JUCE/modules/juce_gui_basics/native/juce_ios_UIViewComponentPeer.mm

/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#include "juce_mac_CGMetalLayerRenderer.h"

#if TARGET_OS_SIMULATOR && JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS
 #warning JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS uses parts of the Metal API that are currently unsupported in the simulator - falling back to JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS=0
 #undef JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS
#endif

#if defined (__IPHONE_13_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_13_0
 #define JUCE_HAS_IOS_POINTER_SUPPORT 1
#else
 #define JUCE_HAS_IOS_POINTER_SUPPORT 0
#endif

namespace juce
{

class UIViewComponentPeer;

static UIInterfaceOrientation getWindowOrientation()
{
    UIApplication* sharedApplication = [UIApplication sharedApplication];

   #if defined (__IPHONE_13_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_13_0
    if (@available (iOS 13.0, *))
    {
        for (UIScene* scene in [sharedApplication connectedScenes])
            if ([scene isKindOfClass: [UIWindowScene class]])
                return [(UIWindowScene*) scene interfaceOrientation];
    }
   #endif

    JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wdeprecated-declarations")
    return [sharedApplication statusBarOrientation];
    JUCE_END_IGNORE_WARNINGS_GCC_LIKE
}

namespace Orientations
{
    static Desktop::DisplayOrientation convertToJuce (UIInterfaceOrientation orientation)
    {
        switch (orientation)
        {
            case UIInterfaceOrientationPortrait:            return Desktop::upright;
            case UIInterfaceOrientationPortraitUpsideDown:  return Desktop::upsideDown;
            case UIInterfaceOrientationLandscapeLeft:       return Desktop::rotatedClockwise;
            case UIInterfaceOrientationLandscapeRight:      return Desktop::rotatedAntiClockwise;
            case UIInterfaceOrientationUnknown:
            default:                                        jassertfalse; // unknown orientation!
        }

        return Desktop::upright;
    }

    static UIInterfaceOrientation convertFromJuce (Desktop::DisplayOrientation orientation)
    {
        switch (orientation)
        {
            case Desktop::upright:                          return UIInterfaceOrientationPortrait;
            case Desktop::upsideDown:                       return UIInterfaceOrientationPortraitUpsideDown;
            case Desktop::rotatedClockwise:                 return UIInterfaceOrientationLandscapeLeft;
            case Desktop::rotatedAntiClockwise:             return UIInterfaceOrientationLandscapeRight;
            case Desktop::allOrientations:
            default:                                        jassertfalse; // unknown orientation!
        }

        return UIInterfaceOrientationPortrait;
    }


    static NSUInteger getSupportedOrientations()
    {
        NSUInteger allowed = 0;
        auto& d = Desktop::getInstance();

        if (d.isOrientationEnabled (Desktop::upright))              allowed |= UIInterfaceOrientationMaskPortrait;
        if (d.isOrientationEnabled (Desktop::upsideDown))           allowed |= UIInterfaceOrientationMaskPortraitUpsideDown;
        if (d.isOrientationEnabled (Desktop::rotatedClockwise))     allowed |= UIInterfaceOrientationMaskLandscapeLeft;
        if (d.isOrientationEnabled (Desktop::rotatedAntiClockwise)) allowed |= UIInterfaceOrientationMaskLandscapeRight;

        return allowed;
    }
}

enum class MouseEventFlags
{
    none,
    down,
    up,
    upAndCancel,
};

//==============================================================================
} // namespace juce

using namespace juce;

struct CADisplayLinkDeleter
{
    void operator() (CADisplayLink* displayLink) const noexcept
    {
        [displayLink invalidate];
        [displayLink release];
    }
};

@interface JuceUIView : UIView <UITextViewDelegate>
{
@public
    UIViewComponentPeer* owner;
    UITextView* hiddenTextView;
    std::unique_ptr<CADisplayLink, CADisplayLinkDeleter> displayLink;
}

- (JuceUIView*) initWithOwner: (UIViewComponentPeer*) owner withFrame: (CGRect) frame;
- (void) dealloc;

+ (Class) layerClass;

- (void) displayLinkCallback: (CADisplayLink*) dl;

- (void) drawRect: (CGRect) r;

- (void) touchesBegan:     (NSSet*) touches  withEvent: (UIEvent*) event;
- (void) touchesMoved:     (NSSet*) touches  withEvent: (UIEvent*) event;
- (void) touchesEnded:     (NSSet*) touches  withEvent: (UIEvent*) event;
- (void) touchesCancelled: (NSSet*) touches  withEvent: (UIEvent*) event;

#if JUCE_HAS_IOS_POINTER_SUPPORT
- (void) onHover: (UIHoverGestureRecognizer*) gesture API_AVAILABLE (ios (13.0));
- (void) onScroll: (UIPanGestureRecognizer*) gesture;
#endif

- (BOOL) becomeFirstResponder;
- (BOOL) resignFirstResponder;
- (BOOL) canBecomeFirstResponder;

- (BOOL) textView: (UITextView*) textView shouldChangeTextInRange: (NSRange) range replacementText: (NSString*) text;

- (void) traitCollectionDidChange: (UITraitCollection*) previousTraitCollection;

- (BOOL) isAccessibilityElement;
- (CGRect) accessibilityFrame;
- (NSArray*) accessibilityElements;
@end

//==============================================================================
@interface JuceUIViewController : UIViewController
{
}

- (JuceUIViewController*) init;

