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feat: Add collapsible code blocks (fixes #2425) #3776

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feat: Add collapsible code blocks (fixes #2425) #3776

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124 changes: 124 additions & 0 deletions browser/components/MarkdownPreview.js
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Original file line number Diff line number Diff line change
Expand Up @@ -516,6 +516,130 @@ class MarkdownPreview extends React.Component {
el.innerHTML = ''
el.parentNode.className += ` ${codeBlockThemeClassName}`

// Check if code block is long enough to be collapsible (15+ lines)
const lineCount = (content.match(/\n/g) || []).length + 1
const MAX_LINES_BEFORE_COLLAPSE = 15
const codeBlockContainer = el.parentNode

if (lineCount > MAX_LINES_BEFORE_COLLAPSE) {
// Add collapsible class and CSS
codeBlockContainer.classList.add('collapsible-code-block')
codeBlockContainer.classList.add('collapsed')

// Create expand/collapse button
const collapseIcon = document.createElement('button')
collapseIcon.className = 'collapse-expand-button'
collapseIcon.innerHTML = '▼'
collapseIcon.title = 'Click to expand/collapse'
collapseIcon.style.cssText = `
position: absolute;
top: 5px;
left: 5px;
z-index: 10;
border-radius: 3px;
cursor: pointer;
font-size: 10px;
width: 20px;
height: 20px;
padding: 0;
display: flex;
align-items: center;
justify-content: center;
border: 1px solid;
`

collapseIcon.onclick = e => {
e.preventDefault()
e.stopPropagation()
if (codeBlockContainer.classList.contains('collapsed')) {
codeBlockContainer.classList.remove('collapsed')
codeBlockContainer.classList.add('expanded')
collapseIcon.innerHTML = '▲'
} else {
codeBlockContainer.classList.remove('expanded')
codeBlockContainer.classList.add('collapsed')
collapseIcon.innerHTML = '▼'
}
}

// Insert button at the beginning of the code block
codeBlockContainer.style.position = 'relative'
codeBlockContainer.appendChild(collapseIcon)

// Add inline styles for collapse behavior
if (!this.getWindow().document.getElementById('collapsible-code-styles')) {
const styleEl = document.createElement('style')
styleEl.id = 'collapsible-code-styles'
styleEl.textContent = `
.collapsible-code-block.collapsed {
max-height: 300px !important;
overflow: hidden !important;
position: relative;
}
.collapsible-code-block.collapsed::after {
content: '';
position: absolute;
bottom: 0;
left: 0;
right: 0;
height: 30px;
pointer-events: none;
}
/* Light theme gradient */
[data-theme="default"] .collapsible-code-block.collapsed::after,
[data-theme="white"] .collapsible-code-block.collapsed::after {
background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.9));
}
/* Dark theme gradient */
[data-theme="dark"] .collapsible-code-block.collapsed::after,
[data-theme="dracula"] .collapsible-code-block.collapsed::after,
[data-theme="monokai"] .collapsible-code-block.collapsed::after,
[data-theme="nord"] .collapsible-code-block.collapsed::after,
[data-theme="solarized-dark"] .collapsible-code-block.collapsed::after,
[data-theme="vulcan"] .collapsible-code-block.collapsed::after {
background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.7));
}
.collapsible-code-block.expanded {
max-height: none !important;
}
.collapsible-code-block.expanded::after {
display: none;
}
/* Button styles for light themes */
[data-theme="default"] .collapse-expand-button,
[data-theme="white"] .collapse-expand-button {
background: rgba(255, 255, 255, 0.8);
border-color: #ccc;
color: #333;
}
[data-theme="default"] .collapse-expand-button:hover,
[data-theme="white"] .collapse-expand-button:hover {
background: rgba(255, 255, 255, 0.9);
}
/* Button styles for dark themes */
[data-theme="dark"] .collapse-expand-button,
[data-theme="dracula"] .collapse-expand-button,
[data-theme="monokai"] .collapse-expand-button,
[data-theme="nord"] .collapse-expand-button,
[data-theme="solarized-dark"] .collapse-expand-button,
[data-theme="vulcan"] .collapse-expand-button {
background: rgba(0, 0, 0, 0.6);
border-color: #666;
color: #fff;
}
[data-theme="dark"] .collapse-expand-button:hover,
[data-theme="dracula"] .collapse-expand-button:hover,
[data-theme="monokai"] .collapse-expand-button:hover,
[data-theme="nord"] .collapse-expand-button:hover,
[data-theme="solarized-dark"] .collapse-expand-button:hover,
[data-theme="vulcan"] .collapse-expand-button:hover {
background: rgba(0, 0, 0, 0.8);
}
`
this.getWindow().document.head.appendChild(styleEl)
}
}

CodeMirror.runMode(content, syntax.mime, el, {
tabSize: indentSize
})
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