Add CSDataSource in showcase

ios/showcase/content_suggestions/sc_content_suggestions_data_source.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/showcase/content_suggestions/sc_content_suggestions_data_source.h"
+
+#include "base/time/time.h"
+#include "components/strings/grit/components_strings.h"
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestion.h"
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestions_data_sink.h"
+#import "ios/chrome/browser/ui/content_suggestions/content_suggestions_image_fetcher.h"
+#import "ios/chrome/browser/ui/content_suggestions/identifier/content_suggestion_identifier.h"
+#import "ios/chrome/browser/ui/content_suggestions/identifier/content_suggestions_section_information.h"
+#include "ios/chrome/grit/ios_strings.h"
+#include "ui/base/l10n/l10n_util_mac.h"
+#include "ui/gfx/image/image.h"
+#include "url/gurl.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SCContentSuggestionsDataSource ()<ContentSuggestionsImageFetcher>
+
+@property(nonatomic, strong) ContentSuggestionsSectionInformation* sectionInfo;

[lpromero, 2017/03/24 12:10:17]

Comment.

[gambard, 2017/03/24 15:12:49]

Done.

+
+@end
+
+@implementation SCContentSuggestionsDataSource
+
+@synthesize dataSink = _dataSink;
+@synthesize sectionInfo = _sectionInfo;
+
+#pragma mark - ContentSuggestionsDataSource
+
+- (nonnull NSArray<ContentSuggestion*>*)allSuggestions {

[lpromero, 2017/03/24 12:10:17]

No need for nullability annotations in the impl file. Here and below.

[gambard, 2017/03/24 15:12:49]

Done.

+  ContentSuggestion* suggestion = [self createContentSuggestions];
+  suggestion.title = @"Title of the first suggestion";
+  suggestion.text =
+      @"Description of the first suggestion, can span on two lines if needed.";
+  suggestion.publisher = @"Publisher of the new";
+  suggestion.publishDate = base::Time::Now();
+  suggestion.url = GURL("http://url.of.the.first.suggestion");
+  return @[ suggestion ];
+}
+
+- (nonnull NSArray<ContentSuggestion*>*)suggestionsForSection:
+    (nonnull ContentSuggestionsSectionInformation*)sectionInfo {
+  ContentSuggestion* suggestion = [self createContentSuggestions];
+  suggestion.title = @"Title of the first suggestions";
+  suggestion.text =
+      @"Description of the first suggestion, can span on two lines if needed.";
+  suggestion.publisher = @"Publisher of the new";
+  suggestion.publishDate = base::Time::Now();
+  suggestion.url = GURL("http://url.of.the.first.suggestion");
+  return @[ suggestion ];
+}
+
+- (nullable id<ContentSuggestionsImageFetcher>)imageFetcher {
+  return self;
+}
+
+- (void)fetchMoreSuggestionsKnowing:
+            (nullable NSArray<ContentSuggestionIdentifier*>*)knownSuggestions
+                    fromSectionInfo:
+                        (nonnull ContentSuggestionsSectionInformation*)
+                            sectionInfo
+                           callback:(nullable MoreSuggestionsFetched)callback {
+}
+
+#pragma mark - ContentSuggestionsImageFetcher
+
+- (void)fetchImageForSuggestion:
+            (ContentSuggestionIdentifier*)suggestionIdentifier
+                       callback:(void (^)(const gfx::Image&))callback {
+  if (callback) {
+    callback(gfx::Image([UIImage imageNamed:@"reading_list_empty_state"]));
+  }
+}
+
+#pragma mark - Property
+
+- (ContentSuggestionsSectionInformation*)sectionInfo {
+  if (!_sectionInfo) {
+    _sectionInfo = [[ContentSuggestionsSectionInformation alloc]
+        initWithSectionID:ContentSuggestionsSectionArticles];
+    _sectionInfo.title =
+        l10n_util::GetNSString(IDS_NTP_ARTICLE_SUGGESTIONS_SECTION_HEADER);
+    _sectionInfo.footerTitle =
+        l10n_util::GetNSString(IDS_IOS_CONTENT_SUGGESTIONS_FOOTER_TITLE);
+  }
+  return _sectionInfo;
+}
+
+#pragma mark - Private
+
+- (ContentSuggestion*)createContentSuggestions {
+  ContentSuggestion* suggestion = [[ContentSuggestion alloc] init];
+  suggestion.type = ContentSuggestionTypeArticle;
+  suggestion.suggestionIdentifier = [[ContentSuggestionIdentifier alloc] init];
+  suggestion.suggestionIdentifier.sectionInfo = self.sectionInfo;
+  return suggestion;
+}
+
+@end