Ruview/ui/utils/theme-toggle.js
Natalia Szczepanik f50a705dfc feat(ui): add keyboard shortcuts, perf monitor, toast system, theme toggle, and WCAG accessibility
- Keyboard shortcuts overlay (press ? for help, 1-8 for tabs, T for theme, P for perf)
- Real-time performance monitor with FPS, memory, latency sparklines (draggable)
- Enhanced toast notification system with stacking, auto-dismiss, progress bars
- Dark/light theme toggle with localStorage persistence and system preference detection
- WCAG accessibility: skip-to-content link, ARIA roles/attributes on tabs and panels,
  arrow key navigation in tab bar, focus-visible outlines
- ESLint config for UI directory with security and quality rules
2026-03-25 21:41:08 +01:00

86 lines
3 KiB
JavaScript

// Theme Toggle - Manual dark/light mode switch with persistence
export class ThemeToggle {
constructor() {
this.button = null;
this.currentTheme = this.getSavedTheme() || this.getSystemTheme();
}
init() {
this.createButton();
this.applyTheme(this.currentTheme);
document.addEventListener('toggle-theme', () => this.toggle());
// Listen for system theme changes
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', (e) => {
if (!this.getSavedTheme()) {
this.applyTheme(e.matches ? 'dark' : 'light');
}
});
}
createButton() {
this.button = document.createElement('button');
this.button.className = 'theme-toggle';
this.button.setAttribute('aria-label', 'Toggle dark/light theme');
this.button.setAttribute('title', 'Toggle theme (T)');
this.updateIcon();
this.button.addEventListener('click', () => this.toggle());
// Insert into header
const headerInfo = document.querySelector('.header-info');
if (headerInfo) {
headerInfo.prepend(this.button);
} else {
const header = document.querySelector('.header');
if (header) header.appendChild(this.button);
}
}
toggle() {
this.currentTheme = this.currentTheme === 'dark' ? 'light' : 'dark';
this.applyTheme(this.currentTheme);
this.saveTheme(this.currentTheme);
}
applyTheme(theme) {
this.currentTheme = theme;
document.documentElement.setAttribute('data-color-scheme', theme);
this.updateIcon();
}
updateIcon() {
if (!this.button) return;
const isDark = this.currentTheme === 'dark';
this.button.innerHTML = isDark
? '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg>'
: '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/></svg>';
this.button.setAttribute('aria-label', isDark ? 'Switch to light theme' : 'Switch to dark theme');
}
getSystemTheme() {
return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
}
getSavedTheme() {
try {
return localStorage.getItem('ruview-theme');
} catch {
return null;
}
}
saveTheme(theme) {
try {
localStorage.setItem('ruview-theme', theme);
} catch {
// localStorage not available
}
}
dispose() {
if (this.button?.parentNode) {
this.button.parentNode.removeChild(this.button);
}
}
}