ios/chrome/browser/ui/popup_menu/cells/popup_menu_tools_item.mm - chromium/src - Git at Google

 // Copyright 2018 The Chromium Authors. All rights reserved.
 // 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/popup_menu/cells/popup_menu_tools_item.h"

 #include <stdlib.h>

 #include "base/logging.h"
 #import "ios/chrome/browser/ui/popup_menu/public/popup_menu_ui_constants.h"
 #import "ios/chrome/browser/ui/reading_list/number_badge_view.h"
 #import "ios/chrome/browser/ui/reading_list/text_badge_view.h"
 #import "ios/chrome/browser/ui/table_view/chrome_table_view_styler.h"
 #import "ios/chrome/browser/ui/util/uikit_ui_util.h"
 #import "ios/chrome/common/material_timing.h"
 #import "ios/chrome/common/ui_util/constraints_ui_util.h"

 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif

 namespace {
 const int kEnabledDefaultColor = 0x1A73E8;
 const int kEnabledDestructiveColor = 0xEA4334;
 const CGFloat kImageLength = 28;
 const CGFloat kCellHeight = 44;
 const CGFloat kInnerMargin = 11;
 const CGFloat kMargin = 15;
 const CGFloat kTopMargin = 8;
 const CGFloat kMaxHeight = 100;
 NSString* const kToolsMenuTextBadgeAccessibilityIdentifier =
     @"kToolsMenuTextBadgeAccessibilityIdentifier";
 }  // namespace

 @implementation PopupMenuToolsItem

 @synthesize actionIdentifier = _actionIdentifier;
 @synthesize badgeNumber = _badgeNumber;
 @synthesize badgeText = _badgeText;
 @synthesize image = _image;
 @synthesize title = _title;
 @synthesize enabled = _enabled;
 @synthesize destructiveAction = _destructiveAction;

 - (instancetype)initWithType:(NSInteger)type {
   self = [super initWithType:type];
   if (self) {
     self.cellClass = [PopupMenuToolsCell class];
     _enabled = YES;
   }
   return self;
 }

 - (void)configureCell:(PopupMenuToolsCell*)cell
            withStyler:(ChromeTableViewStyler*)styler {
   [super configureCell:cell withStyler:styler];
   cell.titleLabel.text = self.title;
   cell.imageView.image = self.image;
   cell.accessibilityTraits = UIAccessibilityTraitButton;
   cell.userInteractionEnabled = self.enabled;
   cell.destructiveAction = self.destructiveAction;
   [cell setBadgeNumber:self.badgeNumber];
   [cell setBadgeText:self.badgeText];
 }

 #pragma mark - PopupMenuItem

 - (CGSize)cellSizeForWidth:(CGFloat)width {
   // TODO(crbug.com/828357): This should be done at the table view level.
   static PopupMenuToolsCell* cell;
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
     cell = [[PopupMenuToolsCell alloc] init];
     [cell registerForContentSizeUpdates];
   });

   [self configureCell:cell withStyler:[[ChromeTableViewStyler alloc] init]];
   cell.frame = CGRectMake(0, 0, width, kMaxHeight);
   [cell setNeedsLayout];
   [cell layoutIfNeeded];
   return [cell systemLayoutSizeFittingSize:CGSizeMake(width, kMaxHeight)];
 }

 @end

 #pragma mark - PopupMenuToolsCell

 @interface PopupMenuToolsCell ()

 // Title label for the cell, redefined as readwrite.
 @property(nonatomic, strong, readwrite) UILabel* titleLabel;
 // Image view for the cell, redefined as readwrite.
 @property(nonatomic, strong, readwrite) UIImageView* imageView;
 // Badge displaying a number.
 @property(nonatomic, strong) NumberBadgeView* numberBadgeView;
 // Badge displaying text.
 @property(nonatomic, strong) TextBadgeView* textBadgeView;
 // Constraints between the trailing of the label and the badges.
 @property(nonatomic, strong) NSLayoutConstraint* titleToBadgeConstraint;
 // Color for the title and the image.
 @property(nonatomic, strong, readonly) UIColor* contentColor;