- (NSUInteger) supportedInterfaceOrientations;
- (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation) interfaceOrientation;
- (void) willRotateToInterfaceOrientation: (UIInterfaceOrientation) toInterfaceOrientation duration: (NSTimeInterval) duration;
- (void) didRotateFromInterfaceOrientation: (UIInterfaceOrientation) fromInterfaceOrientation;
- (void) viewWillTransitionToSize: (CGSize) size withTransitionCoordinator: (id<UIViewControllerTransitionCoordinator>) coordinator;
- (BOOL) prefersStatusBarHidden;
- (UIStatusBarStyle) preferredStatusBarStyle;

- (void) viewDidLoad;
- (void) viewWillAppear: (BOOL) animated;
- (void) viewDidAppear: (BOOL) animated;
- (void) viewWillLayoutSubviews;
- (void) viewDidLayoutSubviews;
@end

//==============================================================================
@interface JuceUIWindow : UIWindow
{
@private
    UIViewComponentPeer* owner;
}

- (void) setOwner: (UIViewComponentPeer*) owner;
- (void) becomeKeyWindow;
@end

//==============================================================================
//==============================================================================
namespace juce
{

struct UIViewPeerControllerReceiver
{
    virtual ~UIViewPeerControllerReceiver() = default;
    virtual void setViewController (UIViewController*) = 0;
};

class UIViewComponentPeer  : public ComponentPeer,
                             private FocusChangeListener,
                             private UIViewPeerControllerReceiver
{
public:
    UIViewComponentPeer (Component&, int windowStyleFlags, UIView* viewToAttachTo);
    ~UIViewComponentPeer() override;

    //==============================================================================
    void* getNativeHandle() const override                  { return view; }
    void setVisible (bool shouldBeVisible) override;
    void setTitle (const String& title) override;
    void setBounds (const Rectangle<int>&, bool isNowFullScreen) override;

    void setViewController (UIViewController* newController) override
    {
        jassert (controller == nullptr);
        controller = [newController retain];
    }

    Rectangle<int> getBounds() const override                 { return getBounds (! isSharedWindow); }
    Rectangle<int> getBounds (bool global) const;
    Point<float> localToGlobal (Point<float> relativePosition) override;
    Point<float> globalToLocal (Point<float> screenPosition) override;
    using ComponentPeer::localToGlobal;
    using ComponentPeer::globalToLocal;
    void setAlpha (float newAlpha) override;
    void setMinimised (bool) override                         {}
    bool isMinimised() const override                         { return false; }
    void setFullScreen (bool shouldBeFullScreen) override;
    bool isFullScreen() const override                        { return fullScreen; }
    bool contains (Point<int> localPos, bool trueIfInAChildWindow) const override;
    OptionalBorderSize getFrameSizeIfPresent() const override { return {}; }
    BorderSize<int> getFrameSize() const override             { return BorderSize<int>(); }
    bool setAlwaysOnTop (bool alwaysOnTop) override;
    void toFront (bool makeActiveWindow) override;
    void toBehind (ComponentPeer* other) override;
    void setIcon (const Image& newIcon) override;
    StringArray getAvailableRenderingEngines() override       { return StringArray ("CoreGraphics Renderer"); }

    void displayLinkCallback();

    void drawRect (CGRect);
    void drawRectWithContext (CGContextRef, CGRect);
    bool canBecomeKeyWindow();

    //==============================================================================
    void viewFocusGain();
    void viewFocusLoss();
    bool isFocused() const override;
    void grabFocus() override;
    void textInputRequired (Point<int>, TextInputTarget&) override;

    BOOL textViewReplaceCharacters (Range<int>, const String&);
    void updateHiddenTextContent (TextInputTarget*);
    void globalFocusChanged (Component*) override;

    void updateScreenBounds();

    void handleTouches (UIEvent*, MouseEventFlags);

   #if JUCE_HAS_IOS_POINTER_SUPPORT
    API_AVAILABLE (ios (13.0)) void onHover (UIHoverGestureRecognizer*);
    void onScroll (UIPanGestureRecognizer*);
   #endif

    //==============================================================================
    void repaint (const Rectangle<int>& area) override;
    void performAnyPendingRepaintsNow() override;

    //==============================================================================
    UIWindow* window = nil;
    JuceUIView* view = nil;
    UIViewController* controller = nil;
    const bool isSharedWindow, isAppex;
    bool fullScreen = false, insideDrawRect = false;

    static int64 getMouseTime (NSTimeInterval timestamp) noexcept
    {
        return (Time::currentTimeMillis() - Time::getMillisecondCounter())
             + (int64) (timestamp * 1000.0);
    }

    static int64 getMouseTime (UIEvent* e) noexcept
    {
        return getMouseTime ([e timestamp]);
    }

    static NSString* getDarkModeNotificationName()
    {
        return @"ViewDarkModeChanged";
    }

    static MultiTouchMapper<UITouch*> currentTouches;

private:
    void appStyleChanged() override
    {
        [controller setNeedsStatusBarAppearanceUpdate];
    }

    //==============================================================================
    class AsyncRepaintMessage  : public CallbackMessage
    {
    public:
        UIViewComponentPeer* const peer;
        const Rectangle<int> rect;

        AsyncRepaintMessage (UIViewComponentPeer* const p, const Rectangle<int>& r)
            : peer (p), rect (r)
        {
        }

        void messageCallback() override
        {
            if (ComponentPeer::isValidPeer (peer))
                peer->repaint (rect);
        }
    };

    std::unique_ptr<CoreGraphicsMetalLayerRenderer> metalRenderer;
    RectangleList<float> deferredRepaints;

