245 lines
8.4 KiB
Vue
245 lines
8.4 KiB
Vue
|
|
<template>
|
|||
|
|
<view
|
|||
|
|
class="u-image"
|
|||
|
|
@tap="onClick"
|
|||
|
|
:style="$u.toStyle(wrapStyle, backgroundStyle, customStyle)"
|
|||
|
|
:class="customClass"
|
|||
|
|
>
|
|||
|
|
<image
|
|||
|
|
v-if="!isError"
|
|||
|
|
:src="src"
|
|||
|
|
:mode="mode"
|
|||
|
|
@error="onErrorHandler"
|
|||
|
|
@load="onLoadHandler"
|
|||
|
|
:lazy-load="lazyLoad"
|
|||
|
|
class="u-image__image"
|
|||
|
|
:show-menu-by-longpress="showMenuByLongpress"
|
|||
|
|
:style="{ borderRadius: shape === 'circle' ? '50%' : $u.addUnit(borderRadius) }"
|
|||
|
|
></image>
|
|||
|
|
<view
|
|||
|
|
v-if="showLoading && loading"
|
|||
|
|
class="u-image__loading"
|
|||
|
|
:style="{ borderRadius: shape === 'circle' ? '50%' : $u.addUnit(borderRadius), backgroundColor: bgColor }"
|
|||
|
|
>
|
|||
|
|
<slot v-if="hasSlot('loading')" name="loading" />
|
|||
|
|
<u-icon v-else :name="loadingIcon" :width="width" :height="height"></u-icon>
|
|||
|
|
</view>
|
|||
|
|
<view
|
|||
|
|
v-if="showError && isError && !loading"
|
|||
|
|
class="u-image__error"
|
|||
|
|
:style="{ borderRadius: shape === 'circle' ? '50%' : $u.addUnit(borderRadius) }"
|
|||
|
|
>
|
|||
|
|
<slot v-if="hasSlot('error')" name="error" />
|
|||
|
|
<u-icon v-else :name="errorIcon" :width="width" :height="height"></u-icon>
|
|||
|
|
</view>
|
|||
|
|
</view>
|
|||
|
|
</template>
|
|||
|
|
|
|||
|
|
<script lang="ts">
|
|||
|
|
export default {
|
|||
|
|
name: 'u-image',
|
|||
|
|
options: {
|
|||
|
|
addGlobalClass: true,
|
|||
|
|
// #ifndef MP-TOUTIAO
|
|||
|
|
virtualHost: true,
|
|||
|
|
// #endif
|
|||
|
|
styleIsolation: 'shared'
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
<script setup lang="ts">
|
|||
|
|
import { ref, computed, watch, useSlots } from 'vue';
|
|||
|
|
import { type ImageExpose, ImageProps } from './types';
|
|||
|
|
import { $u } from '../..';
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 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://uviewpro.cn/zh/components/image.html
|
|||
|
|
* @property {String} src 图片地址
|
|||
|
|
* @property {String} mode 裁剪模式,见官网说明
|
|||
|
|
* @property {String | Number} width 宽度,单位任意,如果为数值,则为rpx单位(默认100%)
|
|||
|
|
* @property {String | Number} height 高度,单位任意,如果为数值,则为rpx单位(默认 auto)
|
|||
|
|
* @property {String} shape 图片形状,circle-圆形,square-方形(默认square)
|
|||
|
|
* @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)
|
|||
|
|
* @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)
|
|||
|
|
* @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)
|
|||
|
|
* @property {String} loading-icon 加载中的图标,或者小图片(默认 photo)
|
|||
|
|
* @property {String} error-icon 加载失败的图标,或者小图片(默认 error-circle)
|
|||
|
|
* @property {Boolean} show-loading 是否显示加载中的图标或者自定义的slot(默认 true)
|
|||
|
|
* @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)
|
|||
|
|
* @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} bg-color 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 var(--u-bg-color))
|
|||
|
|
* @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="300rpx" :src="src"></u-image>
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
const emit = defineEmits<{
|
|||
|
|
(e: 'click'): void;
|
|||
|
|
(e: 'error', err: any): void;
|
|||
|
|
(e: 'load'): void;
|
|||
|
|
}>();
|
|||
|
|
|
|||
|
|
const props = defineProps(ImageProps);
|
|||
|
|
|
|||
|
|
// 图片是否加载错误,如果是,则显示错误占位图
|
|||
|
|
const isError = ref(false);
|
|||
|
|
// 初始化组件时,默认为加载中状态
|
|||
|
|
const loading = ref(true);
|
|||
|
|
// 不透明度,为了实现淡入淡出的效果
|
|||
|
|
const opacity = ref(1);
|
|||
|
|
// 过渡时间,因为props的值无法修改,故需要一个中间值
|
|||