 @end

 @implementation PopupMenuToolsCell

 @synthesize imageView = _imageView;
 @synthesize numberBadgeView = _numberBadgeView;
 @synthesize textBadgeView = _textBadgeView;
 @synthesize titleLabel = _titleLabel;
 @synthesize titleToBadgeConstraint = _titleToBadgeConstraint;
 @synthesize destructiveAction = _destructiveAction;

 - (instancetype)initWithStyle:(UITableViewCellStyle)style
               reuseIdentifier:(NSString*)reuseIdentifier {
   self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
   if (self) {
     UIView* selectedBackgroundView = [[UIView alloc] init];
     selectedBackgroundView.backgroundColor =
         [UIColor colorWithWhite:0 alpha:kSelectedItemBackgroundAlpha];
     self.selectedBackgroundView = selectedBackgroundView;

     _titleLabel = [[UILabel alloc] init];
     _titleLabel.numberOfLines = 0;
     _titleLabel.font = [self titleFont];
     [_titleLabel
         setContentCompressionResistancePriority:UILayoutPriorityDefaultLow
                                         forAxis:
                                             UILayoutConstraintAxisHorizontal];
     [_titleLabel setContentHuggingPriority:UILayoutPriorityDefaultLow - 1
                                    forAxis:UILayoutConstraintAxisHorizontal];
     // The compression resistance has to be higher priority than the minimal
     // height constraint so it can increase the height of the cell to be
     // displayed on multiple lines.
     [_titleLabel
         setContentCompressionResistancePriority:UILayoutPriorityDefaultHigh
                                         forAxis:UILayoutConstraintAxisVertical];
     _titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
     _titleLabel.adjustsFontForContentSizeCategory = YES;

     _imageView = [[UIImageView alloc] init];
     _imageView.translatesAutoresizingMaskIntoConstraints = NO;

     _numberBadgeView = [[NumberBadgeView alloc] init];
     _numberBadgeView.translatesAutoresizingMaskIntoConstraints = NO;

     _textBadgeView = [[TextBadgeView alloc] initWithText:nil];
     _textBadgeView.translatesAutoresizingMaskIntoConstraints = NO;
     _textBadgeView.accessibilityIdentifier =
         kToolsMenuTextBadgeAccessibilityIdentifier;
     _textBadgeView.hidden = YES;

     [self.contentView addSubview:_titleLabel];
     [self.contentView addSubview:_imageView];
     [self.contentView addSubview:_numberBadgeView];
     [self.contentView addSubview:_textBadgeView];

     [NSLayoutConstraint activateConstraints:@[
       [_titleLabel.centerYAnchor
           constraintEqualToAnchor:self.contentView.centerYAnchor],
       // Align the center of image with the center of the capital letter of the
       // first line of the title.
       [_imageView.centerYAnchor
           constraintEqualToAnchor:_titleLabel.firstBaselineAnchor
                          constant:-[self titleFont].capHeight / 2.0],
       [_numberBadgeView.centerYAnchor
           constraintEqualToAnchor:_imageView.centerYAnchor],
       [_textBadgeView.centerYAnchor
           constraintEqualToAnchor:_imageView.centerYAnchor],
       [self.contentView.heightAnchor
           constraintGreaterThanOrEqualToConstant:kCellHeight],
     ]];
     ApplyVisualConstraintsWithMetrics(
         @[
           @"H:|-(margin)-[image(imageLength)]-(innerMargin)-[label]",
           @"H:[numberBadge]-(margin)-|", @"H:[textBadge]-(margin)-|",
           @"V:|-(>=topMargin)-[label]-(>=topMargin)-|"
         ],
         @{
           @"image" : _imageView,
           @"label" : _titleLabel,
           @"numberBadge" : _numberBadgeView,
           @"textBadge" : _textBadgeView
         },
         @{
           @"margin" : @(kMargin),
           @"innerMargin" : @(kInnerMargin),
           @"topMargin" : @(kTopMargin),
           @"imageLength" : @(kImageLength),
         });