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (UIViewComponentPeer)
};

static UIViewComponentPeer* getViewPeer (JuceUIViewController* c)
{
    if (JuceUIView* juceView = (JuceUIView*) [c view])
        return juceView->owner;

    jassertfalse;
    return nullptr;
}

static void sendScreenBoundsUpdate (JuceUIViewController* c)
{
    if (auto* peer = getViewPeer (c))
        peer->updateScreenBounds();
}

static bool isKioskModeView (JuceUIViewController* c)
{
    if (auto* peer = getViewPeer (c))
        return Desktop::getInstance().getKioskModeComponent() == &(peer->getComponent());

    return false;
}

MultiTouchMapper<UITouch*> UIViewComponentPeer::currentTouches;

} // namespace juce

//==============================================================================
//==============================================================================
@implementation JuceUIViewController

- (JuceUIViewController*) init
{
    self = [super init];

    return self;
}

- (NSUInteger) supportedInterfaceOrientations
{
    return Orientations::getSupportedOrientations();
}

- (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation) interfaceOrientation
{
    return Desktop::getInstance().isOrientationEnabled (Orientations::convertToJuce (interfaceOrientation));
}

- (void) willRotateToInterfaceOrientation: (UIInterfaceOrientation) toInterfaceOrientation
                                 duration: (NSTimeInterval) duration
{
    ignoreUnused (toInterfaceOrientation, duration);

    [UIView setAnimationsEnabled: NO]; // disable this because it goes the wrong way and looks like crap.
}

- (void) didRotateFromInterfaceOrientation: (UIInterfaceOrientation) fromInterfaceOrientation
{
    ignoreUnused (fromInterfaceOrientation);
    sendScreenBoundsUpdate (self);
    [UIView setAnimationsEnabled: YES];
}

- (void) viewWillTransitionToSize: (CGSize) size withTransitionCoordinator: (id<UIViewControllerTransitionCoordinator>) coordinator
{
    [super viewWillTransitionToSize: size withTransitionCoordinator: coordinator];
    [coordinator animateAlongsideTransition: nil completion: ^void (id<UIViewControllerTransitionCoordinatorContext>)
    {
        sendScreenBoundsUpdate (self);
    }];
}

- (BOOL) prefersStatusBarHidden
{
    if (isKioskModeView (self))
        return true;

    return [[[NSBundle mainBundle] objectForInfoDictionaryKey: @"UIStatusBarHidden"] boolValue];
}

#if defined (__IPHONE_11_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_11_0
 - (BOOL) prefersHomeIndicatorAutoHidden
 {
     return isKioskModeView (self);
 }
#endif

- (UIStatusBarStyle) preferredStatusBarStyle
{
   #if defined (__IPHONE_13_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_13_0
    if (@available (iOS 13.0, *))
    {
        if (auto* peer = getViewPeer (self))
        {
            switch (peer->getAppStyle())
            {
                case ComponentPeer::Style::automatic:
                    return UIStatusBarStyleDefault;
                case ComponentPeer::Style::light:
                    return UIStatusBarStyleDarkContent;
                case ComponentPeer::Style::dark:
                    return UIStatusBarStyleLightContent;
            }
        }
    }
   #endif

    return UIStatusBarStyleDefault;
}

- (void) viewDidLoad
{
    sendScreenBoundsUpdate (self);
    [super viewDidLoad];
}

- (void) viewWillAppear: (BOOL) animated
{
    sendScreenBoundsUpdate (self);
    [super viewWillAppear:animated];
}

- (void) viewDidAppear: (BOOL) animated
{
    sendScreenBoundsUpdate (self);
    [super viewDidAppear:animated];
}

- (void) viewWillLayoutSubviews
{
    sendScreenBoundsUpdate (self);
}

- (void) viewDidLayoutSubviews
{
    sendScreenBoundsUpdate (self);
}

@end

@implementation JuceUIView

- (JuceUIView*) initWithOwner: (UIViewComponentPeer*) peer
                    withFrame: (CGRect) frame
{
    [super initWithFrame: frame];
    owner = peer;

    displayLink.reset ([CADisplayLink displayLinkWithTarget: self
                                                   selector: @selector (displayLinkCallback:)]);
    [displayLink.get() addToRunLoop: [NSRunLoop mainRunLoop]
                            forMode: NSDefaultRunLoopMode];

    hiddenTextView = [[UITextView alloc] initWithFrame: CGRectZero];
    [self addSubview: hiddenTextView];
    hiddenTextView.delegate = self;

    hiddenTextView.autocapitalizationType = UITextAutocapitalizationTypeNone;
    hiddenTextView.autocorrectionType = UITextAutocorrectionTypeNo;
    hiddenTextView.inputAssistantItem.leadingBarButtonGroups = @[];
    hiddenTextView.inputAssistantItem.trailingBarButtonGroups = @[];

   #if JUCE_HAS_IOS_POINTER_SUPPORT
    if (@available (iOS 13.4, *))
    {
        auto hoverRecognizer = [[[UIHoverGestureRecognizer alloc] initWithTarget: self action: @selector (onHover:)] autorelease];
        [hoverRecognizer setCancelsTouchesInView: NO];
        [hoverRecognizer setRequiresExclusiveTouchType: YES];
        [self addGestureRecognizer: hoverRecognizer];

        auto panRecognizer = [[[UIPanGestureRecognizer alloc] initWithTarget: self action: @selector (onScroll:)] autorelease];
        [panRecognizer setCancelsTouchesInView: NO];
        [panRecognizer setRequiresExclusiveTouchType: YES];
        [panRecognizer setAllowedScrollTypesMask: UIScrollTypeMaskAll];
        [panRecognizer setMaximumNumberOfTouches: 0];
        [self addGestureRecognizer: panRecognizer];
    }
   #endif

    return self;
}

- (void) dealloc
{
    [hiddenTextView removeFromSuperview];
    [hiddenTextView release];

    displayLink = nullptr;

