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ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm

Index: ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm b/ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm
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+// Copyright 2014 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/bookmarks/bookmark_folder_view_controller.h"
+
+#include <memory>
+#include <vector>
+
+#import "base/ios/weak_nsobject.h"
+#include "base/logging.h"
+#include "base/mac/objc_property_releaser.h"
+#include "base/mac/scoped_nsobject.h"
+#include "base/strings/sys_string_conversions.h"
+#include "components/bookmarks/browser/bookmark_model.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_folder_editor_view_controller.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_folder_table_view_cell.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_model_bridge_observer.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_navigation_controller.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.h"
+#import "ios/chrome/browser/ui/icons/chrome_icon.h"
+#import "ios/chrome/browser/ui/material_components/utils.h"
+#include "ios/chrome/grit/ios_strings.h"
+#import "ios/third_party/material_components_ios/src/components/AppBar/src/MaterialAppBar.h"
+#include "ui/base/l10n/l10n_util_mac.h"
+
+using bookmarks::BookmarkNode;
+
+namespace {
+
+// The height of every folder cell.
+const CGFloat kFolderCellHeight = 48.0;
+
+// Height of section headers/footers.
+const CGFloat kSectionHeaderHeight = 8.0;
+const CGFloat kSectionFooterHeight = 8.0;
+
+// Enum for the available sections.
+// First section displays a cell to create a new folder.
+// The second section displays as many folders as are available.
+typedef enum {
+  BookmarkFolderSectionDefault = 0,
+  BookmarkFolderSectionFolders,
+} BookmarkFolderSection;
+const NSInteger BookmarkFolderSectionCount = 2;
+
+}  // namespace
+
+@interface BookmarkFolderViewController ()<
+    BookmarkFolderEditorViewControllerDelegate,
+    BookmarkModelBridgeObserver,
+    UITableViewDataSource,
+    UITableViewDelegate> {
+  std::set<const BookmarkNode*> _editedNodes;
+  std::vector<const BookmarkNode*> _folders;
+  std::unique_ptr<bookmarks::BookmarkModelBridge> _modelBridge;
+  base::scoped_nsobject<MDCAppBar> _appBar;
+  base::mac::ObjCPropertyReleaser
+      _propertyReleaser_BookmarkFolderViewController;
+}
+
+// Should the controller setup Cancel and Done buttons instead of a back button.
+@property(nonatomic, assign) BOOL allowsCancel;
+
+// Should the controller setup a new-folder button.
+@property(nonatomic, assign) BOOL allowsNewFolders;
+
+// Reference to the main bookmark model.
+@property(nonatomic, assign) bookmarks::BookmarkModel* bookmarkModel;
+
+// The currently selected folder.
+@property(nonatomic, readonly) const BookmarkNode* selectedFolder;
+
+// The view controller to present when creating a new folder.
+@property(nonatomic, retain)
+    BookmarkFolderEditorViewController* folderAddController;
+
+// A linear list of folders.
+@property(nonatomic, assign, readonly)
+    const std::vector<const BookmarkNode*>& folders;
+
+// The table view that displays the options and folders.
+@property(nonatomic, retain) UITableView* tableView;
+
+// Returns the cell for the default section and the given |row|.
+- (BookmarkFolderTableViewCell*)defaultSectionCellForRow:(NSInteger)row;
+
+// Returns a folder cell for the folder at |row| in |self.folders|.
+- (BookmarkFolderTableViewCell*)folderSectionCellForRow:(NSInteger)row;
+
+// Reloads the folder list.
+- (void)reloadFolders;
+
+// Pushes on the navigation controller a view controller to create a new folder.
+- (void)pushFolderAddViewController;
+
+// Called when the user taps on a folder row. The cell is checked, the UI is
+// locked so that the user can't interact with it, then the delegate is
+// notified. Usual implementations of this delegate callback are to pop or
+// dismiss this controller on selection. The delay is here to let the user get a
+// visual feedback of the selection before this view disappears.
