WKWebViewIOS.mm   [plain text]

/*
* Copyright (C) 2014-2020 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.
*/

#import "config.h"
#import "WKWebViewIOS.h"

#if PLATFORM(IOS_FAMILY)

#import "FrontBoardServicesSPI.h"
#import "NativeWebWheelEvent.h"
#import "NavigationState.h"
#import "RemoteLayerTreeDrawingAreaProxy.h"
#import "RemoteLayerTreeScrollingPerformanceData.h"
#import "RemoteLayerTreeViews.h"
#import "RemoteScrollingCoordinatorProxy.h"
#import "VideoFullscreenManagerProxy.h"
#import "ViewGestureController.h"
#import "WKBackForwardListItemInternal.h"
#import "WKContentView.h"
#import "WKPasswordView.h"
#import "WKSafeBrowsingWarning.h"
#import "WKScrollView.h"
#import "WKUIDelegatePrivate.h"
#import "WKWebViewConfigurationInternal.h"
#import "WKWebViewContentProvider.h"
#import "WKWebViewContentProviderRegistry.h"
#import "WKWebViewPrivate.h"
#import "WKWebViewPrivateForTestingIOS.h"
#import "WebBackForwardList.h"
#import "WebIOSEventFactory.h"
#import "WebPageProxy.h"
#import "_WKActivatedElementInfoInternal.h"
#import <WebCore/GraphicsContextCG.h>
#import <WebCore/IOSurface.h>
#import <WebCore/LocalCurrentTraitCollection.h>
#import <WebCore/MIMETypeRegistry.h>
#import <WebCore/VersionChecks.h>
#import <pal/spi/cocoa/QuartzCoreSPI.h>
#import <pal/spi/ios/GraphicsServicesSPI.h>
#import <wtf/cocoa/VectorCocoa.h>

#if ENABLE(DATA_DETECTION)
#import "WKDataDetectorTypesInternal.h"
#endif

#include "UIKitSoftLink.h"

#define FORWARD_ACTION_TO_WKCONTENTVIEW(_action) \
- (void)_action:(id)sender \
{ \
if (self.usesStandardContentView) \
[_contentView _action ## ForWebView:sender]; \
}

#define RELEASE_LOG_IF_ALLOWED(...) RELEASE_LOG_IF(_page && _page->isAlwaysOnLoggingAllowed(), ViewState, __VA_ARGS__)

static const Seconds delayBeforeNoVisibleContentsRectsLogging = 1_s;
static const Seconds delayBeforeNoCommitsLogging = 5_s;

static int32_t deviceOrientationForUIInterfaceOrientation(UIInterfaceOrientation orientation)
{
switch (orientation) {
case UIInterfaceOrientationUnknown:
case UIInterfaceOrientationPortrait:
return 0;
case UIInterfaceOrientationPortraitUpsideDown:
return 180;
case UIInterfaceOrientationLandscapeLeft:
return -90;
case UIInterfaceOrientationLandscapeRight:
return 90;
}
}

@interface UIView (UIViewInternal)
- (UIViewController *)_viewControllerForAncestor;
@end

@interface UIWindow (UIWindowInternal)
- (BOOL)_isHostedInAnotherProcess;
@end

@interface UIViewController (UIViewControllerInternal)
- (UIViewController *)_rootAncestorViewController;
- (UIViewController *)_viewControllerForSupportedInterfaceOrientations;
@end

@implementation WKWebView (WKViewInternalIOS)

- (void)setFrame:(CGRect)frame
{
CGRect oldFrame = self.frame;
[super setFrame:frame];

if (!CGSizeEqualToSize(oldFrame.size, frame.size))
[self _frameOrBoundsChanged];
}

- (void)setBounds:(CGRect)bounds
{
CGRect oldBounds = self.bounds;
[super setBounds:bounds];
[_customContentFixedOverlayView setFrame:self.bounds];

if (!CGSizeEqualToSize(oldBounds.size, bounds.size))
[self _frameOrBoundsChanged];
}

- (void)layoutSubviews
{
[_safeBrowsingWarning setFrame:self.bounds];
[super layoutSubviews];
[self _frameOrBoundsChanged];
}

#pragma mark - iOS implementation methods

- (void)_setupScrollAndContentViews
{
CGRect bounds = self.bounds;
_scrollView = adoptNS([[WKScrollView alloc] initWithFrame:bounds]);
[_scrollView setInternalDelegate:self];
[_scrollView setBouncesZoom:YES];

#if HAVE(UISCROLLVIEW_ASYNCHRONOUS_SCROLL_EVENT_HANDLING)
[_scrollView _setAllowsAsyncScrollEvent:YES];
#endif

if ([_scrollView respondsToSelector:@selector(_setAvoidsJumpOnInterruptedBounce:)]) {
[_scrollView setTracksImmediatelyWhileDecelerating:NO];
[_scrollView _setAvoidsJumpOnInterruptedBounce:YES];
}

[self _updateScrollViewInsetAdjustmentBehavior];

[self addSubview:_scrollView.get()];

[self _dispatchSetDeviceOrientation:[self _deviceOrientation]];

[_contentView layer].anchorPoint = CGPointZero;
[_contentView setFrame:bounds];
[_scrollView addSubview:_contentView.get()];
[_scrollView addSubview:[_contentView unscaledView]];
}

- (void)_registerForNotifications
{
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserver:self selector:@selector(_keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
[center addObserver:self selector:@selector(_keyboardDidChangeFrame:) name:UIKeyboardDidChangeFrameNotification object:nil];
[center addObserver:self selector:@selector(_keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
[center addObserver:self selector:@selector(_keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
[center addObserver:self selector:@selector(_keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
[center addObserver:self selector:@selector(_windowDidRotate:) name:UIWindowDidRotateNotification object:nil];
[center addObserver:self selector:@selector(_contentSizeCategoryDidChange:) name:UIContentSizeCategoryDidChangeNotification object:nil];

[center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityGrayscaleStatusDidChangeNotification object:nil];
[center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityInvertColorsStatusDidChangeNotification object:nil];
[center addObserver:self selector:@selector(_accessibilitySettingsDidChange:) name:UIAccessibilityReduceMotionStatusDidChangeNotification object:nil];
}

- (BOOL)_isShowingVideoPictureInPicture
{
#if ENABLE(VIDEO_PRESENTATION_MODE)
if (!_page || !_page->videoFullscreenManager())
return false;

return _page->videoFullscreenManager()->hasMode(WebCore::HTMLMediaElementEnums::VideoFullscreenModePictureInPicture);
#else
return false;
#endif
}

- (BOOL)_mayAutomaticallyShowVideoPictureInPicture
{
#if ENABLE(VIDEO_PRESENTATION_MODE)
if (!_page || !_page->videoFullscreenManager())
return false;

return _page->videoFullscreenManager()->mayAutomaticallyShowVideoPictureInPicture();
#else
return false;
#endif
}

- (void)_incrementFocusPreservationCount
{
++_focusPreservationCount;
}

- (void)_decrementFocusPreservationCount
{
if (_focusPreservationCount)
--_focusPreservationCount;
}

- (void)_resetFocusPreservationCount
{
_focusPreservationCount = 0;
}

- (BOOL)_isRetainingActiveFocusedState
{
// Focus preservation count fulfills the same role as active focus state count.
// However, unlike active focus state, it may be reset to 0 without impacting the
// behavior of -_retainActiveFocusedState, and it's harmless to invoke
// -_decrementFocusPreservationCount after resetting the count to 0.
return _focusPreservationCount || _activeFocusedStateRetainCount;
}

- (int32_t)_deviceOrientation
{
auto orientation = UIInterfaceOrientationUnknown;
auto application = UIApplication.sharedApplication;
ALLOW_DEPRECATED_DECLARATIONS_BEGIN
if (!application._appAdoptsUISceneLifecycle)
orientation = application.statusBarOrientation;
ALLOW_DEPRECATED_DECLARATIONS_END
else if (auto windowScene = self.window.windowScene)
orientation = windowScene.interfaceOrientation;
return deviceOrientationForUIInterfaceOrientation(orientation);
}

- (BOOL)_effectiveAppearanceIsDark
{
return self.traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark;
}

- (BOOL)_effectiveUserInterfaceLevelIsElevated
{
#if HAVE(OS_DARK_MODE_SUPPORT) && !PLATFORM(WATCHOS)
return self.traitCollection.userInterfaceLevel == UIUserInterfaceLevelElevated;
#else
return NO;
#endif
}

- (void)_populateArchivedSubviews:(NSMutableSet *)encodedViews
{
[super _populateArchivedSubviews:encodedViews];

if (_scrollView)
[encodedViews removeObject:_scrollView.get()];
if (_customContentFixedOverlayView)
[encodedViews removeObject:_customContentFixedOverlayView.get()];
}

- (BOOL)_isBackground
{
if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_isBackground)])
return [_customContentView web_isBackground];
return [_contentView isBackground];
}

ALLOW_DEPRECATED_DECLARATIONS_BEGIN
- (WKBrowsingContextController *)browsingContextController
{
return [_contentView browsingContextController];
}
ALLOW_DEPRECATED_DECLARATIONS_END

- (BOOL)becomeFirstResponder
{
UIView *currentContentView = self._currentContentView;
if (currentContentView == _contentView && [_contentView superview])
return [_contentView becomeFirstResponderForWebView] || [super becomeFirstResponder];

return [currentContentView becomeFirstResponder] || [super becomeFirstResponder];
}

- (BOOL)canBecomeFirstResponder
{
if (self._currentContentView == _contentView)
return [_contentView canBecomeFirstResponderForWebView];

return YES;
}

- (BOOL)resignFirstResponder
{
if ([_contentView isFirstResponder])
return [_contentView resignFirstResponderForWebView];

return [super resignFirstResponder];
}

FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
#define FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_action) \
if (action == @selector(_action:)) \
return self.usesStandardContentView && [_contentView canPerformActionForWebView:action withSender:sender];

FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFont:sender)

#undef FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW

return [super canPerformAction:action withSender:sender];
}

- (id)targetForAction:(SEL)action withSender:(id)sender
{
#define FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_action) \
if (action == @selector(_action:) && self.usesStandardContentView) \
return [_contentView targetForActionForWebView:action withSender:sender];

FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFont:sender)

#undef FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW

return [super targetForAction:action withSender:sender];
}

- (void)willFinishIgnoringCalloutBarFadeAfterPerformingAction
{
[_contentView willFinishIgnoringCalloutBarFadeAfterPerformingAction];
}

static inline CGFloat floorToDevicePixel(CGFloat input, float deviceScaleFactor)
{
return CGFloor(input * deviceScaleFactor) / deviceScaleFactor;
}

static inline bool pointsEqualInDevicePixels(CGPoint a, CGPoint b, float deviceScaleFactor)
{
return fabs(a.x * deviceScaleFactor - b.x * deviceScaleFactor) < std::numeric_limits<float>::epsilon()
&& fabs(a.y * deviceScaleFactor - b.y * deviceScaleFactor) < std::numeric_limits<float>::epsilon();
}

static CGSize roundScrollViewContentSize(const WebKit::WebPageProxy& page, CGSize contentSize)
{
float deviceScaleFactor = page.deviceScaleFactor();
return CGSizeMake(floorToDevicePixel(contentSize.width, deviceScaleFactor), floorToDevicePixel(contentSize.height, deviceScaleFactor));
}

- (UIView *)_currentContentView
{
return _customContentView ? [_customContentView web_contentView] : _contentView.get();
}

- (WKWebViewContentProviderRegistry *)_contentProviderRegistry
{
return [_configuration _contentProviderRegistry];
}

- (WKSelectionGranularity)_selectionGranularity
{
return [_configuration selectionGranularity];
}

- (void)_setHasCustomContentView:(BOOL)pageHasCustomContentView loadedMIMEType:(const WTF::String&)mimeType
{
Class representationClass = nil;
if (pageHasCustomContentView)
representationClass = [[_configuration _contentProviderRegistry] providerForMIMEType:mimeType];

if (pageHasCustomContentView && representationClass) {
[_customContentView removeFromSuperview];
[_customContentFixedOverlayView removeFromSuperview];

_customContentView = adoptNS([[representationClass alloc] web_initWithFrame:self.bounds webView:self mimeType:mimeType]);
_customContentFixedOverlayView = adoptNS([[UIView alloc] initWithFrame:self.bounds]);
[_customContentFixedOverlayView layer].name = @"CustomContentFixedOverlay";
[_customContentFixedOverlayView setUserInteractionEnabled:NO];

[[_contentView unscaledView] removeFromSuperview];
[_contentView removeFromSuperview];
[_scrollView addSubview:_customContentView.get()];
[self addSubview:_customContentFixedOverlayView.get()];

[_customContentView web_setMinimumSize:self.bounds.size];
[_customContentView web_setFixedOverlayView:_customContentFixedOverlayView.get()];

_scrollViewBackgroundColor = WebCore::Color();
[_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
[_scrollView _setScrollEnabledInternal:YES];

[self _setAvoidsUnsafeArea:NO];
} else if (_customContentView) {
[_customContentView removeFromSuperview];
_customContentView = nullptr;

[_customContentFixedOverlayView removeFromSuperview];
_customContentFixedOverlayView = nullptr;

[_scrollView addSubview:_contentView.get()];
[_scrollView addSubview:[_contentView unscaledView]];
[_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];

[_customContentFixedOverlayView setFrame:self.bounds];
[self addSubview:_customContentFixedOverlayView.get()];
}

if (self.isFirstResponder) {
UIView *currentContentView = self._currentContentView;
if (currentContentView == _contentView ? [_contentView canBecomeFirstResponderForWebView] : currentContentView.canBecomeFirstResponder)
[currentContentView becomeFirstResponder];
}
}

- (void)_didFinishLoadingDataForCustomContentProviderWithSuggestedFilename:(const String&)suggestedFilename data:(NSData *)data
{
ASSERT(_customContentView);
[_customContentView web_setContentProviderData:data suggestedFilename:suggestedFilename];

// FIXME: It may make more sense for custom content providers to invoke this when they're ready,
// because there's no guarantee that all custom content providers will lay out synchronously.
_page->didLayoutForCustomContentProvider();
}

- (void)_handleKeyUIEvent:(::UIEvent *)event
{
// We only want to handle key events from the hardware keyboard when we are
// first responder and a custom content view is installed; otherwise,
// WKContentView will be the first responder and expects to get key events directly.
if ([self isFirstResponder] && event._hidEvent) {
if ([_customContentView respondsToSelector:@selector(web_handleKeyEvent:)]) {
if ([_customContentView web_handleKeyEvent:event])
return;
}
}

[super _handleKeyUIEvent:event];
}

- (void)_willInvokeUIScrollViewDelegateCallback
{
_invokingUIScrollViewDelegateCallback = YES;
}

- (void)_didInvokeUIScrollViewDelegateCallback
{
_invokingUIScrollViewDelegateCallback = NO;
if (_didDeferUpdateVisibleContentRectsForUIScrollViewDelegateCallback) {
_didDeferUpdateVisibleContentRectsForUIScrollViewDelegateCallback = NO;
[self _scheduleVisibleContentRectUpdate];
}
}

static CGFloat contentZoomScale(WKWebView *webView)
{
CGFloat scale = webView._currentContentView.layer.affineTransform.a;
ASSERT(scale == [webView->_scrollView zoomScale]);
return scale;
}

static WebCore::Color baseScrollViewBackgroundColor(WKWebView *webView)
{
if (webView->_customContentView)
return [webView->_customContentView backgroundColor].CGColor;

if (webView->_gestureController) {
WebCore::Color color = webView->_gestureController->backgroundColorForCurrentSnapshot();
if (color.isValid())
return color;
}

if (!webView->_page)
return { };

return webView->_page->pageExtendedBackgroundColor();
}

static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
{
if (!webView.opaque)
return WebCore::Color::transparentBlack;

#if HAVE(OS_DARK_MODE_SUPPORT)
WebCore::LocalCurrentTraitCollection localTraitCollection(webView.traitCollection);
#endif

WebCore::Color color = baseScrollViewBackgroundColor(webView);

if (!color.isValid() && webView->_contentView)
color = [webView->_contentView backgroundColor].CGColor;

if (!color.isValid()) {
#if HAVE(OS_DARK_MODE_SUPPORT)
color = UIColor.systemBackgroundColor.CGColor;
#else
color = WebCore::Color::white;
#endif
}

CGFloat zoomScale = contentZoomScale(webView);
CGFloat minimumZoomScale = [webView->_scrollView minimumZoomScale];
if (zoomScale < minimumZoomScale) {
CGFloat slope = 12;
CGFloat opacity = std::max<CGFloat>(1 - slope * (minimumZoomScale - zoomScale), 0);
color = color.colorWithAlpha(opacity);
}

return color;
}

- (void)_updateScrollViewBackground
{
WebCore::Color color = scrollViewBackgroundColor(self);

if (_scrollViewBackgroundColor == color)
return;

_scrollViewBackgroundColor = color;

auto uiBackgroundColor = adoptNS([[UIColor alloc] initWithCGColor:cachedCGColor(color)]);
[_scrollView setBackgroundColor:uiBackgroundColor.get()];

// Update the indicator style based on the lightness/darkness of the background color.
if (color.lightness() <= .5f && color.isVisible())
[_scrollView setIndicatorStyle:UIScrollViewIndicatorStyleWhite];
else
[_scrollView setIndicatorStyle:UIScrollViewIndicatorStyleBlack];
}

- (void)_videoControlsManagerDidChange
{
#if ENABLE(FULLSCREEN_API)
if (_fullScreenWindowController)
[_fullScreenWindowController videoControlsManagerDidChange];
#endif
}

