ka-cn
/
vibe-coding-cn


			
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							<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Markdown 编辑与预览 (带同步滚动和滑块)</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js"></script>
    <script src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
    <style>
        body {
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
            background: #f0f0f0;
            margin: 0;
            font-family: 'Arial', sans-serif;
            padding-top: 20px;
            overflow: hidden; /* Prevent body scrollbars if editor is full height */
        }
        .editor-container {
            display: flex;
            width: 90%; /* Use percentage for better responsiveness */
            max-width: 1200px; /* Max width for large screens */
            height: calc(100vh - 100px); /* Adjust height to fill more of the viewport */
            background: #333333;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            position: relative; /* For resizer positioning if needed */
        }
        .markdown-editor, .preview-pane {
            padding: 20px;
            box-sizing: border-box;
            overflow-y: auto;
            height: 100%; /* Fill the container height */
        }
        .markdown-editor {
            /* flex: 1; Will be set by JS */
            background: #222222;
            color: #e0e0e0;
            border: none;
            resize: none;
            font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
            font-size: 14px;
            line-height: 1.6;
            outline: none;
        }
        .resizer {
            flex: 0 0 10px; /* Don't grow, don't shrink, base width 10px */
            background: #555555;
            cursor: col-resize;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            user-select: none; /* Prevent text selection during drag */
        }
        .resizer::before { /* Optional: visual indicator for dragging */
            content: '⋮';
            color: #aaa;
            font-size: 18px;
            line-height: 0;
        }
        .preview-pane {
            /* flex: 1; Will be set by JS */
            background: #000000;
            color: #ffffff;
            /* border-left: 2px solid #666666; /* Replaced by resizer */
            word-wrap: break-word;
        }

        /* Styling for rendered Markdown elements in preview-pane */
        .preview-pane h1, .preview-pane h2, .preview-pane h3, .preview-pane h4, .preview-pane h5, .preview-pane h6 {
            color: #ffffff;
            border-bottom: 1px solid #444444;
            padding-bottom: 5px;
            margin-top: 1em;
            margin-bottom: 0.5em;
        }
        .preview-pane h1 { font-size: 24px; font-weight: bold; border-bottom: 2px solid #666666; padding-bottom: 10px; margin-bottom: 15px;}
        .preview-pane p {
            font-size: 16px;
            line-height: 1.5;
            margin-bottom: 1em;
        }
        .preview-pane ul, .preview-pane ol {
            margin-left: 20px;
            margin-bottom: 1em;
        }
        .preview-pane li {
            margin-bottom: 0.5em;
        }
        .preview-pane blockquote {
            border-left: 4px solid #555555;
            padding-left: 10px;
            color: #aaaaaa;
            margin-left: 0;
            margin-right: 0;
            margin-bottom: 1em;
        }
        .preview-pane pre {
            background-color: #1e1e1e;
            padding: 10px;
            border-radius: 4px;
            overflow-x: auto;
            font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
        }
        .preview-pane code {
            font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
            background-color: #282c34;
            padding: 2px 4px;
            border-radius: 3px;
            font-size: 0.9em;
        }
        .preview-pane pre code {
            background-color: transparent;
            padding: 0;
            border-radius: 0;
        }
        .preview-pane table {
            border-collapse: collapse;
            width: 100%;
            margin-bottom: 1em;
        }
        .preview-pane th, .preview-pane td {
            border: 1px solid #666666;
            padding: 8px;
            text-align: left;
        }
        .preview-pane th {
            background-color: #1a1a1a;
        }
        .preview-pane img {
            max-width: 100%;
            height: auto;
            border-radius: 4px;
        }

        .button-container {
            margin-top: 20px;
            text-align: center;
        }
        .export-btn {
            padding: 10px 20px;
            background: #000000;
            color: #ffffff;
            border: 2px solid #666666;
            cursor: pointer;
            font-size: 16px;
        }
        .export-btn:hover {
            background: #333333;
        }
    </style>
</head>
<body>
    <div class="editor-container">
        <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>
        <div id="resizer" class="resizer"></div>
        <div id="preview-output" class="preview-pane"></div>
    </div>
    <div class="button-container">
        <button class="export-btn" onclick="exportToPng()">导出为PNG</button>
    </div>

    <script>
        const markdownInput = document.getElementById('markdown-input');
        const previewOutput = document.getElementById('preview-output');
        const resizer = document.getElementById('resizer');
        const editorContainer = document.querySelector('.editor-container');

        // Initial flex distribution
        markdownInput.style.flex = '1';
        previewOutput.style.flex = '1';
        
        const converter = new showdown.Converter({
            tables: true,
            strikethrough: true,
            tasklists: true,
            ghCompatibleHeaderId: true,
            simpleLineBreaks: true
        });
        converter.setFlavor('github');

        function renderMarkdown() {
            const markdownText = markdownInput.value;
            const html = converter.makeHtml(markdownText);
            previewOutput.innerHTML = html;
        }

        markdownInput.addEventListener('input', renderMarkdown);
        renderMarkdown(); // Initial render