+- (void)delayedNotifyDelegateOfSelection;
+
+@end
+
+@implementation BookmarkFolderViewController
+
+@synthesize allowsCancel = _allowsCancel;
+@synthesize allowsNewFolders = _allowsNewFolders;
+@synthesize bookmarkModel = _bookmarkModel;
+@synthesize editedNodes = _editedNodes;
+@synthesize folderAddController = _folderAddController;
+@synthesize delegate = _delegate;
+@synthesize folders = _folders;
+@synthesize tableView = _tableView;
+@synthesize selectedFolder = _selectedFolder;
+
+- (instancetype)initWithBookmarkModel:(bookmarks::BookmarkModel*)bookmarkModel
+                     allowsNewFolders:(BOOL)allowsNewFolders
+                          editedNodes:
+                              (const std::set<const BookmarkNode*>&)nodes
+                         allowsCancel:(BOOL)allowsCancel
+                       selectedFolder:(const BookmarkNode*)selectedFolder {
+  DCHECK(bookmarkModel);
+  DCHECK(bookmarkModel->loaded());
+  DCHECK(selectedFolder == NULL || selectedFolder->is_folder());
+  self = [super initWithNibName:nil bundle:nil];
+  if (self) {
+    _propertyReleaser_BookmarkFolderViewController.Init(
+        self, [BookmarkFolderViewController class]);
+    _allowsCancel = allowsCancel;
+    _allowsNewFolders = allowsNewFolders;
+    _bookmarkModel = bookmarkModel;
+    _editedNodes = nodes;
+    _selectedFolder = selectedFolder;
+
+    // Set up the bookmark model oberver.
+    _modelBridge.reset(
+        new bookmarks::BookmarkModelBridge(self, _bookmarkModel));
+
+    _appBar.reset([[MDCAppBar alloc] init]);
+    [self addChildViewController:[_appBar headerViewController]];
+  }
+  return self;
+}
+
+- (void)changeSelectedFolder:(const BookmarkNode*)selectedFolder {
+  DCHECK(selectedFolder);
+  DCHECK(selectedFolder->is_folder());
+  _selectedFolder = selectedFolder;
+  [self.tableView reloadData];
+}
+
+- (void)dealloc {
+  _tableView.dataSource = nil;
+  _tableView.delegate = nil;
+  _folderAddController.delegate = nil;
+  [super dealloc];
+}
+
+- (UIStatusBarStyle)preferredStatusBarStyle {
+  return UIStatusBarStyleDefault;
+}
+
+#pragma mark - View lifecycle
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]) {
+    [self setEdgesForExtendedLayout:UIRectEdgeNone];
+  }
+  self.view.backgroundColor = [UIColor whiteColor];
+  self.view.accessibilityIdentifier = @"Folder Picker";
+
+  self.title = l10n_util::GetNSString(IDS_IOS_BOOKMARK_CHOOSE_GROUP_BUTTON);
+
+  base::scoped_nsobject<UIBarButtonItem> doneItem([[UIBarButtonItem alloc]
+      initWithTitle:l10n_util::GetNSString(
+                        IDS_IOS_BOOKMARK_EDIT_MODE_EXIT_MOBILE)
+              style:UIBarButtonItemStylePlain
+             target:self
+             action:@selector(done:)]);
+  doneItem.get().accessibilityIdentifier = @"Done";
+  self.navigationItem.rightBarButtonItem = doneItem;
+
+  if (self.allowsCancel) {
+    UIBarButtonItem* cancelItem =
+        [ChromeIcon templateBarButtonItemWithImage:[ChromeIcon closeIcon]
+                                            target:self
+                                            action:@selector(cancel:)];
+    cancelItem.accessibilityLabel =
+        l10n_util::GetNSString(IDS_IOS_BOOKMARK_NEW_CANCEL_BUTTON_LABEL);
+    cancelItem.accessibilityIdentifier = @"Cancel";
+    self.navigationItem.leftBarButtonItem = cancelItem;
+  } else {
+    UIBarButtonItem* backItem =
+        [ChromeIcon templateBarButtonItemWithImage:[ChromeIcon backIcon]
+                                            target:self
+                                            action:@selector(back:)];
+    backItem.accessibilityLabel =
+        l10n_util::GetNSString(IDS_IOS_BOOKMARK_NEW_BACK_LABEL);
+    backItem.accessibilityIdentifier = @"Back";
+    self.navigationItem.leftBarButtonItem = backItem;
+  }
+
+  // The table view.
+  base::scoped_nsobject<UITableView> tableView([[UITableView alloc]
+      initWithFrame:self.view.bounds
+              style:UITableViewStylePlain]);
+  tableView.get().dataSource = self;
+  tableView.get().delegate = self;
+  tableView.get().autoresizingMask =
+      UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+  tableView.get().separatorStyle = UITableViewCellSeparatorStyleNone;
+  [self.view addSubview:tableView];
+  [self.view sendSubviewToBack:tableView];
+  self.tableView = tableView;
+
+  // Add the app bar to the view hierarchy.  This must be done last, so that the
+  // app bar's views are the frontmost.