     // The height constraint is used to have something as small as possible when
     // calculating the size of the prototype cell.
     NSLayoutConstraint* heightConstraint =
         [self.contentView.heightAnchor constraintEqualToConstant:kCellHeight];
     heightConstraint.priority = UILayoutPriorityDefaultLow;

     NSLayoutConstraint* trailingEdge = [_titleLabel.trailingAnchor
         constraintEqualToAnchor:self.contentView.trailingAnchor
                        constant:-kMargin];
     trailingEdge.priority = UILayoutPriorityDefaultHigh - 2;
     [NSLayoutConstraint
         activateConstraints:@[ trailingEdge, heightConstraint ]];

     self.isAccessibilityElement = YES;
   }
   return self;
 }

 - (void)setBadgeNumber:(NSInteger)badgeNumber {
   BOOL wasHidden = self.numberBadgeView.hidden;
   [self.numberBadgeView setNumber:badgeNumber animated:NO];
   // If the number badge is shown, then the text badge must be hidden.
   if (!self.numberBadgeView.hidden && !self.textBadgeView.hidden) {
     [self setBadgeText:nil];
   }
   if (!self.numberBadgeView.hidden && wasHidden) {
     self.titleToBadgeConstraint.active = NO;
     self.titleToBadgeConstraint = [self.numberBadgeView.leadingAnchor
         constraintGreaterThanOrEqualToAnchor:self.titleLabel.trailingAnchor
                                     constant:kInnerMargin];
     self.titleToBadgeConstraint.active = YES;
   } else if (self.numberBadgeView.hidden && !wasHidden) {
     self.titleToBadgeConstraint.active = NO;
   }
 }

 - (void)setBadgeText:(NSString*)badgeText {
   // Only 1 badge can be visible at a time, and the number badge takes priority.
   if (badgeText && !self.numberBadgeView.isHidden) {
     return;
   }

   if (badgeText) {
     [self.textBadgeView setText:badgeText];
     if (self.textBadgeView.hidden) {
       self.textBadgeView.hidden = NO;
       self.titleToBadgeConstraint.active = NO;
       self.titleToBadgeConstraint = [self.textBadgeView.leadingAnchor
           constraintGreaterThanOrEqualToAnchor:self.titleLabel.trailingAnchor
                                       constant:kInnerMargin];
       self.titleToBadgeConstraint.active = YES;
       self.textBadgeView.alpha = 1;
     }
   } else if (!self.textBadgeView.hidden) {
     self.textBadgeView.hidden = YES;
     self.titleToBadgeConstraint.active = NO;
   }
 }

 - (void)setDestructiveAction:(BOOL)destructiveAction {
   _destructiveAction = destructiveAction;
   if (self.userInteractionEnabled) {
     self.titleLabel.textColor = self.contentColor;
     self.imageView.tintColor = self.contentColor;
   }
 }

 - (UIColor*)contentColor {
   if (self.destructiveAction)
     return UIColorFromRGB(kEnabledDestructiveColor);
   return UIColorFromRGB(kEnabledDefaultColor);
 }

 - (void)registerForContentSizeUpdates {
   // This is needed because if the cell is static (used for height),
   // adjustsFontForContentSizeCategory isn't working.
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(preferredContentSizeDidChange:)
              name:UIContentSizeCategoryDidChangeNotification
            object:nil];
 }

 #pragma mark - UIView

 - (void)layoutSubviews {
   [super layoutSubviews];

   // Adjust the text label preferredMaxLayoutWidth when the parent's width
   // changes, for instance on screen rotation.
   CGFloat parentWidth = CGRectGetWidth(self.contentView.bounds);

