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

ios/chrome/browser/ui/settings/cells/card_multiline_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/card_multiline_item.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;
+}  // namespace
+
+@implementation CardMultilineItem
+
+@synthesize text = _text;
+
+- (instancetype)initWithType:(NSInteger)type {
+  self = [super initWithType:type];
+  if (self) {
+    self.cellClass = [CardMultilineCell class];
+  }
+  return self;
+}
+
+#pragma mark CollectionViewItem
+
+- (void)configureCell:(CardMultilineCell*)cell {
+  [super configureCell:cell];
+  cell.textLabel.text = self.text;
+}
+
+@end
+
+@implementation CardMultilineCell
+
+@synthesize textLabel = _textLabel;
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    UIView* contentView = self.contentView;
+
+    _textLabel = [[UILabel alloc] init];
+    _textLabel.translatesAutoresizingMaskIntoConstraints = NO;
+    [contentView addSubview:_textLabel];
+
+    _textLabel.font =
+        [[MDFRobotoFontLoader sharedInstance] regularFontOfSize:14];
+    _textLabel.textColor = [[MDCPalette greyPalette] tint900];
+    _textLabel.numberOfLines = 0;
+
+    // Set up the constraints.
+    [NSLayoutConstraint activateConstraints:@[
+      [_textLabel.leadingAnchor
+          constraintEqualToAnchor:contentView.leadingAnchor
+                         constant:kHorizontalPadding],
+      [_textLabel.trailingAnchor
+          constraintEqualToAnchor:contentView.trailingAnchor
+                         constant:-kHorizontalPadding],
+      [_textLabel.topAnchor constraintEqualToAnchor:contentView.topAnchor
+                                           constant:kVerticalPadding],
+      [_textLabel.bottomAnchor constraintEqualToAnchor:contentView.bottomAnchor
+                                              constant:-kVerticalPadding],
+    ]];
+  }
+  return self;
+}
+
+// Implements -layoutSubviews as per instructions in documentation for
+// +[MDCCollectionViewCell cr_preferredHeightForWidth:forItem:].
+- (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);
+  self.textLabel.preferredMaxLayoutWidth = parentWidth - 2 * kHorizontalPadding;
+
+  // Re-layout with the new preferred width to allow the label to adjust its
+  // height.
+  [super layoutSubviews];
+}
+
+@end