- (CGPoint)_initialContentOffsetForScrollView
{
auto combinedUnobscuredAndScrollViewInset = [self _computedContentInset];
return CGPointMake(-combinedUnobscuredAndScrollViewInset.left, -combinedUnobscuredAndScrollViewInset.top);
}

- (CGPoint)_contentOffsetAdjustedForObscuredInset:(CGPoint)point
{
CGPoint result = point;
UIEdgeInsets contentInset = [self _computedObscuredInset];

result.x -= contentInset.left;
result.y -= contentInset.top;

return result;
}

- (UIRectEdge)_effectiveObscuredInsetEdgesAffectedBySafeArea
{
if (![self usesStandardContentView])
return UIRectEdgeAll;
return _obscuredInsetEdgesAffectedBySafeArea;
}

- (UIEdgeInsets)_computedObscuredInsetForSafeBrowsingWarning
{
if (_haveSetObscuredInsets)
return _obscuredInsets;

#if PLATFORM(IOS)
return UIEdgeInsetsAdd(UIEdgeInsetsZero, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
#else
return UIEdgeInsetsZero;
#endif
}

- (UIEdgeInsets)_computedObscuredInset
{
if (!linkedOnOrAfter(WebCore::SDKVersion::FirstWhereScrollViewContentInsetsAreNotObscuringInsets)) {
// For binary compability with third party apps, treat scroll view content insets as obscuring insets when the app is compiled
// against a WebKit version without the fix in r229641.
return [self _computedContentInset];
}

if (_haveSetObscuredInsets)
return _obscuredInsets;

#if PLATFORM(IOS)
if (self._safeAreaShouldAffectObscuredInsets)
return UIEdgeInsetsAdd(UIEdgeInsetsZero, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
#endif

return UIEdgeInsetsZero;
}

- (UIEdgeInsets)_computedContentInset
{
if (_haveSetObscuredInsets)
return _obscuredInsets;

UIEdgeInsets insets = [_scrollView contentInset];

#if PLATFORM(IOS)
if (self._safeAreaShouldAffectObscuredInsets)
insets = UIEdgeInsetsAdd(insets, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
#endif

return insets;
}

- (UIEdgeInsets)_computedUnobscuredSafeAreaInset
{
if (_haveSetUnobscuredSafeAreaInsets)
return _unobscuredSafeAreaInsets;

#if PLATFORM(IOS)
if (!self._safeAreaShouldAffectObscuredInsets)
return self.safeAreaInsets;
#endif

return UIEdgeInsetsZero;
}

- (void)_processWillSwapOrDidExit
{
// FIXME: Which ones of these need to be done in the process swap case and which ones in the exit case?
[self _hidePasswordView];
[self _cancelAnimatedResize];

if (_gestureController)
_gestureController->disconnectFromProcess();

_viewportMetaTagWidth = WebCore::ViewportArguments::ValueAuto;
_initialScaleFactor = 1;
_hasCommittedLoadForMainFrame = NO;
_needsResetViewStateAfterCommitLoadForMainFrame = NO;
_dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
_waitingForEndAnimatedResize = NO;
_waitingForCommitAfterAnimatedResize = NO;
_animatedResizeOriginalContentWidth = 0;
[_contentView setHidden:NO];
_scrollOffsetToRestore = WTF::nullopt;
_unobscuredCenterToRestore = WTF::nullopt;
_scrollViewBackgroundColor = WebCore::Color();
_invokingUIScrollViewDelegateCallback = NO;
_didDeferUpdateVisibleContentRectsForUIScrollViewDelegateCallback = NO;
_didDeferUpdateVisibleContentRectsForAnyReason = NO;
_didDeferUpdateVisibleContentRectsForUnstableScrollView = NO;
_currentlyAdjustingScrollViewInsetsForKeyboard = NO;
_lastSentViewLayoutSize = WTF::nullopt;
_lastSentMaximumUnobscuredSize = WTF::nullopt;
_lastSentDeviceOrientation = WTF::nullopt;

_frozenVisibleContentRect = WTF::nullopt;
_frozenUnobscuredContentRect = WTF::nullopt;

_firstPaintAfterCommitLoadTransactionID = { };
_firstTransactionIDAfterPageRestore = WTF::nullopt;

_lastTransactionID = { };

_hasScheduledVisibleRectUpdate = NO;
_commitDidRestoreScrollPosition = NO;

_avoidsUnsafeArea = YES;
}

- (void)_processWillSwap
{
RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processWillSwap]", self);
[self _processWillSwapOrDidExit];
}

- (void)_processDidExit
{
RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processDidExit]", self);

[self _processWillSwapOrDidExit];

[_contentView setFrame:self.bounds];
[_scrollView setBackgroundColor:[_contentView backgroundColor]];
[_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
[_scrollView setZoomScale:1];
}

- (void)_didRelaunchProcess
{
RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didRelaunchProcess]", self);
_hasScheduledVisibleRectUpdate = NO;
_viewStabilityWhenVisibleContentRectUpdateScheduled = { };
if (_gestureController)
_gestureController->connectToProcess();
}

- (void)_didCommitLoadForMainFrame
{
_firstPaintAfterCommitLoadTransactionID = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();

_hasCommittedLoadForMainFrame = YES;
_needsResetViewStateAfterCommitLoadForMainFrame = YES;

[_scrollView _stopScrollingAndZoomingAnimations];
}

static CGPoint contentOffsetBoundedInValidRange(UIScrollView *scrollView, CGPoint contentOffset)
{
// FIXME: Likely we can remove this special case for watchOS and tvOS.
#if !PLATFORM(WATCHOS) && !PLATFORM(APPLETV)
UIEdgeInsets contentInsets = scrollView.adjustedContentInset;
#else
UIEdgeInsets contentInsets = scrollView.contentInset;
#endif

CGSize contentSize = scrollView.contentSize;
CGSize scrollViewSize = scrollView.bounds.size;

CGPoint minimumContentOffset = CGPointMake(-contentInsets.left, -contentInsets.top);
CGPoint maximumContentOffset = CGPointMake(std::max(minimumContentOffset.x, contentSize.width + contentInsets.right - scrollViewSize.width), std::max(minimumContentOffset.y, contentSize.height + contentInsets.bottom - scrollViewSize.height));

return CGPointMake(std::max(std::min(contentOffset.x, maximumContentOffset.x), minimumContentOffset.x), std::max(std::min(contentOffset.y, maximumContentOffset.y), minimumContentOffset.y));
}

static void changeContentOffsetBoundedInValidRange(UIScrollView *scrollView, WebCore::FloatPoint contentOffset)
{
scrollView.contentOffset = contentOffsetBoundedInValidRange(scrollView, contentOffset);
}

- (WebCore::FloatRect)visibleRectInViewCoordinates
{
WebCore::FloatRect bounds = self.bounds;
bounds.moveBy([_scrollView contentOffset]);
WebCore::FloatRect contentViewBounds = [_contentView bounds];
bounds.intersect(contentViewBounds);
return bounds;
}

- (void)_didCommitLayerTreeDuringAnimatedResize:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
{
auto updateID = layerTreeTransaction.dynamicViewportSizeUpdateID();
if (updateID && *updateID == _currentDynamicViewportSizeUpdateID) {
double pageScale = layerTreeTransaction.pageScaleFactor();
WebCore::IntPoint scrollPosition = layerTreeTransaction.scrollPosition();

CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
double currentTargetScale = animatingScaleTarget * [[_contentView layer] transform].m11;
double scale = pageScale / currentTargetScale;
_resizeAnimationTransformAdjustments = CATransform3DMakeScale(scale, scale, 1);

CGPoint newContentOffset = [self _contentOffsetAdjustedForObscuredInset:CGPointMake(scrollPosition.x() * pageScale, scrollPosition.y() * pageScale)];
CGPoint currentContentOffset = [_scrollView contentOffset];

_resizeAnimationTransformAdjustments.m41 = (currentContentOffset.x - newContentOffset.x) / animatingScaleTarget;
_resizeAnimationTransformAdjustments.m42 = (currentContentOffset.y - newContentOffset.y) / animatingScaleTarget;

[_resizeAnimationView layer].sublayerTransform = _resizeAnimationTransformAdjustments;

// If we've already passed endAnimatedResize, immediately complete
// the resize when we have an up-to-date layer tree. Otherwise,
// we will defer completion until endAnimatedResize.
_waitingForCommitAfterAnimatedResize = NO;
if (!_waitingForEndAnimatedResize)
[self _didCompleteAnimatedResize];

return;
}

// If a commit arrives during the live part of a resize but before the
// layer tree takes the current resize into account, it could change the
// WKContentView's size. Update the resizeAnimationView's scale to ensure
// we continue to fill the width of the resize target.

if (_waitingForEndAnimatedResize)
return;

auto newViewLayoutSize = [self activeViewLayoutSize:self.bounds];
CGFloat resizeAnimationViewScale = _animatedResizeOriginalContentWidth / newViewLayoutSize.width();
[[_resizeAnimationView layer] setSublayerTransform:CATransform3DMakeScale(resizeAnimationViewScale, resizeAnimationViewScale, 1)];
}

- (void)_trackTransactionCommit:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
{
if (_didDeferUpdateVisibleContentRectsForUnstableScrollView) {
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _didCommitLayerTree:] - received a commit (%llu) while deferring visible content rect updates (_dynamicViewportUpdateMode %d, _needsResetViewStateAfterCommitLoadForMainFrame %d (wants commit %llu), sizeChangedSinceLastVisibleContentRectUpdate %d, [_scrollView isZoomBouncing] %d, _currentlyAdjustingScrollViewInsetsForKeyboard %d)",
self, _page->identifier().toUInt64(), layerTreeTransaction.transactionID().toUInt64(), _dynamicViewportUpdateMode, _needsResetViewStateAfterCommitLoadForMainFrame, _firstPaintAfterCommitLoadTransactionID.toUInt64(), [_contentView sizeChangedSinceLastVisibleContentRectUpdate], [_scrollView isZoomBouncing], _currentlyAdjustingScrollViewInsetsForKeyboard);
}

if (_timeOfFirstVisibleContentRectUpdateWithPendingCommit) {
auto timeSinceFirstRequestWithPendingCommit = MonotonicTime::now() - *_timeOfFirstVisibleContentRectUpdateWithPendingCommit;
if (timeSinceFirstRequestWithPendingCommit > delayBeforeNoCommitsLogging)
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _didCommitLayerTree:] - finally received commit %.2fs after visible content rect update request; transactionID %llu", self, _page->identifier().toUInt64(), timeSinceFirstRequestWithPendingCommit.value(), layerTreeTransaction.transactionID().toUInt64());
_timeOfFirstVisibleContentRectUpdateWithPendingCommit = WTF::nullopt;
}
}

- (void)_updateScrollViewForTransaction:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
{
CGSize newContentSize = roundScrollViewContentSize(*_page, [_contentView frame].size);
[_scrollView _setContentSizePreservingContentOffsetDuringRubberband:newContentSize];

[_scrollView setMinimumZoomScale:layerTreeTransaction.minimumScaleFactor()];
[_scrollView setMaximumZoomScale:layerTreeTransaction.maximumScaleFactor()];
[_scrollView _setZoomEnabledInternal:layerTreeTransaction.allowsUserScaling()];

bool hasDockedInputView = !CGRectIsEmpty(_inputViewBounds);
bool isZoomed = layerTreeTransaction.pageScaleFactor() > layerTreeTransaction.initialScaleFactor();

bool scrollingNeededToRevealUI = false;
if (_maximumUnobscuredSizeOverride) {
auto unobscuredContentRect = _page->unobscuredContentRect();
auto maxUnobscuredSize = _page->maximumUnobscuredSize();
scrollingNeededToRevealUI = maxUnobscuredSize.width() == unobscuredContentRect.width() && maxUnobscuredSize.height() == unobscuredContentRect.height();
}

bool scrollingEnabled = _page->scrollingCoordinatorProxy()->hasScrollableOrZoomedMainFrame() || hasDockedInputView || isZoomed || scrollingNeededToRevealUI;
[_scrollView _setScrollEnabledInternal:scrollingEnabled];

if (!layerTreeTransaction.scaleWasSetByUIProcess() && ![_scrollView isZooming] && ![_scrollView isZoomBouncing] && ![_scrollView _isAnimatingZoom] && [_scrollView zoomScale] != layerTreeTransaction.pageScaleFactor()) {
LOG_WITH_STREAM(VisibleRects, stream << " updating scroll view with pageScaleFactor " << layerTreeTransaction.pageScaleFactor());
[_scrollView setZoomScale:layerTreeTransaction.pageScaleFactor()];
}
}

- (BOOL)_restoreScrollAndZoomStateForTransaction:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
{
if (!_firstTransactionIDAfterPageRestore || layerTreeTransaction.transactionID() < _firstTransactionIDAfterPageRestore.value())
return NO;

_firstTransactionIDAfterPageRestore = WTF::nullopt;

BOOL needUpdateVisibleContentRects = NO;

if (_scrollOffsetToRestore) {
WebCore::FloatPoint scaledScrollOffset = _scrollOffsetToRestore.value();
_scrollOffsetToRestore = WTF::nullopt;

if (WTF::areEssentiallyEqual<float>(contentZoomScale(self), _scaleToRestore)) {
scaledScrollOffset.scale(_scaleToRestore);
WebCore::FloatPoint contentOffsetInScrollViewCoordinates = scaledScrollOffset - WebCore::FloatSize(_obscuredInsetsWhenSaved.left(), _obscuredInsetsWhenSaved.top());

changeContentOffsetBoundedInValidRange(_scrollView.get(), contentOffsetInScrollViewCoordinates);
_commitDidRestoreScrollPosition = YES;
}

needUpdateVisibleContentRects = YES;
}

if (_unobscuredCenterToRestore) {
WebCore::FloatPoint unobscuredCenterToRestore = _unobscuredCenterToRestore.value();
_unobscuredCenterToRestore = WTF::nullopt;

if (WTF::areEssentiallyEqual<float>(contentZoomScale(self), _scaleToRestore)) {
CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, _obscuredInsets);
WebCore::FloatSize unobscuredContentSizeAtNewScale = WebCore::FloatSize(unobscuredRect.size) / _scaleToRestore;
WebCore::FloatPoint topLeftInDocumentCoordinates = unobscuredCenterToRestore - unobscuredContentSizeAtNewScale / 2;

topLeftInDocumentCoordinates.scale(_scaleToRestore);
topLeftInDocumentCoordinates.moveBy(WebCore::FloatPoint(-_obscuredInsets.left, -_obscuredInsets.top));

changeContentOffsetBoundedInValidRange(_scrollView.get(), topLeftInDocumentCoordinates);
}

needUpdateVisibleContentRects = YES;
}

if (_gestureController)
_gestureController->didRestoreScrollPosition();

return needUpdateVisibleContentRects;
}

- (void)_didCommitLayerTree:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
{
[self _trackTransactionCommit:layerTreeTransaction];

_lastTransactionID = layerTreeTransaction.transactionID();

if (![self usesStandardContentView])
return;

LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->identifier() << " _didCommitLayerTree:] transactionID " << layerTreeTransaction.transactionID() << " _dynamicViewportUpdateMode " << (int)_dynamicViewportUpdateMode);

bool needUpdateVisibleContentRects = _page->updateLayoutViewportParameters(layerTreeTransaction);

if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing) {
[self _didCommitLayerTreeDuringAnimatedResize:layerTreeTransaction];
return;
}

if (_resizeAnimationView)
RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didCommitLayerTree:] - dynamicViewportUpdateMode is NotResizing, but still have a live resizeAnimationView (unpaired begin/endAnimatedResize?)", self);

[self _updateScrollViewForTransaction:layerTreeTransaction];

_viewportMetaTagWidth = layerTreeTransaction.viewportMetaTagWidth();
_viewportMetaTagWidthWasExplicit = layerTreeTransaction.viewportMetaTagWidthWasExplicit();
_viewportMetaTagCameFromImageDocument = layerTreeTransaction.viewportMetaTagCameFromImageDocument();
_initialScaleFactor = layerTreeTransaction.initialScaleFactor();

if (_page->inStableState() && layerTreeTransaction.isInStableState() && [_stableStatePresentationUpdateCallbacks count]) {
for (dispatch_block_t action in _stableStatePresentationUpdateCallbacks.get())
action();

[_stableStatePresentationUpdateCallbacks removeAllObjects];
_stableStatePresentationUpdateCallbacks = nil;
}

if (![_contentView _mayDisableDoubleTapGesturesDuringSingleTap])
[_contentView _setDoubleTapGesturesEnabled:self._allowsDoubleTapGestures];

[self _updateScrollViewBackground];
[self _setAvoidsUnsafeArea:layerTreeTransaction.avoidsUnsafeArea()];

if (_gestureController)
_gestureController->setRenderTreeSize(layerTreeTransaction.renderTreeSize());

if (_needsResetViewStateAfterCommitLoadForMainFrame && layerTreeTransaction.transactionID() >= _firstPaintAfterCommitLoadTransactionID) {
_needsResetViewStateAfterCommitLoadForMainFrame = NO;
[_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
if (_observedRenderingProgressEvents & _WKRenderingProgressEventFirstPaint)
_navigationState->didFirstPaint();

needUpdateVisibleContentRects = true;
}

if ([self _restoreScrollAndZoomStateForTransaction:layerTreeTransaction])
needUpdateVisibleContentRects = true;

if (needUpdateVisibleContentRects)
[self _scheduleVisibleContentRectUpdate];

if (WebKit::RemoteLayerTreeScrollingPerformanceData* scrollPerfData = _page->scrollingPerformanceData())
scrollPerfData->didCommitLayerTree([self visibleRectInViewCoordinates]);
}

