ios/chrome/browser/ui/omnibox/popup/omnibox_popup_presenter.mm - chromium/src - Git at Google

 // Copyright 2018 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #import "ios/chrome/browser/ui/omnibox/popup/omnibox_popup_presenter.h"

 #import "base/time/time.h"
 #import "ios/chrome/browser/shared/public/features/features.h"
 #import "ios/chrome/browser/shared/ui/util/layout_guide_names.h"
 #import "ios/chrome/browser/shared/ui/util/uikit_ui_util.h"
 #import "ios/chrome/browser/shared/ui/util/util_swift.h"
 #import "ios/chrome/browser/ui/omnibox/omnibox_ui_features.h"
 #import "ios/chrome/browser/ui/omnibox/popup/content_providing.h"
 #import "ios/chrome/browser/ui/toolbar/buttons/toolbar_configuration.h"
 #import "ios/chrome/browser/ui/toolbar/public/toolbar_constants.h"
 #import "ios/chrome/common/ui/colors/semantic_color_names.h"
 #import "ios/chrome/common/ui/util/constraints_ui_util.h"
 #import "ios/chrome/common/ui/util/ui_util.h"
 #import "ios/chrome/grit/ios_theme_resources.h"
 #import "ui/base/device_form_factor.h"
 #import "ui/gfx/ios/uikit_util.h"

 namespace {
 const CGFloat kVerticalOffset = 6;
 const CGFloat kPopupBottomPaddingTablet = 80;

 /// Duration of the fade in animation.
 constexpr NSTimeInterval kFadeInAnimationDuration =
     base::Milliseconds(300).InSecondsF();
 /// Vertical offset of the suggestions when fading in.
 const CGFloat kFadeAnimationVerticalOffset = 12;

 }  // namespace

 @interface OmniboxPopupPresenter ()
 /// Constraint for the bottom anchor of the popup when form factor is phone.
 @property(nonatomic, strong) NSLayoutConstraint* bottomConstraintPhone;
 /// Constraint for the bottom anchor of the popup when form factor is tablet.
 @property(nonatomic, strong) NSLayoutConstraint* bottomConstraintTablet;

 @property(nonatomic, weak) id<OmniboxPopupPresenterDelegate> delegate;
 @property(nonatomic, weak) UIViewController<ContentProviding>* viewController;
 @property(nonatomic, strong) UIView* popupContainerView;
 /// Separator for the bottom edge of the popup on iPad.
 @property(nonatomic, strong) UIView* bottomSeparator;
 /// Top constraint between the popup and it's container. This is used to animate
 /// suggestions when focusing the omnibox.
 @property(nonatomic, strong) NSLayoutConstraint* popupTopConstraint;

 // The layout guide center to use to refer to the omnibox.
 @property(nonatomic, strong) LayoutGuideCenter* layoutGuideCenter;
 @property(nonatomic, strong) UILayoutGuide* topOmniboxGuide;

 @end

 @implementation OmniboxPopupPresenter {
   /// Type of the toolbar that contains the omnibox when it's not focused. The
   /// animation of focusing/defocusing the omnibox changes depending on this
   /// position.
   ToolbarType _unfocusedOmniboxToolbarType;
 }

 - (instancetype)
     initWithPopupPresenterDelegate:(id<OmniboxPopupPresenterDelegate>)delegate
                popupViewController:
                    (UIViewController<ContentProviding>*)viewController
                  layoutGuideCenter:(LayoutGuideCenter*)layoutGuideCenter
                          incognito:(BOOL)incognito {
   self = [super init];
   if (self) {
     _delegate = delegate;
     _viewController = viewController;
     _layoutGuideCenter = layoutGuideCenter;

     // Popup uses same colors as the toolbar, so the ToolbarConfiguration is
     // used to get the style.
     ToolbarConfiguration* configuration = [[ToolbarConfiguration alloc]
         initWithStyle:incognito ? ToolbarStyle::kIncognito
                                 : ToolbarStyle::kNormal];

     UIView* containerView = [[UIView alloc] init];
     [containerView addSubview:viewController.view];
     _popupContainerView = containerView;

