Desktop UI zoom, font size, and scaling controls

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

• #60457 feat(desktop): add UI scale setting to appearance settings (salvage #60249)

  merged to main

  files: apps/desktop/electron/main.cjs, apps/desktop/electron/preload.cjs, apps/desktop/electron/zoom.cjs, apps/desktop/electron/zoom.test.cjs, apps/desktop/package.json, apps/desktop/src/app/settings/appearance-settings.tsx, apps/desktop/src/global.d.ts, apps/desktop/src/i18n/en.ts, apps/desktop/src/i18n/ja.ts, apps/desktop/src/i18n/types.ts, apps/desktop/src/i18n/zh-hant.ts, apps/desktop/src/i18n/zh.ts, apps/desktop/src/store/zoom.ts

  Show the diff

  • apps/desktop/electron/main.cjs

    @@ -4167,17 +4167,15 @@ function installPreviewShortcut(window) {
     // survives reloads/restarts) rather than a main-process JSON file. The main
     // process owns setZoomLevel, so we mirror each change into localStorage and
     // read it back on did-finish-load to re-apply after reloads or crash recovery.
    -const ZOOM_STORAGE_KEY = 'hermes:desktop:zoomLevel'
    -
    -function clampZoomLevel(value) {
    -  if (!Number.isFinite(value)) return 0
    -  return Math.min(Math.max(value, -9), 9)
    -}
    +const { ZOOM_STORAGE_KEY, clampZoomLevel, percentToZoomLevel, zoomLevelToPercent } = require('./zoom.cjs')
     
     function setAndPersistZoomLevel(window, zoomLevel) {
       if (!window || window.isDestroyed()) return
       const next = clampZoomLevel(zoomLevel)
       window.webContents.setZoomLevel(next)
    +  // Keep any open settings UI in sync, including changes made via the
    +  // keyboard shortcuts or the View menu.
    +  window.webContents.send('hermes:zoom:changed', { level: next, percent: zoomLevelToPercent(next) })
       window.webContents
         .executeJavaScript(
           `try { localStorage.setItem(${JSON.stringify(ZOOM_STORAGE_KEY)}, ${JSON.stringify(String(next))}) } catch {}`
    @@ -6158,6 +6156,21 @@ ipcMain.handle('hermes:window:openNewSession', async () => {
       return { ok: true }
     })
     
    +// --- Text size (zoom) -------------------------------------------------------
    +// The settings UI drives the same clamped zoom scale as the Ctrl/Cmd
    +// shortcuts and the View menu. Reads and writes target the asking window.
    +ipcMain.handle('hermes:zoom:get', event => {
    +  const window = BrowserWindow.fromWebContents(event.sender)
    +  const level = window && !window.isDestroyed() ? window.webContents.getZoomLevel() : 0
    +
    +  return { level, percent: zoomLevelToPercent(level) }
    +})
    +ipcMain.on('hermes:zoom:set-percent', (event, percent) => {
    +  const window = BrowserWindow.fromWebContents(event.sender)
    +  if (!window || window.isDestroyed()) return
    +  setAndPersistZoomLevel(window, percentToZoomLevel(Number(percent)))
    +})
    +
     // --- Pet overlay (pop-out mascot) -----------------------------------------
     // `request` is `{ bounds, screen }`. A fresh pop-out passes viewport-space
     // bounds (screen=false): convert to screen space by adding the main window's

  • apps/desktop/electron/preload.cjs

    @@ -78,6 +78,18 @@ contextBridge.exposeInMainWorld('hermesDesktop', {
         setDefaultProjectDir: dir => ipcRenderer.invoke('hermes:setting:defaultProjectDir:set', dir),
         pickDefaultProjectDir: () => ipcRenderer.invoke('hermes:setting:defaultProjectDir:pick')
       },
    +  zoom: {
    +    // Current zoom of this window, as { level, percent }.
    +    get: () => ipcRenderer.invoke('hermes:zoom:get'),
    +    setPercent: percent => ipcRenderer.send('hermes:zoom:set-percent', percent),
    +    // Fires on every zoom change, including the Ctrl/Cmd +/-/0 shortcuts,
    +    // so the settings UI can stay in sync with the keyboard.
    +    onChanged: callback => {
    +      const listener = (_event, payload) => callback(payload)
    +      ipcRenderer.on('hermes:zoom:changed', listener)
    +      return () => ipcRenderer.removeListener('hermes:zoom:changed', listener)
    +    }
    +  },
       revealLogs: () => ipcRenderer.invoke('hermes:logs:reveal'),
       getRecentLogs: () => ipcRenderer.invoke('hermes:logs:recent'),
       readDir: dirPath => ipcRenderer.invoke('hermes:fs:readDir', dirPath),