+  ConfigureAppBarWithCardStyle(_appBar);
+  [_appBar headerViewController].headerView.trackingScrollView = self.tableView;
+  [_appBar addSubviewsToParent];
+}
+
+- (void)viewWillAppear:(BOOL)animated {
+  [super viewWillAppear:animated];
+  [self reloadFolders];
+}
+
+- (UIViewController*)childViewControllerForStatusBarHidden {
+  return [_appBar headerViewController];
+}
+
+- (UIViewController*)childViewControllerForStatusBarStyle {
+  return [_appBar headerViewController];
+}
+
+#pragma mark - Accessibility
+
+- (BOOL)accessibilityPerformEscape {
+  [self.delegate folderPickerDidCancel:self];
+  return YES;
+}
+
+#pragma mark - UIScrollViewDelegate
+
+- (void)scrollViewDidScroll:(UIScrollView*)scrollView {
+  MDCFlexibleHeaderView* headerView = [_appBar headerViewController].headerView;
+  if (scrollView == headerView.trackingScrollView) {
+    [headerView trackingScrollViewDidScroll];
+  }
+}
+
+- (void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView {
+  MDCFlexibleHeaderView* headerView = [_appBar headerViewController].headerView;
+  if (scrollView == headerView.trackingScrollView) {
+    [headerView trackingScrollViewDidEndDecelerating];
+  }
+}
+
+- (void)scrollViewDidEndDragging:(UIScrollView*)scrollView
+                  willDecelerate:(BOOL)decelerate {
+  MDCFlexibleHeaderView* headerView = [_appBar headerViewController].headerView;
+  if (scrollView == headerView.trackingScrollView) {
+    [headerView trackingScrollViewDidEndDraggingWillDecelerate:decelerate];
+  }
+}
+
+- (void)scrollViewWillEndDragging:(UIScrollView*)scrollView
+                     withVelocity:(CGPoint)velocity
+              targetContentOffset:(inout CGPoint*)targetContentOffset {
+  MDCFlexibleHeaderView* headerView = [_appBar headerViewController].headerView;
+  if (scrollView == headerView.trackingScrollView) {
+    [headerView
+        trackingScrollViewWillEndDraggingWithVelocity:velocity
+                                  targetContentOffset:targetContentOffset];
+  }
+}
+
+#pragma mark - UITableViewDataSource
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView*)tableView {
+  return BookmarkFolderSectionCount;
+}
+
+- (NSInteger)tableView:(UITableView*)tableView
+    numberOfRowsInSection:(NSInteger)section {
+  switch (static_cast<BookmarkFolderSection>(section)) {
+    case BookmarkFolderSectionDefault:
+      return [self shouldShowDefaultSection] ? 1 : 0;
+
+    case BookmarkFolderSectionFolders:
+      return self.folders.size();
+  }
+  NOTREACHED();
+  return 0;
+}
+
+- (UITableViewCell*)tableView:(UITableView*)tableView
+        cellForRowAtIndexPath:(NSIndexPath*)indexPath {
+  BookmarkFolderTableViewCell* cell = nil;
+  switch (static_cast<BookmarkFolderSection>(indexPath.section)) {
+    case BookmarkFolderSectionDefault:
+      cell = [self defaultSectionCellForRow:indexPath.row];
+      break;
+
+    case BookmarkFolderSectionFolders:
+      cell = [self folderSectionCellForRow:indexPath.row];
+      break;
+  }
+  return cell;
+}
+
+#pragma mark - UITableViewDelegate
+
+- (CGFloat)tableView:(UITableView*)tableView
+    heightForRowAtIndexPath:(NSIndexPath*)indexPath {
+  return kFolderCellHeight;
+}
+
+- (CGFloat)tableView:(UITableView*)tableView
+    heightForHeaderInSection:(NSInteger)section {
+  switch (static_cast<BookmarkFolderSection>(section)) {
+    case BookmarkFolderSectionDefault:
+      return [self shouldShowDefaultSection] ? kSectionHeaderHeight : 0;
+
+    case BookmarkFolderSectionFolders:
+      return kSectionHeaderHeight;
+  }
+  NOTREACHED();
+  return 0;
+}
+
+- (UIView*)tableView:(UITableView*)tableView
+    viewForHeaderInSection:(NSInteger)section {
+  CGRect headerViewFrame =
+      CGRectMake(0, 0, CGRectGetWidth(tableView.frame),
+                 [self tableView:tableView heightForHeaderInSection:section]);
+  UIView* headerView =
+      [[[UIView alloc] initWithFrame:headerViewFrame] autorelease];
+  if (section == BookmarkFolderSectionFolders &&
+      [self shouldShowDefaultSection]) {
+    CGRect separatorFrame =
+        CGRectMake(0, 0, CGRectGetWidth(headerView.bounds),
+                   1.0 / [[UIScreen mainScreen] scale]);  // 1-pixel divider.
