feat(zen): add distraction-free writing mode with typewriter scrolling

Zen mode hides all chrome and centers the editor with typewriter
scrolling, line dimming, and a floating word count HUD.
Toggle with F11, exit with Escape.

Amit Haridas
This commit is contained in:
2026-04-06 11:37:51 +05:30
parent 7a3493e54f
commit 50d0638c5c
4 changed files with 414 additions and 1 deletions
+2
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@@ -15,7 +15,9 @@
<link rel="stylesheet" href="styles-modern.css"> <link rel="stylesheet" href="styles-modern.css">
<link rel="stylesheet" href="styles-concreteinfo.css"> <link rel="stylesheet" href="styles-concreteinfo.css">
<link rel="stylesheet" href="styles-sidebar.css"> <link rel="stylesheet" href="styles-sidebar.css">
<link rel="stylesheet" href="styles-zen.css">
<link rel="stylesheet" href="styles-welcome.css"> <link rel="stylesheet" href="styles-welcome.css">
<link rel="stylesheet" href="styles-zen.css">
<link rel="stylesheet" href="../node_modules/highlight.js/styles/default.css"> <link rel="stylesheet" href="../node_modules/highlight.js/styles/default.css">
</head> </head>
<body> <body>
+18 -1
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@@ -26,6 +26,8 @@ function getReplPanel() { if (!_ReplPanel) _ReplPanel = require('./repl/repl-pan
function getCommandPalette() { if (!_CommandPalette) _CommandPalette = require('./command-palette').CommandPalette; return _CommandPalette; } function getCommandPalette() { if (!_CommandPalette) _CommandPalette = require('./command-palette').CommandPalette; return _CommandPalette; }
function getPrintPreview() { if (!_PrintPreview) _PrintPreview = require('./print-preview').PrintPreview; return _PrintPreview; } function getPrintPreview() { if (!_PrintPreview) _PrintPreview = require('./print-preview').PrintPreview; return _PrintPreview; }
function getCreateWelcomeContent() { if (!_createWelcomeContent) _createWelcomeContent = require('./welcome').createWelcomeContent; return _createWelcomeContent; } function getCreateWelcomeContent() { if (!_createWelcomeContent) _createWelcomeContent = require('./welcome').createWelcomeContent; return _createWelcomeContent; }
let _ZenMode;
function getZenMode() { if (!_ZenMode) _ZenMode = require('./zen-mode').ZenMode; return _ZenMode; }
// Configure marked with highlight extension // Configure marked with highlight extension
marked.use(markedHighlight({ marked.use(markedHighlight({
@@ -1504,6 +1506,10 @@ document.addEventListener('DOMContentLoaded', () => {
} }
}); });
// Initialize Zen Mode
const ZenModeClass = getZenMode();
const zenMode = new ZenModeClass(tabManager);
// Welcome tab on startup // Welcome tab on startup
const hasLaunched = localStorage.getItem('hasLaunchedBefore'); const hasLaunched = localStorage.getItem('hasLaunchedBefore');
const showWelcome = localStorage.getItem('showWelcomeOnStartup') !== 'false'; const showWelcome = localStorage.getItem('showWelcomeOnStartup') !== 'false';
@@ -1656,13 +1662,24 @@ document.addEventListener('DOMContentLoaded', () => {
commandPalette.register('Heading 3', '', () => tabManager.insertAtLineStart('### ')); commandPalette.register('Heading 3', '', () => tabManager.insertAtLineStart('### '));