    [super dealloc];
}

//==============================================================================
+ (Class) layerClass
{
   #if JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS
    if (@available (iOS 12, *))
        return [CAMetalLayer class];
   #endif

    return [CALayer class];
}

- (void) displayLinkCallback: (CADisplayLink*) dl
{
    if (owner != nullptr)
        owner->displayLinkCallback();
}

//==============================================================================
- (void) drawRect: (CGRect) r
{
    if (owner != nullptr)
        owner->drawRect (r);
}

//==============================================================================
- (void) touchesBegan: (NSSet*) touches withEvent: (UIEvent*) event
{
    ignoreUnused (touches);

    if (owner != nullptr)
        owner->handleTouches (event, MouseEventFlags::down);
}

- (void) touchesMoved: (NSSet*) touches withEvent: (UIEvent*) event
{
    ignoreUnused (touches);

    if (owner != nullptr)
        owner->handleTouches (event, MouseEventFlags::none);
}

- (void) touchesEnded: (NSSet*) touches withEvent: (UIEvent*) event
{
    ignoreUnused (touches);

    if (owner != nullptr)
        owner->handleTouches (event, MouseEventFlags::up);
}

- (void) touchesCancelled: (NSSet*) touches withEvent: (UIEvent*) event
{
    if (owner != nullptr)
        owner->handleTouches (event, MouseEventFlags::upAndCancel);

    [self touchesEnded: touches withEvent: event];
}

#if JUCE_HAS_IOS_POINTER_SUPPORT
- (void) onHover: (UIHoverGestureRecognizer*) gesture
{
    if (owner != nullptr)
        owner->onHover (gesture);
}

- (void) onScroll: (UIPanGestureRecognizer*) gesture
{
    if (owner != nullptr)
        owner->onScroll (gesture);
}
#endif

//==============================================================================
- (BOOL) becomeFirstResponder
{
    if (owner != nullptr)
        owner->viewFocusGain();

    return true;
}

- (BOOL) resignFirstResponder
{
    if (owner != nullptr)
        owner->viewFocusLoss();

    return [super resignFirstResponder];
}

- (BOOL) canBecomeFirstResponder
{
    return owner != nullptr && owner->canBecomeKeyWindow();
}

- (BOOL) textView: (UITextView*) textView shouldChangeTextInRange: (NSRange) range replacementText: (NSString*) text
{
    ignoreUnused (textView);
    return owner->textViewReplaceCharacters (Range<int> ((int) range.location, (int) (range.location + range.length)),
                                             nsStringToJuce (text));
}

- (void) traitCollectionDidChange: (UITraitCollection*) previousTraitCollection
{
    [super traitCollectionDidChange: previousTraitCollection];

   #if defined (__IPHONE_12_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_12_0
    if (@available (iOS 12.0, *))
    {
        const auto wasDarkModeActive = ([previousTraitCollection userInterfaceStyle] == UIUserInterfaceStyleDark);

        if (wasDarkModeActive != Desktop::getInstance().isDarkModeActive())
            [[NSNotificationCenter defaultCenter] postNotificationName: UIViewComponentPeer::getDarkModeNotificationName()
                                                                object: nil];
    }
   #endif
}

- (BOOL) isAccessibilityElement
{
    return NO;
}

- (CGRect) accessibilityFrame
{
    if (owner != nullptr)
        if (auto* handler = owner->getComponent().getAccessibilityHandler())
            return convertToCGRect (handler->getComponent().getScreenBounds());

    return CGRectZero;
}

- (NSArray*) accessibilityElements
{
    if (owner != nullptr)
        if (auto* handler = owner->getComponent().getAccessibilityHandler())
            return getContainerAccessibilityElements (*handler);

    return nil;
}

@end

//==============================================================================
@implementation JuceUIWindow

- (void) setOwner: (UIViewComponentPeer*) peer
{
    owner = peer;
}

- (void) becomeKeyWindow
{
    [super becomeKeyWindow];

    if (owner != nullptr)
        owner->grabFocus();
}

@end

//==============================================================================
//==============================================================================
namespace juce
{

bool KeyPress::isKeyCurrentlyDown (int)
{
    return false;
}

Point<float> juce_lastMousePos;

//==============================================================================
UIViewComponentPeer::UIViewComponentPeer (Component& comp, int windowStyleFlags, UIView* viewToAttachTo)
    : ComponentPeer (comp, windowStyleFlags),
      isSharedWindow (viewToAttachTo != nil),
      isAppex (SystemStats::isRunningInAppExtensionSandbox())
{
    CGRect r = convertToCGRect (component.getBounds());

    view = [[JuceUIView alloc] initWithOwner: this withFrame: r];

    view.multipleTouchEnabled = YES;
    view.hidden = true;
    view.opaque = component.isOpaque();
    view.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent: 0];

   #if JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS
    if (@available (iOS 12, *))
        metalRenderer = std::make_unique<CoreGraphicsMetalLayerRenderer> ((CAMetalLayer*) view.layer, comp);
   #endif

    if ((windowStyleFlags & ComponentPeer::windowRequiresSynchronousCoreGraphicsRendering) == 0)
        [[view layer] setDrawsAsynchronously: YES];

    if (isSharedWindow)
    {
        window = [viewToAttachTo window];
        [viewToAttachTo addSubview: view];
    }
    else
    {
        r = convertToCGRect (component.getBounds());
        r.origin.y = [UIScreen mainScreen].bounds.size.height - (r.origin.y + r.size.height);

        window = [[JuceUIWindow alloc] initWithFrame: r];
        [((JuceUIWindow*) window) setOwner: this];

        controller = [[JuceUIViewController alloc] init];
        controller.view = view;
        window.rootViewController = controller;

        window.hidden = true;
        window.opaque = component.isOpaque();
        window.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent: 0];

        if (component.isAlwaysOnTop())
            window.windowLevel = UIWindowLevelAlert;

        view.frame = CGRectMake (0, 0, r.size.width, r.size.height);
    }

    setTitle (component.getName());
    setVisible (component.isVisible());

