Upstream Chrome on iOS source code [5/11].

ios/chrome/browser/ui/history/history_collection_view_controller.h

+// 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_COLLECTION_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_COLLECTION_VIEW_CONTROLLER_H_
+
+#import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
+
+#include "base/ios/block_types.h"
+
+namespace ios {
+class ChromeBrowserState;
+}
+
+@class HistoryCollectionViewController;
+@protocol UrlLoader;
+
+// Delegate for the history collection view controller.
+@protocol HistoryCollectionViewControllerDelegate<NSObject>
+// Notifies the delegate that history should be dismissed.
+- (void)historyCollectionViewController:
+            (HistoryCollectionViewController*)controller
+              shouldCloseWithCompletion:(ProceduralBlock)completionHandler;
+// Notifies the delegate that the collection view has scrolled to |offset|.
+- (void)historyCollectionViewController:
+            (HistoryCollectionViewController*)controller
+                      didScrollToOffset:(CGPoint)offset;
+// Notifies the delegate that history entries have been loaded or changed.
+- (void)historyCollectionViewControllerDidChangeEntries:
+    (HistoryCollectionViewController*)controller;
+// Notifies the delegate that history entries have been selected or deselected.
+- (void)historyCollectionViewControllerDidChangeEntrySelection:
+    (HistoryCollectionViewController*)controller;
+@end
+
+// View controller for displaying a collection of history entries.
+@interface HistoryCollectionViewController : CollectionViewController
+// YES if the collection view is in editing mode. Setting |editing| turns
+// editing mode on or off accordingly.
+@property(nonatomic, assign, getter=isEditing) BOOL editing;
+// YES if the the search bar is present.
+@property(nonatomic, assign, getter=isSearching) BOOL searching;
+// YES if collection is currently displaying any history entries.
+@property(nonatomic, assign, readonly) BOOL hasHistoryEntries;
+// YES if the collection view has selected entries while in editing mode.
+@property(nonatomic, assign, readonly) BOOL hasSelectedEntries;
+
+- (instancetype)initWithLoader:(id<UrlLoader>)loader
+                  browserState:(ios::ChromeBrowserState*)browserState
+                      delegate:
+                          (id<HistoryCollectionViewControllerDelegate>)delegate
+    NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithStyle:(CollectionViewControllerStyle)style
+    NS_UNAVAILABLE;
+
+// Search history for text |query| and display the results. |query| may be nil.
+// If query is empty, show all history.
+- (void)showHistoryMatchingQuery:(NSString*)query;
+
+// Deletes selected items from browser history and removes them from the
+// collection.
+- (void)deleteSelectedItemsFromHistory;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_COLLECTION_VIEW_CONTROLLER_H_