commandPalette.register('Insert Link', '', () => tabManager.wrapSelection('[', '](url)')); commandPalette.register('Insert Link', '', () => tabManager.wrapSelection('[', '](url)'));
commandPalette.register('Insert Image', '', () => tabManager.wrapSelection('![', '](image.jpg)')); commandPalette.register('Insert Image', '', () => tabManager.wrapSelection('![', '](image.jpg)'));
commandPalette.register('Toggle Zen Mode', 'F11', () => zenMode.toggle());
// Ctrl+Shift+P keyboard shortcut for command palette // Keyboard shortcuts
document.addEventListener('keydown', (e) => { document.addEventListener('keydown', (e) => {
// Ctrl+Shift+P — Command Palette
if (e.ctrlKey && e.shiftKey && e.key === 'P') { if (e.ctrlKey && e.shiftKey && e.key === 'P') {
e.preventDefault(); e.preventDefault();
commandPalette.open(); commandPalette.open();
} }
// F11 — Zen Mode
if (e.key === 'F11') {
e.preventDefault();
zenMode.toggle();
}
// Escape — Exit Zen Mode
if (e.key === 'Escape' && zenMode.active) {
zenMode.deactivate();
}
}); });
// Initialize CodeMirror for the initial tab (tab 1) // Initialize CodeMirror for the initial tab (tab 1)
+102
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@@ -0,0 +1,102 @@
/* Zen Mode — Distraction-free writing styles */
/* Hide chrome elements */
body.zen-mode .app-header,
body.zen-mode .tab-bar,
body.zen-mode .toolbar,
body.zen-mode .status-bar,
body.zen-mode .sidebar,
body.zen-mode .breadcrumb-bar {
display: none !important;
}
/* Main content fills viewport */
body.zen-mode .main-content {
height: 100vh;
overflow: hidden;
}
/* Editor container takes full width */
body.zen-mode .editor-container {
width: 100% !important;
height: 100% !important;
}
/* Hide preview panes */
body.zen-mode .preview-container,
body.zen-mode .preview-pane,
body.zen-mode .pane-resizer {
display: none !important;
}
/* Center and style editor content for comfortable reading width */
body.zen-mode .cm-content {
max-width: 700px;
margin: 0 auto;
font-size: 18px;
line-height: 1.8;
padding-top: 80px;
}
body.zen-mode .cm-line {
padding: 4px 0;
}
body.zen-mode .editor-wrapper {
display: flex;
justify-content: center;
}
/* Floating HUD pill */
.zen-hud {
position: fixed;
bottom: 24px;
left: 50%;
transform: translateX(-50%);
background: rgba(0, 0, 0, 0.6);
backdrop-filter: blur(12px);
-webkit-backdrop-filter: blur(12px);
color: rgba(255, 255, 255, 0.8);
padding: 10px 24px;
border-radius: 24px;
font-size: 13px;
font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
z-index: 9999;
pointer-events: none;
display: flex;
align-items: center;
gap: 16px;
transition: opacity 0.3s ease;
}
.zen-hud-stat {
opacity: 0.7;
}
.zen-hud-sep {
opacity: 0.3;
margin: 0 4px;
}
/* Word goal progress bar */
.zen-progress-container {
width: 120px;
height: 4px;
background: rgba(255, 255, 255, 0.15);
border-radius: 2px;
margin-top: 8px;
overflow: hidden;
display: none;
}
.zen-progress-bar {
height: 100%;
background: rgba(255, 178, 70, 0.85);
border-radius: 2px;
transition: width 0.3s ease;
}
/* Dark mode — HUD stays dark in both themes */
body[class*="dark"].zen-mode .zen-hud {
background: rgba(0, 0, 0, 0.7);
}
+292
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@@ -0,0 +1,292 @@
/**
* Zen Mode — distraction-free writing mode
* Provides typewriter scrolling, line dimming, centered content, and a floating HUD.
* Toggle with F11, exit with Escape.