     UIUserInterfaceStyle userInterfaceStyle =
         incognito ? UIUserInterfaceStyleDark : UIUserInterfaceStyleUnspecified;
     // Both the container view and the popup view controller need
     // overrideUserInterfaceStyle set because the overall popup background
     // comes from the container, but overrideUserInterfaceStyle won't
     // propagate from a view to any subviews in a different view controller.
     _popupContainerView.overrideUserInterfaceStyle = userInterfaceStyle;
     viewController.overrideUserInterfaceStyle = userInterfaceStyle;

     if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
       _popupContainerView.backgroundColor =
           [UIColor colorNamed:kPrimaryBackgroundColor];
     } else {
       _popupContainerView.backgroundColor = configuration.backgroundColor;
     }

     _popupContainerView.translatesAutoresizingMaskIntoConstraints = NO;
     viewController.view.translatesAutoresizingMaskIntoConstraints = NO;

     if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
       self.viewController.view.layer.masksToBounds = YES;

       AddSameConstraints(viewController.view, _popupContainerView);
     } else {
       AddSameConstraintsToSides(viewController.view, _popupContainerView,
                                 LayoutSides::kLeading | LayoutSides::kTrailing |
                                     LayoutSides::kBottom);
       _popupTopConstraint = [viewController.view.topAnchor
           constraintEqualToAnchor:_popupContainerView.topAnchor];
       _popupTopConstraint.active = YES;

       // Add bottom separator. This will only be visible on iPad where
       // the omnibox doesn't fill the whole screen.
       _bottomSeparator = [[UIView alloc] initWithFrame:CGRectZero];
       _bottomSeparator.translatesAutoresizingMaskIntoConstraints = NO;
       _bottomSeparator.backgroundColor =
           [UIColor colorNamed:kToolbarShadowColor];

       [_popupContainerView addSubview:self.bottomSeparator];

       CGFloat separatorHeight =
           ui::AlignValueToUpperPixel(kToolbarSeparatorHeight);
       [NSLayoutConstraint activateConstraints:@[
         [self.bottomSeparator.heightAnchor
             constraintEqualToConstant:separatorHeight],
         [self.bottomSeparator.leadingAnchor
             constraintEqualToAnchor:_popupContainerView.leadingAnchor],
         [self.bottomSeparator.trailingAnchor
             constraintEqualToAnchor:_popupContainerView.trailingAnchor],
         [self.bottomSeparator.topAnchor
             constraintEqualToAnchor:_popupContainerView.bottomAnchor],
       ]];
     }
   }
   return self;
 }

 - (void)updatePopupOnFocus:(BOOL)isFocusingOmnibox {
   BOOL popupHasContent = self.viewController.hasContent;
   BOOL popupIsOnscreen = self.popupContainerView.superview != nil;
   if (!popupHasContent && popupIsOnscreen) {
     // If intrinsic size is 0 and popup is onscreen, we want to remove the
     // popup view.
     if (ui::GetDeviceFormFactor() != ui::DEVICE_FORM_FACTOR_TABLET) {
       self.bottomConstraintPhone.active = NO;
       self.bottomSeparator.hidden = YES;
     }

     [self.viewController willMoveToParentViewController:nil];
     [self.popupContainerView removeFromSuperview];
     [self.viewController removeFromParentViewController];

     self.open = NO;
     [self.delegate popupDidCloseForPresenter:self];
   } else if (popupHasContent && !popupIsOnscreen) {
     // If intrinsic size is nonzero and popup is offscreen, we want to add it.
     UIViewController* parentVC =
         [self.delegate popupParentViewControllerForPresenter:self];
     [parentVC addChildViewController:self.viewController];
     [[self.delegate popupParentViewForPresenter:self]
         addSubview:self.popupContainerView];
     [self.viewController didMoveToParentViewController:parentVC];

     BOOL enableFocusAnimation =
         IsBottomOmniboxAvailable() && isFocusingOmnibox &&
         _unfocusedOmniboxToolbarType == ToolbarType::kSecondary;

     [self initialLayoutAnimated:enableFocusAnimation];

     [self updateBottomConstraints];

     self.open = YES;
     [self.delegate popupDidOpenForPresenter:self];
   }
 }

 /// With popout omnibox, the popup might be in either of two states:
 /// a) regular x regular state, where the popup matches OB width
 /// b) compact state, where popup takes whole screen width
 /// Therefore, on trait collection change, re-add the popup and recreate the
 /// constraints to make sure the correct ones are used.
 - (void)updatePopupAfterTraitCollectionChange {
   // Re-add the popup container to break any existing constraints.
   [self.popupContainerView removeFromSuperview];
   [[self.delegate popupParentViewForPresenter:self]
       addSubview:self.popupContainerView];

