/*

* Copyright (C) 2015 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.

*/

#pragma once

#if PLATFORM(IOS_FAMILY)

#import <wtf/Forward.h>

#import <wtf/RefCountedAndCanMakeWeakPtr.h>

#import <wtf/TZoneMalloc.h>

#import <wtf/WeakObjCPtr.h>

#import <wtf/WeakPtr.h>

OBJC_CLASS BKSApplicationStateMonitor;

OBJC_CLASS UIView;

OBJC_CLASS UIViewController;

OBJC_CLASS UIWindow;

OBJC_CLASS UIScene;

OBJC_CLASS WKUIWindowSceneObserver;

namespace WebKit {

enum class ApplicationType : uint8_t {

Application,

ViewService,

Extension,

};

class ApplicationStateTracker : public RefCountedAndCanMakeWeakPtr<ApplicationStateTracker> {

WTF_MAKE_TZONE_ALLOCATED(ApplicationStateTracker);

public:

static RefPtr<ApplicationStateTracker> create(UIView *view, SEL didEnterBackgroundSelector, SEL willEnterForegroundSelector, SEL willBeginSnapshotSequenceSelector, SEL didCompleteSnapshotSequenceSelector)

{

return adoptRef(new ApplicationStateTracker(view, didEnterBackgroundSelector, willEnterForegroundSelector, willBeginSnapshotSequenceSelector, didCompleteSnapshotSequenceSelector));

}

~ApplicationStateTracker();

bool isInBackground() const { return m_isInBackground; }

void setWindow(UIWindow *);

void setScene(UIScene *);

private:

ApplicationStateTracker(UIView *, SEL didEnterBackgroundSelector, SEL willEnterForegroundSelector, SEL willBeginSnapshotSequenceSelector, SEL didCompleteSnapshotSequenceSelector);

void setViewController(UIViewController *);

void setIsInBackground(bool);

void applicationDidEnterBackground();

void applicationDidFinishSnapshottingAfterEnteringBackground();

void applicationWillEnterForeground();

void willBeginSnapshotSequence();

void didCompleteSnapshotSequence();

void removeAllObservers();

WeakObjCPtr<UIView> m_view;

WeakObjCPtr<UIWindow> m_window;

WeakObjCPtr<UIScene> m_scene;

WeakObjCPtr<UIViewController> m_viewController;

RetainPtr<WKUIWindowSceneObserver> m_observer;

ApplicationType m_applicationType { ApplicationType::Application };

SEL m_didEnterBackgroundSelector;

SEL m_willEnterForegroundSelector;

SEL m_willBeginSnapshotSequenceSelector;

SEL m_didCompleteSnapshotSequenceSelector;

bool m_isInBackground;

WeakObjCPtr<NSObject> m_didEnterBackgroundObserver;

WeakObjCPtr<NSObject> m_willEnterForegroundObserver;

WeakObjCPtr<NSObject> m_willBeginSnapshotSequenceObserver;

WeakObjCPtr<NSObject> m_didCompleteSnapshotSequenceObserver;

};

ApplicationType applicationType(UIWindow *);

}

#endif