Source/WebKit/Shared/UserInterfaceIdiom.mm

/*
* Copyright (C) 2019-2021 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
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* 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
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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*/

#import "config.h"
#import "UserInterfaceIdiom.h"

#if PLATFORM(IOS_FAMILY)

#import "UIKitSPI.h"
#import <WebCore/Device.h>
#import <wtf/TriState.h>

namespace WebKit {

static TriState idiomIsSmallScreen = TriState::Indeterminate;

bool currentUserInterfaceIdiomIsSmallScreen()
{
    if (idiomIsSmallScreen == TriState::Indeterminate)
        updateCurrentUserInterfaceIdiom();
    return idiomIsSmallScreen == TriState::True;
}

void setCurrentUserInterfaceIdiomIsSmallScreen(bool isSmallScreen)
{
    idiomIsSmallScreen = TriState(isSmallScreen);
}

bool updateCurrentUserInterfaceIdiom()
{
    bool wasSmallScreen = idiomIsSmallScreen == TriState::True;

    // If we are in a daemon, we cannot use UIDevice. Fall back to checking the hardware itself.
    // Since daemons don't ever run in an iPhone-app-on-iPad jail, this will be accurate in the daemon case,
    // but is not sufficient in the application case.
    bool isSmallScreen;
    if (![UIApplication sharedApplication])
        isSmallScreen = WebCore::deviceClassIsSmallScreen();
    else {
        auto idiom = [[UIDevice currentDevice] userInterfaceIdiom];
        isSmallScreen = idiom == UIUserInterfaceIdiomPhone || idiom == UIUserInterfaceIdiomWatch;
    }

    if (wasSmallScreen == isSmallScreen)
        return false;

    setCurrentUserInterfaceIdiomIsSmallScreen(isSmallScreen);
    return true;
}

}

#endif