		
	
	
		
			8.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
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								<template>
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									<view class="u-image" @tap="onClick" :style="[wrapStyle, backgroundStyle]">
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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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											:lazy-load="lazyLoad"
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											class="u-image__image"
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											:show-menu-by-longpress="showMenuByLongpress"
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											:style="{
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												borderRadius: shape == 'circle' ? '50%' : $u.addUnit(borderRadius)
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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%' : $u.addUnit(borderRadius),
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												backgroundColor: this.bgColor
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											}"
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										>
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											<slot v-if="$slots.loading" name="loading" />
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											<u-icon v-else :name="loadingIcon" :width="width" :height="height"></u-icon>
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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%' : $u.addUnit(borderRadius)
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											}"
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										>
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											<slot v-if="$slots.error" name="error" />
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											<u-icon v-else :name="errorIcon" :width="width" :height="height"></u-icon>
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										</view>
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									</view>
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								</template>
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								<script>
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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
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								 * @property {String | Number} width 宽度,单位任意,如果为数值,则为rpx单位(默认100%)
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								 * @property {String | Number} height 高度,单位任意,如果为数值,则为rpx单位(默认 auto)
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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} border-radius 圆角值,单位任意,如果为数值,则为rpx单位(默认 0)
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								 * @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)
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								 * @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)
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								 * @property {String} loading-icon 加载中的图标,或者小图片(默认 photo)
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								 * @property {String} error-icon 加载失败的图标,或者小图片(默认 error-circle)
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								 * @property {Boolean} show-loading 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} show-error 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 {String Number} width 传入图片路径时图片的宽度
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								 * @property {String Number} height 传入图片路径时图片的高度
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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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								 * @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="300rpx" :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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									props: {
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										// 图片地址
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										src: {
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											type: String,
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											default: ''
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										},
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										// 裁剪模式
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										mode: {
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											type: String,
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											default: 'aspectFill'
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										},
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										// 宽度,单位任意
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										width: {
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											type: [String, Number],
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											default: '100%'
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										},
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										// 高度,单位任意
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										height: {
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											type: [String, Number],
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											default: 'auto'
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										},
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										// 图片形状,circle-圆形,square-方形
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										shape: {
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											type: String,
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											default: 'square'
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										},
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										// 圆角,单位任意
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										borderRadius: {
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											type: [String, Number],
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											default: 0
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										},
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										// 是否懒加载,微信小程序、App、百度小程序、字节跳动小程序
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										lazyLoad: {
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											type: Boolean,
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											default: true
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										},
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										// 开启长按图片显示识别微信小程序码菜单
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										showMenuByLongpress: {
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											type: Boolean,
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											default: true
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										},
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										// 加载中的图标,或者小图片
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										loadingIcon: {
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											type: String,
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											default: 'photo'
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										},
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										// 加载失败的图标,或者小图片
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										errorIcon: {
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											type: String,
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											default: 'error-circle'
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										},
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										// 是否显示加载中的图标或者自定义的slot
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										showLoading: {
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											type: Boolean,
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											default: true
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										},
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										// 是否显示加载错误的图标或者自定义的slot
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										showError: {
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											type: Boolean,
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											default: true
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										},
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										// 是否需要淡入效果
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										fade: {
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											type: Boolean,
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											default: true
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										},
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										// 只支持网络资源,只对微信小程序有效
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										webp: {
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											type: Boolean,
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											default: false
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										},
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										// 过渡时间,单位ms
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										duration: {
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											type: [String, Number],
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											default: 500
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										},
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										// 背景颜色,用于深色页面加载图片时,为了和背景色融合
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										bgColor: {
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											type: String,
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											default: '#f3f4f6'
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										}
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									},
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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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										};
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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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													this.loading = false;
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												} else {
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													this.isError = false;
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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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											// 如果是配置了圆形,设置50%的圆角,否则按照默认的配置值
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											style.borderRadius = this.shape == 'circle' ? '50%' : this.$u.addUnit(this.borderRadius);
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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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												style.transition = `opacity ${Number(this.durationTime) / 1000}s ease-in-out`;
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											}
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											return style;
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										}
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									},
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									methods: {
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										// 点击图片
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										onClick() {
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											this.$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.$emit('error', err);
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										},
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										// 图片加载完成,标记loading结束
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										onLoadHandler() {
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											this.loading = false;
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											this.isError = false;
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											this.$emit('load');
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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();
							 | 
						|||
| 
								 | 
							
												}, 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>
							 |