   CGFloat trailingMargin = kMargin;
   if (!self.numberBadgeView.hidden) {
     trailingMargin += self.numberBadgeView.bounds.size.width + kInnerMargin;
   } else if (!self.textBadgeView.hidden) {
     trailingMargin += self.textBadgeView.bounds.size.width + kInnerMargin;
   }
   CGFloat leadingMargin = kMargin + kImageLength + kInnerMargin;

   self.titleLabel.preferredMaxLayoutWidth =
       parentWidth - leadingMargin - trailingMargin;

   // Re-layout with the new preferred width to allow the label to adjust its
   // height.
   [super layoutSubviews];
 }

 #pragma mark - UITableViewCell

 - (void)prepareForReuse {
   [super prepareForReuse];
   self.userInteractionEnabled = YES;
   self.accessibilityTraits &= ~UIAccessibilityTraitNotEnabled;
 }

 - (void)setUserInteractionEnabled:(BOOL)userInteractionEnabled {
   [super setUserInteractionEnabled:userInteractionEnabled];
   if (userInteractionEnabled) {
     self.titleLabel.textColor = self.contentColor;
     self.imageView.tintColor = self.contentColor;
   } else {
     self.titleLabel.textColor = [[self class] disabledColor];
     self.imageView.tintColor = [[self class] disabledColor];
     self.accessibilityTraits |= UIAccessibilityTraitNotEnabled;
   }
 }

 #pragma mark - Private

 // Callback when the preferred Content Size change.
 - (void)preferredContentSizeDidChange:(NSNotification*)notification {
   self.titleLabel.font = [self titleFont];
 }

 // Font to be used for the title.
 - (UIFont*)titleFont {
   return [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
 }

 // Returns the color of the disabled button's title.
 + (UIColor*)disabledColor {
   static UIColor* systemTintColorForDisabled = nil;
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
     UIButton* button = [UIButton buttonWithType:UIButtonTypeSystem];
     systemTintColorForDisabled =
         [button titleColorForState:UIControlStateDisabled];
   });
   return systemTintColorForDisabled;
 }

 @end
	// Copyright 2018 The Chromium Authors. All rights reserved.
	// 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/popup_menu/cells/popup_menu_tools_item.h"

	#include <stdlib.h>

	#include "base/logging.h"
	#import "ios/chrome/browser/ui/popup_menu/public/popup_menu_ui_constants.h"
	#import "ios/chrome/browser/ui/reading_list/number_badge_view.h"
	#import "ios/chrome/browser/ui/reading_list/text_badge_view.h"
	#import "ios/chrome/browser/ui/table_view/chrome_table_view_styler.h"
	#import "ios/chrome/browser/ui/util/uikit_ui_util.h"
	#import "ios/chrome/common/material_timing.h"
	#import "ios/chrome/common/ui_util/constraints_ui_util.h"

	#if !defined(__has_feature) \|\| !__has_feature(objc_arc)
	#error "This file requires ARC support."
	#endif

	namespace {
	const int kEnabledDefaultColor = 0x1A73E8;
	const int kEnabledDestructiveColor = 0xEA4334;
	const CGFloat kImageLength = 28;
	const CGFloat kCellHeight = 44;
	const CGFloat kInnerMargin = 11;
	const CGFloat kMargin = 15;
	const CGFloat kTopMargin = 8;
	const CGFloat kMaxHeight = 100;
	NSString* const kToolsMenuTextBadgeAccessibilityIdentifier =
	@"kToolsMenuTextBadgeAccessibilityIdentifier";
	} // namespace

	@implementation PopupMenuToolsItem

	@synthesize actionIdentifier = _actionIdentifier;
	@synthesize badgeNumber = _badgeNumber;
	@synthesize badgeText = _badgeText;
	@synthesize image = _image;
	@synthesize title = _title;
	@synthesize enabled = _enabled;
	@synthesize destructiveAction = _destructiveAction;

	- (instancetype)initWithType:(NSInteger)type {
	self = [super initWithType:type];
	if (self) {
	self.cellClass = [PopupMenuToolsCell class];
	_enabled = YES;
	}
	return self;
	}