   // Re-add necessary constraints.
   [self initialLayoutAnimated:NO];
   [self updateBottomConstraints];
 }

 - (void)updateBottomConstraints {
   if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
     BOOL showRegularLayout =
         IsRegularXRegularSizeClass(self.popupContainerView.traitCollection);
     self.bottomConstraintPhone.active = !showRegularLayout;
     self.bottomConstraintTablet.active = showRegularLayout;
   } else {
     self.bottomConstraintPhone.active = YES;
     self.bottomSeparator.hidden = NO;
   }
 }

 #pragma mark - ToolbarOmniboxConsumer

 - (void)steadyStateOmniboxMovedToToolbar:(ToolbarType)toolbarType {
   _unfocusedOmniboxToolbarType = toolbarType;
 }

 #pragma mark - Private

 /// Layouts the popup when it is just added to the view hierarchy.
 - (void)initialLayoutAnimated:(BOOL)isAnimated {
   UIView* popup = self.popupContainerView;
   // Creates the constraints if the view is newly added to the view hierarchy.

   if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
     self.bottomConstraintPhone = [popup.superview.safeAreaLayoutGuide
                                       .bottomAnchor
         constraintGreaterThanOrEqualToAnchor:popup.bottomAnchor
                                     constant:
                                         kPopupBottomPaddingTablet +
                                         kSecondaryToolbarWithoutOmniboxHeight];
   } else {
     self.bottomConstraintPhone = [popup.bottomAnchor
         constraintEqualToAnchor:popup.superview.bottomAnchor];
   }

   // On tablet form factor the popup is padded on the bottom to allow the user
   // to defocus the omnibox.
   self.bottomConstraintTablet = [popup.superview.bottomAnchor
       constraintGreaterThanOrEqualToAnchor:popup.bottomAnchor
                                   constant:kPopupBottomPaddingTablet];

   // Install in the superview the guide tracking the top omnibox.
   if (self.topOmniboxGuide) {
     [[popup superview] removeLayoutGuide:self.topOmniboxGuide];
     self.topOmniboxGuide = nil;
   }
   GuideName* omniboxGuideName =
       [self.delegate omniboxGuideNameForPresenter:self];
   if (omniboxGuideName) {
     self.topOmniboxGuide =
         [self.layoutGuideCenter makeLayoutGuideNamed:omniboxGuideName];
     [[popup superview] addLayoutGuide:self.topOmniboxGuide];
   }

   [self updatePopupLayer];
   [self updateConstraints];

   [[popup superview] layoutIfNeeded];

   if (isAnimated) {
     [self animatePopupOnOmniboxFocus];
   }
 }

 // Updates the popup's view layer.
 - (void)updatePopupLayer {
   if (ui::GetDeviceFormFactor() != ui::DEVICE_FORM_FACTOR_TABLET) {
     return;
   }

   _popupContainerView.layer.masksToBounds = NO;

   BOOL showRegularLayout =
       IsRegularXRegularSizeClass(self.popupContainerView.traitCollection);

   _popupContainerView.layer.cornerRadius = showRegularLayout ? 16 : 0;
   _popupContainerView.layer.shadowColor = UIColor.blackColor.CGColor;
   _popupContainerView.layer.shadowRadius = 60;
   _popupContainerView.layer.shadowOffset = CGSizeMake(0, 10);
   _popupContainerView.layer.shadowOpacity = 0.2;
   self.viewController.view.layer.cornerRadius = showRegularLayout ? 16 : 0;
 }

 // Updates and activates the constraints based on the popup's current view state
 - (void)updateConstraints {
   UIView* popup = self.popupContainerView;

   NSLayoutConstraint* topConstraint;
   if (self.topOmniboxGuide) {
     // Position the top anchor of the popup relatively to that layout guide.
     topConstraint = [popup.topAnchor
         constraintEqualToAnchor:self.topOmniboxGuide.bottomAnchor
                        constant:kVerticalOffset];
   } else {
     topConstraint = [popup.topAnchor
         constraintEqualToAnchor:[self.delegate popupParentViewForPresenter:self]
                                     .topAnchor];
   }