        // --- Resizer Logic ---
        let isResizing = false;
        let startX, startEditorWidth, startPreviewWidth;

        resizer.addEventListener('mousedown', (e) => {
            e.preventDefault(); // Prevent text selection, etc.
            isResizing = true;
            startX = e.clientX;
            startEditorWidth = markdownInput.offsetWidth;
            startPreviewWidth = previewOutput.offsetWidth;

            document.addEventListener('mousemove', handleMouseMove);
            document.addEventListener('mouseup', stopResize);
        });

        function handleMouseMove(e) {
            if (!isResizing) return;

            const dx = e.clientX - startX;
            let newEditorWidth = startEditorWidth + dx;
            let newPreviewWidth = startPreviewWidth - dx;

            const minWidth = 50; // Minimum width for panes

            if (newEditorWidth < minWidth) {
                newEditorWidth = minWidth;
                newPreviewWidth = startEditorWidth + startPreviewWidth - minWidth;
            } else if (newPreviewWidth < minWidth) {
                newPreviewWidth = minWidth;
                newEditorWidth = startEditorWidth + startPreviewWidth - minWidth;
            }
            
            const totalWidth = editorContainer.offsetWidth - resizer.offsetWidth;
            markdownInput.style.flex = `0 0 ${newEditorWidth}px`;
            previewOutput.style.flex = `0 0 ${newPreviewWidth}px`;
        }

        function stopResize() {
            isResizing = false;
            document.removeEventListener('mousemove', handleMouseMove);
            document.removeEventListener('mouseup', stopResize);
        }

        // --- Synchronized Scrolling ---
        let scrollTimeout;
        let isSyncingEditor = false;
        let isSyncingPreview = false;

        markdownInput.addEventListener('scroll', () => {
            if (isSyncingEditor) {
                isSyncingEditor = false; // Reset for next manual scroll
                return;
            }
            if (isResizing) return; // Don't sync scroll while resizing

            isSyncingPreview = true; // Prevent preview scroll from triggering editor scroll
            
            const scrollPercentage = markdownInput.scrollTop / (markdownInput.scrollHeight - markdownInput.clientHeight);
            if (isNaN(scrollPercentage)) return; // Avoid NaN if scrollHeight equals clientHeight

            previewOutput.scrollTop = scrollPercentage * (previewOutput.scrollHeight - previewOutput.clientHeight);
            
            // Clear any existing timeout to avoid race conditions
            clearTimeout(scrollTimeout);
            scrollTimeout = setTimeout(() => {
                isSyncingPreview = false;
            }, 100); // Adjust delay as needed
        });

        previewOutput.addEventListener('scroll', () => {
            if (isSyncingPreview) {
                isSyncingPreview = false; // Reset for next manual scroll
                return;
            }
            if (isResizing) return; // Don't sync scroll while resizing

            isSyncingEditor = true; // Prevent editor scroll from triggering preview scroll

            const scrollPercentage = previewOutput.scrollTop / (previewOutput.scrollHeight - previewOutput.clientHeight);
            if (isNaN(scrollPercentage)) return;

            markdownInput.scrollTop = scrollPercentage * (markdownInput.scrollHeight - markdownInput.clientHeight);
            
            clearTimeout(scrollTimeout);
            scrollTimeout = setTimeout(() => {
                isSyncingEditor = false;
            }, 100); // Adjust delay as needed
        });


        function exportToPng() {
            const previewPane = document.getElementById('preview-output');
            const originalHeight = previewPane.style.height;
            const originalOverflowY = previewPane.style.overflowY;

            previewPane.style.height = previewPane.scrollHeight + 'px';
            previewPane.style.overflowY = 'visible';
            previewPane.style.backgroundColor = '#000000';

            html2canvas(previewPane, {
                backgroundColor: '#000000',
                scale: 2,
                useCORS: true,
                logging: false,
                onclone: (documentClone) => {
                    const clonedPreviewPane = documentClone.getElementById('preview-output');
                    if (clonedPreviewPane) {
                        clonedPreviewPane.style.backgroundColor = '#000000';
                        clonedPreviewPane.style.color = '#ffffff';
                        clonedPreviewPane.style.height = clonedPreviewPane.scrollHeight + 'px';
                        clonedPreviewPane.style.overflowY = 'visible';
                    }
                }
            }).then(canvas => {
                const link = document.createElement('a');
                link.download = 'markdown_card.png';
                link.href = canvas.toDataURL('image/png');
                link.click();
            }).finally(() => {
                previewPane.style.height = originalHeight;
                previewPane.style.overflowY = originalOverflowY;
            });
        }
    </script>
</body>
</html>