    Desktop::getInstance().addFocusChangeListener (this);
}

static UIViewComponentPeer* currentlyFocusedPeer = nullptr;

UIViewComponentPeer::~UIViewComponentPeer()
{
    if (currentlyFocusedPeer == this)
        currentlyFocusedPeer = nullptr;

    currentTouches.deleteAllTouchesForPeer (this);
    Desktop::getInstance().removeFocusChangeListener (this);

    view->owner = nullptr;
    [view removeFromSuperview];
    [view release];
    [controller release];

    if (! isSharedWindow)
    {
        [((JuceUIWindow*) window) setOwner: nil];

      #if defined (__IPHONE_13_0)
        if (@available (iOS 13.0, *))
            window.windowScene = nil;
      #endif

        [window release];
    }
}

//==============================================================================
void UIViewComponentPeer::setVisible (bool shouldBeVisible)
{
    if (! isSharedWindow)
        window.hidden = ! shouldBeVisible;

    view.hidden = ! shouldBeVisible;
}

void UIViewComponentPeer::setTitle (const String&)
{
    // xxx is this possible?
}

void UIViewComponentPeer::setBounds (const Rectangle<int>& newBounds, const bool isNowFullScreen)
{
    fullScreen = isNowFullScreen;

    if (isSharedWindow)
    {
        CGRect r = convertToCGRect (newBounds);

        if (view.frame.size.width != r.size.width || view.frame.size.height != r.size.height)
            [view setNeedsDisplay];

        view.frame = r;
    }
    else
    {
        window.frame = convertToCGRect (newBounds);
        view.frame = CGRectMake (0, 0, (CGFloat) newBounds.getWidth(), (CGFloat) newBounds.getHeight());

        handleMovedOrResized();
    }
}

Rectangle<int> UIViewComponentPeer::getBounds (const bool global) const
{
    auto r = view.frame;

    if (global)
    {
        if (view.window != nil)
        {
            r = [view convertRect: r toView: view.window];
            r = [view.window convertRect: r toWindow: nil];
        }
        else if (window != nil)
        {
            r.origin.x += window.frame.origin.x;
            r.origin.y += window.frame.origin.y;
        }
    }

    return convertToRectInt (r);
}

Point<float> UIViewComponentPeer::localToGlobal (Point<float> relativePosition)
{
    return relativePosition + getBounds (true).getPosition().toFloat();
}

Point<float> UIViewComponentPeer::globalToLocal (Point<float> screenPosition)
{
    return screenPosition - getBounds (true).getPosition().toFloat();
}

void UIViewComponentPeer::setAlpha (float newAlpha)
{
    [view.window setAlpha: (CGFloat) newAlpha];
}

void UIViewComponentPeer::setFullScreen (bool shouldBeFullScreen)
{
    if (! isSharedWindow)
    {
        auto r = shouldBeFullScreen ? Desktop::getInstance().getDisplays().getPrimaryDisplay()->userArea
                                    : lastNonFullscreenBounds;

        if ((! shouldBeFullScreen) && r.isEmpty())
            r = getBounds();

        // (can't call the component's setBounds method because that'll reset our fullscreen flag)
        if (! r.isEmpty())
            setBounds (ScalingHelpers::scaledScreenPosToUnscaled (component, r), shouldBeFullScreen);

        component.repaint();
    }
}

void UIViewComponentPeer::updateScreenBounds()
{
    auto& desktop = Desktop::getInstance();

    auto oldArea = component.getBounds();
    auto oldDesktop = desktop.getDisplays().getPrimaryDisplay()->userArea;

    forceDisplayUpdate();

    if (fullScreen)
    {
        fullScreen = false;
        setFullScreen (true);
    }
    else if (! isSharedWindow)
    {
        auto newDesktop = desktop.getDisplays().getPrimaryDisplay()->userArea;

        if (newDesktop != oldDesktop)
        {
            // this will re-centre the window, but leave its size unchanged

            auto centreRelX = oldArea.getCentreX() / (float) oldDesktop.getWidth();
            auto centreRelY = oldArea.getCentreY() / (float) oldDesktop.getHeight();

            auto x = ((int) (newDesktop.getWidth()  * centreRelX)) - (oldArea.getWidth()  / 2);
            auto y = ((int) (newDesktop.getHeight() * centreRelY)) - (oldArea.getHeight() / 2);

            component.setBounds (oldArea.withPosition (x, y));
        }
    }

    [view setNeedsDisplay];
}

bool UIViewComponentPeer::contains (Point<int> localPos, bool trueIfInAChildWindow) const
{
    if (! ScalingHelpers::scaledScreenPosToUnscaled (component, component.getLocalBounds()).contains (localPos))
        return false;

