320 lines
12 KiB
HTML
320 lines
12 KiB
HTML
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Markdown 编辑与预览 (带同步滚动和滑块)</title>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js"></script>
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<script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
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<style>
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body {
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display: flex;
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flex-direction: column;
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align-items: center;
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min-height: 100vh;
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background: #f0f0f0;
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margin: 0;
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font-family: 'Arial', sans-serif;
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padding-top: 20px;
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overflow: hidden; /* Prevent body scrollbars if editor is full height */
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}
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.editor-container {
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display: flex;
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width: 90%; /* Use percentage for better responsiveness */
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max-width: 1200px; /* Max width for large screens */
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height: calc(100vh - 100px); /* Adjust height to fill more of the viewport */
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background: #333333;
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border-radius: 8px;
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overflow: hidden;
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box-shadow: 0 4px 8px rgba(0,0,0,0.2);
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position: relative; /* For resizer positioning if needed */
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}
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.markdown-editor, .preview-pane {
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padding: 20px;
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box-sizing: border-box;
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overflow-y: auto;
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height: 100%; /* Fill the container height */
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}
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.markdown-editor {
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/* flex: 1; Will be set by JS */
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background: #222222;
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color: #e0e0e0;
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border: none;
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resize: none;
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font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
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font-size: 14px;
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line-height: 1.6;
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outline: none;
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}
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.resizer {
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flex: 0 0 10px; /* Don't grow, don't shrink, base width 10px */
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background: #555555;
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cursor: col-resize;
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height: 100%;
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display: flex;
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align-items: center;
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justify-content: center;
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user-select: none; /* Prevent text selection during drag */
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}
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.resizer::before { /* Optional: visual indicator for dragging */
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content: '⋮';
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color: #aaa;
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font-size: 18px;
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line-height: 0;
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}
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.preview-pane {
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/* flex: 1; Will be set by JS */
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background: #000000;
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color: #ffffff;
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/* border-left: 2px solid #666666; /* Replaced by resizer */
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word-wrap: break-word;
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}
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/* Styling for rendered Markdown elements in preview-pane */
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.preview-pane h1, .preview-pane h2, .preview-pane h3, .preview-pane h4, .preview-pane h5, .preview-pane h6 {
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color: #ffffff;
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border-bottom: 1px solid #444444;
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padding-bottom: 5px;
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margin-top: 1em;
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margin-bottom: 0.5em;
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}
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.preview-pane h1 { font-size: 24px; font-weight: bold; border-bottom: 2px solid #666666; padding-bottom: 10px; margin-bottom: 15px;}
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.preview-pane p {
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font-size: 16px;
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line-height: 1.5;
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margin-bottom: 1em;
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}
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.preview-pane ul, .preview-pane ol {
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margin-left: 20px;
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margin-bottom: 1em;
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}
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.preview-pane li {
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margin-bottom: 0.5em;
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}
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.preview-pane blockquote {
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border-left: 4px solid #555555;
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padding-left: 10px;
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color: #aaaaaa;
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margin-left: 0;
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margin-right: 0;
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margin-bottom: 1em;
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}
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.preview-pane pre {
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background-color: #1e1e1e;
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padding: 10px;
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border-radius: 4px;
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overflow-x: auto;
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font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
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}
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.preview-pane code {
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font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
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background-color: #282c34;
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padding: 2px 4px;
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border-radius: 3px;
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font-size: 0.9em;
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}
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.preview-pane pre code {
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background-color: transparent;
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padding: 0;
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border-radius: 0;
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}
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.preview-pane table {
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border-collapse: collapse;
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width: 100%;
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margin-bottom: 1em;
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}
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.preview-pane th, .preview-pane td {
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border: 1px solid #666666;
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padding: 8px;
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text-align: left;
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}
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.preview-pane th {
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background-color: #1a1a1a;
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}
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.preview-pane img {
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max-width: 100%;
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height: auto;
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border-radius: 4px;
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}
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.button-container {
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margin-top: 20px;
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text-align: center;
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}
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.export-btn {
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padding: 10px 20px;
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background: #000000;
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color: #ffffff;
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border: 2px solid #666666;
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cursor: pointer;
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font-size: 16px;
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}
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.export-btn:hover {
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background: #333333;
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}
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</style>
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</head>
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<body>
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<div class="editor-container">
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<textarea id="markdown-input" class="markdown-editor" placeholder="在此输入 Markdown... 例如：\n# 标题\n\n- 列表项1\n- 列表项2\n\n**加粗文本**"></textarea>
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<div id="resizer" class="resizer"></div>
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<div id="preview-output" class="preview-pane"></div>
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</div>
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<div class="button-container">
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<button class="export-btn" onclick="exportToPng()">导出为PNG</button>
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</div>
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<script>
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const markdownInput = document.getElementById('markdown-input');
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const previewOutput = document.getElementById('preview-output');
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const resizer = document.getElementById('resizer');
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const editorContainer = document.querySelector('.editor-container');
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// Initial flex distribution
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markdownInput.style.flex = '1';
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previewOutput.style.flex = '1';
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const converter = new showdown.Converter({
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tables: true,
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strikethrough: true,
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tasklists: true,
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ghCompatibleHeaderId: true,
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simpleLineBreaks: true
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});
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converter.setFlavor('github');
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function renderMarkdown() {
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const markdownText = markdownInput.value;
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const html = converter.makeHtml(markdownText);
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previewOutput.innerHTML = html;
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}
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markdownInput.addEventListener('input', renderMarkdown);
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renderMarkdown(); // Initial render
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// --- Resizer Logic ---
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let isResizing = false;
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let startX, startEditorWidth, startPreviewWidth;
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resizer.addEventListener('mousedown', (e) => {
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e.preventDefault(); // Prevent text selection, etc.