  • apps/desktop/electron/zoom.cjs

    @@ -0,0 +1,34 @@
    +/**
    + * Pure helpers for window zoom. The main process owns webContents.setZoomLevel,
    + * so the menu items, the Ctrl/Cmd shortcuts, and the settings UI all funnel
    + * through this one clamped scale. Percent is the user-facing unit (100 = the
    + * default size); Chromium's internal unit is the zoom level, where
    + * factor = 1.2 ^ level.
    + */
    +
    +const ZOOM_STORAGE_KEY = 'hermes:desktop:zoomLevel'
    +
    +const ZOOM_FACTOR_BASE = 1.2
    +const MIN_ZOOM_LEVEL = -9
    +const MAX_ZOOM_LEVEL = 9
    +
    +function clampZoomLevel(value) {
    +  if (!Number.isFinite(value)) return 0
    +  return Math.min(Math.max(value, MIN_ZOOM_LEVEL), MAX_ZOOM_LEVEL)
    +}
    +
    +function zoomLevelToPercent(level) {
    +  return Math.round(Math.pow(ZOOM_FACTOR_BASE, clampZoomLevel(level)) * 100)
    +}
    +
    +function percentToZoomLevel(percent) {
    +  if (!Number.isFinite(percent) || percent <= 0) return 0
    +  return clampZoomLevel(Math.log(percent / 100) / Math.log(ZOOM_FACTOR_BASE))
    +}
    +
    +module.exports = {
    +  ZOOM_STORAGE_KEY,
    +  clampZoomLevel,
    +  percentToZoomLevel,
    +  zoomLevelToPercent
    +}

  • apps/desktop/electron/zoom.test.cjs

    @@ -0,0 +1,54 @@
    +/**
    + * Unit tests for the pure zoom helpers: clamping garbage input, the
    + * percent <-> zoom-level conversion the settings UI relies on, and the
    + * roundtrip stability of the preset percentages.
    + */
    +
    +const test = require('node:test')
    +const assert = require('node:assert/strict')
    +
    +const { ZOOM_STORAGE_KEY, clampZoomLevel, percentToZoomLevel, zoomLevelToPercent } = require('./zoom.cjs')
    +
    +test('storage key stays stable so persisted zoom survives upgrades', () => {
    +  assert.equal(ZOOM_STORAGE_KEY, 'hermes:desktop:zoomLevel')
    +})
    +
    +test('clampZoomLevel rejects garbage and enforces bounds', () => {
    +  assert.equal(clampZoomLevel(NaN), 0)
    +  assert.equal(clampZoomLevel(Infinity), 0)
    +  assert.equal(clampZoomLevel(undefined), 0)
    +  assert.equal(clampZoomLevel('2'), 0)
    +  assert.equal(clampZoomLevel(0.3), 0.3)
    +  assert.equal(clampZoomLevel(-42), -9)
    +  assert.equal(clampZoomLevel(42), 9)
    +})
    +
    +test('level 0 is exactly 100 percent', () => {
    +  assert.equal(zoomLevelToPercent(0), 100)
    +  assert.equal(percentToZoomLevel(100), 0)
    +})
    +
    +test('percentToZoomLevel rejects garbage', () => {
    +  assert.equal(percentToZoomLevel(NaN), 0)
    +  assert.equal(percentToZoomLevel(0), 0)
    +  assert.equal(percentToZoomLevel(-50), 0)
    +  assert.equal(percentToZoomLevel(undefined), 0)
    +})
    +
    +test('preset percentages roundtrip within rounding', () => {
    +  for (const percent of [90, 100, 110, 125, 150, 175]) {
    +    assert.equal(zoomLevelToPercent(percentToZoomLevel(percent)), percent)
    +  }
    +})
    +
    +test('conversion is monotonic across the preset range', () => {
    +  const levels = [90, 100, 110, 125, 150, 175].map(percentToZoomLevel)
    +  for (let i = 1; i < levels.length; i++) {
    +    assert.ok(levels[i] > levels[i - 1])
    +  }
    +})
    +
    +test('extreme percentages clamp to the level bounds', () => {
    +  assert.equal(percentToZoomLevel(1), -9)
    +  assert.equal(percentToZoomLevel(1_000_000), 9)
    +})

