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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #import "ios/chrome/browser/ui/content_suggestions/content_suggestions_article_i
tem.h" | |
6 | |
7 #include "base/time/time.h" | |
8 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h" | |
9 #import "ios/chrome/browser/ui/uikit_ui_util.h" | |
10 #import "ios/chrome/browser/ui/util/i18n_string.h" | |
11 #import "ios/third_party/material_components_ios/src/components/Typography/src/M
aterialTypography.h" | |
12 #include "url/gurl.h" | |
13 | |
14 #if !defined(__has_feature) || !__has_feature(objc_arc) | |
15 #error "This file requires ARC support." | |
16 #endif | |
17 | |
18 namespace { | |
19 const CGFloat kImageSize = 72; | |
20 // When updating this, make sure to update |layoutSubviews|. | |
21 const CGFloat kStandardSpacing = 8; | |
22 } | |
23 | |
24 @interface ContentSuggestionsArticleItem () | |
25 | |
26 @property(nonatomic, copy) NSString* subtitle; | |
27 // Used to check if the image has already been fetched. There is no way to | |
28 // discriminate between failed image download and nonexitent image. The article | |
29 // tries to download the image only once. | |
30 @property(nonatomic, assign) BOOL imageFetched; | |
31 | |
32 @end | |
33 | |
34 #pragma mark - ContentSuggestionsArticleItem | |
35 | |
36 @implementation ContentSuggestionsArticleItem | |
37 | |
38 @synthesize title = _title; | |
39 @synthesize subtitle = _subtitle; | |
40 @synthesize image = _image; | |
41 @synthesize articleURL = _articleURL; | |
42 @synthesize publisher = _publisher; | |
43 @synthesize publishDate = _publishDate; | |
44 @synthesize suggestionIdentifier = _suggestionIdentifier; | |
45 @synthesize delegate = _delegate; | |
46 @synthesize imageFetched = _imageFetched; | |
47 | |
48 - (instancetype)initWithType:(NSInteger)type | |
49 title:(NSString*)title | |
50 subtitle:(NSString*)subtitle | |
51 delegate:(id<ContentSuggestionsArticleItemDelegate>)delegate | |
52 url:(const GURL&)url { | |
53 self = [super initWithType:type]; | |
54 if (self) { | |
55 self.cellClass = [ContentSuggestionsArticleCell class]; | |
56 _title = [title copy]; | |
57 _subtitle = [subtitle copy]; | |
58 _articleURL = url; | |
59 _delegate = delegate; | |
60 _image = [self emptyImageBackground]; | |
61 } | |
62 return self; | |
63 } | |
64 | |
65 - (void)configureCell:(ContentSuggestionsArticleCell*)cell { | |
66 [super configureCell:cell]; | |
67 if (!self.imageFetched) { | |
68 self.imageFetched = YES; | |
69 // Fetch the image. During the fetch the cell's image should still be set. | |
70 [self.delegate loadImageForArticleItem:self]; | |
71 } | |
72 cell.titleLabel.text = self.title; | |
73 cell.subtitleLabel.text = self.subtitle; | |
74 cell.imageView.image = self.image; | |
75 [cell setPublisherName:self.publisher date:self.publishDate]; | |
76 } | |
77 | |
78 #pragma mark - Private | |
79 | |
80 - (UIImage*)emptyImageBackground { | |
81 // TODO(crbug.com/698171): Remove this function once we have real background | |
82 // image. | |
83 UIColor* color = [UIColor lightGrayColor]; | |
84 CGRect rect = CGRectMake(0, 0, 1, 1); | |
85 UIGraphicsBeginImageContext(rect.size); | |
86 [color setFill]; | |
87 UIRectFill(rect); | |
88 UIImage* image = UIGraphicsGetImageFromCurrentImageContext(); | |
89 UIGraphicsEndImageContext(); | |
90 return image; | |
91 } | |
92 | |
93 @end | |
94 | |
95 #pragma mark - ContentSuggestionsArticleCell | |
96 | |
97 @interface ContentSuggestionsArticleCell () | |
98 | |
99 @property(nonatomic, strong) UILabel* publisherLabel; | |
100 | |
101 // Applies the constraints on the elements. Called in the init. | |
102 - (void)applyConstraints; | |
103 | |
104 @end | |
105 | |
106 @implementation ContentSuggestionsArticleCell | |
107 | |
108 @synthesize titleLabel = _titleLabel; | |
109 @synthesize subtitleLabel = _subtitleLabel; | |
110 @synthesize imageView = _imageView; | |
111 @synthesize publisherLabel = _publisherLabel; | |
112 | |
113 - (instancetype)initWithFrame:(CGRect)frame { | |
114 self = [super initWithFrame:frame]; | |
115 if (self) { | |
