<template>
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<uv-transition
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v-if="show"
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:show="show"
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mode="fade"
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:duration="fade ? duration : 0"
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:cell-child="cellChild"
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:custom-style="wrapStyle"
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>
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<view
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class="uv-image"
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:class="[`uv-image--${elIndex}`]"
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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 && observeShow"
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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="uv-image__image"
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:style="[imageStyle]"
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:webp="webp"
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></image>
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<view
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v-if="showLoading && loading"
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class="uv-image__loading"
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:style="{
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borderRadius: shape == 'circle' ? '50%' : $uv.addUnit(radius),
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backgroundColor: bgColor,
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width: $uv.addUnit(width),
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height: $uv.addUnit(height)
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}"
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>
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<slot name="loading">
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<uv-icon
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:name="loadingIcon"
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:width="width"
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:height="height"
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></uv-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="uv-image__error"
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:style="{
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borderRadius: shape == 'circle' ? '50%' : $uv.addUnit(radius),
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width: $uv.addUnit(width),
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height: $uv.addUnit(height)
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}"
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>
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<slot name="error">
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<uv-icon
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:name="errorIcon"
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:width="width"
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:height="height"
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></uv-icon>
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</slot>
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</view>
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</view>
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</uv-transition>
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</template>
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<script>
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import mpMixin from '@/uni_modules/uv-ui-tools/libs/mixin/mpMixin.js'
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import mixin from '@/uni_modules/uv-ui-tools/libs/mixin/mixin.js'
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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://www.uvui.cn/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 <uv-image width="100%" height="300px" :src="src"></uv-image>
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*/
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export default {
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name: 'uv-image',
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emits: ['click','load','error'],
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mixins: [mpMixin, 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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// 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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// 是否开启图片出现在可视范围进行加载(另一种懒加载)
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observeShow: !this.observeLazyLoad,
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elIndex: '',
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// 因为props的值无法修改,故需要一个中间值
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imgWidth: this.width,
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// 因为props的值无法修改,故需要一个中间值
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imgHeight: this.height,
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thresholdValue: 50
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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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} 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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width(newVal){
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// 这样做的目的是避免在更新时候,某些平台动画会恢复关闭状态
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this.show = false;
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this.$uv.sleep(2).then(res=>{
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this.show = true;
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});
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this.imgWidth = newVal;
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},
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height(newVal){
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// 这样做的目的是避免在更新时候,某些平台动画会恢复关闭状态
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this.show = false;
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this.$uv.sleep(2).then(res=>{
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this.show = true;
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});
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this.imgHeight = newVal;
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}
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},
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computed: {
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wrapStyle() {
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let style = {};
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// 通过调用addUnit()方法,如果有单位,如百分比,px单位等,直接返回,如果是纯粹的数值,则加上rpx单位
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if(this.mode !== 'heightFix') {
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style.width = this.$uv.addUnit(this.imgWidth);
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}
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if(this.mode !== 'widthFix') {
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style.height = this.$uv.addUnit(this.imgHeight);
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}
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// 如果是显示圆形,设置一个很多的半径值即可
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style.borderRadius = this.shape == 'circle' ? '10000px' : this.$uv.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.radius > 0 ? 'hidden' : 'visible'
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return this.$uv.deepMerge(style, this.$uv.addStyle(this.customStyle));
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},
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imageStyle() {
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let style = {};
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style.borderRadius = this.shape == 'circle' ? '10000px' : this.$uv.addUnit(this.radius);
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// #ifdef APP-NVUE
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style.width = this.$uv.addUnit(this.imgWidth);
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style.height = this.$uv.addUnit(this.imgHeight);
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// #endif
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return style;
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}
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},
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created() {
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this.elIndex = this.$uv.guid();
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this.observer = {}
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this.observerName = 'lazyLoadContentObserver'
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},
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mounted() {
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this.show = true;
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this.$nextTick(()=>{
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if(this.observeLazyLoad) this.observerFn();
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})
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},
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methods: {
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// 点击图片
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onClick() {
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this.$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.$emit('error', err)
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},
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// 图片加载完成,标记loading结束
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onLoadHandler(event) {
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if(this.mode == 'widthFix') this.imgHeight = 'auto'
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if(this.mode == 'heightFix') this.imgWidth = 'auto'
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this.loading = false
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this.isError = false
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this.$emit('load', event)
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this.removeBgColor()
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},
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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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// 观察图片是否在可见视口
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observerFn(){
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// 在需要用到懒加载的页面,在触发底部的时候触发tOnLazyLoadReachBottom事件,保证所有图片进行加载
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this.$nextTick(() => {
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uni.$once('onLazyLoadReachBottom', () => {
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if (!this.observeShow) this.observeShow = true
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})
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})
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setTimeout(() => {
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// #ifndef APP-NVUE
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this.disconnectObserver(this.observerName)
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const contentObserver = uni.createIntersectionObserver(this)
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contentObserver.relativeToViewport({
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bottom: this.thresholdValue
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}).observe(`.uv-image--${this.elIndex}`, (res) => {
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if (res.intersectionRatio > 0) {
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// 懒加载状态改变
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this.observeShow = true
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// 如果图片已经加载,去掉监听,减少性能消耗
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this.disconnectObserver(this.observerName)
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}
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})
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this[this.observerName] = contentObserver
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// #endif
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// #ifdef APP-NVUE
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this.observeShow = true;
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// #endif
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}, 50)
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},
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disconnectObserver(observerName) {
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const observer = this[observerName]
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observer && observer.disconnect()
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}
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}
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};
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</script>
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<style lang="scss" scoped>
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@import '@/uni_modules/uv-ui-tools/libs/css/components.scss';
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@import '@/uni_modules/uv-ui-tools/libs/css/color.scss';
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$uv-image-error-top:0px !default;
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$uv-image-error-left:0px !default;
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$uv-image-error-width:100% !default;
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$uv-image-error-hight:100% !default;
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$uv-image-error-background-color:$uv-bg-color !default;
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$uv-image-error-color:$uv-tips-color !default;
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$uv-image-error-font-size: 46rpx !default;
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.uv-image {
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position: relative;
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transition: opacity 0.5s ease-in-out;
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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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&__loading,
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&__error {
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position: absolute;
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top: $uv-image-error-top;
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left: $uv-image-error-left;
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width: $uv-image-error-width;
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height: $uv-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: $uv-image-error-background-color;
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color: $uv-image-error-color;
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font-size: $uv-image-error-font-size;
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}
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}
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</style>
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