Suggestions UI - expandable item

ios/chrome/browser/ui/suggestions/suggestions_expandable_item.h

+// 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_EXPANDABLE_ITEM_H_
+#define IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_EXPANDABLE_ITEM_H_
+
+#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
+
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
+
+@class SuggestionsExpandableCell;
+
+@protocol SuggestionsExpandableCellAudience
+
+- (void)expandCell:(UICollectionViewCell*)cell;
+- (void)retractCell:(UICollectionViewCell*)cell;
+
+@end
+
+// Item for an expandable article in the suggestions. An expandable article can
+// be expanded, displaying more informations/interactions.
+@interface SuggestionsExpandableItem : CollectionViewItem
+
+// Init the article with a |title|, a |subtitle| an |image| and some |detail|
+// displayed only when the article is expanded. |type| is the type of the item.
+- (instancetype)initWithType:(NSInteger)type
+                       title:(NSString*)title
+                    subtitle:(NSString*)subtitle
+                       image:(UIImage*)image
+                  detailText:(NSString*)detail NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithType:(NSInteger)type NS_UNAVAILABLE;
+
+@property(nonatomic, weak) id<SuggestionsExpandableCellAudience> audience;
+
+- (void)expand:(SuggestionsExpandableCell*)cell;

[lpromero, 2017/01/13 17:35:48]

A isExpanded property needs to appear in the interface. Then you can remove
these and in the collection view controller, you do:

item.expanded = YES;
[self reconfigureCellsForItems:@[ item ]];

This will call in turn the expand/retract methods on the cell.

[gambard, 2017/01/16 09:50:39]

Done.

+- (void)retract:(SuggestionsExpandableCell*)cell;
+
+@end
+
+// Corresponding cell of an expandable article.
+@interface SuggestionsExpandableCell : MDCCollectionViewCell
+
+@property(nonatomic, weak) id<SuggestionsExpandableCellAudience> audience;
+@property(nonatomic, readonly, strong) UILabel* titleLabel;
+@property(nonatomic, readonly, strong) UILabel* subtitleLabel;
+@property(nonatomic, readonly, strong) UILabel* detailLabel;
+@property(nonatomic, strong) UIImageView* imageView;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_EXPANDABLE_ITEM_H_