- (void)_layerTreeCommitComplete
{
_commitDidRestoreScrollPosition = NO;
}

- (void)_couldNotRestorePageState
{
// The gestureController may be waiting for the scroll position to be restored
// in order to remove the swipe snapshot. Since the scroll position could not be
// restored, tell the gestureController it was restored so that it no longer waits
// for it.
if (_gestureController)
_gestureController->didRestoreScrollPosition();
}

- (void)_restorePageScrollPosition:(Optional<WebCore::FloatPoint>)scrollPosition scrollOrigin:(WebCore::FloatPoint)scrollOrigin previousObscuredInset:(WebCore::FloatBoxExtent)obscuredInsets scale:(double)scale
{
if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing) {
// Defer scroll position restoration until after the current resize completes.
RetainPtr<WKWebView> retainedSelf = self;
_callbacksDeferredDuringResize.append([retainedSelf, scrollPosition, scrollOrigin, obscuredInsets, scale] {
[retainedSelf _restorePageScrollPosition:scrollPosition scrollOrigin:scrollOrigin previousObscuredInset:obscuredInsets scale:scale];
});
return;
}

if (![self usesStandardContentView])
return;

_firstTransactionIDAfterPageRestore = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
if (scrollPosition)
_scrollOffsetToRestore = WebCore::ScrollableArea::scrollOffsetFromPosition(WebCore::FloatPoint(scrollPosition.value()), WebCore::toFloatSize(scrollOrigin));
else
_scrollOffsetToRestore = WTF::nullopt;

_obscuredInsetsWhenSaved = obscuredInsets;
_scaleToRestore = scale;
}

- (void)_restorePageStateToUnobscuredCenter:(Optional<WebCore::FloatPoint>)center scale:(double)scale
{
if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing) {
// Defer scroll position restoration until after the current resize completes.
RetainPtr<WKWebView> retainedSelf = self;
_callbacksDeferredDuringResize.append([retainedSelf, center, scale] {
[retainedSelf _restorePageStateToUnobscuredCenter:center scale:scale];
});
return;
}

if (![self usesStandardContentView])
return;

_firstTransactionIDAfterPageRestore = downcast<WebKit::RemoteLayerTreeDrawingAreaProxy>(*_page->drawingArea()).nextLayerTreeTransactionID();
_unobscuredCenterToRestore = center;

_scaleToRestore = scale;
}

- (RefPtr<WebKit::ViewSnapshot>)_takeViewSnapshot
{
#if HAVE(CORE_ANIMATION_RENDER_SERVER)
float deviceScale = WebCore::screenScaleFactor();
WebCore::FloatSize snapshotSize(self.bounds.size);
snapshotSize.scale(deviceScale);

CATransform3D transform = CATransform3DMakeScale(deviceScale, deviceScale, 1);

#if HAVE(IOSURFACE_RGB10)
WebCore::IOSurface::Format snapshotFormat = WebCore::screenSupportsExtendedColor() ? WebCore::IOSurface::Format::RGB10 : WebCore::IOSurface::Format::BGRA;
#else
WebCore::IOSurface::Format snapshotFormat = WebCore::IOSurface::Format::BGRA;
#endif
auto surface = WebCore::IOSurface::create(WebCore::expandedIntSize(snapshotSize), WebCore::sRGBColorSpaceRef(), snapshotFormat);
if (!surface)
return nullptr;
CARenderServerRenderLayerWithTransform(MACH_PORT_NULL, self.layer.context.contextId, reinterpret_cast<uint64_t>(self.layer), surface->surface(), 0, 0, &transform);

#if HAVE(IOSURFACE_ACCELERATOR)
WebCore::IOSurface::Format compressedFormat = WebCore::IOSurface::Format::YUV422;
if (WebCore::IOSurface::allowConversionFromFormatToFormat(snapshotFormat, compressedFormat)) {
auto viewSnapshot = WebKit::ViewSnapshot::create(nullptr);
WebCore::IOSurface::convertToFormat(WTFMove(surface), WebCore::IOSurface::Format::YUV422, [viewSnapshot](std::unique_ptr<WebCore::IOSurface> convertedSurface) {
if (convertedSurface)
viewSnapshot->setSurface(WTFMove(convertedSurface));
});

return viewSnapshot;
}
#endif // HAVE(IOSURFACE_ACCELERATOR)

return WebKit::ViewSnapshot::create(WTFMove(surface));
#else // HAVE(CORE_ANIMATION_RENDER_SERVER)
return nullptr;
#endif
}

- (void)_zoomToPoint:(WebCore::FloatPoint)point atScale:(double)scale animated:(BOOL)animated
{
CFTimeInterval duration = 0;
CGFloat zoomScale = contentZoomScale(self);

if (animated) {
const double maximumZoomDuration = 0.4;
const double minimumZoomDuration = 0.1;
const double zoomDurationFactor = 0.3;

duration = std::min(fabs(log(zoomScale) - log(scale)) * zoomDurationFactor + minimumZoomDuration, maximumZoomDuration);
}

if (scale != zoomScale)
_page->willStartUserTriggeredZooming();

LOG_WITH_STREAM(VisibleRects, stream << "_zoomToPoint:" << point << " scale: " << scale << " duration:" << duration);

[_scrollView _zoomToCenter:point scale:scale duration:duration];
}

- (void)_zoomToRect:(WebCore::FloatRect)targetRect atScale:(double)scale origin:(WebCore::FloatPoint)origin animated:(BOOL)animated
{
// FIXME: Some of this could be shared with _scrollToRect.
const double visibleRectScaleChange = contentZoomScale(self) / scale;
const WebCore::FloatRect visibleRect([self convertRect:self.bounds toView:self._currentContentView]);
const WebCore::FloatRect unobscuredRect([self _contentRectForUserInteraction]);

const WebCore::FloatSize topLeftObscuredInsetAfterZoom((unobscuredRect.minXMinYCorner() - visibleRect.minXMinYCorner()) * visibleRectScaleChange);
const WebCore::FloatSize bottomRightObscuredInsetAfterZoom((visibleRect.maxXMaxYCorner() - unobscuredRect.maxXMaxYCorner()) * visibleRectScaleChange);

const WebCore::FloatSize unobscuredRectSizeAfterZoom(unobscuredRect.size() * visibleRectScaleChange);

// Center to the target rect.
WebCore::FloatPoint unobscuredRectLocationAfterZoom = targetRect.location() - (unobscuredRectSizeAfterZoom - targetRect.size()) * 0.5;

// Center to the tap point instead in case the target rect won't fit in a direction.
if (targetRect.width() > unobscuredRectSizeAfterZoom.width())
unobscuredRectLocationAfterZoom.setX(origin.x() - unobscuredRectSizeAfterZoom.width() / 2);
if (targetRect.height() > unobscuredRectSizeAfterZoom.height())
unobscuredRectLocationAfterZoom.setY(origin.y() - unobscuredRectSizeAfterZoom.height() / 2);

// We have computed where we want the unobscured rect to be. Now adjust for the obscuring insets.
WebCore::FloatRect visibleRectAfterZoom(unobscuredRectLocationAfterZoom, unobscuredRectSizeAfterZoom);
visibleRectAfterZoom.move(-topLeftObscuredInsetAfterZoom);
visibleRectAfterZoom.expand(topLeftObscuredInsetAfterZoom + bottomRightObscuredInsetAfterZoom);

[self _zoomToPoint:visibleRectAfterZoom.center() atScale:scale animated:animated];
}

static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOffset, WebCore::FloatSize contentSize, WebCore::FloatSize unobscuredContentSize)
{
WebCore::FloatSize maximumContentOffset = contentSize - unobscuredContentSize;
return contentOffset.constrainedBetween(WebCore::FloatPoint(), WebCore::FloatPoint(maximumContentOffset));
}

- (void)_scrollToContentScrollPosition:(WebCore::FloatPoint)scrollPosition scrollOrigin:(WebCore::IntPoint)scrollOrigin
{
if (_commitDidRestoreScrollPosition || _dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
return;

// Don't allow content to do programmatic scrolls for non-scrollable pages when zoomed.
if (!_page->scrollingCoordinatorProxy()->hasScrollableMainFrame() && ([_scrollView zoomScale] > [_scrollView minimumZoomScale] || [_scrollView zoomScale] < [_scrollView minimumZoomScale])) {
[self _scheduleForcedVisibleContentRectUpdate];
return;
}

WebCore::FloatPoint contentOffset = WebCore::ScrollableArea::scrollOffsetFromPosition(scrollPosition, toFloatSize(scrollOrigin));

WebCore::FloatPoint scaledOffset = contentOffset;
CGFloat zoomScale = contentZoomScale(self);
scaledOffset.scale(zoomScale);

CGPoint contentOffsetInScrollViewCoordinates = [self _contentOffsetAdjustedForObscuredInset:scaledOffset];
contentOffsetInScrollViewCoordinates = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffsetInScrollViewCoordinates);

[_scrollView _stopScrollingAndZoomingAnimations];

if (!CGPointEqualToPoint(contentOffsetInScrollViewCoordinates, [_scrollView contentOffset]))
[_scrollView setContentOffset:contentOffsetInScrollViewCoordinates];
else {
// If we haven't changed anything, there would not be any VisibleContentRect update sent to the content.
// The WebProcess would keep the invalid contentOffset as its scroll position.
// To synchronize the WebProcess with what is on screen, we send the VisibleContentRect again.
_page->resendLastVisibleContentRects();
}
}

- (BOOL)_scrollToRect:(WebCore::FloatRect)targetRect origin:(WebCore::FloatPoint)origin minimumScrollDistance:(float)minimumScrollDistance
{
if (![_scrollView isScrollEnabled])
return NO;

WebCore::FloatRect unobscuredContentRect([self _contentRectForUserInteraction]);
WebCore::FloatPoint unobscuredContentOffset = unobscuredContentRect.location();
WebCore::FloatSize contentSize([self._currentContentView bounds].size);

// Center the target rect in the scroll view.
// If the target doesn't fit in the scroll view, center on the gesture location instead.
WebCore::FloatPoint newUnobscuredContentOffset;
if (targetRect.width() <= unobscuredContentRect.width())
newUnobscuredContentOffset.setX(targetRect.x() - (unobscuredContentRect.width() - targetRect.width()) / 2);
else
newUnobscuredContentOffset.setX(origin.x() - unobscuredContentRect.width() / 2);
if (targetRect.height() <= unobscuredContentRect.height())
newUnobscuredContentOffset.setY(targetRect.y() - (unobscuredContentRect.height() - targetRect.height()) / 2);
else
newUnobscuredContentOffset.setY(origin.y() - unobscuredContentRect.height() / 2);
newUnobscuredContentOffset = constrainContentOffset(newUnobscuredContentOffset, contentSize, unobscuredContentRect.size());

if (unobscuredContentOffset == newUnobscuredContentOffset) {
if (targetRect.width() > unobscuredContentRect.width())
newUnobscuredContentOffset.setX(origin.x() - unobscuredContentRect.width() / 2);
if (targetRect.height() > unobscuredContentRect.height())
newUnobscuredContentOffset.setY(origin.y() - unobscuredContentRect.height() / 2);
newUnobscuredContentOffset = constrainContentOffset(newUnobscuredContentOffset, contentSize, unobscuredContentRect.size());
}

WebCore::FloatSize scrollViewOffsetDelta = newUnobscuredContentOffset - unobscuredContentOffset;
scrollViewOffsetDelta.scale(contentZoomScale(self));

float scrollDistance = scrollViewOffsetDelta.diagonalLength();
if (scrollDistance < minimumScrollDistance)
return NO;

[_contentView willStartZoomOrScroll];

LOG_WITH_STREAM(VisibleRects, stream << "_scrollToRect: scrolling to " << [_scrollView contentOffset] + scrollViewOffsetDelta);

[_scrollView setContentOffset:([_scrollView contentOffset] + scrollViewOffsetDelta) animated:YES];
return YES;
}

- (void)_zoomOutWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
{
[self _zoomToPoint:origin atScale:[_scrollView minimumZoomScale] animated:animated];
}

- (void)_zoomToInitialScaleWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
{
ASSERT(_initialScaleFactor > 0);
[self _zoomToPoint:origin atScale:_initialScaleFactor animated:animated];
}

- (BOOL)_selectionRectIsFullyVisibleAndNonEmpty
{
auto rect = _page->selectionBoundingRectInRootViewCoordinates();
return !rect.isEmpty() && CGRectContainsRect(self._contentRectForUserInteraction, rect);
}

- (void)_scrollToAndRevealSelectionIfNeeded
{
if (![_scrollView isScrollEnabled])
return;

auto selectionRect = _page->selectionBoundingRectInRootViewCoordinates();
constexpr CGFloat selectionRectPadding = 4;
selectionRect.inflate(selectionRectPadding);
selectionRect.intersect([_contentView bounds]);
if (selectionRect.isEmpty())
return;

WebCore::FloatRect userInteractionContentRect = self._contentRectForUserInteraction;
auto scrollDeltaInContentCoordinates = CGSizeZero;

if (userInteractionContentRect.maxY() < selectionRect.maxY())
scrollDeltaInContentCoordinates.height = selectionRect.maxY() - userInteractionContentRect.maxY();
else if (userInteractionContentRect.y() > selectionRect.y())
scrollDeltaInContentCoordinates.height = selectionRect.y() - userInteractionContentRect.y();

if (userInteractionContentRect.maxX() < selectionRect.maxX())
scrollDeltaInContentCoordinates.width = selectionRect.maxX() - userInteractionContentRect.maxX();
else if (userInteractionContentRect.x() > selectionRect.x())
scrollDeltaInContentCoordinates.width = selectionRect.x() - userInteractionContentRect.x();

if (CGSizeEqualToSize(scrollDeltaInContentCoordinates, CGSizeZero))
return;

auto scale = contentZoomScale(self);
auto newContentOffset = [_scrollView contentOffset];
newContentOffset.x += scrollDeltaInContentCoordinates.width * scale;
newContentOffset.y += scrollDeltaInContentCoordinates.height * scale;
[_scrollView setContentOffset:newContentOffset animated:YES];
}

- (void)_zoomToFocusRect:(const WebCore::FloatRect&)focusedElementRectInDocumentCoordinates selectionRect:(const WebCore::FloatRect&)selectionRectInDocumentCoordinates
fontSize:(float)fontSize minimumScale:(double)minimumScale maximumScale:(double)maximumScale allowScaling:(BOOL)allowScaling forceScroll:(BOOL)forceScroll
{
LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect:" << focusedElementRectInDocumentCoordinates << " selectionRect:" << selectionRectInDocumentCoordinates);

const double minimumHeightToShowContentAboveKeyboard = 106;
const CFTimeInterval formControlZoomAnimationDuration = 0.25;
const double caretOffsetFromWindowEdge = 8;

UIWindow *window = [_scrollView window];

// Find the portion of the view that is visible on the screen.
UIViewController *topViewController = [[[_scrollView _viewControllerForAncestor] _rootAncestorViewController] _viewControllerForSupportedInterfaceOrientations];
UIView *fullScreenView = topViewController.view;
if (!fullScreenView)
fullScreenView = window;

CGRect unobscuredScrollViewRectInWebViewCoordinates = UIEdgeInsetsInsetRect([self bounds], _obscuredInsets);
CGRect visibleScrollViewBoundsInWebViewCoordinates = CGRectIntersection(unobscuredScrollViewRectInWebViewCoordinates, [fullScreenView convertRect:[fullScreenView bounds] toView:self]);
CGRect formAssistantFrameInWebViewCoordinates = [window convertRect:_inputViewBounds toView:self];
CGRect intersectionBetweenScrollViewAndFormAssistant = CGRectIntersection(visibleScrollViewBoundsInWebViewCoordinates, formAssistantFrameInWebViewCoordinates);
CGSize visibleSize = visibleScrollViewBoundsInWebViewCoordinates.size;

CGFloat visibleOffsetFromTop = 0;
CGFloat minimumDistanceFromKeyboardToTriggerScroll = 0;
if (!CGRectIsEmpty(intersectionBetweenScrollViewAndFormAssistant)) {
CGFloat heightVisibleAboveFormAssistant = CGRectGetMinY(intersectionBetweenScrollViewAndFormAssistant) - CGRectGetMinY(visibleScrollViewBoundsInWebViewCoordinates);
CGFloat heightVisibleBelowFormAssistant = CGRectGetMaxY(visibleScrollViewBoundsInWebViewCoordinates) - CGRectGetMaxY(intersectionBetweenScrollViewAndFormAssistant);

if (heightVisibleAboveFormAssistant >= minimumHeightToShowContentAboveKeyboard || heightVisibleBelowFormAssistant < heightVisibleAboveFormAssistant) {
visibleSize.height = heightVisibleAboveFormAssistant;
minimumDistanceFromKeyboardToTriggerScroll = 50;
} else {
visibleSize.height = heightVisibleBelowFormAssistant;
visibleOffsetFromTop = CGRectGetMaxY(intersectionBetweenScrollViewAndFormAssistant) - CGRectGetMinY(visibleScrollViewBoundsInWebViewCoordinates);
}
}

// Zoom around the element's bounding frame. We use a "standard" size to determine the proper frame.
double currentScale = contentZoomScale(self);
double scale = currentScale;
if (allowScaling) {
#if PLATFORM(WATCHOS)
const CGFloat minimumMarginForZoomingToEntireFocusRectInWebViewCoordinates = 10;
const CGFloat maximumMarginForZoomingToEntireFocusRectInWebViewCoordinates = 35;