  • apps/desktop/package.json

    @@ -37,7 +37,7 @@
         "test:desktop:nsis": "node scripts/test-desktop.mjs nsis",
         "test:desktop:existing": "node scripts/test-desktop.mjs existing",
         "test:desktop:fresh": "node scripts/test-desktop.mjs fresh",
    -    "test:desktop:platforms": "node --test electron/bootstrap-platform.test.cjs electron/hardening.test.cjs electron/backend-env.test.cjs electron/backend-probes.test.cjs electron/backend-ready.test.cjs electron/bootstrap-runner.test.cjs electron/connection-config.test.cjs electron/dashboard-token.test.cjs electron/gateway-ws-probe.test.cjs electron/oauth-net-request.test.cjs electron/desktop-uninstall.test.cjs electron/session-windows.test.cjs electron/link-title-window.test.cjs electron/workspace-cwd.test.cjs electron/fs-read-dir.test.cjs electron/git-root.test.cjs electron/git-worktree-ops.test.cjs electron/windows-child-process.test.cjs electron/update-remote.test.cjs electron/update-count.test.cjs electron/update-rebuild.test.cjs electron/update-marker.test.cjs electron/update-relaunch.test.cjs electron/windows-user-env.test.cjs electron/wsl-clipboard-image.test.cjs electron/titlebar-overlay-width.test.cjs electron/window-state.test.cjs electron/windows-hermes-resolution.test.cjs electron/oauth-session-request.test.cjs",
    +    "test:desktop:platforms": "node --test electron/bootstrap-platform.test.cjs electron/hardening.test.cjs electron/backend-env.test.cjs electron/backend-probes.test.cjs electron/backend-ready.test.cjs electron/bootstrap-runner.test.cjs electron/connection-config.test.cjs electron/dashboard-token.test.cjs electron/gateway-ws-probe.test.cjs electron/oauth-net-request.test.cjs electron/desktop-uninstall.test.cjs electron/session-windows.test.cjs electron/link-title-window.test.cjs electron/workspace-cwd.test.cjs electron/fs-read-dir.test.cjs electron/git-root.test.cjs electron/git-worktree-ops.test.cjs electron/windows-child-process.test.cjs electron/update-remote.test.cjs electron/update-count.test.cjs electron/update-rebuild.test.cjs electron/update-marker.test.cjs electron/update-relaunch.test.cjs electron/windows-user-env.test.cjs electron/wsl-clipboard-image.test.cjs electron/titlebar-overlay-width.test.cjs electron/window-state.test.cjs electron/zoom.test.cjs electron/windows-hermes-resolution.test.cjs electron/oauth-session-request.test.cjs",
         "typecheck": "tsc -p . --noEmit",
         "lint": "eslint src/ electron/",
         "lint:fix": "eslint src/ electron/ --fix",

  • apps/desktop/src/app/settings/appearance-settings.tsx

    @@ -16,6 +16,7 @@ import { $embedAllowed, $embedMode, clearEmbedAllowed, type EmbedMode, setEmbedM
     import { $activeGatewayProfile, $profiles, normalizeProfileKey } from '@/store/profile'
     import { $toolViewMode, setToolViewMode } from '@/store/tool-view'
     import { $translucency, setTranslucency } from '@/store/translucency'
    +import { $zoomPercent, setZoomPercent } from '@/store/zoom'
     import { getBaseColors, useTheme } from '@/themes/context'
     import { installVscodeThemeFromMarketplace } from '@/themes/install'
     import type { DesktopTheme } from '@/themes/types'
    @@ -62,6 +63,18 @@ function ThemePreview({ name, mode }: { name: string; mode: 'light' | 'dark' })
       )
     }
     