	- (void)configureCell:(PopupMenuToolsCell*)cell
	withStyler:(ChromeTableViewStyler*)styler {
	[super configureCell:cell withStyler:styler];
	cell.titleLabel.text = self.title;
	cell.imageView.image = self.image;
	cell.accessibilityTraits = UIAccessibilityTraitButton;
	cell.userInteractionEnabled = self.enabled;
	cell.destructiveAction = self.destructiveAction;
	[cell setBadgeNumber:self.badgeNumber];
	[cell setBadgeText:self.badgeText];
	}

	#pragma mark - PopupMenuItem

	- (CGSize)cellSizeForWidth:(CGFloat)width {
	// TODO(crbug.com/828357): This should be done at the table view level.
	static PopupMenuToolsCell* cell;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
	cell = [[PopupMenuToolsCell alloc] init];
	[cell registerForContentSizeUpdates];
	});

	[self configureCell:cell withStyler:[[ChromeTableViewStyler alloc] init]];
	cell.frame = CGRectMake(0, 0, width, kMaxHeight);
	[cell setNeedsLayout];
	[cell layoutIfNeeded];
	return [cell systemLayoutSizeFittingSize:CGSizeMake(width, kMaxHeight)];
	}

	@end

	#pragma mark - PopupMenuToolsCell

	@interface PopupMenuToolsCell ()

	// Title label for the cell, redefined as readwrite.
	@property(nonatomic, strong, readwrite) UILabel* titleLabel;
	// Image view for the cell, redefined as readwrite.
	@property(nonatomic, strong, readwrite) UIImageView* imageView;
	// Badge displaying a number.
	@property(nonatomic, strong) NumberBadgeView* numberBadgeView;
	// Badge displaying text.
	@property(nonatomic, strong) TextBadgeView* textBadgeView;
	// Constraints between the trailing of the label and the badges.
	@property(nonatomic, strong) NSLayoutConstraint* titleToBadgeConstraint;
	// Color for the title and the image.
	@property(nonatomic, strong, readonly) UIColor* contentColor;

	@end

	@implementation PopupMenuToolsCell

	@synthesize imageView = _imageView;
	@synthesize numberBadgeView = _numberBadgeView;
	@synthesize textBadgeView = _textBadgeView;
	@synthesize titleLabel = _titleLabel;
	@synthesize titleToBadgeConstraint = _titleToBadgeConstraint;
	@synthesize destructiveAction = _destructiveAction;

	- (instancetype)initWithStyle:(UITableViewCellStyle)style
	reuseIdentifier:(NSString*)reuseIdentifier {
	self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
	if (self) {
	UIView* selectedBackgroundView = [[UIView alloc] init];
	selectedBackgroundView.backgroundColor =
	[UIColor colorWithWhite:0 alpha:kSelectedItemBackgroundAlpha];
	self.selectedBackgroundView = selectedBackgroundView;

	_titleLabel = [[UILabel alloc] init];
	_titleLabel.numberOfLines = 0;
	_titleLabel.font = [self titleFont];
	[_titleLabel
	setContentCompressionResistancePriority:UILayoutPriorityDefaultLow
	forAxis:
	UILayoutConstraintAxisHorizontal];
	[_titleLabel setContentHuggingPriority:UILayoutPriorityDefaultLow - 1
	forAxis:UILayoutConstraintAxisHorizontal];
	// The compression resistance has to be higher priority than the minimal
	// height constraint so it can increase the height of the cell to be
	// displayed on multiple lines.
	[_titleLabel
	setContentCompressionResistancePriority:UILayoutPriorityDefaultHigh
	forAxis:UILayoutConstraintAxisVertical];
	_titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
	_titleLabel.adjustsFontForContentSizeCategory = YES;

	_imageView = [[UIImageView alloc] init];
	_imageView.translatesAutoresizingMaskIntoConstraints = NO;