    UIView* v = [view hitTest: convertToCGPoint (localPos)
                    withEvent: nil];

    if (trueIfInAChildWindow)
        return v != nil;

    return v == view;
}

bool UIViewComponentPeer::setAlwaysOnTop (bool alwaysOnTop)
{
    if (! isSharedWindow)
        window.windowLevel = alwaysOnTop ? UIWindowLevelAlert : UIWindowLevelNormal;

    return true;
}

void UIViewComponentPeer::toFront (bool makeActiveWindow)
{
    if (isSharedWindow)
        [[view superview] bringSubviewToFront: view];

    if (makeActiveWindow && window != nil && component.isVisible())
        [window makeKeyAndVisible];
}

void UIViewComponentPeer::toBehind (ComponentPeer* other)
{
    if (auto* otherPeer = dynamic_cast<UIViewComponentPeer*> (other))
    {
        if (isSharedWindow)
            [[view superview] insertSubview: view belowSubview: otherPeer->view];
    }
    else
    {
        jassertfalse; // wrong type of window?
    }
}

void UIViewComponentPeer::setIcon (const Image& /*newIcon*/)
{
    // to do..
}

//==============================================================================
static float getMaximumTouchForce (UITouch* touch) noexcept
{
    if ([touch respondsToSelector: @selector (maximumPossibleForce)])
        return (float) touch.maximumPossibleForce;

    return 0.0f;
}

static float getTouchForce (UITouch* touch) noexcept
{
    if ([touch respondsToSelector: @selector (force)])
        return (float) touch.force;

    return 0.0f;
}

void UIViewComponentPeer::handleTouches (UIEvent* event, MouseEventFlags mouseEventFlags)
{
    NSArray* touches = [[event touchesForView: view] allObjects];

    for (unsigned int i = 0; i < [touches count]; ++i)
    {
        UITouch* touch = [touches objectAtIndex: i];
        auto maximumForce = getMaximumTouchForce (touch);

        if ([touch phase] == UITouchPhaseStationary && maximumForce <= 0)
            continue;

        auto pos = convertToPointFloat ([touch locationInView: view]);
        juce_lastMousePos = pos + getBounds (true).getPosition().toFloat();

        auto time = getMouseTime (event);
        auto touchIndex = currentTouches.getIndexOfTouch (this, touch);

        auto modsToSend = ModifierKeys::currentModifiers;

        auto isUp = [] (MouseEventFlags m)
        {
            return m == MouseEventFlags::up || m == MouseEventFlags::upAndCancel;
        };

        if (mouseEventFlags == MouseEventFlags::down)
        {
            if ([touch phase] != UITouchPhaseBegan)
                continue;

            ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withoutMouseButtons().withFlags (ModifierKeys::leftButtonModifier);
            modsToSend = ModifierKeys::currentModifiers;

            // this forces a mouse-enter/up event, in case for some reason we didn't get a mouse-up before.
            handleMouseEvent (MouseInputSource::InputSourceType::touch, pos, modsToSend.withoutMouseButtons(),
                              MouseInputSource::defaultPressure, MouseInputSource::defaultOrientation, time, {}, touchIndex);

            if (! isValidPeer (this)) // (in case this component was deleted by the event)
                return;
        }
        else if (isUp (mouseEventFlags))
        {
            if (! ([touch phase] == UITouchPhaseEnded || [touch phase] == UITouchPhaseCancelled))
                continue;

            modsToSend = modsToSend.withoutMouseButtons();
            currentTouches.clearTouch (touchIndex);

            if (! currentTouches.areAnyTouchesActive())
                mouseEventFlags = MouseEventFlags::upAndCancel;
        }

        if (mouseEventFlags == MouseEventFlags::upAndCancel)
        {
            currentTouches.clearTouch (touchIndex);
            modsToSend = ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withoutMouseButtons();
        }

        // NB: some devices return 0 or 1.0 if pressure is unknown, so we'll clip our value to a believable range:
        auto pressure = maximumForce > 0 ? jlimit (0.0001f, 0.9999f, getTouchForce (touch) / maximumForce)
                                         : MouseInputSource::defaultPressure;

        handleMouseEvent (MouseInputSource::InputSourceType::touch,
                          pos, modsToSend, pressure, MouseInputSource::defaultOrientation, time, { }, touchIndex);

        if (! isValidPeer (this)) // (in case this component was deleted by the event)
            return;

        if (isUp (mouseEventFlags))
        {
            handleMouseEvent (MouseInputSource::InputSourceType::touch, MouseInputSource::offscreenMousePos, modsToSend,
                              MouseInputSource::defaultPressure, MouseInputSource::defaultOrientation, time, {}, touchIndex);

            if (! isValidPeer (this))
                return;
        }
    }
}

#if JUCE_HAS_IOS_POINTER_SUPPORT
void UIViewComponentPeer::onHover (UIHoverGestureRecognizer* gesture)
{
    auto pos = convertToPointFloat ([gesture locationInView: view]);
    juce_lastMousePos = pos + getBounds (true).getPosition().toFloat();

    handleMouseEvent (MouseInputSource::InputSourceType::touch,
                      pos,
                      ModifierKeys::currentModifiers,
                      MouseInputSource::defaultPressure, MouseInputSource::defaultOrientation,
                      UIViewComponentPeer::getMouseTime ([[NSProcessInfo processInfo] systemUptime]),
                      {});
}

void UIViewComponentPeer::onScroll (UIPanGestureRecognizer* gesture)
{
    const auto offset = [gesture translationInView: view];
    const auto scale = 0.5f / 256.0f;

    MouseWheelDetails details;
    details.deltaX = scale * (float) offset.x;
    details.deltaY = scale * (float) offset.y;
    details.isReversed = false;
    details.isSmooth = true;
    details.isInertial = false;

    handleMouseWheel (MouseInputSource::InputSourceType::touch,
                      convertToPointFloat ([gesture locationInView: view]),
                      UIViewComponentPeer::getMouseTime ([[NSProcessInfo processInfo] systemUptime]),
                      details);
}
#endif