+    base::scoped_nsobject<UIView> separator(
+        [[UIView alloc] initWithFrame:separatorFrame]);
+    separator.get().autoresizingMask = UIViewAutoresizingFlexibleBottomMargin |
+                                       UIViewAutoresizingFlexibleWidth;
+    separator.get().backgroundColor = bookmark_utils_ios::separatorColor();
+    [headerView addSubview:separator];
+  }
+  return headerView;
+}
+
+- (CGFloat)tableView:(UITableView*)tableView
+    heightForFooterInSection:(NSInteger)section {
+  switch (static_cast<BookmarkFolderSection>(section)) {
+    case BookmarkFolderSectionDefault:
+      return [self shouldShowDefaultSection] ? kSectionFooterHeight : 0;
+
+    case BookmarkFolderSectionFolders:
+      return kSectionFooterHeight;
+  }
+  NOTREACHED();
+  return 0;
+}
+
+- (UIView*)tableView:(UITableView*)tableView
+    viewForFooterInSection:(NSInteger)section {
+  return [[[UIView alloc] init] autorelease];
+}
+
+- (void)tableView:(UITableView*)tableView
+    didSelectRowAtIndexPath:(NSIndexPath*)indexPath {
+  [tableView deselectRowAtIndexPath:indexPath animated:YES];
+  switch (static_cast<BookmarkFolderSection>(indexPath.section)) {
+    case BookmarkFolderSectionDefault:
+      [self pushFolderAddViewController];
+      break;
+
+    case BookmarkFolderSectionFolders: {
+      const BookmarkNode* folder = self.folders[indexPath.row];
+      [self changeSelectedFolder:folder];
+      [self delayedNotifyDelegateOfSelection];
+      break;
+    }
+  }
+}
+
+#pragma mark - BookmarkFolderEditorViewControllerDelegate
+
+- (void)bookmarkFolderEditor:(BookmarkFolderEditorViewController*)folderEditor
+      didFinishEditingFolder:(const BookmarkNode*)folder {
+  DCHECK(folder);
+  [self reloadFolders];
+  [self changeSelectedFolder:folder];
+  [self delayedNotifyDelegateOfSelection];
+}
+
+- (void)bookmarkFolderEditorDidDeleteEditedFolder:
+    (BookmarkFolderEditorViewController*)folderEditor {
+  NOTREACHED();
+}
+
+- (void)bookmarkFolderEditorDidCancel:
+    (BookmarkFolderEditorViewController*)folderEditor {
+  [self.navigationController popViewControllerAnimated:YES];
+  self.folderAddController.delegate = nil;
+  self.folderAddController = nil;
+}
+
+#pragma mark - BookmarkModelBridgeObserver
+
+- (void)bookmarkModelLoaded {
+  // The bookmark model is assumed to be loaded when this controller is created.
+  NOTREACHED();
+}
+
+- (void)bookmarkNodeChanged:(const BookmarkNode*)bookmarkNode {
+  if (!bookmarkNode->is_folder())
+    return;
+  [self reloadFolders];
+}
+
+- (void)bookmarkNodeChildrenChanged:(const BookmarkNode*)bookmarkNode {
+  [self reloadFolders];
+}
+
+- (void)bookmarkNode:(const BookmarkNode*)bookmarkNode
+     movedFromParent:(const BookmarkNode*)oldParent
+            toParent:(const BookmarkNode*)newParent {
+  if (bookmarkNode->is_folder()) {
+    [self reloadFolders];
+  }
+}
+
+- (void)bookmarkNodeDeleted:(const BookmarkNode*)bookmarkNode
+                 fromFolder:(const BookmarkNode*)folder {
+  if (!bookmarkNode->is_folder())
+    return;
+
+  if (bookmarkNode == self.selectedFolder) {
+    // The selected folder has been deleted. Fallback on the Mobile Bookmarks
+    // node.
