Creates the Suggestions UI

This CL creates the Suggestions UI with a Collection View.

BUG=679369

Review-Url: https://codereview.chromium.org/2619353004
Cr-Commit-Position: refs/heads/master@{#442850}

ios/chrome/browser/ui/suggestions/BUILD.gn

+# 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.
+
+source_set("suggestions") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [
+    "suggestions_commands.h",
+    "suggestions_item_actions.h",
+    "suggestions_view_controller.h",
+    "suggestions_view_controller.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/chrome/browser/ui",
+    "//ios/chrome/browser/ui/collection_view",
+    "//ios/third_party/material_roboto_font_loader_ios",
+  ]
+  public_deps = [
+    "//ios/third_party/material_components_ios",
+  ]
+}

ios/chrome/browser/ui/suggestions/OWNERS

+gambard@chromium.org

ios/chrome/browser/ui/suggestions/suggestions_commands.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_SUGGESTIONS_SUGGESTIONS_COMMANDS_H_
+#define IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_COMMANDS_H_
+
+// Commands protocol for the SuggestionsViewController.
+@protocol SuggestionsCommands
+
+// Adds a new empty SuggestionItem.
+- (void)addEmptyItem;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_COMMANDS_H_

ios/chrome/browser/ui/suggestions/suggestions_item_actions.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_SUGGESTIONS_SUGGESTIONS_ITEM_ACTIONS_H_
+#define IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_ITEM_ACTIONS_H_
+
+// Protocol handling the actions sent in the responder chain by the suggestions
+// items.
+@protocol SuggestionsItemActions
+
+// Sent through the responder chain when the button of a suggestion item is
+// pressed.
+- (void)addNewItem:(id)sender;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_ITEM_ACTIONS_H_

ios/chrome/browser/ui/suggestions/suggestions_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_SUGGESTIONS_SUGGESTIONS_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
+
+@protocol SuggestionsCommands;
+
+// CollectionViewController to display the suggestions items.
+@interface SuggestionsViewController : CollectionViewController
+
+// Handler for the commands sent by the SuggestionsViewController.
+@property(nonatomic, weak) id<SuggestionsCommands> suggestionCommandHandler;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SUGGESTIONS_SUGGESTIONS_VIEW_CONTROLLER_H_

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"
+
+#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/suggestions_commands.h"
+#import "ios/chrome/browser/ui/suggestions/suggestions_item_actions.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SuggestionsViewController ()<SuggestionsItemActions>
+
+@end
+
+@implementation SuggestionsViewController
+
+@synthesize suggestionCommandHandler = _suggestionCommandHandler;
+
+#pragma mark - UIViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  self.collectionView.delegate = self;
+  self.styler.cellStyle = MDCCollectionViewCellStyleCard;
+}
+
+#pragma mark - MDCCollectionViewStylingDelegate
+
+- (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 - SuggestionsItemActions
+
+- (void)addNewItem:(id)sender {
+  [self.suggestionCommandHandler addEmptyItem];
+}
+
+@end

ios/showcase/BUILD.gn

@@ -28,6 +28,7 @@ group("features") {
     "//ios/chrome/browser/ui/tools:tools_ui",
     "//ios/showcase/settings",
     "//ios/showcase/strip",
+    "//ios/showcase/suggestions",
     "//ios/showcase/tab_grid",
     "//ios/showcase/uikit_table_view_cell",
   ]

ios/showcase/core/BUILD.gn

@@ -25,6 +25,13 @@ source_set("main") {
   ]
   deps = [
     ":core",
+
+    # Needed to disable the tests hooks.
+    "//ios/chrome/app:tests_fake_hook",
+
+    # Needed for including ios/chrome/browser/ui.
+    "//ios/chrome/browser/tabs:tabs_internal",
+    "//ios/chrome/browser/ui:ui_internal",
   ]
   libs = [ "UIKit.framework" ]
   configs += [ "//build/config/compiler:enable_arc" ]

ios/showcase/core/showcase_model.mm

@@ -21,6 +21,11 @@
       showcase::kClassForInstantiationKey : @"SettingsCoordinator",
       showcase::kUseCaseKey : @"Main settings screen",
     },
+    @{
+      showcase::kClassForDisplayKey : @"SuggestionsViewController",
+      showcase::kClassForInstantiationKey : @"SCSuggestionsCoordinator",
+      showcase::kUseCaseKey : @"New Suggestions UI",
+    },
     @{
       showcase::kClassForDisplayKey : @"MenuViewController",
       showcase::kClassForInstantiationKey : @"MenuViewController",

ios/showcase/suggestions/BUILD.gn

+# 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.
+
+source_set("suggestions") {
+  sources = [
+    "sc_suggestions_coordinator.h",
+    "sc_suggestions_coordinator.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/chrome/browser/ui/suggestions",
+    "//ios/showcase/common",
+  ]
+  libs = [ "UIKit.framework" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("eg_tests") {
+  testonly = true
+  sources = [
+    "sc_suggestions_egtest.mm",
+  ]
+  deps = [
+    "//ios/showcase/test",
+    "//ios/third_party/earl_grey",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}

ios/showcase/suggestions/DEPS

+include_rules = [
+  "+ios/third_party/material_components_ios",
+]

ios/showcase/suggestions/sc_suggestions_coordinator.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_SHOWCASE_SUGGESTIONS_SC_SUGGESTIONS_COORDINATOR_H_
+#define IOS_SHOWCASE_SUGGESTIONS_SC_SUGGESTIONS_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/showcase/common/coordinator.h"
+
+@interface SCSuggestionsCoordinator : NSObject<Coordinator>
+
+// Redefined to be a UINavigationController.
+@property(nonatomic, weak) UINavigationController* baseViewController;
+
+@end
+
+#endif  // IOS_SHOWCASE_SUGGESTIONS_SC_SUGGESTIONS_COORDINATOR_H_

ios/showcase/suggestions/sc_suggestions_coordinator.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/showcase/suggestions/sc_suggestions_coordinator.h"
+
+#import "ios/chrome/browser/ui/suggestions/suggestions_commands.h"
+#import "ios/chrome/browser/ui/suggestions/suggestions_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SCSuggestionsCoordinator ()<SuggestionsCommands>
+
+@end
+
+@implementation SCSuggestionsCoordinator
+
+@synthesize baseViewController;
+
+#pragma mark - Coordinator
+
+- (void)start {
+  SuggestionsViewController* suggestion = [[SuggestionsViewController alloc]
+      initWithStyle:CollectionViewControllerStyleDefault];
+
+  suggestion.suggestionCommandHandler = self;
+
+  [self.baseViewController pushViewController:suggestion animated:YES];
+}
+
+#pragma mark - SuggestionsCommands
+
+- (void)addEmptyItem {
+}
+
+@end

ios/showcase/suggestions/sc_suggestions_egtest.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 <EarlGrey/EarlGrey.h>
+
+#import "ios/showcase/test/showcase_test_case.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+// Tests for the suggestions view controller.
+@interface SCSuggestionsTestCase : ShowcaseTestCase
+@end
+
+@implementation SCSuggestionsTestCase
+
+// Tests launching TabGridViewController and tapping a cell.
+- (void)testLaunchAndTappingCell {
+  [[EarlGrey selectElementWithMatcher:grey_text(@"SuggestionsViewController")]
+      performAction:grey_tap()];
+}
+
+@end