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/chrome/browser/ui/collection_view/cells/collection_view_item.h"
+#import "ios/chrome/browser/ui/suggestions/expandable_item.h"
+#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
+
+@class SuggestionsExpandableCell;
+
+// Delegate for the SuggestionsExpandableCell. The delegate will take care of
+// the expansion/collapsing of the cell.
+@protocol SuggestionsExpandableCellDelegate
+
+- (void)expandCell:(UICollectionViewCell*)cell;
+- (void)collapseCell:(UICollectionViewCell*)cell;
+
+@end
+
+// Item for an expandable article in the suggestions. An expandable article can
+// be expanded, displaying more informations/interactions.
+@interface SuggestionsExpandableItem
+    : CollectionViewItem<SuggestionsExpandableArticle>
+
+// 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;
+
+// Delegate for the configured cells.
+@property(nonatomic, weak) id<SuggestionsExpandableCellDelegate> delegate;
+
+@end
+
+// Corresponding cell of an expandable article.
+@interface SuggestionsExpandableCell : MDCCollectionViewCell
+
+@property(nonatomic, weak) id<SuggestionsExpandableCellDelegate> delegate;
+@property(nonatomic, readonly, strong) UILabel* titleLabel;
+@property(nonatomic, readonly, strong) UILabel* subtitleLabel;
+@property(nonatomic, readonly, strong) UILabel* detailLabel;
+@property(nonatomic, strong) UIImageView* imageView;
+
+- (void)expand;
+- (void)collapse;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_EXPANDABLE_ITEM_H_