Suggestions UI - Add Article items

ios/chrome/browser/ui/suggestions/suggestions_article_item.mm

+// Copyright 2017 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/suggestions/suggestions_article_item.h"
+
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+const CGFloat kImageSize = 100;
+}
+
+@interface SuggestionsArticleItem ()
+
+@property(nonatomic, copy) NSString* title;
+@property(nonatomic, copy) NSString* subtitle;
+@property(nonatomic, strong) UIImage* image;
+
+@end
+
+@implementation SuggestionsArticleItem
+
+@synthesize title = _title;
+@synthesize subtitle = _subtitle;
+@synthesize image = _image;
+
+- (instancetype)initWithType:(NSInteger)type
+                       title:(NSString*)title
+                    subtitle:(NSString*)subtitle
+                       image:(UIImage*)image {
+  self = [super initWithType:type];
+  if (self) {
+    self.cellClass = [SuggestionsArticleCell class];
+    _title = [title copy];
+    _subtitle = [subtitle copy];
+    _image = image;
+  }
+  return self;
+}
+
+- (void)configureCell:(SuggestionsArticleCell*)cell {
+  [super configureCell:cell];
+  cell.titleLabel.text = _title;
+  cell.subtitleLabel.text = _subtitle;
+  cell.imageView.image = _image;
+}
+
+@end
+
+@implementation SuggestionsArticleCell
+
+@synthesize titleLabel = _titleLabel;
+@synthesize subtitleLabel = _subtitleLabel;
+@synthesize imageView = _imageView;
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
+    _subtitleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
+    _imageView = [[UIImageView alloc] initWithFrame:CGRectZero];
+    UIView* imageContainer = [[UIView alloc] initWithFrame:CGRectZero];
+
+    _subtitleLabel.numberOfLines = 0;
+
+    imageContainer.translatesAutoresizingMaskIntoConstraints = NO;
+    _imageView.translatesAutoresizingMaskIntoConstraints = NO;
+    _titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
+    _subtitleLabel.translatesAutoresizingMaskIntoConstraints = NO;
+
+    [imageContainer addSubview:_imageView];
+    [self.contentView addSubview:imageContainer];
+    [self.contentView addSubview:_titleLabel];
+    [self.contentView addSubview:_subtitleLabel];
+
+    ApplyVisualConstraintsWithMetrics(
+        @[
+          @"H:|-[title]-[imageContainer(imageSize)]-|",
+          @"H:|[image(imageSize)]", @"H:|-[text]-[imageContainer]",
+          @"V:|[image(imageSize)]", @"V:|-[title]-[text]-|",
+          @"V:|-[imageContainer(>=imageSize)]-|"
+        ],
+        @{
+          @"image" : _imageView,
+          @"imageContainer" : imageContainer,
+          @"title" : _titleLabel,
+          @"text" : _subtitleLabel
+        },
+        @{ @"imageSize" : @(kImageSize) });
+  }
+  return self;
+}
+
+#pragma mark - UIView
+
+// 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.subtitleLabel.preferredMaxLayoutWidth = parentWidth - kImageSize - 3 * 8;
+
+  // Re-layout with the new preferred width to allow the label to adjust its
+  // height.
+  [super layoutSubviews];
+}
+
+@end