//==============================================================================
void UIViewComponentPeer::viewFocusGain()
{
    if (currentlyFocusedPeer != this)
    {
        if (ComponentPeer::isValidPeer (currentlyFocusedPeer))
            currentlyFocusedPeer->handleFocusLoss();

        currentlyFocusedPeer = this;

        handleFocusGain();
    }
}

void UIViewComponentPeer::viewFocusLoss()
{
    if (currentlyFocusedPeer == this)
    {
        currentlyFocusedPeer = nullptr;
        handleFocusLoss();
    }
}

bool UIViewComponentPeer::isFocused() const
{
    if (isAppex)
        return true;

    return isSharedWindow ? this == currentlyFocusedPeer
                          : (window != nil && [window isKeyWindow]);
}

void UIViewComponentPeer::grabFocus()
{
    if (window != nil)
    {
        [window makeKeyWindow];
        viewFocusGain();
    }
}

void UIViewComponentPeer::textInputRequired (Point<int>, TextInputTarget&)
{
}

static UIKeyboardType getUIKeyboardType (TextInputTarget::VirtualKeyboardType type) noexcept
{
    switch (type)
    {
        case TextInputTarget::textKeyboard:          return UIKeyboardTypeAlphabet;
        case TextInputTarget::numericKeyboard:       return UIKeyboardTypeNumbersAndPunctuation;
        case TextInputTarget::decimalKeyboard:       return UIKeyboardTypeNumbersAndPunctuation;
        case TextInputTarget::urlKeyboard:           return UIKeyboardTypeURL;
        case TextInputTarget::emailAddressKeyboard:  return UIKeyboardTypeEmailAddress;
        case TextInputTarget::phoneNumberKeyboard:   return UIKeyboardTypePhonePad;
        default:                                     jassertfalse; break;
    }

    return UIKeyboardTypeDefault;
}

void UIViewComponentPeer::updateHiddenTextContent (TextInputTarget* target)
{
    view->hiddenTextView.keyboardType = getUIKeyboardType (target->getKeyboardType());
    view->hiddenTextView.text = juceStringToNS (target->getTextInRange (Range<int> (0, target->getHighlightedRegion().getStart())));
    view->hiddenTextView.selectedRange = NSMakeRange ((NSUInteger) target->getHighlightedRegion().getStart(), 0);
}

BOOL UIViewComponentPeer::textViewReplaceCharacters (Range<int> range, const String& text)
{
    if (auto* target = findCurrentTextInputTarget())
    {
        auto currentSelection = target->getHighlightedRegion();

        if (range.getLength() == 1 && text.isEmpty()) // (detect backspace)
            if (currentSelection.isEmpty())
                target->setHighlightedRegion (currentSelection.withStart (currentSelection.getStart() - 1));

        WeakReference<Component> deletionChecker (dynamic_cast<Component*> (target));

        if (text == "\r" || text == "\n" || text == "\r\n")
            handleKeyPress (KeyPress::returnKey, text[0]);
        else
            target->insertTextAtCaret (text);

        if (deletionChecker != nullptr)
            updateHiddenTextContent (target);
    }

    return NO;
}

void UIViewComponentPeer::globalFocusChanged (Component*)
{
    if (auto* target = findCurrentTextInputTarget())
    {
        if (auto* comp = dynamic_cast<Component*> (target))
        {
            auto pos = component.getLocalPoint (comp, Point<int>());
            view->hiddenTextView.frame = CGRectMake (pos.x, pos.y, 0, 0);

            updateHiddenTextContent (target);
            [view->hiddenTextView becomeFirstResponder];
        }
    }
    else
    {
        [view->hiddenTextView resignFirstResponder];
    }
}

//==============================================================================
void UIViewComponentPeer::displayLinkCallback()
{
    if (deferredRepaints.isEmpty())
        return;

    auto dispatchRectangles = [this] ()
    {
        // We shouldn't need this preprocessor guard, but when running in the simulator
        // CAMetalLayer is flagged as requiring iOS 13
       #if JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS
        if (metalRenderer != nullptr)
        {
            if (@available (iOS 12, *))
            {
                return metalRenderer->drawRectangleList ((CAMetalLayer*) view.layer,
                                                         (float) view.contentScaleFactor,
                                                         view.frame,
                                                         component,
                                                         [this] (CGContextRef ctx, CGRect r) { drawRectWithContext (ctx, r); },
                                                         deferredRepaints);
            }

            // The creation of metalRenderer should already be guarded with @available (iOS 12, *).
            jassertfalse;
            return false;
        }
       #endif

        for (const auto& r : deferredRepaints)
            [view setNeedsDisplayInRect: convertToCGRect (r)];

        return true;
    };

    if (dispatchRectangles())
        deferredRepaints.clear();
}

//==============================================================================
void UIViewComponentPeer::drawRect (CGRect r)
{
    if (r.size.width < 1.0f || r.size.height < 1.0f)
        return;

    drawRectWithContext (UIGraphicsGetCurrentContext(), r);
}

void UIViewComponentPeer::drawRectWithContext (CGContextRef cg, CGRect)
{
    if (! component.isOpaque())
        CGContextClearRect (cg, CGContextGetClipBoundingBox (cg));

    CGContextConcatCTM (cg, CGAffineTransformMake (1, 0, 0, -1, 0, getComponent().getHeight()));
    CoreGraphicsContext g (cg, getComponent().getHeight());

    insideDrawRect = true;
    handlePaint (g);
    insideDrawRect = false;
}

bool UIViewComponentPeer::canBecomeKeyWindow()
{
    return (getStyleFlags() & juce::ComponentPeer::windowIgnoresKeyPresses) == 0;
}