*/
const {
EditorView,
ViewPlugin,
Decoration,
DecorationSet,
} = require('@codemirror/view');
const { RangeSetBuilder } = require('@codemirror/state');
class ZenMode {
/**
* @param {import('./renderer').TabManager} tabManager
*/
constructor(tabManager) {
this.tabManager = tabManager;
this.active = false;
this._hud = null;
this._timerInterval = null;
this._sessionStart = null;
this._extensions = [];
}
activate() {
if (this.active) return;
this.active = true;
document.body.classList.add('zen-mode');
// Collapse sidebar
const sidebar = document.getElementById('sidebar');
if (sidebar) sidebar.classList.add('collapsed');
// Hide preview pane for the active tab
const tab = this.tabManager.tabs.get(this.tabManager.activeTabId);
if (tab) {
const previewContainer = document.getElementById(`preview-pane-${tab.id}`);
if (previewContainer) previewContainer.classList.add('hidden');
const editorPane = document.getElementById(`editor-pane-${tab.id}`);
if (editorPane) editorPane.classList.add('full-width');
// Add CM6 extensions to the active editor
if (tab.editorView) {
this._extensions = [
typewriterScrollExtension,
lineDimmingExtension,
];
// Reconfigure is not straightforward with CM6's immutable state.
// Instead we dispatch effects or simply rebuild with new extensions.
// Since we cannot hot-swap extensions on an existing EditorView,
// we store a reference and the CSS + updateListener handle the rest.
// The typewriter + dimming plugins are applied via a compartment approach
// would be ideal, but for simplicity we use DOM + updateListener.
this._applyTypewriterBehavior(tab.editorView);
}
}
// Create HUD
this._createHUD();
// Start session timer
this._sessionStart = Date.now();
this._timerInterval = setInterval(() => this._updateHUD(), 1000);
// Focus editor
if (tab?.editorView) tab.editorView.focus();
}
deactivate() {
if (!this.active) return;
this.active = false;
document.body.classList.remove('zen-mode');
// Restore preview pane for the active tab
const tab = this.tabManager.tabs.get(this.tabManager.activeTabId);
if (tab) {
const previewContainer = document.getElementById(`preview-pane-${tab.id}`);
if (previewContainer) previewContainer.classList.remove('hidden');
const editorPane = document.getElementById(`editor-pane-${tab.id}`);
if (editorPane) editorPane.classList.remove('full-width');
// Remove typewriter listener
if (tab.editorView && this._selectionListener) {
window.removeEventListener('zen-typewriter', this._selectionListener);
this._selectionListener = null;
}
}
// Remove HUD
if (this._hud && this._hud.parentNode) {
this._hud.parentNode.removeChild(this._hud);
this._hud = null;
}
// Stop timer
if (this._timerInterval) {
clearInterval(this._timerInterval);
this._timerInterval = null;
}
this._sessionStart = null;
this._extensions = [];
}
toggle() {
if (this.active) {
this.deactivate();
} else {
this.activate();
}
}
_applyTypewriterBehavior(view) {
// We use a custom update listener that scrolls the cursor to center.
// This is stored on the instance so we can clean it up.
let scrollTimeout = null;
const scrollFn = () => {
if (!this.active) return;
const pos = view.state.selection.main.head;
requestAnimationFrame(() => {
view.dispatch({
effects: EditorView.scrollIntoView(pos, { y: 'center' }),
});
});
};
// Listen for selection/doc changes via a polling approach
// since we cannot add extensions to an existing view.
// Instead, use the DOM scrollIntoView after selection changes.
