Suggestions UI - stack item

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

 // Copyright 2016 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_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/browser/ui/suggestions/expandable_item.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_collection_updater.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_commands.h"
 #import "ios/chrome/browser/ui/suggestions/suggestions_item_actions.h"
+#import "ios/chrome/browser/ui/suggestions/suggestions_stack_item.h"
+#import "ios/chrome/browser/ui/suggestions/suggestions_stack_item_actions.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 const NSTimeInterval kAnimationDuration = 0.35;
 }  // namespace
 
-@interface SuggestionsViewController ()<SuggestionsItemActions>
+@interface SuggestionsViewController ()<SuggestionsItemActions,
+                                        SuggestionsStackItemActions>
 
 @property(nonatomic, strong) SuggestionsCollectionUpdater* collectionUpdater;
 
 // Expand or collapse the |cell|, if it is a SuggestionsExpandableCell,
 // according to |expand|.
 - (void)expand:(BOOL)expand cell:(UICollectionViewCell*)cell;
 
 @end
 
 @implementation SuggestionsViewController
 
 @synthesize suggestionCommandHandler = _suggestionCommandHandler;
 @synthesize collectionUpdater = _collectionUpdater;
 
 #pragma mark - UIViewController
 
 - (void)viewDidLoad {
   [super viewDidLoad];
 
-  _collectionUpdater = [[SuggestionsCollectionUpdater alloc]
-      initWithCollectionViewController:self];
+  _collectionUpdater = [[SuggestionsCollectionUpdater alloc] init];
+  _collectionUpdater.collectionViewController = self;
 
   self.collectionView.delegate = self;
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
 }
 
-#pragma mark - MDCCollectionViewStylingDelegate
+#pragma mark - UICollectionViewDelegate
 
-- (CGFloat)collectionView:(UICollectionView*)collectionView
-    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
+- (void)collectionView:(UICollectionView*)collectionView
+    didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
+  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
+
   CollectionViewItem* item =
       [self.collectionViewModel itemAtIndexPath:indexPath];
-  UIEdgeInsets inset = [self collectionView:collectionView
-                                     layout:collectionView.collectionViewLayout
-                     insetForSectionAtIndex:indexPath.section];
-
-  return [MDCCollectionViewCell
-      cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds) -
-                                 inset.left - inset.right
-                         forItem:item];
+  if (item.type == ItemTypeStack) {
+    [self.suggestionCommandHandler openReadingList];
+  }
 }
 
 #pragma mark - SuggestionsExpandableCellDelegate
 
 - (void)collapseCell:(UICollectionViewCell*)cell {
   [self expand:NO cell:cell];
 }
 
 - (void)expandCell:(UICollectionViewCell*)cell {
   [self expand:YES cell:cell];
 }
 
 #pragma mark - SuggestionsItemActions
 
 - (void)addNewItem:(id)sender {
   [self.suggestionCommandHandler addEmptyItem];
 }
 
 #pragma mark - SuggestionsCollectionUpdater forwarding
 
 - (void)addTextItem:(NSString*)title
            subtitle:(NSString*)subtitle
           toSection:(NSInteger)inputSection {
   [self.collectionUpdater addTextItem:title
                              subtitle:subtitle
                             toSection:inputSection];
 }
 
+#pragma mark - SuggestionsStackItemActions
+
+- (void)openReadingListFirstItem:(id)sender {
+  [self.suggestionCommandHandler openFirstPageOfReadingList];
+}
+
+#pragma mark - MDCCollectionViewStylingDelegate
+
+- (UIColor*)collectionView:(nonnull UICollectionView*)collectionView
+    cellBackgroundColorAtIndexPath:(nonnull NSIndexPath*)indexPath {
+  if ([self.collectionUpdater
+          shouldUseCustomStyleForSection:indexPath.section]) {
+    return [UIColor clearColor];
+  }
+  return [UIColor whiteColor];
+}
+
+- (BOOL)collectionView:(nonnull UICollectionView*)collectionView
+    shouldHideItemBackgroundAtIndexPath:(nonnull NSIndexPath*)indexPath {
+  if ([self.collectionUpdater
+          shouldUseCustomStyleForSection:indexPath.section]) {
+    return YES;
+  }
+  return NO;
+}
+
+- (CGFloat)collectionView:(UICollectionView*)collectionView
+    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
+  CollectionViewItem* item =
+      [self.collectionViewModel itemAtIndexPath:indexPath];
+  UIEdgeInsets inset = [self collectionView:collectionView
+                                     layout:collectionView.collectionViewLayout
+                     insetForSectionAtIndex:indexPath.section];
+
+  return [MDCCollectionViewCell
+      cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds) -
+                                 inset.left - inset.right
+                         forItem:item];
+}
+
 #pragma mark - Private
 
 - (void)expand:(BOOL)expand cell:(UICollectionViewCell*)cell {
   NSIndexPath* indexPath = [self.collectionView indexPathForCell:cell];
   CollectionViewItem* item =
       [self.collectionViewModel itemAtIndexPath:indexPath];
   if ([item conformsToProtocol:@protocol(SuggestionsExpandableArticle)]) {
     id<SuggestionsExpandableArticle> expandableItem =
         (id<SuggestionsExpandableArticle>)item;
 
     NSInteger sectionIdentifier = [self.collectionViewModel
         sectionIdentifierForSection:indexPath.section];
 
     expandableItem.expanded = expand;
     [self reconfigureCellsForItems:@[ item ]
            inSectionWithIdentifier:sectionIdentifier];
 
     [UIView
         animateWithDuration:kAnimationDuration
                  animations:^{
                    [self.collectionView.collectionViewLayout invalidateLayout];
                  }];
   }
 }
 
 @end