CGRect minimumTargetRectInDocumentCoordinates = UIRectInsetEdges(focusedElementRectInDocumentCoordinates, UIRectEdgeAll, -minimumMarginForZoomingToEntireFocusRectInWebViewCoordinates / currentScale);
CGRect maximumTargetRectInDocumentCoordinates = UIRectInsetEdges(focusedElementRectInDocumentCoordinates, UIRectEdgeAll, -maximumMarginForZoomingToEntireFocusRectInWebViewCoordinates / currentScale);

double clampedMaximumTargetScale = clampTo<double>(std::min(visibleSize.width / CGRectGetWidth(minimumTargetRectInDocumentCoordinates), visibleSize.height / CGRectGetHeight(minimumTargetRectInDocumentCoordinates)), minimumScale, maximumScale);
double clampedMinimumTargetScale = clampTo<double>(std::min(visibleSize.width / CGRectGetWidth(maximumTargetRectInDocumentCoordinates), visibleSize.height / CGRectGetHeight(maximumTargetRectInDocumentCoordinates)), minimumScale, maximumScale);
scale = clampTo<double>(currentScale, clampedMinimumTargetScale, clampedMaximumTargetScale);
#else
const double webViewStandardFontSize = 16;
scale = clampTo<double>(webViewStandardFontSize / fontSize, minimumScale, maximumScale);
#endif
}

CGFloat documentWidth = [_contentView bounds].size.width;
scale = CGRound(documentWidth * scale) / documentWidth;

WebCore::FloatRect focusedElementRectInNewScale = focusedElementRectInDocumentCoordinates;
focusedElementRectInNewScale.scale(scale);
focusedElementRectInNewScale.moveBy([_contentView frame].origin);

BOOL selectionRectIsNotNull = !selectionRectInDocumentCoordinates.isZero();
BOOL doNotScrollWhenContentIsAlreadyVisible = !forceScroll || [_contentView _shouldAvoidScrollingWhenFocusedContentIsVisible];
if (doNotScrollWhenContentIsAlreadyVisible) {
CGRect currentlyVisibleRegionInWebViewCoordinates;
currentlyVisibleRegionInWebViewCoordinates.origin = unobscuredScrollViewRectInWebViewCoordinates.origin;
currentlyVisibleRegionInWebViewCoordinates.origin.y += visibleOffsetFromTop;
currentlyVisibleRegionInWebViewCoordinates.size = visibleSize;
currentlyVisibleRegionInWebViewCoordinates.size.height -= minimumDistanceFromKeyboardToTriggerScroll;

// Don't bother scrolling if the entire node is already visible, whether or not we got a selectionRect.
if (CGRectContainsRect(currentlyVisibleRegionInWebViewCoordinates, [self convertRect:focusedElementRectInDocumentCoordinates fromView:_contentView.get()]))
return;

// Don't bother scrolling if we have a valid selectionRect and it is already visible.
if (selectionRectIsNotNull && CGRectContainsRect(currentlyVisibleRegionInWebViewCoordinates, [self convertRect:selectionRectInDocumentCoordinates fromView:_contentView.get()]))
return;
}

// We want to center the focused element within the viewport, with as much spacing on all sides as
// we can get based on the visible area after zooming. The spacing in either dimension is half the
// difference between the size of the DOM node and the size of the visible frame.
// If the element is too wide to be horizontally centered or too tall to be vertically centered, we
// instead scroll such that the left edge or top edge of the element is within the left half or top
// half of the viewport, respectively.
CGFloat horizontalSpaceInWebViewCoordinates = (visibleSize.width - focusedElementRectInNewScale.width()) / 2.0;
CGFloat verticalSpaceInWebViewCoordinates = (visibleSize.height - focusedElementRectInNewScale.height()) / 2.0;

auto topLeft = CGPointZero;
auto scrollViewInsets = [_scrollView _effectiveContentInset];
auto currentTopLeft = [_scrollView contentOffset];

if (_haveSetObscuredInsets) {
currentTopLeft.x += _obscuredInsets.left;
currentTopLeft.y += _obscuredInsets.top;
}

if (horizontalSpaceInWebViewCoordinates > 0)
topLeft.x = focusedElementRectInNewScale.x() - horizontalSpaceInWebViewCoordinates;
else {
auto minimumOffsetToRevealLeftEdge = std::max(-scrollViewInsets.left, focusedElementRectInNewScale.x() - visibleSize.width / 2);
auto maximumOffsetToRevealLeftEdge = focusedElementRectInNewScale.x();
topLeft.x = clampTo<double>(currentTopLeft.x, minimumOffsetToRevealLeftEdge, maximumOffsetToRevealLeftEdge);
}

if (verticalSpaceInWebViewCoordinates > 0)
topLeft.y = focusedElementRectInNewScale.y() - verticalSpaceInWebViewCoordinates;
else {
auto minimumOffsetToRevealTopEdge = std::max(-scrollViewInsets.top, focusedElementRectInNewScale.y() - visibleSize.height / 2);
auto maximumOffsetToRevealTopEdge = focusedElementRectInNewScale.y();
topLeft.y = clampTo<double>(currentTopLeft.y, minimumOffsetToRevealTopEdge, maximumOffsetToRevealTopEdge);
}

topLeft.y -= visibleOffsetFromTop;

WebCore::FloatRect documentBoundsInNewScale = [_contentView bounds];
documentBoundsInNewScale.scale(scale);
documentBoundsInNewScale.moveBy([_contentView frame].origin);

CGFloat minimumAllowableHorizontalOffsetInWebViewCoordinates = -INFINITY;
CGFloat minimumAllowableVerticalOffsetInWebViewCoordinates = -INFINITY;
CGFloat maximumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(documentBoundsInNewScale) - visibleSize.width;
CGFloat maximumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(documentBoundsInNewScale) - visibleSize.height;

if (selectionRectIsNotNull) {
WebCore::FloatRect selectionRectInNewScale = selectionRectInDocumentCoordinates;
selectionRectInNewScale.scale(scale);
selectionRectInNewScale.moveBy([_contentView frame].origin);
// Adjust the min and max allowable scroll offsets, such that the selection rect remains visible.
minimumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.width;
minimumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.height - visibleOffsetFromTop;
maximumAllowableHorizontalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableHorizontalOffsetInWebViewCoordinates, CGRectGetMinX(selectionRectInNewScale) - caretOffsetFromWindowEdge);
maximumAllowableVerticalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableVerticalOffsetInWebViewCoordinates, CGRectGetMinY(selectionRectInNewScale) - caretOffsetFromWindowEdge - visibleOffsetFromTop);
}

// Constrain the left edge in document coordinates so that:
// - it isn't so small that the scrollVisibleRect isn't visible on the screen
// - it isn't so great that the document's right edge is less than the right edge of the screen
topLeft.x = clampTo<CGFloat>(topLeft.x, minimumAllowableHorizontalOffsetInWebViewCoordinates, maximumAllowableHorizontalOffsetInWebViewCoordinates);

// Constrain the top edge in document coordinates so that:
// - it isn't so small that the scrollVisibleRect isn't visible on the screen
// - it isn't so great that the document's bottom edge is higher than the top of the form assistant
topLeft.y = clampTo<CGFloat>(topLeft.y, minimumAllowableVerticalOffsetInWebViewCoordinates, maximumAllowableVerticalOffsetInWebViewCoordinates);

if (_haveSetObscuredInsets) {
// This looks unintuitive, but is necessary in order to precisely center the focused element in the visible area.
// The top left position already accounts for top and left obscured insets - i.e., a topLeft of (0, 0) corresponds
// to the top- and left-most point below (and to the right of) the top inset area and left inset areas, respectively.
// However, when telling WKScrollView to scroll to a given center position, this center position is computed relative
// to the coordinate space of the scroll view. Thus, to compute our center position from the top left position, we
// need to first move the top left position up and to the left, and then add half the width and height of the content
// area (including obscured insets).
topLeft.x -= _obscuredInsets.left;
topLeft.y -= _obscuredInsets.top;
}

WebCore::FloatPoint newCenter = CGPointMake(topLeft.x + CGRectGetWidth(self.bounds) / 2, topLeft.y + CGRectGetHeight(self.bounds) / 2);

if (scale != currentScale)
_page->willStartUserTriggeredZooming();

LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect: zooming to " << newCenter << " scale:" << scale);

// The newCenter has been computed in the new scale, but _zoomToCenter expected the center to be in the original scale.
newCenter.scale(1 / scale);
[_scrollView _zoomToCenter:newCenter scale:scale duration:formControlZoomAnimationDuration force:YES];
}

- (double)_initialScaleFactor
{
return _initialScaleFactor;
}

- (double)_contentZoomScale
{
return contentZoomScale(self);
}

- (double)_targetContentZoomScaleForRect:(const WebCore::FloatRect&)targetRect currentScale:(double)currentScale fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale
{
WebCore::FloatSize unobscuredContentSize([self _contentRectForUserInteraction].size);
double horizontalScale = unobscuredContentSize.width() * currentScale / targetRect.width();
double verticalScale = unobscuredContentSize.height() * currentScale / targetRect.height();

horizontalScale = std::min(std::max(horizontalScale, minimumScale), maximumScale);
verticalScale = std::min(std::max(verticalScale, minimumScale), maximumScale);

return fitEntireRect ? std::min(horizontalScale, verticalScale) : horizontalScale;
}

- (BOOL)_zoomToRect:(WebCore::FloatRect)targetRect withOrigin:(WebCore::FloatPoint)origin fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale minimumScrollDistance:(float)minimumScrollDistance
{
const float maximumScaleFactorDeltaForPanScroll = 0.02;

double currentScale = contentZoomScale(self);
double targetScale = [self _targetContentZoomScaleForRect:targetRect currentScale:currentScale fitEntireRect:fitEntireRect minimumScale:minimumScale maximumScale:maximumScale];

if (fabs(targetScale - currentScale) < maximumScaleFactorDeltaForPanScroll) {
if ([self _scrollToRect:targetRect origin:origin minimumScrollDistance:minimumScrollDistance])
return true;
} else if (targetScale != currentScale) {
[self _zoomToRect:targetRect atScale:targetScale origin:origin animated:YES];
return true;
}

return false;
}

- (void)didMoveToWindow
{
if (!_overridesInterfaceOrientation)
[self _dispatchSetDeviceOrientation:[self _deviceOrientation]];
_page->activityStateDidChange(WebCore::ActivityState::allFlags());
_page->webViewDidMoveToWindow();
}

- (void)_setOpaqueInternal:(BOOL)opaque
{
[super setOpaque:opaque];

[_contentView setOpaque:opaque];

if (!_page)
return;

Optional<WebCore::Color> backgroundColor;
if (!opaque)
backgroundColor = WebCore::Color(WebCore::Color::transparentBlack);
_page->setBackgroundColor(backgroundColor);

[self _updateScrollViewBackground];
}

- (void)setOpaque:(BOOL)opaque
{
if (opaque == self.opaque)
return;

[self _setOpaqueInternal:opaque];
}

- (void)setBackgroundColor:(UIColor *)backgroundColor
{
[super setBackgroundColor:backgroundColor];
[_contentView setBackgroundColor:backgroundColor];
[self _updateScrollViewBackground];
}

- (BOOL)_allowsDoubleTapGestures
{
if (_fastClickingIsDisabled)
return YES;

// If the page is not user scalable, we don't allow double tap gestures.
if (![_scrollView isZoomEnabled] || [_scrollView minimumZoomScale] >= [_scrollView maximumZoomScale])
return NO;

// If the viewport width was not explicit, we allow double tap gestures.
if (!_viewportMetaTagWidthWasExplicit || _viewportMetaTagCameFromImageDocument)
return YES;

// If the page set a viewport width that wasn't the device width, then it was
// scaled and thus will probably need to zoom.
if (_viewportMetaTagWidth != WebCore::ViewportArguments::ValueDeviceWidth)
return YES;

// At this point, we have a page that asked for width = device-width. However,
// if the content's width and height were large, we might have had to shrink it.
// We'll enable double tap zoom whenever we're not at the actual initial scale.
return !WTF::areEssentiallyEqual<float>(contentZoomScale(self), _initialScaleFactor);
}

#pragma mark UIScrollViewDelegate

- (BOOL)usesStandardContentView
{
return !_customContentView && !_passwordView;
}

- (CGSize)scrollView:(UIScrollView*)scrollView contentSizeForZoomScale:(CGFloat)scale withProposedSize:(CGSize)proposedSize
{
return roundScrollViewContentSize(*_page, proposedSize);
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
ASSERT(_scrollView == scrollView);
return self._currentContentView;
}

- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{
if (![self usesStandardContentView]) {
if ([_customContentView respondsToSelector:@selector(web_scrollViewWillBeginZooming:withView:)])
[_customContentView web_scrollViewWillBeginZooming:scrollView withView:view];
return;
}

if (scrollView.pinchGestureRecognizer.state == UIGestureRecognizerStateBegan) {
_page->willStartUserTriggeredZooming();
[_contentView scrollViewWillStartPanOrPinchGesture];
}
[_contentView willStartZoomOrScroll];

[_contentView cancelPointersForGestureRecognizer:scrollView.pinchGestureRecognizer];
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
if (![self usesStandardContentView])
return;

if (scrollView.panGestureRecognizer.state == UIGestureRecognizerStateBegan)
[_contentView scrollViewWillStartPanOrPinchGesture];

[_contentView willStartZoomOrScroll];
#if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
// FIXME: We will want to detect whether snapping will occur before beginning to drag. See WebPageProxy::didCommitLayerTree.
WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
ASSERT(scrollView == _scrollView.get());
CGFloat scrollDecelerationFactor = (coordinator && coordinator->shouldSetScrollViewDecelerationRateFast()) ? UIScrollViewDecelerationRateFast : UIScrollViewDecelerationRateNormal;
scrollView.horizontalScrollDecelerationFactor = scrollDecelerationFactor;
scrollView.verticalScrollDecelerationFactor = scrollDecelerationFactor;
#endif
}

- (void)_didFinishScrolling
{
if (![self usesStandardContentView])
return;

[self _scheduleVisibleContentRectUpdate];
[_contentView didFinishScrolling];
}

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
// Work around <rdar://problem/16374753> by avoiding deceleration while
// zooming. We'll animate to the right place once the zoom finishes.
if ([scrollView isZooming])
*targetContentOffset = [scrollView contentOffset];
else {
if ([_contentView preventsPanningInXAxis])
targetContentOffset->x = scrollView.contentOffset.x;
if ([_contentView preventsPanningInYAxis])
targetContentOffset->y = scrollView.contentOffset.y;
}
#if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
if (WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy()) {
// FIXME: Here, I'm finding the maximum horizontal/vertical scroll offsets. There's probably a better way to do this.
CGSize maxScrollOffsets = CGSizeMake(scrollView.contentSize.width - scrollView.bounds.size.width, scrollView.contentSize.height - scrollView.bounds.size.height);

UIEdgeInsets obscuredInset;

id<WKUIDelegatePrivate> uiDelegatePrivate = static_cast<id <WKUIDelegatePrivate>>([self UIDelegate]);
if ([uiDelegatePrivate respondsToSelector:@selector(_webView:finalObscuredInsetsForScrollView:withVelocity:targetContentOffset:)])
obscuredInset = [uiDelegatePrivate _webView:self finalObscuredInsetsForScrollView:scrollView withVelocity:velocity targetContentOffset:targetContentOffset];
else
obscuredInset = [self _computedObscuredInset];

CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, obscuredInset);

coordinator->adjustTargetContentOffsetForSnapping(maxScrollOffsets, velocity, unobscuredRect.origin.y, targetContentOffset);
}
#endif
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
// If we're decelerating, scroll offset will be updated when scrollViewDidFinishDecelerating: is called.
if (!decelerate)
[self _didFinishScrolling];
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
[self _didFinishScrolling];
}

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
{
[self _didFinishScrolling];
}

- (CGPoint)_scrollView:(UIScrollView *)scrollView adjustedOffsetForOffset:(CGPoint)offset translation:(CGPoint)translation startPoint:(CGPoint)start locationInView:(CGPoint)locationInView horizontalVelocity:(inout double *)hv verticalVelocity:(inout double *)vv
{
if (![_contentView preventsPanningInXAxis] && ![_contentView preventsPanningInYAxis]) {
[_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
return offset;
}

CGPoint adjustedContentOffset = CGPointMake(offset.x, offset.y);
if ([_contentView preventsPanningInXAxis])
adjustedContentOffset.x = start.x;
if ([_contentView preventsPanningInYAxis])
adjustedContentOffset.y = start.y;

if ((![_contentView preventsPanningInXAxis] && adjustedContentOffset.x != start.x)
|| (![_contentView preventsPanningInYAxis] && adjustedContentOffset.y != start.y)) {
[_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
}

return adjustedContentOffset;
}

#if HAVE(UISCROLLVIEW_ASYNCHRONOUS_SCROLL_EVENT_HANDLING)
- (void)_scrollView:(UIScrollView *)scrollView asynchronouslyHandleScrollEvent:(UIScrollEvent *)scrollEvent completion:(void (^)(BOOL handled))completion
{
if (scrollEvent.phase == UIScrollPhaseMayBegin) {
completion(NO);
return;
}

if (scrollEvent.phase == UIScrollPhaseBegan) {
_currentScrollGestureState = WTF::nullopt;
_wheelEventCountInCurrentScrollGesture = 0;
}

WebCore::IntPoint scrollLocation = WebCore::roundedIntPoint([scrollEvent locationInView:_contentView.get()]);
auto eventListeners = WebKit::eventListenerTypesAtPoint(_contentView.get(), scrollLocation);
bool hasWheelHandlers = eventListeners.contains(WebCore::EventListenerRegionType::Wheel);
if (!hasWheelHandlers) {
completion(NO);
return;
}