   NSMutableArray<NSLayoutConstraint*>* constraintsToActivate =
       [NSMutableArray arrayWithObject:topConstraint];

   if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET &&
       IsRegularXRegularSizeClass(self.popupContainerView.traitCollection) &&
       self.topOmniboxGuide) {
     NSLayoutConstraint* leadingConstraint = [popup.leadingAnchor
         constraintEqualToAnchor:self.topOmniboxGuide.leadingAnchor
                        constant:-16];
     leadingConstraint.priority = UILayoutPriorityDefaultHigh;

     NSLayoutConstraint* trailingConstraint = [popup.trailingAnchor
         constraintEqualToAnchor:self.topOmniboxGuide.trailingAnchor
                        constant:16];
     trailingConstraint.priority = UILayoutPriorityDefaultHigh;

     NSLayoutConstraint* centerXConstraint = [popup.centerXAnchor
         constraintEqualToAnchor:self.topOmniboxGuide.centerXAnchor];

     [constraintsToActivate addObjectsFromArray:@[
       leadingConstraint, trailingConstraint, centerXConstraint
     ]];
   } else {
     [constraintsToActivate addObjectsFromArray:@[
       [popup.leadingAnchor
           constraintEqualToAnchor:popup.superview.leadingAnchor],
       [popup.trailingAnchor
           constraintEqualToAnchor:popup.superview.trailingAnchor],
     ]];
   }

   [NSLayoutConstraint activateConstraints:constraintsToActivate];
 }

 /// Animates the popup for omnibox focus.
 - (void)animatePopupOnOmniboxFocus {
   __weak __typeof__(self) weakSelf = self;
   self.viewController.view.alpha = 0.0;
   self.popupTopConstraint.constant = kFadeAnimationVerticalOffset;
   [self.popupContainerView.superview layoutIfNeeded];

   auto constraintForVisiblePopup = ^{
     weakSelf.viewController.view.alpha = 1.0;
     weakSelf.popupTopConstraint.constant = 0.0;
     [weakSelf.popupContainerView.superview layoutIfNeeded];
   };

   [UIView animateWithDuration:kFadeInAnimationDuration
                    animations:constraintForVisiblePopup
                    completion:^(BOOL _) {
                      constraintForVisiblePopup();
                    }];
 }

 @end
	// Copyright 2018 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#import "ios/chrome/browser/ui/omnibox/popup/omnibox_popup_presenter.h"

	#import "base/time/time.h"
	#import "ios/chrome/browser/shared/public/features/features.h"
	#import "ios/chrome/browser/shared/ui/util/layout_guide_names.h"
	#import "ios/chrome/browser/shared/ui/util/uikit_ui_util.h"
	#import "ios/chrome/browser/shared/ui/util/util_swift.h"
	#import "ios/chrome/browser/ui/omnibox/omnibox_ui_features.h"
	#import "ios/chrome/browser/ui/omnibox/popup/content_providing.h"
	#import "ios/chrome/browser/ui/toolbar/buttons/toolbar_configuration.h"
	#import "ios/chrome/browser/ui/toolbar/public/toolbar_constants.h"
	#import "ios/chrome/common/ui/colors/semantic_color_names.h"
	#import "ios/chrome/common/ui/util/constraints_ui_util.h"
	#import "ios/chrome/common/ui/util/ui_util.h"
	#import "ios/chrome/grit/ios_theme_resources.h"
	#import "ui/base/device_form_factor.h"
	#import "ui/gfx/ios/uikit_util.h"

	namespace {
	const CGFloat kVerticalOffset = 6;
	const CGFloat kPopupBottomPaddingTablet = 80;

	/// Duration of the fade in animation.
	constexpr NSTimeInterval kFadeInAnimationDuration =
	base::Milliseconds(300).InSecondsF();
	/// Vertical offset of the suggestions when fading in.
	const CGFloat kFadeAnimationVerticalOffset = 12;

	} // namespace

	@interface OmniboxPopupPresenter ()
	/// Constraint for the bottom anchor of the popup when form factor is phone.
	@property(nonatomic, strong) NSLayoutConstraint* bottomConstraintPhone;
	/// Constraint for the bottom anchor of the popup when form factor is tablet.
	@property(nonatomic, strong) NSLayoutConstraint* bottomConstraintTablet;