//==============================================================================
void Desktop::setKioskComponent (Component* kioskModeComp, bool enableOrDisable, bool /*allowMenusAndBars*/)
{
    displays->refresh();

    if (auto* peer = kioskModeComp->getPeer())
    {
        if (auto* uiViewPeer = dynamic_cast<UIViewComponentPeer*> (peer))
            [uiViewPeer->controller setNeedsStatusBarAppearanceUpdate];

        peer->setFullScreen (enableOrDisable);
    }
}

void Desktop::allowedOrientationsChanged()
{
    // if the current orientation isn't allowed anymore then switch orientations
    if (! isOrientationEnabled (getCurrentOrientation()))
    {
        auto newOrientation = [this]
        {
            for (auto orientation : { upright, upsideDown, rotatedClockwise, rotatedAntiClockwise })
                if (isOrientationEnabled (orientation))
                    return orientation;

            // you need to support at least one orientation
            jassertfalse;
            return upright;
        }();

        NSNumber* value = [NSNumber numberWithInt: (int) Orientations::convertFromJuce (newOrientation)];
        [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
        [value release];
    }
}

//==============================================================================
void UIViewComponentPeer::repaint (const Rectangle<int>& area)
{
    if (insideDrawRect || ! MessageManager::getInstance()->isThisTheMessageThread())
    {
        (new AsyncRepaintMessage (this, area))->post();
        return;
    }

    deferredRepaints.add (area.toFloat());
}

void UIViewComponentPeer::performAnyPendingRepaintsNow()
{
}

ComponentPeer* Component::createNewPeer (int styleFlags, void* windowToAttachTo)
{
    return new UIViewComponentPeer (*this, styleFlags, (UIView*) windowToAttachTo);
}

//==============================================================================
const int KeyPress::spaceKey              = ' ';
const int KeyPress::returnKey             = 0x0d;
const int KeyPress::escapeKey             = 0x1b;
const int KeyPress::backspaceKey          = 0x7f;
const int KeyPress::leftKey               = 0x1000;
const int KeyPress::rightKey              = 0x1001;
const int KeyPress::upKey                 = 0x1002;
const int KeyPress::downKey               = 0x1003;
const int KeyPress::pageUpKey             = 0x1004;
const int KeyPress::pageDownKey           = 0x1005;
const int KeyPress::endKey                = 0x1006;
const int KeyPress::homeKey               = 0x1007;
const int KeyPress::deleteKey             = 0x1008;
const int KeyPress::insertKey             = -1;
const int KeyPress::tabKey                = 9;
const int KeyPress::F1Key                 = 0x2001;
const int KeyPress::F2Key                 = 0x2002;
const int KeyPress::F3Key                 = 0x2003;
const int KeyPress::F4Key                 = 0x2004;
const int KeyPress::F5Key                 = 0x2005;
const int KeyPress::F6Key                 = 0x2006;
const int KeyPress::F7Key                 = 0x2007;
const int KeyPress::F8Key                 = 0x2008;
const int KeyPress::F9Key                 = 0x2009;
const int KeyPress::F10Key                = 0x200a;
const int KeyPress::F11Key                = 0x200b;
const int KeyPress::F12Key                = 0x200c;
const int KeyPress::F13Key                = 0x200d;
const int KeyPress::F14Key                = 0x200e;
const int KeyPress::F15Key                = 0x200f;
const int KeyPress::F16Key                = 0x2010;
const int KeyPress::F17Key                = 0x2011;
const int KeyPress::F18Key                = 0x2012;
const int KeyPress::F19Key                = 0x2013;
const int KeyPress::F20Key                = 0x2014;
const int KeyPress::F21Key                = 0x2015;
const int KeyPress::F22Key                = 0x2016;
const int KeyPress::F23Key                = 0x2017;
const int KeyPress::F24Key                = 0x2018;
const int KeyPress::F25Key                = 0x2019;
const int KeyPress::F26Key                = 0x201a;
const int KeyPress::F27Key                = 0x201b;
const int KeyPress::F28Key                = 0x201c;
const int KeyPress::F29Key                = 0x201d;
const int KeyPress::F30Key                = 0x201e;
const int KeyPress::F31Key                = 0x201f;
const int KeyPress::F32Key                = 0x2020;
const int KeyPress::F33Key                = 0x2021;
const int KeyPress::F34Key                = 0x2022;
const int KeyPress::F35Key                = 0x2023;
const int KeyPress::numberPad0            = 0x30020;
const int KeyPress::numberPad1            = 0x30021;
const int KeyPress::numberPad2            = 0x30022;
const int KeyPress::numberPad3            = 0x30023;
const int KeyPress::numberPad4            = 0x30024;
const int KeyPress::numberPad5            = 0x30025;
const int KeyPress::numberPad6            = 0x30026;
const int KeyPress::numberPad7            = 0x30027;
const int KeyPress::numberPad8            = 0x30028;
const int KeyPress::numberPad9            = 0x30029;
const int KeyPress::numberPadAdd          = 0x3002a;
const int KeyPress::numberPadSubtract     = 0x3002b;
const int KeyPress::numberPadMultiply     = 0x3002c;
const int KeyPress::numberPadDivide       = 0x3002d;
const int KeyPress::numberPadSeparator    = 0x3002e;
const int KeyPress::numberPadDecimalPoint = 0x3002f;
const int KeyPress::numberPadEquals       = 0x30030;
const int KeyPress::numberPadDelete       = 0x30031;
const int KeyPress::playKey               = 0x30000;
const int KeyPress::stopKey               = 0x30001;
const int KeyPress::fastForwardKey        = 0x30002;
const int KeyPress::rewindKey             = 0x30003;

} // namespace juce