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// Copyright (C) 2025 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
#if HAVE_MOUSE_DEVICE_OBSERVATION
@_weakLinked internal import GameController
internal import WebKit_Internal
@objc @implementation extension WKMouseDeviceObserver {
private static let shared = WKMouseDeviceObserver()
@nonobjc private var connectionObservationTask: Task<Void, Never>? = nil
@nonobjc private var disconnectionObservationTask: Task<Void, Never>? = nil
private var startCount = 0
private var connectedDeviceCount = 0 {
didSet {
precondition(connectedDeviceCount >= 0)
if oldValue == 0 && connectedDeviceCount > 0 {
mousePointerDevicesDidChange(true)
return
}
if oldValue > 0 && connectedDeviceCount == 0 {
mousePointerDevicesDidChange(false)
}
}
}
var hasMouseDevice: Bool {
connectedDeviceCount > 0
}
override init() {
}
class func sharedInstance() -> WKMouseDeviceObserver {
shared
}
func start() {
guard #_hasSymbol(GCMouse.self) else {
return
}
precondition(startCount >= 0)
startCount += 1
guard startCount == 1 else {
return
}
connectionObservationTask = Task {
let connectSequence = NotificationCenter.default.notifications(named: .GCMouseDidConnect).map { $0.object is GCMouse }
for await _ in connectSequence {
connectedDeviceCount = GCMouse.mice().count
}
}
disconnectionObservationTask = Task {
let disconnectSequence = NotificationCenter.default.notifications(named: .GCMouseDidDisconnect).map { $0.object is GCMouse }
for await _ in disconnectSequence {
connectedDeviceCount = GCMouse.mice().count
}
}
}
func stop() {
guard startCount > 0 else {
return
}
startCount -= 1
guard startCount == 0 else {
return
}
connectionObservationTask?.cancel()
disconnectionObservationTask?.cancel()
}
func _setHasMouseDevice(forTesting hasMouseDevice: Bool) {
connectedDeviceCount = hasMouseDevice ? 1 : 0
}
}
#endif // HAVE_MOUSE_DEVICE_OBSERVATION
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