	@property(nonatomic, weak) id<OmniboxPopupPresenterDelegate> delegate;
	@property(nonatomic, weak) UIViewController<ContentProviding>* viewController;
	@property(nonatomic, strong) UIView* popupContainerView;
	/// Separator for the bottom edge of the popup on iPad.
	@property(nonatomic, strong) UIView* bottomSeparator;
	/// Top constraint between the popup and it's container. This is used to animate
	/// suggestions when focusing the omnibox.
	@property(nonatomic, strong) NSLayoutConstraint* popupTopConstraint;

	// The layout guide center to use to refer to the omnibox.
	@property(nonatomic, strong) LayoutGuideCenter* layoutGuideCenter;
	@property(nonatomic, strong) UILayoutGuide* topOmniboxGuide;

	@end

	@implementation OmniboxPopupPresenter {
	/// Type of the toolbar that contains the omnibox when it's not focused. The
	/// animation of focusing/defocusing the omnibox changes depending on this
	/// position.
	ToolbarType _unfocusedOmniboxToolbarType;
	}

	- (instancetype)
	initWithPopupPresenterDelegate:(id<OmniboxPopupPresenterDelegate>)delegate
	popupViewController:
	(UIViewController<ContentProviding>*)viewController
	layoutGuideCenter:(LayoutGuideCenter*)layoutGuideCenter
	incognito:(BOOL)incognito {
	self = [super init];
	if (self) {
	_delegate = delegate;
	_viewController = viewController;
	_layoutGuideCenter = layoutGuideCenter;

	// Popup uses same colors as the toolbar, so the ToolbarConfiguration is
	// used to get the style.
	ToolbarConfiguration* configuration = [[ToolbarConfiguration alloc]
	initWithStyle:incognito ? ToolbarStyle::kIncognito
	: ToolbarStyle::kNormal];

	UIView* containerView = [[UIView alloc] init];
	[containerView addSubview:viewController.view];
	_popupContainerView = containerView;

	UIUserInterfaceStyle userInterfaceStyle =
	incognito ? UIUserInterfaceStyleDark : UIUserInterfaceStyleUnspecified;
	// Both the container view and the popup view controller need
	// overrideUserInterfaceStyle set because the overall popup background
	// comes from the container, but overrideUserInterfaceStyle won't
	// propagate from a view to any subviews in a different view controller.
	_popupContainerView.overrideUserInterfaceStyle = userInterfaceStyle;
	viewController.overrideUserInterfaceStyle = userInterfaceStyle;

	if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
	_popupContainerView.backgroundColor =
	[UIColor colorNamed:kPrimaryBackgroundColor];
	} else {
	_popupContainerView.backgroundColor = configuration.backgroundColor;
	}

	_popupContainerView.translatesAutoresizingMaskIntoConstraints = NO;
	viewController.view.translatesAutoresizingMaskIntoConstraints = NO;

	if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
	self.viewController.view.layer.masksToBounds = YES;

	AddSameConstraints(viewController.view, _popupContainerView);
	} else {
	AddSameConstraintsToSides(viewController.view, _popupContainerView,
	LayoutSides::kLeading \| LayoutSides::kTrailing \|
	LayoutSides::kBottom);
	_popupTopConstraint = [viewController.view.topAnchor
	constraintEqualToAnchor:_popupContainerView.topAnchor];
	_popupTopConstraint.active = YES;

	// Add bottom separator. This will only be visible on iPad where
	// the omnibox doesn't fill the whole screen.
	_bottomSeparator = [[UIView alloc] initWithFrame:CGRectZero];
	_bottomSeparator.translatesAutoresizingMaskIntoConstraints = NO;
	_bottomSeparator.backgroundColor =
	[UIColor colorNamed:kToolbarShadowColor];

	[_popupContainerView addSubview:self.bottomSeparator];

	CGFloat separatorHeight =
	ui::AlignValueToUpperPixel(kToolbarSeparatorHeight);
	[NSLayoutConstraint activateConstraints:@[
	[self.bottomSeparator.heightAnchor
	constraintEqualToConstant:separatorHeight],
	[self.bottomSeparator.leadingAnchor
	constraintEqualToAnchor:_popupContainerView.leadingAnchor],
	[self.bottomSeparator.trailingAnchor
	constraintEqualToAnchor:_popupContainerView.trailingAnchor],
	[self.bottomSeparator.topAnchor
	constraintEqualToAnchor:_popupContainerView.bottomAnchor],
	]];
	}
	}
	return self;
	}