// Scroll events with zero delta are not dispatched to the page, so cannot be
// cancelled, so we can short-circuit them here.
// We make an exception for end-phase events, similar to the logic in
// EventHandler::handleWheelEventInAppropriateEnclosingBox.
CGVector deltaVector = [scrollEvent _adjustedAcceleratedDeltaInView:_contentView.get()];
if (!deltaVector.dx && !deltaVector.dy && scrollEvent.phase != UIScrollPhaseEnded) {
completion(NO);
return;
}

bool hasActiveWheelHandlers = eventListeners.contains(WebCore::EventListenerRegionType::NonPassiveWheel);
bool isCancelable = hasActiveWheelHandlers && (!_currentScrollGestureState || _currentScrollGestureState == WebCore::WheelScrollGestureState::Blocking);

Optional<WebKit::WebWheelEvent::Phase> overridePhase;
// The first event with non-zero delta in a given gesture should be considered the
// "Began" event in the WebCore sense (e.g. for deciding cancelability). Note that
// this may not be a UIScrollPhaseBegin event, nor even necessarily the first UIScrollPhaseChanged event.
if (!_wheelEventCountInCurrentScrollGesture)
overridePhase = WebKit::WebWheelEvent::PhaseBegan;
auto event = WebIOSEventFactory::createWebWheelEvent(scrollEvent, _contentView.get(), overridePhase);

_wheelEventCountInCurrentScrollGesture++;
_page->dispatchWheelEventWithoutScrolling(event, [weakSelf = WeakObjCPtr<WKWebView>(self), strongCompletion = makeBlockPtr(completion), isCancelable](bool handled) {
auto strongSelf = weakSelf.get();
if (!strongSelf) {
strongCompletion(NO);
return;
}

if (isCancelable) {
if (!strongSelf->_currentScrollGestureState)
strongSelf->_currentScrollGestureState = handled ? WebCore::WheelScrollGestureState::Blocking : WebCore::WheelScrollGestureState::NonBlocking;
strongCompletion(handled);
}
});

if (!isCancelable)
completion(NO);
}
#endif // HAVE(UISCROLLVIEW_ASYNCHRONOUS_SCROLL_EVENT_HANDLING)

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidScroll:)])
[_customContentView web_scrollViewDidScroll:(UIScrollView *)scrollView];

[self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];

if (WebKit::RemoteLayerTreeScrollingPerformanceData* scrollPerfData = _page->scrollingPerformanceData())
scrollPerfData->didScroll([self visibleRectInViewCoordinates]);
}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidZoom:)])
[_customContentView web_scrollViewDidZoom:scrollView];

[self _updateScrollViewBackground];
[self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
}

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
{
if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidEndZooming:withView:atScale:)])
[_customContentView web_scrollViewDidEndZooming:scrollView withView:view atScale:scale];

ASSERT(scrollView == _scrollView);
// FIXME: remove when rdar://problem/36065495 is fixed.
// When rotating with two fingers down, UIScrollView can set a bogus content view position.
// "Center" is top left because we set the anchorPoint to 0,0.
[_contentView setCenter:self.bounds.origin];

[self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
[_contentView didZoomToScale:scale];
}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
[self _didFinishScrolling];
}

- (void)_scrollViewDidInterruptDecelerating:(UIScrollView *)scrollView
{
if (![self usesStandardContentView])
return;

[_contentView didInterruptScrolling];
[self _scheduleVisibleContentRectUpdateAfterScrollInView:scrollView];
}

#pragma mark end UIScrollViewDelegate

- (CGRect)_visibleRectInEnclosingView:(UIView *)enclosingView
{
if (!enclosingView)
return self.bounds;

CGRect exposedRect = [enclosingView convertRect:enclosingView.bounds toView:self];
return CGRectIntersectsRect(exposedRect, self.bounds) ? CGRectIntersection(exposedRect, self.bounds) : CGRectZero;
}

- (CGRect)_visibleContentRect
{
if (_frozenVisibleContentRect)
return _frozenVisibleContentRect.value();

CGRect visibleRectInContentCoordinates = [self convertRect:self.bounds toView:_contentView.get()];

if (UIView *enclosingView = [self _enclosingViewForExposedRectComputation]) {
CGRect viewVisibleRect = [self _visibleRectInEnclosingView:enclosingView];
CGRect viewVisibleContentRect = [self convertRect:viewVisibleRect toView:_contentView.get()];
visibleRectInContentCoordinates = CGRectIntersection(visibleRectInContentCoordinates, viewVisibleContentRect);
}

return visibleRectInContentCoordinates;
}

// Called when some ancestor UIScrollView scrolls.
- (void)_didScroll
{
[self _scheduleVisibleContentRectUpdateAfterScrollInView:[self _scroller]];

const NSTimeInterval ScrollingEndedTimerInterval = 0.032;
if (!_enclosingScrollViewScrollTimer) {
_enclosingScrollViewScrollTimer = adoptNS([[NSTimer alloc] initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:ScrollingEndedTimerInterval]
interval:0 target:self selector:@selector(_enclosingScrollerScrollingEnded:) userInfo:nil repeats:YES]);
[[NSRunLoop mainRunLoop] addTimer:_enclosingScrollViewScrollTimer.get() forMode:NSDefaultRunLoopMode];
}
_didScrollSinceLastTimerFire = YES;
}

- (void)_enclosingScrollerScrollingEnded:(NSTimer *)timer
{
if (_didScrollSinceLastTimerFire) {
_didScrollSinceLastTimerFire = NO;
return;
}

[self _scheduleVisibleContentRectUpdate];
[_enclosingScrollViewScrollTimer invalidate];
_enclosingScrollViewScrollTimer = nil;
}

- (UIEdgeInsets)_scrollViewSystemContentInset
{
// It's not safe to access the scroll view's safeAreaInsets or _systemContentInset from
// inside our layoutSubviews implementation, because they aren't updated until afterwards.
// Instead, depend on the fact that the UIScrollView and WKWebView are in the same coordinate
// space, and map the WKWebView's own insets into the scroll view manually.
return UIEdgeInsetsAdd([_scrollView _contentScrollInset], self.safeAreaInsets, [_scrollView _edgesApplyingSafeAreaInsetsToContentInset]);
}

- (WebCore::FloatSize)activeViewLayoutSize:(const CGRect&)bounds
{
if (_viewLayoutSizeOverride)
return WebCore::FloatSize(_viewLayoutSizeOverride.value());

// FIXME: Likely we can remove this special case for watchOS and tvOS.
#if !PLATFORM(WATCHOS) && !PLATFORM(APPLETV)
return WebCore::FloatSize(UIEdgeInsetsInsetRect(CGRectMake(0, 0, bounds.size.width, bounds.size.height), self._scrollViewSystemContentInset).size);
#else
return WebCore::FloatSize { bounds.size };
#endif
}

- (void)_dispatchSetViewLayoutSize:(WebCore::FloatSize)viewLayoutSize
{
if (_lastSentViewLayoutSize && CGSizeEqualToSize(_lastSentViewLayoutSize.value(), viewLayoutSize))
return;

LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->identifier() << " _dispatchSetViewLayoutSize:] " << viewLayoutSize << " contentZoomScale " << contentZoomScale(self));
_page->setViewportConfigurationViewLayoutSize(viewLayoutSize, _page->layoutSizeScaleFactor(), _page->minimumEffectiveDeviceWidth());
_lastSentViewLayoutSize = viewLayoutSize;
}

- (void)_dispatchSetMaximumUnobscuredSize:(WebCore::FloatSize)maximumUnobscuredSize
{
if (_lastSentMaximumUnobscuredSize && CGSizeEqualToSize(_lastSentMaximumUnobscuredSize.value(), maximumUnobscuredSize))
return;

_page->setMaximumUnobscuredSize(maximumUnobscuredSize);
_lastSentMaximumUnobscuredSize = maximumUnobscuredSize;
}

- (void)_dispatchSetDeviceOrientation:(int32_t)deviceOrientation
{
if (_lastSentDeviceOrientation && _lastSentDeviceOrientation.value() == deviceOrientation)
return;

_page->setDeviceOrientation(deviceOrientation);
_lastSentDeviceOrientation = deviceOrientation;
}

- (void)_frameOrBoundsChanged
{
CGRect bounds = self.bounds;
[_scrollView setFrame:bounds];

if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing) {
if (!_viewLayoutSizeOverride)
[self _dispatchSetViewLayoutSize:[self activeViewLayoutSize:self.bounds]];
if (!_maximumUnobscuredSizeOverride)
[self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(bounds.size)];

BOOL sizeChanged = NO;
if (_page) {
if (auto drawingArea = _page->drawingArea())
sizeChanged = drawingArea->setSize(WebCore::IntSize(bounds.size));
}

if (sizeChanged & [self usesStandardContentView])
[_contentView setSizeChangedSinceLastVisibleContentRectUpdate:YES];
}

[_customContentView web_setMinimumSize:bounds.size];
[self _scheduleVisibleContentRectUpdate];
}

// Unobscured content rect where the user can interact. When the keyboard is up, this should be the area above or below the keyboard, wherever there is enough space.
- (CGRect)_contentRectForUserInteraction
{
// FIXME: handle split keyboard.
UIEdgeInsets obscuredInsets = _obscuredInsets;
obscuredInsets.bottom = std::max(_obscuredInsets.bottom, _inputViewBounds.size.height);
CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, obscuredInsets);
return [self convertRect:unobscuredRect toView:self._currentContentView];
}

// Ideally UIScrollView would expose this for us: <rdar://problem/21394567>.
- (BOOL)_scrollViewIsRubberBanding:(UIScrollView *)scrollView
{
float deviceScaleFactor = _page->deviceScaleFactor();

CGPoint contentOffset = [scrollView contentOffset];
CGPoint boundedOffset = contentOffsetBoundedInValidRange(scrollView, contentOffset);
return !pointsEqualInDevicePixels(contentOffset, boundedOffset, deviceScaleFactor);
}

// FIXME: Likely we can remove this special case for watchOS and tvOS.
#if !PLATFORM(WATCHOS) && !PLATFORM(APPLETV)
- (void)safeAreaInsetsDidChange
{
[super safeAreaInsetsDidChange];

[self _scheduleVisibleContentRectUpdate];
[_safeBrowsingWarning setContentInset:[self _computedObscuredInsetForSafeBrowsingWarning]];
}
#endif

- (void)_scheduleVisibleContentRectUpdate
{
// For visible rect updates not associated with a specific UIScrollView, just consider our own scroller.
[self _scheduleVisibleContentRectUpdateAfterScrollInView:_scrollView.get()];
}

- (void)_scheduleForcedVisibleContentRectUpdate
{
_alwaysSendNextVisibleContentRectUpdate = YES;
[self _scheduleVisibleContentRectUpdate];
}

- (OptionSet<WebKit::ViewStabilityFlag>)_viewStabilityState:(UIScrollView *)scrollView
{
OptionSet<WebKit::ViewStabilityFlag> stabilityFlags;

if (scrollView.isDragging || scrollView.isZooming || scrollView._isInterruptingDeceleration)
stabilityFlags.add(WebKit::ViewStabilityFlag::ScrollViewInteracting);

if (scrollView.isDecelerating || scrollView._isAnimatingZoom || scrollView._isScrollingToTop)
stabilityFlags.add(WebKit::ViewStabilityFlag::ScrollViewAnimatedScrollOrZoom);

if (scrollView == _scrollView.get() && _isChangingObscuredInsetsInteractively)
stabilityFlags.add(WebKit::ViewStabilityFlag::ChangingObscuredInsetsInteractively);

if ([self _scrollViewIsRubberBanding:scrollView])
stabilityFlags.add(WebKit::ViewStabilityFlag::ScrollViewRubberBanding);

if (NSNumber *stableOverride = self._stableStateOverride) {
if (stableOverride.boolValue)
stabilityFlags = { };
else
stabilityFlags.add(WebKit::ViewStabilityFlag::UnstableForTesting);
}

return stabilityFlags;
}

- (void)_addUpdateVisibleContentRectPreCommitHandler
{
auto retainedSelf = retainPtr(self);
[CATransaction addCommitHandler:[retainedSelf] {
WKWebView *webView = retainedSelf.get();
if (![webView _isValid]) {
RELEASE_LOG_IF(webView._page && webView._page->isAlwaysOnLoggingAllowed(), ViewState, "In CATransaction preCommitHandler, WKWebView %p is invalid", webView);
return;
}

@try {
[webView _updateVisibleContentRects];
} @catch (NSException *exception) {
RELEASE_LOG_IF(webView._page && webView._page->isAlwaysOnLoggingAllowed(), ViewState, "In CATransaction preCommitHandler, -[WKWebView %p _updateVisibleContentRects] threw an exception", webView);
}
webView->_hasScheduledVisibleRectUpdate = NO;
} forPhase:kCATransactionPhasePreCommit];
}

- (void)_scheduleVisibleContentRectUpdateAfterScrollInView:(UIScrollView *)scrollView
{
_viewStabilityWhenVisibleContentRectUpdateScheduled = [self _viewStabilityState:scrollView];

if (_hasScheduledVisibleRectUpdate) {
auto timeNow = MonotonicTime::now();
if ((timeNow - _timeOfRequestForVisibleContentRectUpdate) > delayBeforeNoVisibleContentsRectsLogging) {
RELEASE_LOG_IF_ALLOWED("-[WKWebView %p _scheduleVisibleContentRectUpdateAfterScrollInView]: _hasScheduledVisibleRectUpdate is true but haven't updated visible content rects for %.2fs (last update was %.2fs ago) - valid %d",
self, (timeNow - _timeOfRequestForVisibleContentRectUpdate).value(), (timeNow - _timeOfLastVisibleContentRectUpdate).value(), [self _isValid]);
}
return;
}

_hasScheduledVisibleRectUpdate = YES;
_timeOfRequestForVisibleContentRectUpdate = MonotonicTime::now();

CATransactionPhase transactionPhase = [CATransaction currentPhase];
if (transactionPhase == kCATransactionPhaseNull || transactionPhase == kCATransactionPhasePreLayout) {
[self _addUpdateVisibleContentRectPreCommitHandler];
return;
}

dispatch_async(dispatch_get_main_queue(), [retainedSelf = retainPtr(self)] {
WKWebView *webView = retainedSelf.get();
if (![webView _isValid])
return;
[webView _addUpdateVisibleContentRectPreCommitHandler];
});
}

static bool scrollViewCanScroll(UIScrollView *scrollView)
{
if (!scrollView)
return NO;

UIEdgeInsets contentInset = scrollView.contentInset;
CGSize contentSize = scrollView.contentSize;
CGSize boundsSize = scrollView.bounds.size;

return (contentSize.width + contentInset.left + contentInset.right) > boundsSize.width
|| (contentSize.height + contentInset.top + contentInset.bottom) > boundsSize.height;
}

- (CGRect)_contentBoundsExtendedForRubberbandingWithScale:(CGFloat)scaleFactor
{
CGPoint contentOffset = [_scrollView contentOffset];
CGPoint boundedOffset = contentOffsetBoundedInValidRange(_scrollView.get(), contentOffset);

CGFloat horiontalRubberbandAmountInContentCoordinates = (contentOffset.x - boundedOffset.x) / scaleFactor;
CGFloat verticalRubberbandAmountInContentCoordinates = (contentOffset.y - boundedOffset.y) / scaleFactor;

CGRect extendedBounds = [_contentView bounds];

if (horiontalRubberbandAmountInContentCoordinates < 0) {
extendedBounds.origin.x += horiontalRubberbandAmountInContentCoordinates;
extendedBounds.size.width -= horiontalRubberbandAmountInContentCoordinates;
} else if (horiontalRubberbandAmountInContentCoordinates > 0)
extendedBounds.size.width += horiontalRubberbandAmountInContentCoordinates;

if (verticalRubberbandAmountInContentCoordinates < 0) {
extendedBounds.origin.y += verticalRubberbandAmountInContentCoordinates;
extendedBounds.size.height -= verticalRubberbandAmountInContentCoordinates;
} else if (verticalRubberbandAmountInContentCoordinates > 0)
extendedBounds.size.height += verticalRubberbandAmountInContentCoordinates;

return extendedBounds;
}

- (UIEdgeInsets)currentlyVisibleContentInsetsWithScale:(CGFloat)scaleFactor obscuredInsets:(UIEdgeInsets)obscuredInsets
{
// The following logic computes the extent to which the bottom, top, left and right content insets are visible.
auto scrollViewInsets = [_scrollView contentInset];
auto scrollViewBounds = [_scrollView bounds];
auto scrollViewContentSize = [_scrollView contentSize];
auto scrollViewOriginIncludingInset = UIEdgeInsetsInsetRect(scrollViewBounds, obscuredInsets).origin;
auto maximumVerticalScrollExtentWithoutRevealingBottomContentInset = scrollViewContentSize.height - CGRectGetHeight(scrollViewBounds);
auto maximumHorizontalScrollExtentWithoutRevealingRightContentInset = scrollViewContentSize.width - CGRectGetWidth(scrollViewBounds);
auto contentInsets = UIEdgeInsetsZero;

if (scrollViewInsets.left > 0 && scrollViewOriginIncludingInset.x < 0)
contentInsets.left = std::min(-scrollViewOriginIncludingInset.x, scrollViewInsets.left) / scaleFactor;

if (scrollViewInsets.top > 0 && scrollViewOriginIncludingInset.y < 0)
contentInsets.top = std::min(-scrollViewOriginIncludingInset.y, scrollViewInsets.top) / scaleFactor;

if (scrollViewInsets.right > 0 && scrollViewOriginIncludingInset.x > maximumHorizontalScrollExtentWithoutRevealingRightContentInset)
contentInsets.right = std::min(scrollViewOriginIncludingInset.x - maximumHorizontalScrollExtentWithoutRevealingRightContentInset, scrollViewInsets.right) / scaleFactor;

if (scrollViewInsets.bottom > 0 && scrollViewOriginIncludingInset.y > maximumVerticalScrollExtentWithoutRevealingBottomContentInset)
contentInsets.bottom = std::min(scrollViewOriginIncludingInset.y - maximumVerticalScrollExtentWithoutRevealingBottomContentInset, scrollViewInsets.bottom) / scaleFactor;