116 _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero]; | |
117 _subtitleLabel = [[UILabel alloc] initWithFrame:CGRectZero]; | |
118 _imageView = [[UIImageView alloc] initWithFrame:CGRectZero]; | |
119 _publisherLabel = [[UILabel alloc] initWithFrame:CGRectZero]; | |
120 | |
121 _titleLabel.numberOfLines = 2; | |
122 _subtitleLabel.numberOfLines = 0; | |
123 [_subtitleLabel setContentHuggingPriority:UILayoutPriorityDefaultHigh | |
124 forAxis:UILayoutConstraintAxisVertical]; | |
125 [_titleLabel setContentHuggingPriority:UILayoutPriorityDefaultHigh | |
126 forAxis:UILayoutConstraintAxisVertical]; | |
127 _imageView.contentMode = UIViewContentModeScaleAspectFill; | |
128 _imageView.clipsToBounds = YES; | |
129 | |
130 _imageView.translatesAutoresizingMaskIntoConstraints = NO; | |
131 _titleLabel.translatesAutoresizingMaskIntoConstraints = NO; | |
132 _subtitleLabel.translatesAutoresizingMaskIntoConstraints = NO; | |
133 _publisherLabel.translatesAutoresizingMaskIntoConstraints = NO; | |
134 | |
135 [self.contentView addSubview:_imageView]; | |
136 [self.contentView addSubview:_titleLabel]; | |
137 [self.contentView addSubview:_subtitleLabel]; | |
138 [self.contentView addSubview:_publisherLabel]; | |
139 | |
140 _titleLabel.font = [MDCTypography subheadFont]; | |
141 _subtitleLabel.font = [MDCTypography body1Font]; | |
142 _publisherLabel.font = [MDCTypography captionFont]; | |
143 | |
144 _subtitleLabel.textColor = [[MDCPalette greyPalette] tint700]; | |
145 _publisherLabel.textColor = [[MDCPalette greyPalette] tint700]; | |
146 | |
147 [self applyConstraints]; | |
148 } | |
149 return self; | |
150 } | |
151 | |
152 - (void)setPublisherName:(NSString*)publisherName date:(base::Time)publishDate { | |
153 NSDate* date = [NSDate dateWithTimeIntervalSince1970:publishDate.ToDoubleT()]; | |
154 NSString* dateString = | |
155 [NSDateFormatter localizedStringFromDate:date | |
156 dateStyle:NSDateFormatterMediumStyle | |
157 timeStyle:NSDateFormatterNoStyle]; | |
158 | |
159 self.publisherLabel.text = AdjustStringForLocaleDirection( | |
160 [NSString stringWithFormat:@"%@ - %@.", publisherName, dateString]); | |
161 } | |
162 | |
163 #pragma mark - UIView | |
164 | |
165 // Implements -layoutSubviews as per instructions in documentation for | |
166 // +[MDCCollectionViewCell cr_preferredHeightForWidth:forItem:]. | |
167 - (void)layoutSubviews { | |
168 [super layoutSubviews]; | |
169 | |
170 // Adjust the text label preferredMaxLayoutWidth when the parent's width | |
171 // changes, for instance on screen rotation. | |
172 CGFloat parentWidth = CGRectGetWidth(self.contentView.bounds); | |
173 | |
174 self.titleLabel.preferredMaxLayoutWidth = | |
175 parentWidth - kImageSize - 3 * kStandardSpacing; | |
176 self.subtitleLabel.preferredMaxLayoutWidth = | |
177 parentWidth - kImageSize - 3 * kStandardSpacing; | |
178 | |
179 // Re-layout with the new preferred width to allow the label to adjust its | |
180 // height. | |
181 [super layoutSubviews]; | |
182 } | |
183 | |
184 #pragma mark - Private | |
185 | |
186 - (void)applyConstraints { | |
187 [NSLayoutConstraint activateConstraints:@[ | |
188 [_imageView.widthAnchor constraintEqualToConstant:kImageSize], | |
189 [_imageView.heightAnchor constraintEqualToAnchor:_imageView.widthAnchor], | |
190 [_publisherLabel.topAnchor | |
191 constraintGreaterThanOrEqualToAnchor:_imageView.bottomAnchor | |
192 constant:kStandardSpacing], | |
193 [_publisherLabel.topAnchor | |
194 constraintGreaterThanOrEqualToAnchor:_subtitleLabel.bottomAnchor | |
195 constant:kStandardSpacing], | |
196 ]]; | |
197 | |
198 ApplyVisualConstraintsWithMetrics( | |
199 @[ | |
200 @"H:|-(space)-[title]-(space)-[image]-(space)-|", | |
201 @"H:|-(space)-[text]-(space)-[image]", | |
202 @"V:|-[title]-[text]", | |
203 @"V:|-[image]", | |
204 @"H:|-[publish]-|", | |
205 @"V:[publish]-|", | |
206 ], | |
207 @{ | |
208 @"image" : _imageView, | |
209 @"title" : _titleLabel, | |
210 @"text" : _subtitleLabel, | |
211 @"publish" : _publisherLabel, | |
212 }, | |
213 @{ @"space" : @(kStandardSpacing) }); | |
214 } | |
215 | |
216 @end | |
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