Add context menu when long press on a reading list entry

ios/chrome/browser/ui/reading_list/reading_list_view_controller.mm

Index: ios/chrome/browser/ui/reading_list/reading_list_view_controller.mm
diff --git a/ios/chrome/browser/ui/reading_list/reading_list_view_controller.mm b/ios/chrome/browser/ui/reading_list/reading_list_view_controller.mm
index 96d7bb9a1e99cf924edbb6fcb23c5285c7ce99aa..4c32d3f7bf9ecb5b97a84846995bfcbba45f5d01 100644
--- a/ios/chrome/browser/ui/reading_list/reading_list_view_controller.mm
+++ b/ios/chrome/browser/ui/reading_list/reading_list_view_controller.mm
@@ -19,8 +19,6 @@
 #include "components/url_formatter/url_formatter.h"
 #include "ios/chrome/browser/reading_list/offline_url_utils.h"
 #include "ios/chrome/browser/reading_list/reading_list_download_service.h"
-#import "ios/chrome/browser/tabs/tab.h"
-#import "ios/chrome/browser/tabs/tab_model.h"
 #import "ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
@@ -126,6 +124,10 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
 - (BOOL)hasItemInSection:(SectionIdentifier)sectionIdentifier;
 // Adds an empty background if needed.
 - (void)collectionIsEmpty;
+// Handles a long press.
+- (void)handleLongPress:(UILongPressGestureRecognizer*)gestureRecognizer;
+// Stops observing the ReadingListModel.
+- (void)stopObservingReadingListModel;
 // Updates the toolbar state according to the selected items.
 - (void)updateToolbarState;
 // Displays an action sheet to let the user choose to mark all the elements as
@@ -186,16 +188,14 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
 
 @implementation ReadingListViewController
 @synthesize readingListModel = _readingListModel;
-@synthesize tabModel = _tabModel;
 @synthesize largeIconService = _largeIconService;
 @synthesize readingListDownloadService = _readingListDownloadService;
 @synthesize attributesProvider = _attributesProvider;
-@synthesize audience = _audience;
+@synthesize delegate = _delegate;
 
 #pragma mark lifecycle
 
 - (instancetype)initWithModel:(ReadingListModel*)model
-                      tabModel:(TabModel*)tabModel
               largeIconService:(favicon::LargeIconService*)largeIconService
     readingListDownloadService:
         (ReadingListDownloadService*)readingListDownloadService
@@ -206,7 +206,6 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
     _toolbar = toolbar;
 
     _readingListModel = model;
-    _tabModel = tabModel;
     _largeIconService = largeIconService;
     _readingListDownloadService = readingListDownloadService;
     _emptyCollectionBackground = [self emptyCollectionBackground];
@@ -237,10 +236,11 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   [_toolbar setState:toolbarState];
 }
 
-- (void)setAudience:(id<ReadingListViewControllerAudience>)audience {
-  _audience = audience;
+- (void)setDelegate:(id<ReadingListViewControllerDelegate>)delegate {
+  _delegate = delegate;
   if (self.readingListModel->loaded())
-    [audience setCollectionHasItems:self.readingListModel->size() > 0];
+    [delegate readingListViewController:self
+                               hasItems:(self.readingListModel->size() > 0)];
 }
 
 #pragma mark - UIViewController
@@ -262,6 +262,12 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   // Customize collection view settings.
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
   self.styler.separatorInset = UIEdgeInsetsMake(0, 16, 0, 16);
+
+  UILongPressGestureRecognizer* longPressRecognizer =
+      [[UILongPressGestureRecognizer alloc]
+          initWithTarget:self
+                  action:@selector(handleLongPress:)];
+  [self.collectionView addGestureRecognizer:longPressRecognizer];
 }
 
 #pragma mark - UICollectionViewDelegate
@@ -287,7 +293,8 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   if (self.editor.editing) {
     [self updateToolbarState];
   } else {
-    [self openItemAtIndexPath:indexPath];
+    [self.delegate readingListViewController:self
+                         openItemAtIndexPath:indexPath];
   }
 }
 
@@ -368,7 +375,16 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
     [self reloadData];
 }
 
-#pragma mark - private methods
+#pragma mark - Public methods
+
+- (void)reloadData {
+  [self loadModel];
+  if ([self isViewLoaded]) {
+    [self.collectionView reloadData];
+  }
+}
+
+#pragma mark - Private methods
 
 - (UIView*)emptyCollectionBackground {
   UIView* emptyCollectionBackground = [[UIView alloc] initWithFrame:CGRectZero];
@@ -449,30 +465,6 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   return emptyCollectionBackground;
 }
 
-- (void)openItemAtIndexPath:(NSIndexPath*)indexPath {
-  ReadingListCollectionViewItem* readingListItem =
-      base::mac::ObjCCastStrict<ReadingListCollectionViewItem>(
-          [self.collectionViewModel itemAtIndexPath:indexPath]);
-  const ReadingListEntry* entry =
-      self.readingListModel->GetEntryByURL(readingListItem.url);
-  if (!entry) {
-    [self reloadData];
-    return;
-  }
-
-  base::RecordAction(base::UserMetricsAction("MobileReadingListOpen"));
-
-  // Reset observer to prevent further model update notifications.
-  _modelBridge.reset();
-
-  Tab* currentTab = _tabModel.currentTab;
-  DCHECK(currentTab);
-  web::NavigationManager::WebLoadParams params(entry->URL());
-  params.transition_type = ui::PageTransition::PAGE_TRANSITION_AUTO_BOOKMARK;
-  [currentTab webState]->GetNavigationManager()->LoadURLWithParams(params);
-  [self dismiss];
-}
-
 - (void)donePressed {
   if ([self.editor isEditing]) {
     [self exitEditingModeAnimated:NO];
@@ -483,9 +475,9 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
 - (void)dismiss {
   _readingListModel->MarkAllSeen();
   // Reset observer to prevent further model update notifications.
-  _modelBridge.reset();
+  [self stopObservingReadingListModel];
   [_actionSheet stop];
-  [self.audience dismiss];
+  [self.delegate dismissReadingListViewController:self];
 }
 
 - (void)loadModel {
@@ -497,7 +489,7 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
     self.collectionView.alwaysBounceVertical = YES;
     [self loadItems];
     self.collectionView.backgroundView = nil;
-    [self.audience setCollectionHasItems:YES];
+    [self.delegate readingListViewController:self hasItems:YES];
   }
 }
 
@@ -542,13 +534,6 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   }
 }
 
-- (void)reloadData {
-  [self loadModel];
-  if ([self isViewLoaded]) {
-    [self.collectionView reloadData];
-  }
-}
-
 - (void)applyPendingUpdates {
   if (_modelHasBeenModified) {
     [self reloadData];
@@ -634,7 +619,17 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   // The collection is empty, add background.
   self.collectionView.alwaysBounceVertical = NO;
   self.collectionView.backgroundView = _emptyCollectionBackground;
-  [self.audience setCollectionHasItems:NO];
+  [self.delegate readingListViewController:self hasItems:NO];
+}
+
+- (void)handleLongPress:(UILongPressGestureRecognizer*)gestureRecognizer {
+  [self.delegate readingListViewController:self
+                     didRecognizeLongPress:gestureRecognizer
+                                duringEdit:self.editor.editing];
+}
+
+- (void)stopObservingReadingListModel {
+  _modelBridge.reset();
 }
 
 #pragma mark - ReadingListToolbarDelegate