    +// UI scale presets, as zoom percentages. 100 is the browser-default size;
    +// the ids double as the percent values sent to the main process. A Cmd/Ctrl
    +// +/- step landing between presets highlights nothing, and the row
    +// description keeps showing the exact current percent.
    +const UI_SCALE_PRESETS = ['90', '100', '110', '125', '150', '175'] as const
    +
    +type UiScalePreset = (typeof UI_SCALE_PRESETS)[number]
    +
    +function matchUiScalePreset(percent: number): UiScalePreset | null {
    +  return UI_SCALE_PRESETS.find(preset => Number(preset) === percent) ?? null
    +}
    +
     function useDebounced<T>(value: T, delayMs: number): T {
       const [debounced, setDebounced] = useState(value)
     
    @@ -231,6 +244,7 @@ export function AppearanceSettings() {
       const { t, isSavingLocale } = useI18n()
       const { themeName, mode, resolvedMode, availableThemes, setTheme, setMode } = useTheme()
       const toolViewMode = useStore($toolViewMode)
    +  const zoomPercent = useStore($zoomPercent)
       const embedMode = useStore($embedMode)
       const embedAllowed = useStore($embedAllowed)
       const translucency = useStore($translucency)
    @@ -277,6 +291,10 @@ export function AppearanceSettings() {
         { id: 'off', label: a.embedsOff }
       ] as const satisfies readonly { id: EmbedMode; label: string }[]
     
    +  const uiScaleOptions = UI_SCALE_PRESETS.map(preset => ({ id: preset, label: `${preset}%` }))
    +
    +  const matchedScalePreset = matchUiScalePreset(zoomPercent)
    +
       return (
         <SettingsContent>
           <div>
    @@ -392,6 +410,21 @@ export function AppearanceSettings() {
                 wide
               />
     
    +          <ListRow
    +            action={
    +              <SegmentedControl
    +                onChange={id => {
    +                  triggerHaptic('selection')
    +                  setZoomPercent(Number(id))
    +                }}
    +                options={uiScaleOptions}
    +                value={matchedScalePreset ?? ('' as UiScalePreset)}
    +              />
    +            }
    +            description={a.uiScaleDesc(zoomPercent)}
    +            title={a.uiScaleTitle}
    +          />
    +
               <ListRow
                 action={
                   <div className="flex items-center gap-3">

  • apps/desktop/src/global.d.ts

    @@ -89,6 +89,11 @@ declare global {
             pickDefaultProjectDir: () => Promise<{ canceled: boolean; dir: null | string }>
             setDefaultProjectDir: (dir: null | string) => Promise<{ dir: null | string }>
           }
    +      zoom?: {
    +        get: () => Promise<{ level: number; percent: number }>
    +        setPercent: (percent: number) => void
    +        onChanged: (callback: (payload: { level: number; percent: number }) => void) => () => void
    +      }
           revealLogs: () => Promise<{ ok: boolean; path: string; error?: string }>
           getRecentLogs: () => Promise<{ path: string; lines: string[] }>
           readDir: (path: string) => Promise<HermesReadDirResult>

  • apps/desktop/src/i18n/en.ts

    @@ -381,6 +381,9 @@ export const en: Translations = {
           colorModeDesc: 'Pick a fixed mode or let Hermes follow your system setting.',
           toolViewTitle: 'Tool Call Display',
           toolViewDesc: 'Product hides raw tool payloads; Technical shows full input/output.',
    +      uiScaleTitle: 'UI Scale',
    +      uiScaleDesc: (percent: number) =>
    +        `Scales text and controls across the whole app. Cmd/Ctrl with +, - and 0 also works. Current: ${percent}%.`,
           translucencyTitle: 'Window Translucency',
           translucencyDesc: 'See your desktop through the whole window. macOS and Windows only.',
           embedsTitle: 'Inline Embeds',

