53 lines
1.6 KiB
Swift
53 lines
1.6 KiB
Swift
import AppKit
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/// Keeps SwiftUI, native controls, and terminal surfaces on one inherited appearance.
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@MainActor
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final class AppAppearanceController {
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private let defaults: UserDefaults
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private let notifications: NotificationCenter
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private let apply: (NSAppearance?) -> Void
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private var observer: (any NSObjectProtocol)?
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private var appliedAppearance: AppAppearance?
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init(
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defaults: UserDefaults = .standard,
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notifications: NotificationCenter = .default,
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apply: @escaping (NSAppearance?) -> Void = { NSApp.appearance = $0 }
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) {
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self.defaults = defaults
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self.notifications = notifications
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self.apply = apply
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}
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isolated deinit {
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if let observer { notifications.removeObserver(observer) }
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}
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func start() {
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guard observer == nil else { return }
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observer = notifications.addObserver(
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forName: UserDefaults.didChangeNotification, object: defaults, queue: .main
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) { [weak self] _ in
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MainActor.assumeIsolated { self?.refresh() }
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}
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refresh()
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}
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func stop() {
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if let observer { notifications.removeObserver(observer) }
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observer = nil
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appliedAppearance = nil
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}
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private func refresh() {
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let selection = AppAppearance.stored(in: defaults)
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guard selection != appliedAppearance else { return }
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appliedAppearance = selection
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switch selection {
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case .system: apply(nil)
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case .light: apply(NSAppearance(named: .aqua))
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case .dark: apply(NSAppearance(named: .darkAqua))
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}
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}
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}
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