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isResizing = true;
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startX = e.clientX;
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startEditorWidth = markdownInput.offsetWidth;
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startPreviewWidth = previewOutput.offsetWidth;
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document.addEventListener('mousemove', handleMouseMove);
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document.addEventListener('mouseup', stopResize);
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});
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function handleMouseMove(e) {
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if (!isResizing) return;
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const dx = e.clientX - startX;
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let newEditorWidth = startEditorWidth + dx;
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let newPreviewWidth = startPreviewWidth - dx;
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const minWidth = 50; // Minimum width for panes
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if (newEditorWidth < minWidth) {
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newEditorWidth = minWidth;
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newPreviewWidth = startEditorWidth + startPreviewWidth - minWidth;
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} else if (newPreviewWidth < minWidth) {
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newPreviewWidth = minWidth;
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newEditorWidth = startEditorWidth + startPreviewWidth - minWidth;
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}
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const totalWidth = editorContainer.offsetWidth - resizer.offsetWidth;
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markdownInput.style.flex = `0 0 ${newEditorWidth}px`;
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previewOutput.style.flex = `0 0 ${newPreviewWidth}px`;
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}
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function stopResize() {
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isResizing = false;
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document.removeEventListener('mousemove', handleMouseMove);
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document.removeEventListener('mouseup', stopResize);
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}
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// --- Synchronized Scrolling ---
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let scrollTimeout;
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let isSyncingEditor = false;
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let isSyncingPreview = false;
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markdownInput.addEventListener('scroll', () => {
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if (isSyncingEditor) {
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isSyncingEditor = false; // Reset for next manual scroll
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return;
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}
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if (isResizing) return; // Don't sync scroll while resizing
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isSyncingPreview = true; // Prevent preview scroll from triggering editor scroll
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const scrollPercentage = markdownInput.scrollTop / (markdownInput.scrollHeight - markdownInput.clientHeight);
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if (isNaN(scrollPercentage)) return; // Avoid NaN if scrollHeight equals clientHeight
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previewOutput.scrollTop = scrollPercentage * (previewOutput.scrollHeight - previewOutput.clientHeight);
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// Clear any existing timeout to avoid race conditions
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clearTimeout(scrollTimeout);
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scrollTimeout = setTimeout(() => {
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isSyncingPreview = false;
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}, 100); // Adjust delay as needed
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});
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previewOutput.addEventListener('scroll', () => {
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if (isSyncingPreview) {
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isSyncingPreview = false; // Reset for next manual scroll
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return;
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}
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if (isResizing) return; // Don't sync scroll while resizing
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isSyncingEditor = true; // Prevent editor scroll from triggering preview scroll
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const scrollPercentage = previewOutput.scrollTop / (previewOutput.scrollHeight - previewOutput.clientHeight);
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if (isNaN(scrollPercentage)) return;
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markdownInput.scrollTop = scrollPercentage * (markdownInput.scrollHeight - markdownInput.clientHeight);
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clearTimeout(scrollTimeout);
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scrollTimeout = setTimeout(() => {
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isSyncingEditor = false;
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}, 100); // Adjust delay as needed
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});
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function exportToPng() {
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const previewPane = document.getElementById('preview-output');
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const originalHeight = previewPane.style.height;
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const originalOverflowY = previewPane.style.overflowY;
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previewPane.style.height = previewPane.scrollHeight + 'px';
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previewPane.style.overflowY = 'visible';
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previewPane.style.backgroundColor = '#000000';
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html2canvas(previewPane, {
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backgroundColor: '#000000',
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scale: 2,
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useCORS: true,
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logging: false,
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onclone: (documentClone) => {
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const clonedPreviewPane = documentClone.getElementById('preview-output');
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if (clonedPreviewPane) {
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clonedPreviewPane.style.backgroundColor = '#000000';
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clonedPreviewPane.style.color = '#ffffff';
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clonedPreviewPane.style.height = clonedPreviewPane.scrollHeight + 'px';
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clonedPreviewPane.style.overflowY = 'visible';
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}
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}
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}).then(canvas => {
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const link = document.createElement('a');
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link.download = 'markdown_card.png';
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link.href = canvas.toDataURL('image/png');
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link.click();
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}).finally(() => {
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previewPane.style.height = originalHeight;
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previewPane.style.overflowY = originalOverflowY;
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});
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}
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</script>
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</body>
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</html> |