  • apps/desktop/src/i18n/ja.ts

    @@ -287,6 +287,9 @@ export const ja = defineLocale({
           colorModeDesc: '固定モードを選ぶか、Hermes をシステム設定に合わせます。',
           toolViewTitle: 'ツール呼び出しの表示',
           toolViewDesc: 'プロダクト表示は生のツールペイロードを隠し、テクニカル表示は入出力をすべて表示します。',
    +      uiScaleTitle: 'UI スケール',
    +      uiScaleDesc: (percent: number) =>
    +        `アプリ全体の文字と UI を拡大縮小します。Cmd/Ctrl と +、-、0 でも変更できます。現在: ${percent}%`,
           translucencyTitle: 'ウィンドウの透過',
           translucencyDesc: 'ウィンドウ全体を透過させてデスクトップを表示します。macOS と Windows のみ。',
           embedsTitle: 'インライン埋め込み',

  • apps/desktop/src/i18n/types.ts

    @@ -302,6 +302,8 @@ export interface Translations {
           colorModeDesc: string
           toolViewTitle: string
           toolViewDesc: string
    +      uiScaleTitle: string
    +      uiScaleDesc: (percent: number) => string
           translucencyTitle: string
           translucencyDesc: string
           embedsTitle: string

  • apps/desktop/src/i18n/zh-hant.ts

    @@ -279,6 +279,8 @@ export const zhHant = defineLocale({
           colorModeDesc: '選擇固定模式，或讓 Hermes 跟隨系統設定。',
           toolViewTitle: '工具呼叫顯示',
           toolViewDesc: '產品模式會隱藏原始工具 payload；技術模式會顯示完整輸入/輸出。',
    +      uiScaleTitle: '介面縮放',
    +      uiScaleDesc: (percent: number) => `縮放整個應用程式的文字與介面。也可使用 Cmd/Ctrl 加 +、- 或 0 調整。目前：${percent}%`,
           translucencyTitle: '視窗透明',
           translucencyDesc: '讓整個視窗透出桌面。僅支援 macOS 與 Windows。',
           embedsTitle: '內嵌預覽',

  • apps/desktop/src/i18n/zh.ts

    @@ -370,6 +370,8 @@ export const zh: Translations = {
           colorModeDesc: '选择固定模式，或让 Hermes 跟随系统设置。',
           toolViewTitle: '工具调用显示',
           toolViewDesc: '产品模式隐藏原始工具数据；技术模式显示完整输入/输出。',
    +      uiScaleTitle: '界面缩放',
    +      uiScaleDesc: (percent: number) => `缩放整个应用的文字和界面。也可使用 Cmd/Ctrl 加 +、- 或 0 调整。当前：${percent}%`,
           translucencyTitle: '窗口透明',
           translucencyDesc: '让整个窗口透出桌面。仅支持 macOS 和 Windows。',
           embedsTitle: '内嵌预览',

  • apps/desktop/src/store/zoom.ts

    @@ -0,0 +1,22 @@
    +/**
    + * Window text size (zoom).
    + *
    + * The main process owns the zoom level and persists it (see electron/zoom.cjs
    + * for the scale). The renderer only mirrors the current percent for the
    + * settings UI: preset clicks go to the main process over IPC, and every
    + * change comes back through onChanged, including ones made with the
    + * Ctrl/Cmd +/-/0 shortcuts or the View menu, so the UI never drifts.
    + */
    +
    +import { atom } from 'nanostores'
    +
    +export const $zoomPercent = atom<number>(100)
    +
    +export function setZoomPercent(percent: number): void {
    +  window.hermesDesktop?.zoom?.setPercent(percent)
    +}
    +
    +if (typeof window !== 'undefined' && window.hermesDesktop?.zoom) {
    +  void window.hermesDesktop.zoom.get().then(({ percent }) => $zoomPercent.set(percent))
    +  window.hermesDesktop.zoom.onChanged(({ percent }) => $zoomPercent.set(percent))
    +}