	_numberBadgeView = [[NumberBadgeView alloc] init];
	_numberBadgeView.translatesAutoresizingMaskIntoConstraints = NO;

	_textBadgeView = [[TextBadgeView alloc] initWithText:nil];
	_textBadgeView.translatesAutoresizingMaskIntoConstraints = NO;
	_textBadgeView.accessibilityIdentifier =
	kToolsMenuTextBadgeAccessibilityIdentifier;
	_textBadgeView.hidden = YES;

	[self.contentView addSubview:_titleLabel];
	[self.contentView addSubview:_imageView];
	[self.contentView addSubview:_numberBadgeView];
	[self.contentView addSubview:_textBadgeView];

	[NSLayoutConstraint activateConstraints:@[
	[_titleLabel.centerYAnchor
	constraintEqualToAnchor:self.contentView.centerYAnchor],
	// Align the center of image with the center of the capital letter of the
	// first line of the title.
	[_imageView.centerYAnchor
	constraintEqualToAnchor:_titleLabel.firstBaselineAnchor
	constant:-[self titleFont].capHeight / 2.0],
	[_numberBadgeView.centerYAnchor
	constraintEqualToAnchor:_imageView.centerYAnchor],
	[_textBadgeView.centerYAnchor
	constraintEqualToAnchor:_imageView.centerYAnchor],
	[self.contentView.heightAnchor
	constraintGreaterThanOrEqualToConstant:kCellHeight],
	]];
	ApplyVisualConstraintsWithMetrics(
	@[
	@"H:\|-(margin)-[image(imageLength)]-(innerMargin)-[label]",
	@"H:[numberBadge]-(margin)-\|", @"H:[textBadge]-(margin)-\|",
	@"V:\|-(>=topMargin)-[label]-(>=topMargin)-\|"
	],
	@{
	@"image" : _imageView,
	@"label" : _titleLabel,
	@"numberBadge" : _numberBadgeView,
	@"textBadge" : _textBadgeView
	},
	@{
	@"margin" : @(kMargin),
	@"innerMargin" : @(kInnerMargin),
	@"topMargin" : @(kTopMargin),
	@"imageLength" : @(kImageLength),
	});

	// The height constraint is used to have something as small as possible when
	// calculating the size of the prototype cell.
	NSLayoutConstraint* heightConstraint =
	[self.contentView.heightAnchor constraintEqualToConstant:kCellHeight];
	heightConstraint.priority = UILayoutPriorityDefaultLow;

	NSLayoutConstraint* trailingEdge = [_titleLabel.trailingAnchor
	constraintEqualToAnchor:self.contentView.trailingAnchor
	constant:-kMargin];
	trailingEdge.priority = UILayoutPriorityDefaultHigh - 2;
	[NSLayoutConstraint
	activateConstraints:@[ trailingEdge, heightConstraint ]];

	self.isAccessibilityElement = YES;
	}
	return self;
	}

	- (void)setBadgeNumber:(NSInteger)badgeNumber {
	BOOL wasHidden = self.numberBadgeView.hidden;
	[self.numberBadgeView setNumber:badgeNumber animated:NO];
	// If the number badge is shown, then the text badge must be hidden.
	if (!self.numberBadgeView.hidden && !self.textBadgeView.hidden) {
	[self setBadgeText:nil];
	}
	if (!self.numberBadgeView.hidden && wasHidden) {
	self.titleToBadgeConstraint.active = NO;
	self.titleToBadgeConstraint = [self.numberBadgeView.leadingAnchor
	constraintGreaterThanOrEqualToAnchor:self.titleLabel.trailingAnchor
	constant:kInnerMargin];
	self.titleToBadgeConstraint.active = YES;
	} else if (self.numberBadgeView.hidden && !wasHidden) {
	self.titleToBadgeConstraint.active = NO;
	}
	}