return contentInsets;
}

- (void)_updateVisibleContentRects
{
auto viewStability = _viewStabilityWhenVisibleContentRectUpdateScheduled;

if (![self usesStandardContentView]) {
[_passwordView setFrame:self.bounds];
[_customContentView web_computedContentInsetDidChange];
_didDeferUpdateVisibleContentRectsForAnyReason = YES;
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _updateVisibleContentRects:] - usesStandardContentView is NO, bailing", self, _page->identifier().toUInt64());
return;
}

auto timeNow = MonotonicTime::now();
if (_timeOfFirstVisibleContentRectUpdateWithPendingCommit) {
auto timeSinceFirstRequestWithPendingCommit = timeNow - *_timeOfFirstVisibleContentRectUpdateWithPendingCommit;
if (timeSinceFirstRequestWithPendingCommit > delayBeforeNoCommitsLogging)
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _updateVisibleContentRects:] - have not received a commit %.2fs after visible content rect update; lastTransactionID %llu", self, _page->identifier().toUInt64(), timeSinceFirstRequestWithPendingCommit.value(), _lastTransactionID.toUInt64());
}

if (_invokingUIScrollViewDelegateCallback) {
_didDeferUpdateVisibleContentRectsForUIScrollViewDelegateCallback = YES;
_didDeferUpdateVisibleContentRectsForAnyReason = YES;
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _updateVisibleContentRects:] - _invokingUIScrollViewDelegateCallback is YES, bailing", self, _page->identifier().toUInt64());
return;
}

if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing
|| (_needsResetViewStateAfterCommitLoadForMainFrame && ![_contentView sizeChangedSinceLastVisibleContentRectUpdate])
|| [_scrollView isZoomBouncing]
|| _currentlyAdjustingScrollViewInsetsForKeyboard) {
_didDeferUpdateVisibleContentRectsForAnyReason = YES;
_didDeferUpdateVisibleContentRectsForUnstableScrollView = YES;
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _updateVisibleContentRects:] - scroll view state is non-stable, bailing (_dynamicViewportUpdateMode %d, _needsResetViewStateAfterCommitLoadForMainFrame %d, sizeChangedSinceLastVisibleContentRectUpdate %d, [_scrollView isZoomBouncing] %d, _currentlyAdjustingScrollViewInsetsForKeyboard %d)",
self, _page->identifier().toUInt64(), _dynamicViewportUpdateMode, _needsResetViewStateAfterCommitLoadForMainFrame, [_contentView sizeChangedSinceLastVisibleContentRectUpdate], [_scrollView isZoomBouncing], _currentlyAdjustingScrollViewInsetsForKeyboard);
return;
}

if (_didDeferUpdateVisibleContentRectsForAnyReason)
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _updateVisibleContentRects:] - performing first visible content rect update after deferring updates", self, _page->identifier().toUInt64());

_didDeferUpdateVisibleContentRectsForUIScrollViewDelegateCallback = NO;
_didDeferUpdateVisibleContentRectsForUnstableScrollView = NO;
_didDeferUpdateVisibleContentRectsForAnyReason = NO;

CGRect visibleRectInContentCoordinates = [self _visibleContentRect];

UIEdgeInsets computedContentInsetUnadjustedForKeyboard = [self _computedObscuredInset];
if (!_haveSetObscuredInsets)
computedContentInsetUnadjustedForKeyboard.bottom -= _totalScrollViewBottomInsetAdjustmentForKeyboard;

CGFloat scaleFactor = contentZoomScale(self);
CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, computedContentInsetUnadjustedForKeyboard);
CGRect unobscuredRectInContentCoordinates = _frozenUnobscuredContentRect ? _frozenUnobscuredContentRect.value() : [self convertRect:unobscuredRect toView:_contentView.get()];
unobscuredRectInContentCoordinates = CGRectIntersection(unobscuredRectInContentCoordinates, [self _contentBoundsExtendedForRubberbandingWithScale:scaleFactor]);

auto contentInsets = [self currentlyVisibleContentInsetsWithScale:scaleFactor obscuredInsets:computedContentInsetUnadjustedForKeyboard];

#if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
if (viewStability.isEmpty()) {
WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
if (coordinator && coordinator->hasActiveSnapPoint()) {
CGPoint currentPoint = [_scrollView contentOffset];
CGPoint activePoint = coordinator->nearestActiveContentInsetAdjustedSnapOffset(unobscuredRect.origin.y, currentPoint);

if (!CGPointEqualToPoint(activePoint, currentPoint)) {
RetainPtr<WKScrollView> strongScrollView = _scrollView;
dispatch_async(dispatch_get_main_queue(), [strongScrollView, activePoint] {
[strongScrollView setContentOffset:activePoint animated:NO];
});
}
}
}
#endif

[_contentView didUpdateVisibleRect:visibleRectInContentCoordinates
unobscuredRect:unobscuredRectInContentCoordinates
contentInsets:contentInsets
unobscuredRectInScrollViewCoordinates:unobscuredRect
obscuredInsets:_obscuredInsets
unobscuredSafeAreaInsets:[self _computedUnobscuredSafeAreaInset]
inputViewBounds:_inputViewBounds
scale:scaleFactor minimumScale:[_scrollView minimumZoomScale]
viewStability:viewStability
enclosedInScrollableAncestorView:scrollViewCanScroll([self _scroller])
sendEvenIfUnchanged:_alwaysSendNextVisibleContentRectUpdate];

while (!_visibleContentRectUpdateCallbacks.isEmpty()) {
auto callback = _visibleContentRectUpdateCallbacks.takeLast();
callback();
}

if ((timeNow - _timeOfRequestForVisibleContentRectUpdate) > delayBeforeNoVisibleContentsRectsLogging)
RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _updateVisibleContentRects:] finally ran %.2fs after being scheduled", self, (timeNow - _timeOfRequestForVisibleContentRectUpdate).value());

_alwaysSendNextVisibleContentRectUpdate = NO;
_timeOfLastVisibleContentRectUpdate = timeNow;
if (!_timeOfFirstVisibleContentRectUpdateWithPendingCommit)
_timeOfFirstVisibleContentRectUpdateWithPendingCommit = timeNow;
}

- (void)_didStartProvisionalLoadForMainFrame
{
if (_gestureController)
_gestureController->didStartProvisionalLoadForMainFrame();
}

static WebCore::FloatSize activeMaximumUnobscuredSize(WKWebView *webView, const CGRect& bounds)
{
return WebCore::FloatSize(webView->_maximumUnobscuredSizeOverride.valueOr(bounds.size));
}

static int32_t activeOrientation(WKWebView *webView)
{
return webView->_overridesInterfaceOrientation ? deviceOrientationForUIInterfaceOrientation(webView->_interfaceOrientationOverride) : webView->_page->deviceOrientation();
}

- (void)_cancelAnimatedResize
{
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _cancelAnimatedResize] _dynamicViewportUpdateMode %d", self, _page->identifier().toUInt64(), _dynamicViewportUpdateMode);

if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
return;

if (!_customContentView) {
if (_resizeAnimationView) {
NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
[_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
[_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
[_resizeAnimationView removeFromSuperview];
_resizeAnimationView = nil;
}

[_contentView setHidden:NO];
_resizeAnimationTransformAdjustments = CATransform3DIdentity;
}

_dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
[self _scheduleVisibleContentRectUpdate];
}

- (void)_didCompleteAnimatedResize
{
if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
return;

[_contentView setHidden:NO];

if (!_resizeAnimationView) {
// Paranoia. If _resizeAnimationView is null we'll end up setting a zero scale on the content view.
RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didCompleteAnimatedResize:] - _resizeAnimationView is nil", self);
[self _cancelAnimatedResize];
return;
}

RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _didCompleteAnimatedResize]", self, _page->identifier().toUInt64());

NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
[_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
[_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];

CALayer *contentLayer = [_contentView layer];
CGFloat adjustmentScale = _resizeAnimationTransformAdjustments.m11;
contentLayer.sublayerTransform = CATransform3DIdentity;

CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
CATransform3D contentLayerTransform = contentLayer.transform;
CGFloat currentScale = [[_resizeAnimationView layer] transform].m11 * contentLayerTransform.m11;

// We cannot use [UIScrollView setZoomScale:] directly because the UIScrollView delegate would get a callback with
// an invalid contentOffset. The real content offset is only set below.
// Since there is no public API for setting both the zoomScale and the contentOffset, we set the zoomScale manually
// on the zoom layer and then only change the contentOffset.
CGFloat adjustedScale = adjustmentScale * currentScale;
contentLayerTransform.m11 = adjustedScale;
contentLayerTransform.m22 = adjustedScale;
contentLayer.transform = contentLayerTransform;

CGPoint currentScrollOffset = [_scrollView contentOffset];
double horizontalScrollAdjustement = _resizeAnimationTransformAdjustments.m41 * animatingScaleTarget;
double verticalScrollAdjustment = _resizeAnimationTransformAdjustments.m42 * animatingScaleTarget;

[_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
[_scrollView setContentOffset:CGPointMake(currentScrollOffset.x - horizontalScrollAdjustement, currentScrollOffset.y - verticalScrollAdjustment)];

[_resizeAnimationView removeFromSuperview];
_resizeAnimationView = nil;
_resizeAnimationTransformAdjustments = CATransform3DIdentity;

_dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::NotResizing;
[self _scheduleVisibleContentRectUpdate];

CGRect newBounds = self.bounds;
auto newViewLayoutSize = [self activeViewLayoutSize:newBounds];
auto newMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, newBounds);
int32_t newOrientation = activeOrientation(self);

if (!_lastSentViewLayoutSize || newViewLayoutSize != _lastSentViewLayoutSize.value())
[self _dispatchSetViewLayoutSize:newViewLayoutSize];

if (!_lastSentMaximumUnobscuredSize || newMaximumUnobscuredSize != _lastSentMaximumUnobscuredSize.value())
[self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(newMaximumUnobscuredSize)];

if (!_lastSentDeviceOrientation || newOrientation != _lastSentDeviceOrientation.value())
[self _dispatchSetDeviceOrientation:newOrientation];

while (!_callbacksDeferredDuringResize.isEmpty())
_callbacksDeferredDuringResize.takeLast()();
}

- (void)_didFinishNavigation:(API::Navigation*)navigation
{
if (_gestureController)
_gestureController->didFinishNavigation(navigation);
}

- (void)_didFailNavigation:(API::Navigation*)navigation
{
if (_gestureController)
_gestureController->didFailNavigation(navigation);
}

- (void)_didSameDocumentNavigationForMainFrame:(WebKit::SameDocumentNavigationType)navigationType
{
[_customContentView web_didSameDocumentNavigation:toAPI(navigationType)];

if (_gestureController)
_gestureController->didSameDocumentNavigationForMainFrame(navigationType);
}

- (void)_keyboardChangedWithInfo:(NSDictionary *)keyboardInfo adjustScrollView:(BOOL)adjustScrollView
{
NSValue *endFrameValue = [keyboardInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
if (!endFrameValue)
return;

auto previousInputViewBounds = _inputViewBounds;
BOOL selectionWasVisible = self._selectionRectIsFullyVisibleAndNonEmpty;

// The keyboard rect is always in screen coordinates. In the view services case the window does not
// have the interface orientation rotation transformation; its host does. So, it makes no sense to
// clip the keyboard rect against its screen.
if ([[self window] _isHostedInAnotherProcess])
_inputViewBounds = [self.window convertRect:[endFrameValue CGRectValue] fromWindow:nil];
else
_inputViewBounds = [self.window convertRect:CGRectIntersection([endFrameValue CGRectValue], self.window.screen.bounds) fromWindow:nil];

if ([[UIPeripheralHost sharedInstance] isUndocked])
_inputViewBounds = CGRectZero;

if (adjustScrollView) {
CGFloat bottomInsetBeforeAdjustment = [_scrollView contentInset].bottom;
SetForScope<BOOL> insetAdjustmentGuard(_currentlyAdjustingScrollViewInsetsForKeyboard, YES);
[_scrollView _adjustForAutomaticKeyboardInfo:keyboardInfo animated:YES lastAdjustment:&_lastAdjustmentForScroller];
CGFloat bottomInsetAfterAdjustment = [_scrollView contentInset].bottom;
// FIXME: This "total bottom content inset adjustment" mechanism hasn't worked since iOS 11, since -_adjustForAutomaticKeyboardInfo:animated:lastAdjustment:
// no longer sets -[UIScrollView contentInset] for apps linked on or after iOS 11. We should consider removing this logic, since the original bug this was
// intended to fix, <rdar://problem/23202254>, remains fixed through other means.
if (bottomInsetBeforeAdjustment != bottomInsetAfterAdjustment)
_totalScrollViewBottomInsetAdjustmentForKeyboard += bottomInsetAfterAdjustment - bottomInsetBeforeAdjustment;
}

if (selectionWasVisible && [_contentView _hasFocusedElement] && !CGRectIsEmpty(previousInputViewBounds) && !CGRectIsEmpty(_inputViewBounds) && !CGRectEqualToRect(previousInputViewBounds, _inputViewBounds))
[self _scrollToAndRevealSelectionIfNeeded];

[self _scheduleVisibleContentRectUpdate];
}

- (BOOL)_shouldUpdateKeyboardWithInfo:(NSDictionary *)keyboardInfo
{
if ([_contentView isFocusingElement])
return YES;

NSNumber *isLocalKeyboard = [keyboardInfo valueForKey:UIKeyboardIsLocalUserInfoKey];
return isLocalKeyboard && !isLocalKeyboard.boolValue;
}

- (void)_keyboardWillChangeFrame:(NSNotification *)notification
{
if ([self _shouldUpdateKeyboardWithInfo:notification.userInfo])
[self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
}

- (void)_keyboardDidChangeFrame:(NSNotification *)notification
{
[self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:NO];
}

- (void)_keyboardWillShow:(NSNotification *)notification
{
if ([self _shouldUpdateKeyboardWithInfo:notification.userInfo])
[self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];

_page->setIsKeyboardAnimatingIn(true);
}

- (void)_keyboardDidShow:(NSNotification *)notification
{
_page->setIsKeyboardAnimatingIn(false);
}

- (void)_keyboardWillHide:(NSNotification *)notification
{
if ([_contentView shouldIgnoreKeyboardWillHideNotification])
return;

[self _keyboardChangedWithInfo:notification.userInfo adjustScrollView:YES];
}

- (void)_windowDidRotate:(NSNotification *)notification
{
if (!_overridesInterfaceOrientation)
[self _dispatchSetDeviceOrientation:[self _deviceOrientation]];
}

- (void)_contentSizeCategoryDidChange:(NSNotification *)notification
{
_page->contentSizeCategoryDidChange([self _contentSizeCategory]);
}

- (void)_accessibilitySettingsDidChange:(NSNotification *)notification
{
_page->accessibilitySettingsDidChange();
}

- (NSString *)_contentSizeCategory
{
return [[UIApplication sharedApplication] preferredContentSizeCategory];
}

- (BOOL)_isNavigationSwipeGestureRecognizer:(UIGestureRecognizer *)recognizer
{
if (!_gestureController)
return NO;
return _gestureController->isNavigationSwipeGestureRecognizer(recognizer);
}

- (void)_navigationGestureDidBegin
{
// During a back/forward swipe, there's a view interposed between this view and the content view that has
// an offset and animation on it, which results in computing incorrect rectangles. Work around by using
// frozen rects during swipes.
CGRect fullViewRect = self.bounds;
CGRect unobscuredRect = UIEdgeInsetsInsetRect(fullViewRect, [self _computedObscuredInset]);

_frozenVisibleContentRect = [self convertRect:fullViewRect toView:_contentView.get()];
_frozenUnobscuredContentRect = [self convertRect:unobscuredRect toView:_contentView.get()];
_contentViewShouldBecomeFirstResponderAfterNavigationGesture = [_contentView isFirstResponder];

LOG_WITH_STREAM(VisibleRects, stream << "_navigationGestureDidBegin: freezing visibleContentRect " << WebCore::FloatRect(_frozenVisibleContentRect.value()) << " UnobscuredContentRect " << WebCore::FloatRect(_frozenUnobscuredContentRect.value()));
}

- (void)_navigationGestureDidEnd
{
_frozenVisibleContentRect = WTF::nullopt;
_frozenUnobscuredContentRect = WTF::nullopt;

if (_contentViewShouldBecomeFirstResponderAfterNavigationGesture) {
if (self.window && ![_contentView isFirstResponder])
[_contentView becomeFirstResponder];
_contentViewShouldBecomeFirstResponderAfterNavigationGesture = NO;
}
}

- (void)_showPasswordViewWithDocumentName:(NSString *)documentName passwordHandler:(void (^)(NSString *))passwordHandler
{
ASSERT(!_passwordView);
_passwordView = adoptNS([[WKPasswordView alloc] initWithFrame:self.bounds documentName:documentName]);
[_passwordView setUserDidEnterPassword:passwordHandler];
[_passwordView showInScrollView:_scrollView.get()];
self._currentContentView.hidden = YES;
}

- (void)_hidePasswordView
{
if (!_passwordView)
return;

self._currentContentView.hidden = NO;
[_passwordView hide];
_passwordView = nil;
}

- (WKPasswordView *)_passwordView
{
return _passwordView.get();
}

- (void)_updateScrollViewInsetAdjustmentBehavior
{
// FIXME: Likely we can remove this special case for watchOS and tvOS.
#if !PLATFORM(WATCHOS) && !PLATFORM(APPLETV)
if (![_scrollView _contentInsetAdjustmentBehaviorWasExternallyOverridden])
[_scrollView _setContentInsetAdjustmentBehaviorInternal:self._safeAreaShouldAffectObscuredInsets ? UIScrollViewContentInsetAdjustmentAlways : UIScrollViewContentInsetAdjustmentNever];
#endif
}