	- (void)updatePopupOnFocus:(BOOL)isFocusingOmnibox {
	BOOL popupHasContent = self.viewController.hasContent;
	BOOL popupIsOnscreen = self.popupContainerView.superview != nil;
	if (!popupHasContent && popupIsOnscreen) {
	// If intrinsic size is 0 and popup is onscreen, we want to remove the
	// popup view.
	if (ui::GetDeviceFormFactor() != ui::DEVICE_FORM_FACTOR_TABLET) {
	self.bottomConstraintPhone.active = NO;
	self.bottomSeparator.hidden = YES;
	}

	[self.viewController willMoveToParentViewController:nil];
	[self.popupContainerView removeFromSuperview];
	[self.viewController removeFromParentViewController];

	self.open = NO;
	[self.delegate popupDidCloseForPresenter:self];
	} else if (popupHasContent && !popupIsOnscreen) {
	// If intrinsic size is nonzero and popup is offscreen, we want to add it.
	UIViewController* parentVC =
	[self.delegate popupParentViewControllerForPresenter:self];
	[parentVC addChildViewController:self.viewController];
	[[self.delegate popupParentViewForPresenter:self]
	addSubview:self.popupContainerView];
	[self.viewController didMoveToParentViewController:parentVC];

	BOOL enableFocusAnimation =
	IsBottomOmniboxAvailable() && isFocusingOmnibox &&
	_unfocusedOmniboxToolbarType == ToolbarType::kSecondary;

	[self initialLayoutAnimated:enableFocusAnimation];

	[self updateBottomConstraints];

	self.open = YES;
	[self.delegate popupDidOpenForPresenter:self];
	}
	}

	/// With popout omnibox, the popup might be in either of two states:
	/// a) regular x regular state, where the popup matches OB width
	/// b) compact state, where popup takes whole screen width
	/// Therefore, on trait collection change, re-add the popup and recreate the
	/// constraints to make sure the correct ones are used.
	- (void)updatePopupAfterTraitCollectionChange {
	// Re-add the popup container to break any existing constraints.
	[self.popupContainerView removeFromSuperview];
	[[self.delegate popupParentViewForPresenter:self]
	addSubview:self.popupContainerView];

	// Re-add necessary constraints.
	[self initialLayoutAnimated:NO];
	[self updateBottomConstraints];
	}

	- (void)updateBottomConstraints {
	if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
	BOOL showRegularLayout =
	IsRegularXRegularSizeClass(self.popupContainerView.traitCollection);
	self.bottomConstraintPhone.active = !showRegularLayout;
	self.bottomConstraintTablet.active = showRegularLayout;
	} else {
	self.bottomConstraintPhone.active = YES;
	self.bottomSeparator.hidden = NO;
	}
	}

	#pragma mark - ToolbarOmniboxConsumer

	- (void)steadyStateOmniboxMovedToToolbar:(ToolbarType)toolbarType {
	_unfocusedOmniboxToolbarType = toolbarType;
	}

	#pragma mark - Private

	/// Layouts the popup when it is just added to the view hierarchy.
	- (void)initialLayoutAnimated:(BOOL)isAnimated {
	UIView* popup = self.popupContainerView;
	// Creates the constraints if the view is newly added to the view hierarchy.

	if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET) {
	self.bottomConstraintPhone = [popup.superview.safeAreaLayoutGuide
	.bottomAnchor
	constraintGreaterThanOrEqualToAnchor:popup.bottomAnchor
	constant:
	kPopupBottomPaddingTablet +
	kSecondaryToolbarWithoutOmniboxHeight];
	} else {
	self.bottomConstraintPhone = [popup.bottomAnchor
	constraintEqualToAnchor:popup.superview.bottomAnchor];
	}

	// On tablet form factor the popup is padded on the bottom to allow the user
	// to defocus the omnibox.
	self.bottomConstraintTablet = [popup.superview.bottomAnchor
	constraintGreaterThanOrEqualToAnchor:popup.bottomAnchor
	constant:kPopupBottomPaddingTablet];