	- (void)setBadgeText:(NSString*)badgeText {
	// Only 1 badge can be visible at a time, and the number badge takes priority.
	if (badgeText && !self.numberBadgeView.isHidden) {
	return;
	}

	if (badgeText) {
	[self.textBadgeView setText:badgeText];
	if (self.textBadgeView.hidden) {
	self.textBadgeView.hidden = NO;
	self.titleToBadgeConstraint.active = NO;
	self.titleToBadgeConstraint = [self.textBadgeView.leadingAnchor
	constraintGreaterThanOrEqualToAnchor:self.titleLabel.trailingAnchor
	constant:kInnerMargin];
	self.titleToBadgeConstraint.active = YES;
	self.textBadgeView.alpha = 1;
	}
	} else if (!self.textBadgeView.hidden) {
	self.textBadgeView.hidden = YES;
	self.titleToBadgeConstraint.active = NO;
	}
	}

	- (void)setDestructiveAction:(BOOL)destructiveAction {
	_destructiveAction = destructiveAction;
	if (self.userInteractionEnabled) {
	self.titleLabel.textColor = self.contentColor;
	self.imageView.tintColor = self.contentColor;
	}
	}

	- (UIColor*)contentColor {
	if (self.destructiveAction)
	return UIColorFromRGB(kEnabledDestructiveColor);
	return UIColorFromRGB(kEnabledDefaultColor);
	}

	- (void)registerForContentSizeUpdates {
	// This is needed because if the cell is static (used for height),
	// adjustsFontForContentSizeCategory isn't working.
	[[NSNotificationCenter defaultCenter]
	addObserver:self
	selector:@selector(preferredContentSizeDidChange:)
	name:UIContentSizeCategoryDidChangeNotification
	object:nil];
	}

	#pragma mark - UIView

	- (void)layoutSubviews {
	[super layoutSubviews];

	// Adjust the text label preferredMaxLayoutWidth when the parent's width
	// changes, for instance on screen rotation.
	CGFloat parentWidth = CGRectGetWidth(self.contentView.bounds);

	CGFloat trailingMargin = kMargin;
	if (!self.numberBadgeView.hidden) {
	trailingMargin += self.numberBadgeView.bounds.size.width + kInnerMargin;
	} else if (!self.textBadgeView.hidden) {
	trailingMargin += self.textBadgeView.bounds.size.width + kInnerMargin;
	}
	CGFloat leadingMargin = kMargin + kImageLength + kInnerMargin;

	self.titleLabel.preferredMaxLayoutWidth =
	parentWidth - leadingMargin - trailingMargin;

	// Re-layout with the new preferred width to allow the label to adjust its
	// height.
	[super layoutSubviews];
	}

	#pragma mark - UITableViewCell

	- (void)prepareForReuse {
	[super prepareForReuse];
	self.userInteractionEnabled = YES;
	self.accessibilityTraits &= ~UIAccessibilityTraitNotEnabled;
	}

	- (void)setUserInteractionEnabled:(BOOL)userInteractionEnabled {
	[super setUserInteractionEnabled:userInteractionEnabled];
	if (userInteractionEnabled) {
	self.titleLabel.textColor = self.contentColor;
	self.imageView.tintColor = self.contentColor;
	} else {
	self.titleLabel.textColor = [[self class] disabledColor];
	self.imageView.tintColor = [[self class] disabledColor];
	self.accessibilityTraits \|= UIAccessibilityTraitNotEnabled;
	}
	}

	#pragma mark - Private

	// Callback when the preferred Content Size change.
	- (void)preferredContentSizeDidChange:(NSNotification*)notification {
	self.titleLabel.font = [self titleFont];
	}

	// Font to be used for the title.
	- (UIFont*)titleFont {
	return [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
	}

	// Returns the color of the disabled button's title.
	+ (UIColor*)disabledColor {
	static UIColor* systemTintColorForDisabled = nil;
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
	UIButton* button = [UIButton buttonWithType:UIButtonTypeSystem];
	systemTintColorForDisabled =
	[button titleColorForState:UIControlStateDisabled];
	});
	return systemTintColorForDisabled;
	}

	@end