|
|
const durationTime = ref(props.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
|
|||
|
|
const backgroundStyle = ref<Record<string, any>>({});
|
|||
|
|
|
|||
|
|
// 监听src变化,处理加载状态
|
|||
|
|
watch(
|
|||
|
|
() => props.src,
|
|||
|
|
n => {
|
|||
|
|
if (!n) {
|
|||
|
|
// 如果传入null或者'',或者false,或者undefined,标记为错误状态
|
|||
|
|
isError.value = true;
|
|||
|
|
loading.value = false;
|
|||
|
|
} else {
|
|||
|
|
isError.value = false;
|
|||
|
|
loading.value = true;
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
{ immediate: true }
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 计算图片外层包裹样式
|
|||
|
|
* @returns {Record<string, any>}
|
|||
|
|
*/
|
|||
|
|
const wrapStyle = computed(() => {
|
|||
|
|
let style: Record<string, any> = {};
|
|||
|
|
// 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 = $u.addUnit(props.width);
|
|||
|
|
style.height = $u.addUnit(props.height);
|
|||
|
|
// 如果是配置了圆形,设置50%的圆角,否则按照默认的配置值
|
|||
|
|
style.borderRadius = props.shape === 'circle' ? '50%' : $u.addUnit(props.borderRadius);
|
|||
|
|
// 如果设置圆角,必须要有hidden,否则可能圆角无效
|
|||
|
|
style.overflow = Number(props.borderRadius) > 0 ? 'hidden' : 'visible';
|
|||
|
|
if (props.fade) {
|
|||
|
|
style.opacity = opacity.value;
|
|||
|
|
style.transition = `opacity ${Number(durationTime.value) / 1000}s ease-in-out`;
|
|||
|
|
}
|
|||
|
|
return style;
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 点击图片
|
|||
|
|
* @emits click
|
|||
|
|
*/
|
|||
|
|
function onClick() {
|
|||
|
|
emit('click');
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 图片加载失败
|
|||
|
|
* @param err 失败事件对象
|
|||
|
|
* @emits error
|
|||
|
|
*/
|
|||
|
|
function onErrorHandler(err: any) {
|
|||
|
|
loading.value = false;
|
|||
|
|
isError.value = true;
|
|||
|
|
emit('error', err);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 图片加载完成,标记loading结束
|
|||
|
|
* @emits load
|
|||
|
|
*/
|
|||
|
|
function onLoadHandler() {
|
|||
|
|
loading.value = false;
|
|||
|
|
isError.value = false;
|
|||
|
|
emit('load');
|
|||
|
|
// 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 (!props.fade) return 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
|
|||
|
|
opacity.value = 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
|
|||
|
|
durationTime.value = 0;
|
|||
|
|
// 延时50ms,否则在浏览器H5,过渡效果无效
|
|||
|
|
setTimeout(() => {
|
|||
|
|
durationTime.value = props.duration;
|
|||
|
|
opacity.value = 1;
|
|||
|
|
setTimeout(() => {
|
|||
|
|
removeBgColor();
|
|||
|
|
}, Number(durationTime.value));
|
|||
|
|
}, 50);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 移除图片的背景色
|
|||
|
|
* 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
|
|||
|
|
*/
|
|||
|
|
function removeBgColor() {
|
|||
|
|
backgroundStyle.value = {
|
|||
|
|
backgroundColor: 'transparent'
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function changeStatus(status: 'loading' | 'error' | 'normal') {
|
|||
|
|
if (status === 'loading') {
|
|||
|
|
loading.value = true;
|
|||
|
|
isError.value = false;
|
|||
|
|
} else if (status === 'error') {
|
|||
|
|
loading.value = false;
|
|||
|
|
isError.value = true;
|
|||
|
|
} else {
|
|||
|
|
loading.value = false;
|
|||
|
|
isError.value = false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 暴露给模板
|
|||
|
|
const $slots = useSlots();
|
|||
|
|
|
|||
|
|
function hasSlot(name: string) {
|
|||
|
|
return props.useSlots ? !!$slots[name] && props.useSlots[name] : !!$slots[name];
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
defineExpose<ImageExpose>({
|
|||
|
|
changeStatus
|
|||
|
|
});
|
|||
|
|
</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>
|