	// Install in the superview the guide tracking the top omnibox.
	if (self.topOmniboxGuide) {
	[[popup superview] removeLayoutGuide:self.topOmniboxGuide];
	self.topOmniboxGuide = nil;
	}
	GuideName* omniboxGuideName =
	[self.delegate omniboxGuideNameForPresenter:self];
	if (omniboxGuideName) {
	self.topOmniboxGuide =
	[self.layoutGuideCenter makeLayoutGuideNamed:omniboxGuideName];
	[[popup superview] addLayoutGuide:self.topOmniboxGuide];
	}

	[self updatePopupLayer];
	[self updateConstraints];

	[[popup superview] layoutIfNeeded];

	if (isAnimated) {
	[self animatePopupOnOmniboxFocus];
	}
	}

	// Updates the popup's view layer.
	- (void)updatePopupLayer {
	if (ui::GetDeviceFormFactor() != ui::DEVICE_FORM_FACTOR_TABLET) {
	return;
	}

	_popupContainerView.layer.masksToBounds = NO;

	BOOL showRegularLayout =
	IsRegularXRegularSizeClass(self.popupContainerView.traitCollection);

	_popupContainerView.layer.cornerRadius = showRegularLayout ? 16 : 0;
	_popupContainerView.layer.shadowColor = UIColor.blackColor.CGColor;
	_popupContainerView.layer.shadowRadius = 60;
	_popupContainerView.layer.shadowOffset = CGSizeMake(0, 10);
	_popupContainerView.layer.shadowOpacity = 0.2;
	self.viewController.view.layer.cornerRadius = showRegularLayout ? 16 : 0;
	}

	// Updates and activates the constraints based on the popup's current view state
	- (void)updateConstraints {
	UIView* popup = self.popupContainerView;

	NSLayoutConstraint* topConstraint;
	if (self.topOmniboxGuide) {
	// Position the top anchor of the popup relatively to that layout guide.
	topConstraint = [popup.topAnchor
	constraintEqualToAnchor:self.topOmniboxGuide.bottomAnchor
	constant:kVerticalOffset];
	} else {
	topConstraint = [popup.topAnchor
	constraintEqualToAnchor:[self.delegate popupParentViewForPresenter:self]
	.topAnchor];
	}

	NSMutableArray<NSLayoutConstraint> constraintsToActivate =
	[NSMutableArray arrayWithObject:topConstraint];

	if (ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_TABLET &&
	IsRegularXRegularSizeClass(self.popupContainerView.traitCollection) &&
	self.topOmniboxGuide) {
	NSLayoutConstraint* leadingConstraint = [popup.leadingAnchor
	constraintEqualToAnchor:self.topOmniboxGuide.leadingAnchor
	constant:-16];
	leadingConstraint.priority = UILayoutPriorityDefaultHigh;

	NSLayoutConstraint* trailingConstraint = [popup.trailingAnchor
	constraintEqualToAnchor:self.topOmniboxGuide.trailingAnchor
	constant:16];
	trailingConstraint.priority = UILayoutPriorityDefaultHigh;

	NSLayoutConstraint* centerXConstraint = [popup.centerXAnchor
	constraintEqualToAnchor:self.topOmniboxGuide.centerXAnchor];

	[constraintsToActivate addObjectsFromArray:@[
	leadingConstraint, trailingConstraint, centerXConstraint
	]];
	} else {
	[constraintsToActivate addObjectsFromArray:@[
	[popup.leadingAnchor
	constraintEqualToAnchor:popup.superview.leadingAnchor],
	[popup.trailingAnchor
	constraintEqualToAnchor:popup.superview.trailingAnchor],
	]];
	}

	[NSLayoutConstraint activateConstraints:constraintsToActivate];
	}

	/// Animates the popup for omnibox focus.
	- (void)animatePopupOnOmniboxFocus {
	__weak __typeof__(self) weakSelf = self;
	self.viewController.view.alpha = 0.0;
	self.popupTopConstraint.constant = kFadeAnimationVerticalOffset;
	[self.popupContainerView.superview layoutIfNeeded];

	auto constraintForVisiblePopup = ^{
	weakSelf.viewController.view.alpha = 1.0;
	weakSelf.popupTopConstraint.constant = 0.0;
	[weakSelf.popupContainerView.superview layoutIfNeeded];
	};

	[UIView animateWithDuration:kFadeInAnimationDuration
	animations:constraintForVisiblePopup
	completion:^(BOOL _) {
	constraintForVisiblePopup();
	}];
	}

	@end