Upstream Chrome on iOS source code [7/11].

ios/chrome/browser/ui/settings/cells/text_and_error_item.mm

+// Copyright 2016 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/settings/cells/text_and_error_item.h"
+
+#include "base/mac/foundation_util.h"
+#import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
+#import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+// Padding used on the leading and trailing edges of the cell.
+const CGFloat kHorizontalPadding = 16;
+
+// Padding used on the top and bottom edges of the cell.
+const CGFloat kVerticalPadding = 16;
+
+// Padding used between the image and text.
+const CGFloat kHorizontalPaddingBetweenImageAndText = 10;
+
+// Error icon fixed horizontal size.
+const CGFloat kHorizontalErrorIconFixedSize = 25;
+}  // namespace
+
+@implementation TextAndErrorItem
+
+@synthesize text = _text;
+@synthesize accessoryType = _accessoryType;
+@synthesize shouldDisplayError = _shouldDisplayError;
+@synthesize enabled = _enabled;
+
+- (instancetype)initWithType:(NSInteger)type {
+  self = [super initWithType:type];
+  if (self) {
+    self.cellClass = [TextAndErrorCell class];
+    self.accessibilityTraits |= UIAccessibilityTraitButton;
+    self.enabled = YES;
+  }
+  return self;
+}
+
+- (void)configureCell:(TextAndErrorCell*)cell {
+  [super configureCell:cell];
+  cell.textLabel.text = self.text;
+  cell.accessoryType = self.accessoryType;
+  cell.accessibilityLabel = self.text;
+  if (self.shouldDisplayError) {
+    cell.errorIcon.image = [UIImage imageNamed:@"settings_error"];
+  } else {
+    cell.errorIcon.image = nil;
+  }
+  UIImageView* accessoryImage =
+      base::mac::ObjCCastStrict<UIImageView>(cell.accessoryView);
+  accessoryImage.image = [accessoryImage.image
+      imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
+  if (self.isEnabled) {
+    cell.textLabel.textColor = [[MDCPalette greyPalette] tint900];
+    [cell setUserInteractionEnabled:YES];
+    [accessoryImage setTintColor:[[MDCPalette greyPalette] tint900]];
+  } else {
+    [accessoryImage setTintColor:[[[MDCPalette greyPalette] tint500]
+                                     colorWithAlphaComponent:0.5]];
+    cell.textLabel.textColor = [[MDCPalette greyPalette] tint500];
+    [cell setUserInteractionEnabled:NO];
+  }
+}
+
+@end
+
+@interface TextAndErrorCell () {
+  // Constraint used to set the errorIcon width depending on its existence.
+  NSLayoutConstraint* _errorIconWidthConstraint;
+}
+
+@end
+
+@implementation TextAndErrorCell
+
+@synthesize textLabel = _textLabel;
+@synthesize errorIcon = _errorIcon;
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    self.contentView.clipsToBounds = YES;
+    _textLabel = [[UILabel alloc] init];
+    _textLabel.translatesAutoresizingMaskIntoConstraints = NO;
+    _textLabel.font =
+        [[MDFRobotoFontLoader sharedInstance] mediumFontOfSize:14];
+    _textLabel.textColor = [[MDCPalette greyPalette] tint900];
+    _textLabel.numberOfLines = 0;
+    [self.contentView addSubview:_textLabel];
+    _errorIcon = [[UIImageView alloc] init];
+    _errorIcon.translatesAutoresizingMaskIntoConstraints = NO;
+    [self.contentView addSubview:_errorIcon];
+    [self setConstraints];
+  }
+  return self;
+}
+
+- (void)setConstraints {
+  UIView* contentView = self.contentView;
+
+  _errorIconWidthConstraint = [_errorIcon.widthAnchor
+      constraintEqualToConstant:kHorizontalErrorIconFixedSize];
+
+  [NSLayoutConstraint activateConstraints:@[
+    [_textLabel.leadingAnchor constraintEqualToAnchor:contentView.leadingAnchor
+                                             constant:kHorizontalPadding],
+    [_textLabel.trailingAnchor
+        constraintEqualToAnchor:_errorIcon.leadingAnchor
+                       constant:-kHorizontalPaddingBetweenImageAndText],
+    [_textLabel.topAnchor constraintEqualToAnchor:contentView.topAnchor
+                                         constant:kVerticalPadding],
+    [_textLabel.bottomAnchor constraintEqualToAnchor:contentView.bottomAnchor
+                                            constant:-kVerticalPadding],
+    [_errorIcon.trailingAnchor
+        constraintEqualToAnchor:contentView.trailingAnchor
+                       constant:-kHorizontalPadding],
+    [_errorIcon.centerYAnchor
+        constraintEqualToAnchor:contentView.centerYAnchor],
+    _errorIconWidthConstraint,
+  ]];
+}
+
+// Implement -layoutSubviews as per instructions in documentation for
+// +[MDCCollectionViewCell cr_preferredHeightForWidth:forItem:].
+- (void)layoutSubviews {
+  [super layoutSubviews];
+
+  // Adjust the text and detailText label preferredMaxLayoutWidth when the
+  // parent's width
+  // changes, for instance on screen rotation.
+  if (_errorIcon.image) {
+    _errorIconWidthConstraint.constant = kHorizontalErrorIconFixedSize;
+    _textLabel.preferredMaxLayoutWidth =
+        CGRectGetWidth(self.contentView.frame) -
+        CGRectGetWidth(_errorIcon.frame) - 2 * kHorizontalPadding -
+        kHorizontalPaddingBetweenImageAndText;
+  } else {
+    _errorIconWidthConstraint.constant = 0;
+    _textLabel.preferredMaxLayoutWidth =
+        CGRectGetWidth(self.contentView.frame) - 2 * kHorizontalPadding;
+  }
+
+  // Re-layout with the new preferred width to allow the label to adjust its
+  // height.
+  [super layoutSubviews];
+}
+
+- (void)prepareForReuse {
+  [super prepareForReuse];
+  self.textLabel.textColor = [[MDCPalette greyPalette] tint900];
+  [self setUserInteractionEnabled:YES];
+  UIImageView* accessoryImage =
+      base::mac::ObjCCastStrict<UIImageView>(self.accessoryView);
+  accessoryImage.image = [accessoryImage.image
+      imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
+  [accessoryImage setTintColor:[[MDCPalette greyPalette] tint900]];
+}
+
+@end