[Payment Request] Picker view + showcase integration + egtests

ios/chrome/browser/payments/payment_request_picker_view_controller.mm

Index: ios/chrome/browser/payments/payment_request_picker_view_controller.mm
diff --git a/ios/chrome/browser/payments/payment_request_picker_view_controller.mm b/ios/chrome/browser/payments/payment_request_picker_view_controller.mm
new file mode 100644
index 0000000000000000000000000000000000000000..77977025349f39b4c428c908d983c7a6afc798a7
--- /dev/null
+++ b/ios/chrome/browser/payments/payment_request_picker_view_controller.mm
@@ -0,0 +1,251 @@
+// Copyright 2017 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/payments/payment_request_picker_view_controller.h"
+
+#import "base/logging.h"
+#import "base/mac/foundation_util.h"
+#import "ios/chrome/browser/payments/payment_request_picker_row.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+NSString* const kPaymentRequestPickerRowAccessibilityID =
+    @"kPaymentRequestPickerRowAccessibilityID";
+NSString* const kPaymentRequestPickerSearchBarAccessibilityID =
+    @"kPaymentRequestPickerSearchBarAccessibilityID";
+
+namespace {
+NSString* const kPaymentRequestPickerViewControllerAccessibilityID =
+    @"kPaymentRequestPickerViewControllerAccessibilityID";
+}  // namespace
+
+@interface PaymentRequestPickerViewController ()<UISearchResultsUpdating>
+
+// Search controller that contains search bar.
+@property(nonatomic, strong) UISearchController* searchController;
+
+// Full data set displayed when tableView is not filtered.
+@property(nonatomic, strong) NSArray<PickerRow*>* allRows;
+
+// Displayed rows in the tableView.
+@property(nonatomic, strong) NSArray<PickerRow*>* displayedRows;
+
+// Selected row.
+@property(nonatomic, strong) PickerRow* selectedRow;
+
+@property(nonatomic, strong)
+    NSDictionary<NSString*, NSArray<PickerRow*>*>* sectionTitleToSectionRowsMap;
+
+@end
+
+@implementation PaymentRequestPickerViewController
+@synthesize searchController = _searchController;
+@synthesize allRows = _allRows;
+@synthesize displayedRows = _displayedRows;
+@synthesize selectedRow = _selectedRow;
+@synthesize sectionTitleToSectionRowsMap = _sectionTitleToSectionRowsMap;
+@synthesize delegate = _delegate;
+
+- (instancetype)initWithRows:(NSArray<PickerRow*>*)rows
+                    selected:(PickerRow*)selectedRow {
+  self = [super initWithStyle:UITableViewStylePlain];
+  if (self) {
+    self.allRows = [rows sortedArrayUsingComparator:^NSComparisonResult(
+                             PickerRow* row1, PickerRow* row2) {
+      return [row1.label localizedCaseInsensitiveCompare:row2.label];
+    }];
+    self.selectedRow = selectedRow;
+    // Default to displaying all the rows.
+    self.displayedRows = self.allRows;
+  }
+  return self;
+}
+
+- (void)setDisplayedRows:(NSArray<PickerRow*>*)displayedRows {
+  _displayedRows = displayedRows;
+
+  // Update the mapping from section titles to rows in that section, for
+  // currently displayed rows.
+  [self updateSectionTitleToSectionRowsMap];
+}
+
+#pragma mark - UIViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  self.tableView.rowHeight = 48.0f;  // The same as MDCCellDefaultOneLineHeight.
+  self.tableView.accessibilityIdentifier =
+      kPaymentRequestPickerViewControllerAccessibilityID;
+
+  self.searchController =
+      [[UISearchController alloc] initWithSearchResultsController:nil];
+  self.searchController.searchResultsUpdater = self;
+  self.searchController.dimsBackgroundDuringPresentation = NO;
+  self.searchController.searchBar.accessibilityIdentifier =
+      kPaymentRequestPickerSearchBarAccessibilityID;
+  self.tableView.tableHeaderView = self.searchController.searchBar;
+
+  // Presentation of searchController will walk up the view controller hierarchy
+  // until it finds the root view controller or one that defines a presentation
+  // context. Make this class the presentation context so that the search
+  // controller does not present on top of the navigation controller.
+  self.definesPresentationContext = YES;
+}
+
+#pragma mark - UITableViewDataSource
+
+- (NSArray<NSString*>*)sectionIndexTitlesForTableView:(UITableView*)tableView {
+  return [self sectionTitles];
+}
+
+- (NSInteger)numberOfSectionsInTableView:(UITableView*)tableView {
+  return [[self sectionTitles] count];
+}
+
+- (NSString*)tableView:(UITableView*)tableView
+    titleForHeaderInSection:(NSInteger)section {
+  return [[self sectionTitles] objectAtIndex:section];
+}
+
+- (NSInteger)tableView:(UITableView*)tableView
+    numberOfRowsInSection:(NSInteger)section {
+  return [[self rowsInSection:section] count];
+}
+
+- (UITableViewCell*)tableView:(UITableView*)tableView
+        cellForRowAtIndexPath:(NSIndexPath*)indexPath {
+  UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
+  if (!cell) {
+    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
+                                  reuseIdentifier:@"cell"];
+    cell.isAccessibilityElement = YES;
+    cell.accessibilityIdentifier = kPaymentRequestPickerRowAccessibilityID;
+  }
+  PickerRow* row =
+      [[self rowsInSection:indexPath.section] objectAtIndex:indexPath.row];
+  cell.textLabel.text = row.label;
+  cell.accessoryType = (row == self.selectedRow)
+                           ? UITableViewCellAccessoryCheckmark
+                           : UITableViewCellAccessoryNone;
+  if (row == self.selectedRow)
+    cell.accessibilityTraits |= UIAccessibilityTraitSelected;
+  else
+    cell.accessibilityTraits &= ~UIAccessibilityTraitSelected;
+
+  return cell;
+}
+
+#pragma mark - UITableViewDelegate
+
+- (void)tableView:(UITableView*)tableView
+    didSelectRowAtIndexPath:(NSIndexPath*)indexPath {
+  if (self.selectedRow) {
+    NSIndexPath* oldSelectedIndexPath = [self indexPathForRow:self.selectedRow];
+    self.selectedRow = nil;
+    // Reload the previously selected row if it is displaying.