- (void)_setAvoidsUnsafeArea:(BOOL)avoidsUnsafeArea
{
if (_avoidsUnsafeArea == avoidsUnsafeArea)
return;

_avoidsUnsafeArea = avoidsUnsafeArea;

[self _updateScrollViewInsetAdjustmentBehavior];
[self _scheduleVisibleContentRectUpdate];

id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)[self UIDelegate];
if ([uiDelegate respondsToSelector:@selector(_webView:didChangeSafeAreaShouldAffectObscuredInsets:)])
[uiDelegate _webView:self didChangeSafeAreaShouldAffectObscuredInsets:avoidsUnsafeArea];
}

- (BOOL)_haveSetObscuredInsets
{
return _haveSetObscuredInsets;
}

#if ENABLE(FULLSCREEN_API)
- (void)removeFromSuperview
{
[super removeFromSuperview];

if ([_fullScreenWindowController isFullScreen])
[_fullScreenWindowController webViewDidRemoveFromSuperviewWhileInFullscreen];
}
#endif

- (void)_firePresentationUpdateForPendingStableStatePresentationCallbacks
{
RetainPtr<WKWebView> strongSelf = self;
[self _doAfterNextPresentationUpdate:[strongSelf] {
dispatch_async(dispatch_get_main_queue(), [strongSelf] {
if ([strongSelf->_stableStatePresentationUpdateCallbacks count])
[strongSelf _firePresentationUpdateForPendingStableStatePresentationCallbacks];
});
}];
}

static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISemanticContentAttribute contentAttribute)
{
auto direction = [UIView userInterfaceLayoutDirectionForSemanticContentAttribute:contentAttribute];
switch (direction) {
case UIUserInterfaceLayoutDirectionLeftToRight:
return WebCore::UserInterfaceLayoutDirection::LTR;
case UIUserInterfaceLayoutDirectionRightToLeft:
return WebCore::UserInterfaceLayoutDirection::RTL;
}

ASSERT_NOT_REACHED();
return WebCore::UserInterfaceLayoutDirection::LTR;
}

- (void)setSemanticContentAttribute:(UISemanticContentAttribute)contentAttribute
{
[super setSemanticContentAttribute:contentAttribute];

if (_page)
_page->setUserInterfaceLayoutDirection(toUserInterfaceLayoutDirection(contentAttribute));
}

@end

@implementation WKWebView (WKPrivateIOS)

- (void)_setEventAttribution:(_UIEventAttribution *)attribution
{
if (attribution) {
WebCore::PrivateClickMeasurement measurement(
WebCore::PrivateClickMeasurement::SourceID(attribution.sourceIdentifier),
WebCore::PrivateClickMeasurement::SourceSite(attribution.reportEndpoint),
WebCore::PrivateClickMeasurement::AttributeOnSite(attribution.attributeOn),
attribution.sourceDescription,
attribution.purchaser
);
_page->setPrivateClickMeasurement(WTFMove(measurement));
} else
_page->setPrivateClickMeasurement(WTF::nullopt);
}

- (_UIEventAttribution *)_eventAttribution
{
auto& measurement = _page->privateClickMeasurement();
if (!measurement || !measurement->sourceID().isValid())
return nil;

auto attributeOnURL = URL(URL(), makeString("https://", measurement->attributeOnSite().registrableDomain.string()));
return [[WebKit::alloc_UIEventAttributionInstance() initWithSourceIdentifier:measurement->sourceID().id attributeOn:attributeOnURL sourceDescription:measurement->sourceDescription() purchaser:measurement->purchaser()] autorelease];
}

- (CGRect)_contentVisibleRect
{
return [self convertRect:[self bounds] toView:self._currentContentView];
}

// Deprecated SPI.
- (CGSize)_minimumLayoutSizeOverride
{
ASSERT(_viewLayoutSizeOverride);
return _viewLayoutSizeOverride.valueOr(CGSizeZero);
}

- (void)_setViewLayoutSizeOverride:(CGSize)viewLayoutSizeOverride
{
_viewLayoutSizeOverride = viewLayoutSizeOverride;

if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
[self _dispatchSetViewLayoutSize:WebCore::FloatSize(viewLayoutSizeOverride)];
}

// Deprecated SPI
- (CGSize)_maximumUnobscuredSizeOverride
{
ASSERT(_maximumUnobscuredSizeOverride);
return _maximumUnobscuredSizeOverride.valueOr(CGSizeZero);
}

- (void)_setMaximumUnobscuredSizeOverride:(CGSize)size
{
ASSERT(size.width <= self.bounds.size.width && size.height <= self.bounds.size.height);
_maximumUnobscuredSizeOverride = size;

if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
[self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(size)];
}

- (UIEdgeInsets)_obscuredInsets
{
return _obscuredInsets;
}

- (void)_setObscuredInsets:(UIEdgeInsets)obscuredInsets
{
ASSERT(obscuredInsets.top >= 0);
ASSERT(obscuredInsets.left >= 0);
ASSERT(obscuredInsets.bottom >= 0);
ASSERT(obscuredInsets.right >= 0);

_haveSetObscuredInsets = YES;

if (UIEdgeInsetsEqualToEdgeInsets(_obscuredInsets, obscuredInsets))
return;

_obscuredInsets = obscuredInsets;

[self _scheduleVisibleContentRectUpdate];
[_safeBrowsingWarning setContentInset:[self _computedObscuredInsetForSafeBrowsingWarning]];
}

- (UIRectEdge)_obscuredInsetEdgesAffectedBySafeArea
{
return _obscuredInsetEdgesAffectedBySafeArea;
}

- (void)_setObscuredInsetEdgesAffectedBySafeArea:(UIRectEdge)edges
{
if (edges == _obscuredInsetEdgesAffectedBySafeArea)
return;

_obscuredInsetEdgesAffectedBySafeArea = edges;

[self _scheduleVisibleContentRectUpdate];
}

- (UIEdgeInsets)_unobscuredSafeAreaInsets
{
return _unobscuredSafeAreaInsets;
}

- (void)_setUnobscuredSafeAreaInsets:(UIEdgeInsets)unobscuredSafeAreaInsets
{
ASSERT(unobscuredSafeAreaInsets.top >= 0);
ASSERT(unobscuredSafeAreaInsets.left >= 0);
ASSERT(unobscuredSafeAreaInsets.bottom >= 0);
ASSERT(unobscuredSafeAreaInsets.right >= 0);

_haveSetUnobscuredSafeAreaInsets = YES;

if (UIEdgeInsetsEqualToEdgeInsets(_unobscuredSafeAreaInsets, unobscuredSafeAreaInsets))
return;

_unobscuredSafeAreaInsets = unobscuredSafeAreaInsets;

[self _scheduleVisibleContentRectUpdate];
}

- (BOOL)_safeAreaShouldAffectObscuredInsets
{
if (![self usesStandardContentView])
return NO;
return _avoidsUnsafeArea;
}

- (UIView *)_enclosingViewForExposedRectComputation
{
return [self _scroller];
}

- (void)_setInterfaceOrientationOverride:(UIInterfaceOrientation)interfaceOrientation
{
_overridesInterfaceOrientation = YES;
_interfaceOrientationOverride = interfaceOrientation;

if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::NotResizing)
[self _dispatchSetDeviceOrientation:deviceOrientationForUIInterfaceOrientation(_interfaceOrientationOverride)];
}

- (UIInterfaceOrientation)_interfaceOrientationOverride
{
ASSERT(_overridesInterfaceOrientation);
return _interfaceOrientationOverride;
}

- (void)_clearInterfaceOrientationOverride
{
_overridesInterfaceOrientation = NO;
_interfaceOrientationOverride = UIInterfaceOrientationPortrait;
}

- (void)_setAllowsViewportShrinkToFit:(BOOL)allowShrinkToFit
{
_allowsViewportShrinkToFit = allowShrinkToFit;
}

- (BOOL)_allowsViewportShrinkToFit
{
return _allowsViewportShrinkToFit;
}

- (BOOL)_isDisplayingPDF
{
for (auto& mimeType : WebCore::MIMETypeRegistry::pdfMIMETypes()) {
Class providerClass = [[_configuration _contentProviderRegistry] providerForMIMEType:mimeType];
if ([_customContentView isKindOfClass:providerClass])
return YES;
}

return NO;
}

- (NSData *)_dataForDisplayedPDF
{
if (![self _isDisplayingPDF])
return nil;
return [_customContentView web_dataRepresentation];
}

- (NSString *)_suggestedFilenameForDisplayedPDF
{
if (![self _isDisplayingPDF])
return nil;
return [_customContentView web_suggestedFilename];
}

- (_WKWebViewPrintFormatter *)_webViewPrintFormatter
{
UIViewPrintFormatter *viewPrintFormatter = self.viewPrintFormatter;
ASSERT([viewPrintFormatter isKindOfClass:[_WKWebViewPrintFormatter class]]);
return (_WKWebViewPrintFormatter *)viewPrintFormatter;
}

- (_WKDragInteractionPolicy)_dragInteractionPolicy
{
return _dragInteractionPolicy;
}

- (void)_setDragInteractionPolicy:(_WKDragInteractionPolicy)policy
{
if (_dragInteractionPolicy == policy)
return;

_dragInteractionPolicy = policy;
#if ENABLE(DRAG_SUPPORT)
[_contentView _didChangeDragInteractionPolicy];
#endif
}

- (BOOL)_shouldAvoidResizingWhenInputViewBoundsChange
{
return [_contentView _shouldAvoidResizingWhenInputViewBoundsChange];
}

- (BOOL)_contentViewIsFirstResponder
{
return self._currentContentView.isFirstResponder;
}

- (CGRect)_uiTextCaretRect
{
// Force the selection view to update if needed.
[_contentView _updateChangedSelection];

return [[_contentView valueForKeyPath:@"interactionAssistant.selectionView.selection.caretRect"] CGRectValue];
}

- (UIView *)_safeBrowsingWarning
{
return _safeBrowsingWarning.get();
}

- (CGPoint)_convertPointFromContentsToView:(CGPoint)point
{
return [self convertPoint:point fromView:self._currentContentView];
}

- (CGPoint)_convertPointFromViewToContents:(CGPoint)point
{
return [self convertPoint:point toView:self._currentContentView];
}

- (void)_doAfterNextStablePresentationUpdate:(dispatch_block_t)updateBlock
{
if (![self usesStandardContentView]) {
dispatch_async(dispatch_get_main_queue(), updateBlock);
return;
}

auto updateBlockCopy = makeBlockPtr(updateBlock);

if (_stableStatePresentationUpdateCallbacks)
[_stableStatePresentationUpdateCallbacks addObject:updateBlockCopy.get()];
else {
_stableStatePresentationUpdateCallbacks = adoptNS([[NSMutableArray alloc] initWithObjects:updateBlockCopy.get(), nil]);
[self _firePresentationUpdateForPendingStableStatePresentationCallbacks];
}
}

- (void)_setFont:(UIFont *)font sender:(id)sender
{
if (self.usesStandardContentView)
[_contentView _setFontForWebView:font sender:sender];
}

- (void)_setFontSize:(CGFloat)fontSize sender:(id)sender
{
if (self.usesStandardContentView)
[_contentView _setFontSizeForWebView:fontSize sender:sender];
}

- (void)_setTextColor:(UIColor *)color sender:(id)sender
{
if (self.usesStandardContentView)
[_contentView _setTextColorForWebView:color sender:sender];
}

- (void)_detectDataWithTypes:(WKDataDetectorTypes)types completionHandler:(dispatch_block_t)completion
{
#if ENABLE(DATA_DETECTION)
_page->detectDataInAllFrames(fromWKDataDetectorTypes(types), [completion = makeBlockPtr(completion), page = makeWeakPtr(_page.get())] (auto& result) {
if (page)
page->setDataDetectionResult(result);
if (completion)
completion();
});
#else
UNUSED_PARAM(types);
UNUSED_PARAM(completion);
#endif
}

- (void)_requestActivatedElementAtPosition:(CGPoint)position completionBlock:(void (^)(_WKActivatedElementInfo *))block
{
auto infoRequest = WebKit::InteractionInformationRequest(WebCore::roundedIntPoint(position));
infoRequest.includeSnapshot = true;

[_contentView doAfterPositionInformationUpdate:[capturedBlock = makeBlockPtr(block)] (WebKit::InteractionInformationAtPosition information) {
capturedBlock([_WKActivatedElementInfo activatedElementInfoWithInteractionInformationAtPosition:information userInfo:nil]);
} forRequest:infoRequest];
}

- (void)didStartFormControlInteraction
{
// For subclasses to override.
}

- (void)didEndFormControlInteraction
{
// For subclasses to override.
}

- (void)_beginInteractiveObscuredInsetsChange
{
ASSERT(!_isChangingObscuredInsetsInteractively);
_isChangingObscuredInsetsInteractively = YES;
}

- (void)_endInteractiveObscuredInsetsChange
{
ASSERT(_isChangingObscuredInsetsInteractively);
_isChangingObscuredInsetsInteractively = NO;
[self _scheduleVisibleContentRectUpdate];
}

- (void)_hideContentUntilNextUpdate
{
if (auto* area = _page->drawingArea())
area->hideContentUntilAnyUpdate();
}

- (void)_beginAnimatedResizeWithUpdates:(void (^)(void))updateBlock
{
CGRect oldBounds = self.bounds;
WebCore::FloatRect oldUnobscuredContentRect = _page->unobscuredContentRect();

if (![self usesStandardContentView] || !_hasCommittedLoadForMainFrame || CGRectIsEmpty(oldBounds) || oldUnobscuredContentRect.isEmpty()) {
if ([_customContentView respondsToSelector:@selector(web_beginAnimatedResizeWithUpdates:)])
[_customContentView web_beginAnimatedResizeWithUpdates:updateBlock];
else
updateBlock();
return;
}

RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _beginAnimatedResizeWithUpdates:]", self, _page->identifier().toUInt64());

_dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::ResizingWithAnimation;

auto oldMinimumEffectiveDeviceWidth = [self _minimumEffectiveDeviceWidth];
auto oldViewLayoutSize = [self activeViewLayoutSize:self.bounds];
auto oldMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, oldBounds);
int32_t oldOrientation = activeOrientation(self);
UIEdgeInsets oldObscuredInsets = _obscuredInsets;

updateBlock();

CGRect newBounds = self.bounds;
auto newMinimumEffectiveDeviceWidth = [self _minimumEffectiveDeviceWidth];
auto newViewLayoutSize = [self activeViewLayoutSize:newBounds];
auto newMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, newBounds);
int32_t newOrientation = activeOrientation(self);
UIEdgeInsets newObscuredInsets = _obscuredInsets;
CGRect futureUnobscuredRectInSelfCoordinates = UIEdgeInsetsInsetRect(newBounds, _obscuredInsets);
CGRect contentViewBounds = [_contentView bounds];

ASSERT_WITH_MESSAGE(!(_viewLayoutSizeOverride && newViewLayoutSize.isEmpty()), "Clients controlling the layout size should maintain a valid layout size to minimize layouts.");
if (CGRectIsEmpty(newBounds) || newViewLayoutSize.isEmpty() || CGRectIsEmpty(futureUnobscuredRectInSelfCoordinates) || CGRectIsEmpty(contentViewBounds)) {
[self _cancelAnimatedResize];
[self _frameOrBoundsChanged];
if (_viewLayoutSizeOverride)
[self _dispatchSetViewLayoutSize:newViewLayoutSize];
if (_maximumUnobscuredSizeOverride)
[self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(newMaximumUnobscuredSize)];
if (_overridesInterfaceOrientation)
[self _dispatchSetDeviceOrientation:newOrientation];

return;
}

if (CGRectEqualToRect(oldBounds, newBounds)
&& oldViewLayoutSize == newViewLayoutSize
&& oldMaximumUnobscuredSize == newMaximumUnobscuredSize
&& oldOrientation == newOrientation
&& oldMinimumEffectiveDeviceWidth == newMinimumEffectiveDeviceWidth
&& UIEdgeInsetsEqualToEdgeInsets(oldObscuredInsets, newObscuredInsets)) {
[self _cancelAnimatedResize];
return;
}

_resizeAnimationTransformAdjustments = CATransform3DIdentity;

if (!_resizeAnimationView) {
NSUInteger indexOfContentView = [[_scrollView subviews] indexOfObject:_contentView.get()];
_resizeAnimationView = adoptNS([[UIView alloc] init]);
[_resizeAnimationView layer].name = @"ResizeAnimation";
[_scrollView insertSubview:_resizeAnimationView.get() atIndex:indexOfContentView];
[_resizeAnimationView addSubview:_contentView.get()];
[_resizeAnimationView addSubview:[_contentView unscaledView]];
}

CGSize contentSizeInContentViewCoordinates = contentViewBounds.size;
[_scrollView setMinimumZoomScale:std::min(newViewLayoutSize.width() / contentSizeInContentViewCoordinates.width, [_scrollView minimumZoomScale])];
[_scrollView setMaximumZoomScale:std::max(newViewLayoutSize.width() / contentSizeInContentViewCoordinates.width, [_scrollView maximumZoomScale])];

// Compute the new scale to keep the current content width in the scrollview.
CGFloat oldWebViewWidthInContentViewCoordinates = oldUnobscuredContentRect.width();
_animatedResizeOriginalContentWidth = std::min(contentSizeInContentViewCoordinates.width, oldWebViewWidthInContentViewCoordinates);
CGFloat targetScale = newViewLayoutSize.width() / _animatedResizeOriginalContentWidth;
CGFloat resizeAnimationViewAnimationScale = targetScale / contentZoomScale(self);
[_resizeAnimationView setTransform:CGAffineTransformMakeScale(resizeAnimationViewAnimationScale, resizeAnimationViewAnimationScale)];