+    [self changeSelectedFolder:self.bookmarkModel->mobile_node()];
+  }
+  [self reloadFolders];
+}
+
+- (void)bookmarkModelRemovedAllNodes {
+  // The selected folder is no longer valid. Fallback on the Mobile Bookmarks
+  // node.
+  [self changeSelectedFolder:self.bookmarkModel->mobile_node()];
+  [self reloadFolders];
+}
+
+#pragma mark - Actions
+
+- (void)done:(id)sender {
+  [self.delegate folderPicker:self didFinishWithFolder:self.selectedFolder];
+}
+
+- (void)cancel:(id)sender {
+  [self.delegate folderPickerDidCancel:self];
+}
+
+- (void)back:(id)sender {
+  [self.delegate folderPickerDidCancel:self];
+}
+
+#pragma mark - Private
+
+- (BOOL)shouldShowDefaultSection {
+  return self.allowsNewFolders;
+}
+
+- (BookmarkFolderTableViewCell*)defaultSectionCellForRow:(NSInteger)row {
+  DCHECK([self shouldShowDefaultSection]);
+  DCHECK_EQ(0, row);
+  BookmarkFolderTableViewCell* cell = [self.tableView
+      dequeueReusableCellWithIdentifier:[BookmarkFolderTableViewCell
+                                            folderCreationCellReuseIdentifier]];
+  if (!cell) {
+    cell = [BookmarkFolderTableViewCell folderCreationCell];
+  }
+  return cell;
+}
+
+- (BookmarkFolderTableViewCell*)folderSectionCellForRow:(NSInteger)row {
+  DCHECK(row <
+         [self.tableView numberOfRowsInSection:BookmarkFolderSectionFolders]);
+  BookmarkFolderTableViewCell* cell = [self.tableView
+      dequeueReusableCellWithIdentifier:[BookmarkFolderTableViewCell
+                                            folderCellReuseIdentifier]];
+  if (!cell) {
+    cell = [BookmarkFolderTableViewCell folderCell];
+  }
+  const BookmarkNode* folder = self.folders[row];
+  NSString* title = bookmark_utils_ios::TitleForBookmarkNode(folder);
+  cell.textLabel.text = title;
+  cell.accessibilityIdentifier = title;
+  cell.accessibilityLabel = title;
+  cell.checked = (self.selectedFolder == folder);
+
+  // Indentation level.
+  NSInteger level = 0;
+  const BookmarkNode* node = folder;
+  while (node && !(self.bookmarkModel->is_root_node(node))) {
+    ++level;
+    node = node->parent();
+  }
+  // The root node is not shown as a folder, so top level folders have a
+  // level strictly positive.
+  DCHECK(level > 0);
+  cell.indentationLevel = level - 1;
+
+  return cell;
+}
+
+- (void)reloadFolders {
+  _folders = bookmark_utils_ios::VisibleNonDescendantNodes(self.editedNodes,
+                                                           self.bookmarkModel);
+  [self.tableView reloadData];
+}
+
+- (void)pushFolderAddViewController {
+  DCHECK(self.allowsNewFolders);
+  BookmarkFolderEditorViewController* folderCreator =
+      [BookmarkFolderEditorViewController
+          folderCreatorWithBookmarkModel:self.bookmarkModel
+                            parentFolder:self.selectedFolder];
+  folderCreator.delegate = self;
+  [self.navigationController pushViewController:folderCreator animated:YES];
+  self.folderAddController = folderCreator;
+}
+
+- (void)delayedNotifyDelegateOfSelection {
+  self.view.userInteractionEnabled = NO;
+  base::WeakNSObject<BookmarkFolderViewController> weakSelf(self);
+  dispatch_after(
+      dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)),
+      dispatch_get_main_queue(), ^{
+        base::scoped_nsobject<BookmarkFolderViewController> strongSelf(
+            [weakSelf retain]);
+        // Early return if the controller has been deallocated.
+        if (!strongSelf)
+          return;
+        strongSelf.get().view.userInteractionEnabled = YES;
+        [strongSelf done:nil];
+      });
+}
+
+@end