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<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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<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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} 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.$u.addStyle(this.customStyle));
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}
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},
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mounted() {
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this.show = true
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},
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methods: {
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// 点击图片
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onClick() {
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this.$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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<style lang="scss" scoped>
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@import '../../libs/css/components.scss';
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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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.u-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: $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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