mirror of
https://github.com/woodchen-ink/CoverView.git
synced 2025-07-18 05:51:56 +08:00
feat: 优化图片下载逻辑,增加加载状态和错误处理,确保元素可见性
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@ -1,4 +1,4 @@
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import React, { useContext, useState } from "react";
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import React, { useContext, useState, useRef } from "react";
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// import { exportComponentAsPNG } from "react-component-export-image";
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import "./CoverImage.css";
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import { ImgContext } from "../utils/ImgContext";
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@ -10,7 +10,7 @@ const ComponentToImg = (props) => {
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const [loading, setLoading] = useState(false)
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const { unsplashImage } = useContext(ImgContext);
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const componentRef = React.createRef();
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const componentRef = useRef(null);
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async function saveImage(data) {
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try {
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@ -32,39 +32,93 @@ const ComponentToImg = (props) => {
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try {
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setLoading(true);
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// 等待一小段时间确保组件完全渲染
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await new Promise(resolve => setTimeout(resolve, 100));
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const element = componentRef.current;
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if (!element) {
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throw new Error('无法找到要下载的元素');
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throw new Error('无法找到要下载的元素,请稍后重试');
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}
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// 检查元素是否在DOM中且可见
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if (!document.body.contains(element)) {
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throw new Error('元素不在DOM中');
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}
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if (element.offsetWidth === 0 || element.offsetHeight === 0) {
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throw new Error('元素尺寸为0,请等待页面完全加载');
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}
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// 等待所有图片加载完成
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const images = element.querySelectorAll('img');
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await Promise.all(Array.from(images).map(img => {
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if (img.complete) return Promise.resolve();
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return new Promise((resolve, reject) => {
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img.onload = resolve;
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img.onerror = () => {
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console.warn('图片加载失败:', img.src);
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resolve(); // 即使图片加载失败也继续
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console.log(`等待 ${images.length} 张图片加载完成...`);
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await Promise.all(Array.from(images).map((img, index) => {
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if (img.complete && img.naturalWidth > 0) {
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console.log(`图片 ${index + 1} 已加载`);
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return Promise.resolve();
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}
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return new Promise((resolve) => {
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const timeout = setTimeout(() => {
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console.warn(`图片 ${index + 1} 加载超时:`, img.src);
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resolve();
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}, 8000);
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img.onload = () => {
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console.log(`图片 ${index + 1} 加载完成`);
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clearTimeout(timeout);
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resolve();
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};
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// 设置超时
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setTimeout(resolve, 5000);
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img.onerror = () => {
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console.warn(`图片 ${index + 1} 加载失败:`, img.src);
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clearTimeout(timeout);
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resolve();
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};
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// 如果图片已经加载但事件没触发
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if (img.complete) {
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clearTimeout(timeout);
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resolve();
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}
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});
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}));
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// 简化配置,只使用基本选项
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const data = await domtoimage.toPng(componentRef.current, {
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console.log('所有图片处理完成,开始生成PNG...');
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// 再次确认元素状态
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if (!componentRef.current) {
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throw new Error('DOM元素在处理过程中丢失');
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}
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// 使用更保守的配置
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const options = {
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height: element.offsetHeight * 2,
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width: element.offsetWidth * 2,
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style: {
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transform: "scale(" + 2 + ")",
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transform: "scale(2)",
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transformOrigin: "top left",
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width: element.offsetWidth + "px",
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height: element.offsetHeight + "px",
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},
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// 添加过滤器,跳过可能有问题的节点
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filter: (node) => {
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// 跳过脚本标签和样式标签
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if (node.tagName === 'SCRIPT' || node.tagName === 'STYLE') {
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return false;
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}
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});
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// 跳过隐藏元素
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if (node.style && node.style.display === 'none') {
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return false;
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}
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return true;
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}
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};
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const data = await domtoimage.toPng(componentRef.current, options);
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console.log('PNG生成成功');
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await saveImage(data);
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// 跟踪 Unsplash 下载
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@ -75,7 +129,6 @@ const ComponentToImg = (props) => {
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});
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} catch (trackError) {
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console.warn('跟踪下载失败:', trackError);
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// 不影响主要功能,只是记录警告
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}
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}
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@ -83,14 +136,20 @@ const ComponentToImg = (props) => {
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console.error('下载图片时出错:', error);
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setLoading(false);
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// 提供更友好的错误信息
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if (error.message.includes('CORS') || error.message.includes('cross-origin')) {
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alert('图片下载失败:跨域访问被阻止。请尝试刷新页面后重新选择图片。');
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// 提供更具体的错误信息
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let errorMessage = '图片下载失败,请重试。';
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if (error.message.includes('cloneNode')) {
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errorMessage = '页面还未完全加载,请等待几秒后重试。';
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} else if (error.message.includes('CORS') || error.message.includes('cross-origin')) {
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errorMessage = '图片下载失败:跨域访问被阻止。请尝试刷新页面后重新选择图片。';
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} else if (error.message.includes('网络')) {
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alert('图片下载失败:网络连接问题。请检查网络连接后重试。');
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} else {
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alert('图片下载失败,请重试。如果问题持续存在,请尝试选择其他图片。');
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errorMessage = '图片下载失败:网络连接问题。请检查网络连接后重试。';
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} else if (error.message.includes('无法找到要下载的元素')) {
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errorMessage = '页面还未准备好,请稍等片刻后重试。';
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}
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alert(errorMessage);
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}
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}
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