mirror of
https://github.com/NousResearch/hermes-agent.git
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bcf0d74572
Reassert the persisted webContents zoom after BrowserWindow moved, covering Windows monitor transitions where Chromium recalculates display scaling and drops the user-selected zoom.
87 lines
2.8 KiB
TypeScript
87 lines
2.8 KiB
TypeScript
/**
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* Pure helpers for window zoom. The main process owns webContents.setZoomLevel,
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* so the menu items, the Ctrl/Cmd shortcuts, and the settings UI all funnel
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* through this one clamped scale. Percent is the user-facing unit (100 = the
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* default size); Chromium's internal unit is the zoom level, where
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* factor = 1.2 ^ level.
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*/
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export const ZOOM_STORAGE_KEY = 'hermes:desktop:zoomLevel'
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const ZOOM_FACTOR_BASE = 1.2
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const MIN_ZOOM_LEVEL = -9
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const MAX_ZOOM_LEVEL = 9
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export function clampZoomLevel(value) {
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if (!Number.isFinite(value)) {
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return 0
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}
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return Math.min(Math.max(value, MIN_ZOOM_LEVEL), MAX_ZOOM_LEVEL)
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}
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export function zoomLevelToPercent(level) {
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return Math.round(Math.pow(ZOOM_FACTOR_BASE, clampZoomLevel(level)) * 100)
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}
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export function percentToZoomLevel(percent) {
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if (!Number.isFinite(percent) || percent <= 0) {
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return 0
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}
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return clampZoomLevel(Math.log(percent / 100) / Math.log(ZOOM_FACTOR_BASE))
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}
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/**
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* Apply a clamped zoom level to a webContents AND notify the renderer, in that
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* order. Every path that changes zoom (user action, restore-on-load, lifecycle
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* re-assert) funnels through here so the settings UI Scale control can never
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* drift from the actually-applied level — the bug where restore set the level
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* but forgot to emit 'hermes:zoom:changed', leaving the control stuck at 100%.
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* Returns the clamped level so callers can persist it.
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*/
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export function applyZoomLevel(webContents, level) {
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const clamped = clampZoomLevel(level)
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webContents.setZoomLevel(clamped)
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webContents.send('hermes:zoom:changed', { level: clamped, percent: zoomLevelToPercent(clamped) })
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return clamped
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}
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// Chromium on Windows can drop webContents zoom when a BrowserWindow is minimized
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// and restored or crosses onto a monitor with different display scaling. Re-apply
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// the persisted level after each completed lifecycle transition.
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export const ZOOM_REASSERT_WINDOW_EVENTS = ['show', 'restore', 'moved']
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export function installZoomReassertOnWindowEvents(win, reassert) {
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if (!win?.on) {
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return
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}
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for (const event of ZOOM_REASSERT_WINDOW_EVENTS) {
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win.on(event, () => {
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if (win.isDestroyed?.()) {
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return
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}
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reassert()
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})
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}
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}
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/**
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* Zoom-wiring decision per window kind. Chat windows (main + session) keep
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* global UI zoom; the pet overlay opts out because it sizes its own OS window
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* to the sprite and inheriting zoom would crop it.
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*
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* Extracted so the "pet opts out, everything else opts in" contract is
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* unit-testable without booting a BrowserWindow or reading source.
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*/
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export const ZOOM_WINDOW_CONFIG = {
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chat: { zoom: true },
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petOverlay: { zoom: false }
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} as const
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export function zoomWiringForWindowKind(kind) {
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return ZOOM_WINDOW_CONFIG[kind] ?? ZOOM_WINDOW_CONFIG.chat
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}
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