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webview (macOS): App Nap exemption so background/occluded UIs stay live #4

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webview (macOS): App Nap exemption so background/occluded UIs stay live #4

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23 changes: 23 additions & 0 deletions glaze/webview/webview-macos.rkt
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,7 @@

(import-class NSString NSNull
NSApplication
NSProcessInfo
NSMenu
NSMenuItem
NSWindow
Expand Down Expand Up @@ -306,6 +307,27 @@
;; Standard menus install once; re-running install-standard-menus! would
;; replace the main menu and wipe any custom menus set-menu! appended.
(define standard-menus-installed? #f)
(define app-nap-disabled? #f)

;; App Nap exemption. macOS throttles/suspends "idle" apps whose windows are
;; fully occluded, which freezes monitoring-style Glaze UIs (live charts,
;; log tails, streaming views) the moment another window covers them. Decla-
;; ring user-initiated activity for the process lifetime keeps the WebView
;; live in the background; a Glaze app with an open window IS user-initiated
;; work, so the token is intentionally never ended. Options value:
;; NSActivityUserInitiated = 0x00FFFFFF (mask includes the IdleSystemSleep
;; bit; per NSProcessInfo.h).
(define (disable-app-nap!)
(unless app-nap-disabled?
(set! app-nap-disabled? #t)
(with-handlers ([exn:fail? (lambda (_) (void))])
(define pi (tell NSProcessInfo processInfo))
(define token
(tell #:type _id pi beginActivityWithOptions: #:type _uint64 16777215
reason: #:type _id (->nsstring "Glaze UI running")))
;; token kept forever; no endActivity counterpart by design
(void token))))

(define (ensure-app!)
(call-with-semaphore
app-init-sema
Expand All @@ -315,6 +337,7 @@
(unless standard-menus-installed?
(install-standard-menus! app)
(set! standard-menus-installed? #t))
(disable-app-nap!)
;; macOS 14+ deprecates activateIgnoringOtherApps: in favor of -activate.
(if (tell app respondsToSelector: #:type _SEL (selector activate))
(tellv app activate)
Expand Down
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