wehub-resource-sync
79 lines
2.5 KiB
Swift
79 lines
2.5 KiB
Swift
import AppKit
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import Foundation
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@MainActor
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protocol DisplayConfigurationObserving: AnyObject {
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var onConfigurationChange: (() -> Void)? { get set }
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}
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@MainActor
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final class SystemDisplayConfigurationObserver: DisplayConfigurationObserving {
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var onConfigurationChange: (() -> Void)?
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private let notificationCenter: NotificationCenter
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private var screenParametersObserver: NSObjectProtocol?
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private var isRegisteredForCGDisplayChanges = false
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init(notificationCenter: NotificationCenter = .default) {
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self.notificationCenter = notificationCenter
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screenParametersObserver = notificationCenter.addObserver(
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forName: NSApplication.didChangeScreenParametersNotification,
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object: nil,
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queue: .main
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) { [weak self] _ in
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Task { @MainActor in
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self?.onConfigurationChange?()
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}
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}
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let registrationError = CGDisplayRegisterReconfigurationCallback(
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Self.displayReconfigurationCallback,
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Unmanaged.passUnretained(self).toOpaque()
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)
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if registrationError == .success {
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isRegisteredForCGDisplayChanges = true
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} else {
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AppLog.displayConfigurationObserver.error(
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"failed to register display reconfiguration callback: \(registrationError.rawValue)"
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)
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}
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}
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deinit {
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MainActor.assumeIsolated {
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if isRegisteredForCGDisplayChanges {
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CGDisplayRemoveReconfigurationCallback(
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Self.displayReconfigurationCallback,
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Unmanaged.passUnretained(self).toOpaque()
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)
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}
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if let screenParametersObserver {
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notificationCenter.removeObserver(screenParametersObserver)
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}
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}
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}
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nonisolated private static let displayReconfigurationCallback: CGDisplayReconfigurationCallBack = {
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_, flags, userInfo in
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guard
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flags.contains(.addFlag)
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|| flags.contains(.removeFlag)
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|| flags.contains(.setModeFlag)
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|| flags.contains(.enabledFlag)
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|| flags.contains(.disabledFlag),
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let userInfo
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else {
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return
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}
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let observer = Unmanaged<SystemDisplayConfigurationObserver>
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.fromOpaque(userInfo)
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.takeUnretainedValue()
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Task { @MainActor [weak observer] in
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observer?.onConfigurationChange?()
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}
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}
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}
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