Upstream Chrome on iOS source code [8/11].

ios/chrome/browser/ui/settings/translate_collection_view_controller.mm

Index: ios/chrome/browser/ui/settings/translate_collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/settings/translate_collection_view_controller.mm b/ios/chrome/browser/ui/settings/translate_collection_view_controller.mm
new file mode 100644
index 0000000000000000000000000000000000000000..6dd5036544e84794861e7651d7d28ea41176e6e0
--- /dev/null
+++ b/ios/chrome/browser/ui/settings/translate_collection_view_controller.mm
@@ -0,0 +1,259 @@
+// Copyright 2015 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/settings/translate_collection_view_controller.h"
+
+#import <Foundation/Foundation.h>
+#include <memory>
+
+#include "base/mac/foundation_util.h"
+#include "components/google/core/browser/google_util.h"
+#include "components/prefs/pref_member.h"
+#include "components/prefs/pref_service.h"
+#include "components/translate/core/browser/translate_prefs.h"
+#include "components/translate/core/common/translate_pref_names.h"
+#include "ios/chrome/browser/application_context.h"
+#import "ios/chrome/browser/translate/chrome_ios_translate_client.h"
+#import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_footer_item.h"
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_switch_item.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"
+#import "ios/chrome/browser/ui/settings/settings_utils.h"
+#import "ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h"
+#include "ios/chrome/grit/ios_chromium_strings.h"
+#include "ios/chrome/grit/ios_strings.h"
+#import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
+#import "ios/third_party/material_components_ios/src/components/Snackbar/src/MaterialSnackbar.h"
+#import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "url/gurl.h"
+
+namespace {
+
+typedef NS_ENUM(NSInteger, SectionIdentifier) {
+  SectionIdentifierTranslate = kSectionIdentifierEnumZero,
+  SectionIdentifierFooter,
+};
+
+typedef NS_ENUM(NSInteger, ItemType) {
+  ItemTypeTranslate = kItemTypeEnumZero,
+  ItemTypeResetTranslate,
+  ItemTypeFooter,
+};
+
+const char kTranslateLearnMoreUrl[] =
+    "https://support.google.com/chrome/answer/3214105?p=mobile_translate";
+NSString* const kTranslateSettingsCategory = @"ChromeTranslateSettings";
+
+}  // namespace
+
+@interface TranslateCollectionViewController ()<BooleanObserver> {
+  // Profile preferences.
+  PrefService* _prefs;  // weak
+  base::scoped_nsobject<PrefBackedBoolean> _translationEnabled;
+  // The item related to the switch for the translation setting.
+  base::scoped_nsobject<CollectionViewSwitchItem> _translationItem;
+}
+
+@end
+
+@implementation TranslateCollectionViewController
+
+#pragma mark - Initialization
+
+- (instancetype)initWithPrefs:(PrefService*)prefs {
+  DCHECK(prefs);
+  self = [super initWithStyle:CollectionViewControllerStyleAppBar];
+  if (self) {
+    self.title = l10n_util::GetNSString(IDS_IOS_TRANSLATE_SETTING);
+    self.collectionViewAccessibilityIdentifier =
+        @"translate_settings_view_controller";
+    _prefs = prefs;
+    _translationEnabled.reset([[PrefBackedBoolean alloc]
+        initWithPrefService:_prefs
+                   prefName:prefs::kEnableTranslate]);
+    [_translationEnabled setObserver:self];
+    [self loadModel];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [_translationEnabled setObserver:nil];
+  [super dealloc];
+}
+
+#pragma mark - SettingsRootCollectionViewController
+
+- (void)loadModel {
+  [super loadModel];
+  CollectionViewModel* model = self.collectionViewModel;
+
+  // Translate Section
+  [model addSectionWithIdentifier:SectionIdentifierTranslate];
+  _translationItem.reset(
+      [[CollectionViewSwitchItem alloc] initWithType:ItemTypeTranslate]);
+  _translationItem.get().text =
+      l10n_util::GetNSString(IDS_IOS_TRANSLATE_SETTING);
+  _translationItem.get().on = [_translationEnabled value];
+  [model addItem:_translationItem
+      toSectionWithIdentifier:SectionIdentifierTranslate];
+
+  CollectionViewTextItem* resetTranslate = [[[CollectionViewTextItem alloc]
+      initWithType:ItemTypeResetTranslate] autorelease];
+  resetTranslate.text = l10n_util::GetNSString(IDS_IOS_TRANSLATE_SETTING_RESET);
+  resetTranslate.accessibilityTraits |= UIAccessibilityTraitButton;
+  [model addItem:resetTranslate
+      toSectionWithIdentifier:SectionIdentifierTranslate];
+
+  // Footer Section
+  [model addSectionWithIdentifier:SectionIdentifierFooter];
+  CollectionViewFooterItem* footer = [[[CollectionViewFooterItem alloc]
+      initWithType:ItemTypeFooter] autorelease];
+  footer.text = l10n_util::GetNSString(IDS_IOS_TRANSLATE_SETTING_DESCRIPTION);
+  footer.linkURL = google_util::AppendGoogleLocaleParam(