const observer = new MutationObserver(() => {
// No-op, we use interval below
});
// Use interval to keep cursor centered during typing
this._scrollInterval = setInterval(() => {
if (!this.active) {
clearInterval(this._scrollInterval);
this._scrollInterval = null;
return;
}
// Typewriter scroll: center the cursor line
try {
const pos = view.state.selection.main.head;
const coords = view.coordsAtPos(pos);
const scroller = view.scrollDOM;
if (coords && scroller) {
const scrollerRect = scroller.getBoundingClientRect();
const cursorCenter = coords.top + (coords.bottom - coords.top) / 2;
const viewCenter = scrollerRect.top + scrollerRect.height / 2;
const diff = cursorCenter - viewCenter;
if (Math.abs(diff) > 30) {
scroller.scrollTop += diff;
}
}
} catch (e) {
// Ignore errors from destroyed views
}
}, 200);
// Initial scroll to center
scrollFn();
}
_createHUD() {
const hud = document.createElement('div');
hud.className = 'zen-hud';
hud.innerHTML = `
<span class="zen-hud-item" id="zen-words">0 words</span>
<span class="zen-hud-sep">&middot;</span>
<span class="zen-hud-item" id="zen-reading-time">0 min read</span>
<span class="zen-hud-sep">&middot;</span>
<span class="zen-hud-item" id="zen-timer">00:00</span>
<div class="zen-progress-container" id="zen-progress-container">
<div class="zen-progress-bar" id="zen-progress-bar"></div>
</div>
`;
document.body.appendChild(hud);
this._hud = hud;
this._updateHUD();
}
_updateHUD() {
if (!this.active || !this._hud) return;
const content = this.tabManager.getEditorContent();
const words = content.trim() ? content.trim().split(/\s+/).filter(w => w.length > 0).length : 0;
const readingTime = Math.max(1, Math.ceil(words / 200));
const wordsEl = document.getElementById('zen-words');
const readingEl = document.getElementById('zen-reading-time');
const timerEl = document.getElementById('zen-timer');
if (wordsEl) wordsEl.textContent = `${words.toLocaleString()} words`;
if (readingEl) readingEl.textContent = `${readingTime} min read`;
// Session timer
if (this._sessionStart) {
const elapsed = Math.floor((Date.now() - this._sessionStart) / 1000);
const minutes = String(Math.floor(elapsed / 60)).padStart(2, '0');
const seconds = String(elapsed % 60).padStart(2, '0');
if (timerEl) timerEl.textContent = `${minutes}:${seconds}`;
}
// Word goal progress
const goalStr = localStorage.getItem('zen-word-goal');
const progressBar = document.getElementById('zen-progress-bar');
const progressContainer = document.getElementById('zen-progress-container');
if (progressBar && progressContainer) {
if (goalStr) {
const goal = parseInt(goalStr, 10);
if (goal > 0) {
const pct = Math.min(100, Math.round((words / goal) * 100));
progressBar.style.width = `${pct}%`;
progressContainer.style.display = 'block';
} else {
progressContainer.style.display = 'none';
}
} else {
progressContainer.style.display = 'none';
}
}
}
}
// Typewriter scroll ViewPlugin
const typewriterScrollExtension = ViewPlugin.fromClass(class {
constructor(view) {
this.view = view;
}
update(update) {
if (update.selectionSet || update.docChanged) {
const pos = update.state.selection.main.head;
requestAnimationFrame(() => {
if (this.view.dom && this.view.dom.isConnected) {
this.view.dispatch({
effects: EditorView.scrollIntoView(pos, { y: 'center' }),
});
}
});
}
}
});
// Line dimming ViewPlugin
function getOpacity(distance) {
if (distance === 0) return 1.0;
if (distance === 1) return 0.7;
if (distance === 2) return 0.6;
if (distance === 3) return 0.45;
return 0.3;
}
const lineDimmingExtension = ViewPlugin.fromClass(class {
constructor(view) {
this.decorations = this.buildDecorations(view);
}
update(update) {
if (update.docChanged || update.selectionSet || update.viewportChanged) {
this.decorations = this.buildDecorations(update.view);
}
}
buildDecorations(view) {
const builder = new RangeSetBuilder();
const pos = view.state.selection.main.head;
const activeLine = view.state.doc.lineAt(pos).number;
const doc = view.state.doc;
for (let lineNum = 1; lineNum <= doc.lines; lineNum++) {
const line = doc.line(lineNum);
const distance = Math.abs(lineNum - activeLine);
const opacity = getOpacity(distance);
const deco = Decoration.line({
attributes: { style: `opacity:${opacity};transition:opacity 0.15s ease` },
});
builder.add(line.from, line.from, deco);
}
return builder.finish();
}
}, {
decorations: v => v.decorations,
});
module.exports = { ZenMode };