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Dark theme implementation #505
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* | ||
| * ConvertX Theme Toggle | ||
| * | ||
| * - Stores explicit user choice in localStorage under KEY. | ||
| * - If no explicit choice exists, the UI follows the OS preference | ||
| * (prefers-color-scheme) and does not set data-theme. | ||
| */ | ||
|
|
||
| (() => { | ||
| const KEY = "convertx-theme"; | ||
| const root = document.documentElement; | ||
|
|
||
| const mql = window.matchMedia?.("(prefers-color-scheme: dark)"); | ||
|
|
||
| const getStoredTheme = () => { | ||
| try { | ||
| const v = localStorage.getItem(KEY); | ||
| return v === "dark" || v === "light" ? v : null; | ||
| } catch { | ||
| return null; | ||
| } | ||
| }; | ||
|
|
||
| const getSystemTheme = () => (mql && mql.matches ? "dark" : "light"); | ||
|
|
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| const getEffectiveTheme = () => getStoredTheme() ?? getSystemTheme(); | ||
|
|
||
| const setTheme = (theme, { persist } = { persist: true }) => { | ||
| if (theme !== "dark" && theme !== "light") return; | ||
|
|
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| root.setAttribute("data-theme", theme); | ||
| // Hint to the browser for built-in UI (form controls, scrollbars, etc.) | ||
| root.style.colorScheme = theme; | ||
|
|
||
| if (persist) { | ||
| try { | ||
| localStorage.setItem(KEY, theme); | ||
| } catch { | ||
| // ignore | ||
| } | ||
| } | ||
| }; | ||
|
|
||
| const clearThemeOverride = () => { | ||
| root.removeAttribute("data-theme"); | ||
| root.style.colorScheme = ""; | ||
| try { | ||
| localStorage.removeItem(KEY); | ||
| } catch { | ||
| // ignore | ||
| } | ||
| }; | ||
|
|
||
| const syncUI = () => { | ||
| const checkbox = document.getElementById("cx-theme-switch"); | ||
| const label = document.getElementById("cx-theme-label"); | ||
|
|
||
| if (!checkbox && !label) return; | ||
|
|
||
| const theme = getEffectiveTheme(); | ||
|
|
||
| if (checkbox) { | ||
| checkbox.checked = theme === "dark"; | ||
| checkbox.setAttribute( | ||
| "aria-checked", | ||
| checkbox.checked ? "true" : "false", | ||
| ); | ||
| } | ||
|
|
||
| if (label) { | ||
| label.textContent = theme === "dark" ? "Dark" : "Light"; | ||
| } | ||
| }; | ||
|
|
||
| // --- Initial state --- | ||
| // If the user chose a theme before, enforce it. | ||
| const stored = getStoredTheme(); | ||
| if (stored) { | ||
| setTheme(stored, { persist: false }); | ||
| } | ||
|
|
||
| // Keep the toggle in sync once the DOM is available. | ||
| document.addEventListener("DOMContentLoaded", () => { | ||
| syncUI(); | ||
|
|
||
| const checkbox = document.getElementById("cx-theme-switch"); | ||
| if (!checkbox) return; | ||
|
|
||
| checkbox.addEventListener("change", () => { | ||
| // Explicit user choice always overrides system. | ||
| setTheme(checkbox.checked ? "dark" : "light", { persist: true }); | ||
| syncUI(); | ||
| }); | ||
| }); | ||
|
|
||
| // If there's no explicit override, reflect OS changes in the UI. | ||
| if (mql) { | ||
| const onChange = () => { | ||
| if (getStoredTheme() == null) { | ||
| clearThemeOverride(); | ||
| syncUI(); | ||
| } | ||
| }; | ||
| // Safari uses addListener/removeListener | ||
| if (typeof mql.addEventListener === "function") { | ||
| mql.addEventListener("change", onChange); | ||
| } else if (typeof mql.addListener === "function") { | ||
| mql.addListener(onChange); | ||
| } | ||
| } | ||
| })(); | ||
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