// Compute a new position to keep the content centered.
CGPoint originalContentCenter = oldUnobscuredContentRect.center();
CGPoint originalContentCenterInSelfCoordinates = [self convertPoint:originalContentCenter fromView:_contentView.get()];
CGPoint futureUnobscuredRectCenterInSelfCoordinates = CGPointMake(futureUnobscuredRectInSelfCoordinates.origin.x + futureUnobscuredRectInSelfCoordinates.size.width / 2, futureUnobscuredRectInSelfCoordinates.origin.y + futureUnobscuredRectInSelfCoordinates.size.height / 2);

CGPoint originalContentOffset = [_scrollView contentOffset];
CGPoint contentOffset = originalContentOffset;
contentOffset.x += (originalContentCenterInSelfCoordinates.x - futureUnobscuredRectCenterInSelfCoordinates.x);
contentOffset.y += (originalContentCenterInSelfCoordinates.y - futureUnobscuredRectCenterInSelfCoordinates.y);

// Limit the new offset within the scrollview, we do not want to rubber band programmatically.
CGSize futureContentSizeInSelfCoordinates = CGSizeMake(contentSizeInContentViewCoordinates.width * targetScale, contentSizeInContentViewCoordinates.height * targetScale);
CGFloat maxHorizontalOffset = futureContentSizeInSelfCoordinates.width - newBounds.size.width + _obscuredInsets.right;
contentOffset.x = std::min(contentOffset.x, maxHorizontalOffset);
CGFloat maxVerticalOffset = futureContentSizeInSelfCoordinates.height - newBounds.size.height + _obscuredInsets.bottom;
contentOffset.y = std::min(contentOffset.y, maxVerticalOffset);

contentOffset.x = std::max(contentOffset.x, -_obscuredInsets.left);
contentOffset.y = std::max(contentOffset.y, -_obscuredInsets.top);

// Make the top/bottom edges "sticky" within 1 pixel.
if (oldUnobscuredContentRect.maxY() > contentSizeInContentViewCoordinates.height - 1)
contentOffset.y = maxVerticalOffset;
if (oldUnobscuredContentRect.y() < 1)
contentOffset.y = [self _initialContentOffsetForScrollView].y;

// FIXME: if we have content centered after double tap to zoom, we should also try to keep that rect in view.
[_scrollView setContentSize:roundScrollViewContentSize(*_page, futureContentSizeInSelfCoordinates)];
[_scrollView setContentOffset:contentOffset];

CGRect visibleRectInContentCoordinates = [self convertRect:newBounds toView:_contentView.get()];
CGRect unobscuredRectInContentCoordinates = [self convertRect:futureUnobscuredRectInSelfCoordinates toView:_contentView.get()];

UIEdgeInsets unobscuredSafeAreaInsets = [self _computedUnobscuredSafeAreaInset];
WebCore::FloatBoxExtent unobscuredSafeAreaInsetsExtent(unobscuredSafeAreaInsets.top, unobscuredSafeAreaInsets.right, unobscuredSafeAreaInsets.bottom, unobscuredSafeAreaInsets.left);

_lastSentViewLayoutSize = newViewLayoutSize;
_lastSentMaximumUnobscuredSize = newMaximumUnobscuredSize;
_lastSentDeviceOrientation = newOrientation;

_page->dynamicViewportSizeUpdate(newViewLayoutSize, newMaximumUnobscuredSize, visibleRectInContentCoordinates, unobscuredRectInContentCoordinates, futureUnobscuredRectInSelfCoordinates, unobscuredSafeAreaInsetsExtent, targetScale, newOrientation, newMinimumEffectiveDeviceWidth, ++_currentDynamicViewportSizeUpdateID);
if (WebKit::DrawingAreaProxy* drawingArea = _page->drawingArea())
drawingArea->setSize(WebCore::IntSize(newBounds.size));

_waitingForCommitAfterAnimatedResize = YES;
_waitingForEndAnimatedResize = YES;
}

- (void)_endAnimatedResize
{
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _endAnimatedResize] _dynamicViewportUpdateMode %d", self, _page->identifier().toUInt64(), _dynamicViewportUpdateMode);

// If we already have an up-to-date layer tree, immediately complete
// the resize. Otherwise, we will defer completion until we do.
_waitingForEndAnimatedResize = NO;
if (!_waitingForCommitAfterAnimatedResize)
[self _didCompleteAnimatedResize];
}

- (void)_resizeWhileHidingContentWithUpdates:(void (^)(void))updateBlock
{
RELEASE_LOG_IF_ALLOWED("%p (pageProxyID=%llu) -[WKWebView _resizeWhileHidingContentWithUpdates:]", self, _page->identifier().toUInt64());

[self _beginAnimatedResizeWithUpdates:updateBlock];
if (_dynamicViewportUpdateMode == WebKit::DynamicViewportUpdateMode::ResizingWithAnimation) {
[_contentView setHidden:YES];
_dynamicViewportUpdateMode = WebKit::DynamicViewportUpdateMode::ResizingWithDocumentHidden;

// _resizeWhileHidingContentWithUpdates is used by itself; the client will
// not call endAnimatedResize, so we can't wait for it.
_waitingForEndAnimatedResize = NO;
}
}

- (void)_setSuppressSoftwareKeyboard:(BOOL)suppressSoftwareKeyboard
{
[super _setSuppressSoftwareKeyboard:suppressSoftwareKeyboard];
[_contentView _setSuppressSoftwareKeyboard:suppressSoftwareKeyboard];
}

- (void)_snapshotRect:(CGRect)rectInViewCoordinates intoImageOfWidth:(CGFloat)imageWidth completionHandler:(void(^)(CGImageRef))completionHandler
{
if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing) {
// Defer snapshotting until after the current resize completes.
void (^copiedCompletionHandler)(CGImageRef) = [completionHandler copy];
RetainPtr<WKWebView> retainedSelf = self;
_callbacksDeferredDuringResize.append([retainedSelf, rectInViewCoordinates, imageWidth, copiedCompletionHandler] {
[retainedSelf _snapshotRect:rectInViewCoordinates intoImageOfWidth:imageWidth completionHandler:copiedCompletionHandler];
[copiedCompletionHandler release];
});
return;
}

CGRect snapshotRectInContentCoordinates = [self convertRect:rectInViewCoordinates toView:self._currentContentView];
CGFloat imageScale = imageWidth / snapshotRectInContentCoordinates.size.width;
CGFloat imageHeight = imageScale * snapshotRectInContentCoordinates.size.height;
CGSize imageSize = CGSizeMake(imageWidth, imageHeight);

if ([[_customContentView class] web_requiresCustomSnapshotting]) {
[_customContentView web_snapshotRectInContentViewCoordinates:snapshotRectInContentCoordinates snapshotWidth:imageWidth completionHandler:completionHandler];
return;
}

#if HAVE(CORE_ANIMATION_RENDER_SERVER)
// If we are parented and not hidden, and thus won't incur a significant penalty from paging in tiles, snapshot the view hierarchy directly.
NSString *displayName = self.window.screen.displayConfiguration.name;
if (displayName && !self.window.hidden) {
auto surface = WebCore::IOSurface::create(WebCore::expandedIntSize(WebCore::FloatSize(imageSize)), WebCore::sRGBColorSpaceRef());
if (!surface) {
completionHandler(nullptr);
return;
}
CGFloat imageScaleInViewCoordinates = imageWidth / rectInViewCoordinates.size.width;
CATransform3D transform = CATransform3DMakeScale(imageScaleInViewCoordinates, imageScaleInViewCoordinates, 1);
transform = CATransform3DTranslate(transform, -rectInViewCoordinates.origin.x, -rectInViewCoordinates.origin.y, 0);
CARenderServerRenderDisplayLayerWithTransformAndTimeOffset(MACH_PORT_NULL, (CFStringRef)displayName, self.layer.context.contextId, reinterpret_cast<uint64_t>(self.layer), surface->surface(), 0, 0, &transform, 0);
completionHandler(WebCore::IOSurface::sinkIntoImage(WTFMove(surface)).get());
return;
}
#endif

if (_customContentView) {
ASSERT(![[_customContentView class] web_requiresCustomSnapshotting]);
UIGraphicsBeginImageContextWithOptions(imageSize, YES, 1);

UIView *customContentView = _customContentView.get();
[customContentView.backgroundColor set];
UIRectFill(CGRectMake(0, 0, imageWidth, imageHeight));

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, -snapshotRectInContentCoordinates.origin.x * imageScale, -snapshotRectInContentCoordinates.origin.y * imageScale);
CGContextScaleCTM(context, imageScale, imageScale);
[customContentView.layer renderInContext:context];

completionHandler([UIGraphicsGetImageFromCurrentImageContext() CGImage]);

UIGraphicsEndImageContext();
return;
}

void(^copiedCompletionHandler)(CGImageRef) = [completionHandler copy];
_page->takeSnapshot(WebCore::enclosingIntRect(snapshotRectInContentCoordinates), WebCore::expandedIntSize(WebCore::FloatSize(imageSize)), WebKit::SnapshotOptionsExcludeDeviceScaleFactor, [=](const WebKit::ShareableBitmap::Handle& imageHandle, WebKit::CallbackBase::Error) {
if (imageHandle.isNull()) {
copiedCompletionHandler(nullptr);
[copiedCompletionHandler release];
return;
}

auto bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);

if (!bitmap) {
copiedCompletionHandler(nullptr);
[copiedCompletionHandler release];
return;
}

RetainPtr<CGImageRef> cgImage;
cgImage = bitmap->makeCGImage();
copiedCompletionHandler(cgImage.get());
[copiedCompletionHandler release];
});
}

- (void)_overrideLayoutParametersWithMinimumLayoutSize:(CGSize)minimumLayoutSize maximumUnobscuredSizeOverride:(CGSize)maximumUnobscuredSizeOverride
{
LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->identifier() << " _overrideLayoutParametersWithMinimumLayoutSize:" << WebCore::FloatSize(minimumLayoutSize) << " maximumUnobscuredSizeOverride:" << WebCore::FloatSize(maximumUnobscuredSizeOverride) << "]");

if (minimumLayoutSize.width < 0 || minimumLayoutSize.height < 0)
RELEASE_LOG_FAULT(VisibleRects, "%s: Error: attempting to override layout parameters with negative width or height: %@", __PRETTY_FUNCTION__, NSStringFromCGSize(minimumLayoutSize));

[self _setViewLayoutSizeOverride:CGSizeMake(std::max<CGFloat>(0, minimumLayoutSize.width), std::max<CGFloat>(0, minimumLayoutSize.height))];
[self _setMaximumUnobscuredSizeOverride:maximumUnobscuredSizeOverride];
}

- (void)_clearOverrideLayoutParameters
{
_viewLayoutSizeOverride = WTF::nullopt;
_maximumUnobscuredSizeOverride = WTF::nullopt;
}

static WTF::Optional<WebCore::ViewportArguments> viewportArgumentsFromDictionary(NSDictionary<NSString *, NSString *> *viewportArgumentPairs, bool viewportFitEnabled)
{
if (!viewportArgumentPairs)
return WTF::nullopt;

WebCore::ViewportArguments viewportArguments(WebCore::ViewportArguments::ViewportMeta);

[viewportArgumentPairs enumerateKeysAndObjectsUsingBlock:makeBlockPtr([&] (NSString *key, NSString *value, BOOL* stop) {
if (![key isKindOfClass:[NSString class]] || ![value isKindOfClass:[NSString class]])
[NSException raise:NSInvalidArgumentException format:@"-[WKWebView _overrideViewportWithArguments:]: Keys and values must all be NSStrings."];
String keyString = key;
String valueString = value;
WebCore::setViewportFeature(viewportArguments, keyString, valueString, viewportFitEnabled, [] (WebCore::ViewportErrorCode, const String& errorMessage) {
NSLog(@"-[WKWebView _overrideViewportWithArguments:]: Error parsing viewport argument: %s", errorMessage.utf8().data());
});
}).get()];

return viewportArguments;
}

- (void)_overrideViewportWithArguments:(NSDictionary<NSString *, NSString *> *)arguments
{
if (!_page)
return;

_page->setOverrideViewportArguments(viewportArgumentsFromDictionary(arguments, _page->preferences().viewportFitEnabled()));
}

- (UIView *)_viewForFindUI
{
return [self viewForZoomingInScrollView:[self scrollView]];
}

- (void)_setOverlaidAccessoryViewsInset:(CGSize)inset
{
[_customContentView web_setOverlaidAccessoryViewsInset:inset];
}

- (void (^)(void))_retainActiveFocusedState
{
++_activeFocusedStateRetainCount;

// FIXME: Use something like CompletionHandlerCallChecker to ensure that the returned block is called before it's released.
return [[[self] {
--_activeFocusedStateRetainCount;
} copy] autorelease];
}

- (void)_becomeFirstResponderWithSelectionMovingForward:(BOOL)selectingForward completionHandler:(void (^)(BOOL didBecomeFirstResponder))completionHandler
{
typeof(completionHandler) completionHandlerCopy = nil;
if (completionHandler)
completionHandlerCopy = Block_copy(completionHandler);

[_contentView _becomeFirstResponderWithSelectionMovingForward:selectingForward completionHandler:[completionHandlerCopy](BOOL didBecomeFirstResponder) {
if (!completionHandlerCopy)
return;

completionHandlerCopy(didBecomeFirstResponder);
Block_release(completionHandlerCopy);
}];
}

- (id)_snapshotLayerContentsForBackForwardListItem:(WKBackForwardListItem *)item
{
if (_page->backForwardList().currentItem() == &item._item)
_page->recordNavigationSnapshot(*_page->backForwardList().currentItem());

if (auto* viewSnapshot = item._item.snapshot())
return viewSnapshot->asLayerContents();

return nil;
}

- (NSArray *)_dataDetectionResults
{
#if ENABLE(DATA_DETECTION)
return [_contentView _dataDetectionResults];
#else
return nil;
#endif
}

- (void)_accessibilityRetrieveRectsAtSelectionOffset:(NSInteger)offset withText:(NSString *)text completionHandler:(void (^)(NSArray<NSValue *> *rects))completionHandler
{
[_contentView _accessibilityRetrieveRectsAtSelectionOffset:offset withText:text completionHandler:[capturedCompletionHandler = makeBlockPtr(completionHandler)] (const Vector<WebCore::SelectionRect>& selectionRects) {
if (!capturedCompletionHandler)
return;
capturedCompletionHandler(createNSArray(selectionRects, [] (auto& rect) {
return [NSValue valueWithCGRect:rect.rect()];
}).get());
}];
}

- (void)_accessibilityStoreSelection
{
[_contentView _accessibilityStoreSelection];
}

- (void)_accessibilityClearSelection
{
[_contentView _accessibilityClearSelection];
}

- (void)_accessibilityRetrieveSpeakSelectionContent
{
[_contentView accessibilityRetrieveSpeakSelectionContent];
}

// This method is for subclasses to override.
// Currently it's only in TestRunnerWKWebView.
- (void)_accessibilityDidGetSpeakSelectionContent:(NSString *)content
{
}

- (UIView *)_fullScreenPlaceholderView
{
#if ENABLE(FULLSCREEN_API)
if ([_fullScreenWindowController isFullScreen])
return [_fullScreenWindowController webViewPlaceholder];
#endif // ENABLE(FULLSCREEN_API)
return nil;
}

- (void)_grantAccessToAssetServices
{
#if PLATFORM(IOS)
if (_page)
_page->grantAccessToAssetServices();
#endif
}

- (void)_revokeAccessToAssetServices
{
#if PLATFORM(IOS)
if (_page)
_page->revokeAccessToAssetServices();
#endif
}

- (void)_willOpenAppLink
{
if (_page)
_page->willOpenAppLink();
}

- (void)_isNavigatingToAppBoundDomain:(void(^)(BOOL))completionHandler
{
_page->isNavigatingToAppBoundDomainTesting([completionHandler = makeBlockPtr(completionHandler)] (bool isAppBound) {
completionHandler(isAppBound);
});
}

- (void)_isForcedIntoAppBoundMode:(void(^)(BOOL))completionHandler
{
_page->isForcedIntoAppBoundModeTesting([completionHandler = makeBlockPtr(completionHandler)] (bool isForcedIntoAppBoundMode) {
completionHandler(isForcedIntoAppBoundMode);
});
}

@end // WKWebView (WKPrivateIOS)

#if ENABLE(FULLSCREEN_API)

@implementation WKWebView (FullScreenAPI_Private)

- (BOOL)hasFullScreenWindowController
{
return !!_fullScreenWindowController;
}

- (void)closeFullScreenWindowController
{
if (!_fullScreenWindowController)
return;

[_fullScreenWindowController close];
_fullScreenWindowController = nullptr;
}

@end

@implementation WKWebView (FullScreenAPI_Internal)

- (WKFullScreenWindowController *)fullScreenWindowController
{
if (!_fullScreenWindowController)
_fullScreenWindowController = adoptNS([[WKFullScreenWindowController alloc] initWithWebView:self]);

return _fullScreenWindowController.get();
}

@end

#endif // ENABLE(FULLSCREEN_API)

@implementation WKWebView (_WKWebViewPrintFormatter)

- (Class)_printFormatterClass
{
return [_WKWebViewPrintFormatter class];
}

- (id <_WKWebViewPrintProvider>)_printProvider
{
id printProvider = _customContentView ? _customContentView.get() : _contentView.get();
if ([printProvider conformsToProtocol:@protocol(_WKWebViewPrintProvider)])
return printProvider;
return nil;
}

@end

#endif // PLATFORM(IOS_FAMILY)