+      GURL(kTranslateLearnMoreUrl),
+      GetApplicationContext()->GetApplicationLocale());
+  footer.linkDelegate = self;
+  [model addItem:footer toSectionWithIdentifier:SectionIdentifierFooter];
+}
+
+#pragma mark UICollectionViewDataSource
+
+- (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
+                 cellForItemAtIndexPath:(NSIndexPath*)indexPath {
+  UICollectionViewCell* cell =
+      [super collectionView:collectionView cellForItemAtIndexPath:indexPath];
+  NSInteger itemType =
+      [self.collectionViewModel itemTypeForIndexPath:indexPath];
+
+  switch (itemType) {
+    case ItemTypeTranslate: {
+      CollectionViewSwitchCell* switchCell =
+          base::mac::ObjCCastStrict<CollectionViewSwitchCell>(cell);
+      [switchCell.switchView addTarget:self
+                                action:@selector(translateToggled:)
+                      forControlEvents:UIControlEventValueChanged];
+      break;
+    }
+    case ItemTypeResetTranslate: {
+      MDCCollectionViewTextCell* textCell =
+          base::mac::ObjCCastStrict<MDCCollectionViewTextCell>(cell);
+      textCell.textLabel.font =
+          [[MDFRobotoFontLoader sharedInstance] mediumFontOfSize:14];
+      break;
+    }
+    default:
+      break;
+  }
+
+  return cell;
+}
+
+#pragma mark UICollectionViewDelegate
+- (void)collectionView:(UICollectionView*)collectionView
+    didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
+  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
+
+  NSInteger itemType =
+      [self.collectionViewModel itemTypeForIndexPath:indexPath];
+
+  if (itemType == ItemTypeResetTranslate) {
+    std::unique_ptr<translate::TranslatePrefs> translatePrefs(
+        ChromeIOSTranslateClient::CreateTranslatePrefs(_prefs));
+    translatePrefs->ResetToDefaults();
+    NSString* messageText =
+        l10n_util::GetNSString(IDS_IOS_TRANSLATE_SETTING_RESET_NOTIFICATION);
+    MDCSnackbarMessage* message =
+        [MDCSnackbarMessage messageWithText:messageText];
+    message.category = kTranslateSettingsCategory;
+    [MDCSnackbarManager showMessage:message];
+  }
+}
+
+#pragma mark MDCCollectionViewStylingDelegate
+
+- (MDCCollectionViewCellStyle)collectionView:(UICollectionView*)collectionView
+                         cellStyleForSection:(NSInteger)section {
+  NSInteger sectionIdentifier =
+      [self.collectionViewModel sectionIdentifierForSection:section];
+
+  if (sectionIdentifier == SectionIdentifierFooter) {
+    return MDCCollectionViewCellStyleDefault;
+  }
+
+  return self.styler.cellStyle;
+}
+
+- (BOOL)collectionView:(UICollectionView*)collectionView
+    shouldHideItemBackgroundAtIndexPath:(NSIndexPath*)indexPath {
+  NSInteger sectionIdentifier =
+      [self.collectionViewModel sectionIdentifierForSection:indexPath.section];
+
+  if (sectionIdentifier == SectionIdentifierFooter) {
+    return YES;
+  }
+
+  return NO;
+}
+
+- (CGFloat)collectionView:(UICollectionView*)collectionView
+    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
+  CollectionViewItem* item =
+      [self.collectionViewModel itemAtIndexPath:indexPath];
+
+  if (item.type == ItemTypeFooter)
+    return [MDCCollectionViewCell
+        cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
+                           forItem:item];
+  return MDCCellDefaultOneLineHeight;
+}
+
+- (BOOL)collectionView:(UICollectionView*)collectionView
+    hidesInkViewAtIndexPath:(NSIndexPath*)indexPath {
+  NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
+  switch (type) {
+    case ItemTypeFooter:
+    case ItemTypeTranslate:
+      return YES;
+    default:
+      return NO;
+  }
+}
+
+#pragma mark - BooleanObserver
+
+- (void)booleanDidChange:(id<ObservableBoolean>)observableBoolean {
+  DCHECK_EQ(observableBoolean, _translationEnabled.get());
+
+  // Update the item.
+  _translationItem.get().on = [_translationEnabled value];
+
+  // Update the cell.
+  [self reconfigureCellsForItems:@[ _translationItem ]
+         inSectionWithIdentifier:SectionIdentifierTranslate];
+}
+
+#pragma mark - Actions
+
+- (void)translateToggled:(id)sender {
+  NSIndexPath* switchPath = [self.collectionViewModel
+      indexPathForItemType:ItemTypeTranslate
+         sectionIdentifier:SectionIdentifierTranslate];
+
+  CollectionViewSwitchItem* switchItem =
+      base::mac::ObjCCastStrict<CollectionViewSwitchItem>(
+          [self.collectionViewModel itemAtIndexPath:switchPath]);
+  CollectionViewSwitchCell* switchCell =
+      base::mac::ObjCCastStrict<CollectionViewSwitchCell>(
+          [self.collectionView cellForItemAtIndexPath:switchPath]);
+
+  DCHECK_EQ(switchCell.switchView, sender);
+  BOOL isOn = switchCell.switchView.isOn;
+  switchItem.on = isOn;
+  [_translationEnabled setValue:isOn];
+}
+
+@end