+    if (oldSelectedIndexPath) {
+      [self.tableView reloadRowsAtIndexPaths:@[ oldSelectedIndexPath ]
+                            withRowAnimation:UITableViewRowAnimationFade];
+    }
+  }
+
+  self.selectedRow =
+      [[self rowsInSection:indexPath.section] objectAtIndex:indexPath.row];
+  // Reload the newly selected row.
+  [self.tableView reloadRowsAtIndexPaths:@[ indexPath ]
+                        withRowAnimation:UITableViewRowAnimationFade];
+
+  [_delegate paymentRequestPickerViewController:self
+                                   didSelectRow:self.selectedRow];
+}
+
+#pragma mark - UISearchResultsUpdating
+
+- (void)updateSearchResultsForSearchController:
+    (UISearchController*)searchController {
+  NSString* searchText = searchController.searchBar.text;
+
+  // Filter |allRows| for |searchText| and reload the tableView. If |searchText|
+  // is empty, tableView will be loaded with |allRows|.
+  if (searchText.length != 0) {
+    // The search is case-insensitive and ignores diacritics.
+    NSPredicate* predicate =
+        [NSPredicate predicateWithFormat:@"label CONTAINS[cd] %@", searchText];
+    self.displayedRows = [self.allRows filteredArrayUsingPredicate:predicate];
+  } else {
+    self.displayedRows = self.allRows;
+  }
+
+  [self.tableView reloadData];
+}
+
+#pragma mark - Private
+
+// Creates a mapping from section titles to rows in that section, for currently
+// displaying rows, and updates |sectionTitleToSectionRowsMap|.
+- (void)updateSectionTitleToSectionRowsMap {
+  NSMutableDictionary<NSString*, NSArray<PickerRow*>*>*
+      sectionTitleToSectionRowsMap = [[NSMutableDictionary alloc] init];
+
+  for (PickerRow* row in self.displayedRows) {
+    NSString* sectionTitle = [self sectionTitleForRow:row];
+    NSMutableArray<PickerRow*>* sectionRows =
+        base::mac::ObjCCastStrict<NSMutableArray<PickerRow*>>(
+            sectionTitleToSectionRowsMap[sectionTitle]);
+    if (!sectionRows)
+      sectionRows = [[NSMutableArray alloc] init];
+    [sectionRows addObject:row];
+    [sectionTitleToSectionRowsMap setObject:sectionRows forKey:sectionTitle];
+  }
+
+  self.sectionTitleToSectionRowsMap = sectionTitleToSectionRowsMap;
+}
+
+// Returns the indexPath for |row| by calculating its section and its index
+// within the section. Returns nil if the row is not currently displaying.
+- (NSIndexPath*)indexPathForRow:(PickerRow*)row {
+  NSString* sectionTitle = [self sectionTitleForRow:row];
+
+  NSInteger section = [[self sectionTitles] indexOfObject:sectionTitle];
+  if (section == NSNotFound)
+    return nil;
+
+  NSInteger indexInSection =
+      [self.sectionTitleToSectionRowsMap[sectionTitle] indexOfObject:row];
+  if (indexInSection == NSNotFound)
+    return nil;
+
+  return [NSIndexPath indexPathForRow:indexInSection inSection:section];
+}
+
+// Returns the titles for the displayed sections in the tableView.
+- (NSArray<NSString*>*)sectionTitles {
+  return [[self.sectionTitleToSectionRowsMap allKeys]
+      sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
+}
+
+// Returns the displayed rows in the given section.
+- (NSArray<PickerRow*>*)rowsInSection:(NSInteger)section {
+  NSArray<NSString*>* sectionTitles = [self sectionTitles];
+  DCHECK(section >= 0 && section < static_cast<NSInteger>(sectionTitles.count));
+
+  NSString* sectionTitle = [sectionTitles objectAtIndex:section];
+
+  return self.sectionTitleToSectionRowsMap[sectionTitle];
+}
+
+// Returns the title for the section the given row gets added to. The section
+// title for a row is the capitalized first letter of the label for that row.
+- (NSString*)sectionTitleForRow:(PickerRow*)row {
+  return [[row.label substringToIndex:1] uppercaseString];
+}
+
+- (NSString*)description {
+  return kPaymentRequestPickerViewControllerAccessibilityID;
+}
+
+@end