Add context menu items to password details settings view

This adds the Copy context menu item to the cells with site, username and
password, and also the Show/Hide item for password (whether it's Show or Hide
depends on whether the password is masked or unmasked, respectively).

Screenshots are at https://crbug.com/717968#c3.

BUG=717968

Change-Id: Iaeec460deea8c117179a8469eb771e9802765012
Reviewed-on: https://chromium-review.googlesource.com/563695
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Reviewed-by: Louis Romero <lpromero@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485252}

ios/chrome/app/strings/ios_strings.grd

@@ -1122,12 +1122,21 @@ Handoff must also be enabled in the General section of Settings, and your device
       <message name="IDS_IOS_SETTINGS_SITE_COPY_BUTTON" desc="Button that the user can press to copy the site to clipboard. [Length: 12em]">
         Copy
       </message>
+      <message name="IDS_IOS_SETTINGS_SITE_COPY_MENU_ITEM" desc="Context menu item available on the cell showing the site/URL with a passwords origin, in the detailed view of a stored credential. The user can select it to copy the site to clipboard. [Length: should be one short word, is under 5em in English]">
+        Copy
+      </message>
       <message name="IDS_IOS_SETTINGS_USERNAME_COPY_BUTTON" desc="Button that the user can press to copy the username to clipboard. [Length: 12em]">
         Copy
       </message>
+      <message name="IDS_IOS_SETTINGS_USERNAME_COPY_MENU_ITEM" desc="Context menu item available on the username cell in the detailed view of a stored credential. The user can select it to copy the username to clipboard. [Length: should be one short word, is under 5em in English]">
+        Copy
+      </message>
       <message name="IDS_IOS_SETTINGS_PASSWORD_COPY_BUTTON" desc="Button that the user can press to copy the password to clipboard. [Length: 12em]">
         Copy
       </message>
+      <message name="IDS_IOS_SETTINGS_PASSWORD_COPY_MENU_ITEM" desc="Context menu item available on the password cell in detailed view of a stored credential. The user can select it to copy the password to clipboard. [Length: should be one short word, is under 5em in English]">
+        Copy
+      </message>
       <message name="IDS_IOS_SETTINGS_PASSWORD_DELETE_BUTTON" desc="Button that the user can press to delete the saved password. [Length: 31em]">
         Delete Saved Password
       </message>
@@ -1137,6 +1146,9 @@ Handoff must also be enabled in the General section of Settings, and your device
       <message name="IDS_IOS_SETTINGS_PASSWORD_HIDE_BUTTON" desc="Button that the user can press to change the way the password is displayed from plain text to obscured form (i.e. from plain text to dots). [Length: 12em]">
         Hide
       </message>
+      <message name="IDS_IOS_SETTINGS_PASSWORD_HIDE_MENU_ITEM" desc="Context menu item available on the password cell in detailed view of a stored password. The user can select it to hide the password to clipboard. [Length: should be one short word, is under 5em in English]">
+        Hide
+      </message>
       <message name="IDS_IOS_SETTINGS_PASSWORD_REAUTH_REASON_COPY" desc="Message explaining that the reason why we are requiring the user to re-authenticate is to be able to copy the password. This is shown by iOS in the Touch ID reauthentication system dialogue, right under the OS string 'Touch ID for $BROWSER_NAME'. [Length: 22em]">
         Copy password
       </message>
@@ -1146,6 +1158,9 @@ Handoff must also be enabled in the General section of Settings, and your device
       <message name="IDS_IOS_SETTINGS_PASSWORD_SHOW_BUTTON" desc="Button that the user can press in order to have the password displayed in plain text. [Length: 12em]">
         Show
       </message>
+      <message name="IDS_IOS_SETTINGS_PASSWORD_SHOW_MENU_ITEM" desc="Context menu item available on the password cell in detailed view of a stored password. The user can select it to show the password to clipboard. [Length: should be one short word, is under 5em in English]">
+        Show
+      </message>
       <message name="IDS_IOS_SETTINGS_SITE_WAS_COPIED_MESSAGE" desc="Confirmation that the site URL of a saved credential was copied. This is shown alone in an infobar at the bottom of the screen. [Length: 40em]">
         The site URL was copied.
       </message>

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

@@ -56,7 +56,18 @@ typedef NS_ENUM(NSInteger, ItemType) {
 
 }  // namespace
 
-@interface PasswordDetailsCollectionViewController () {
+// This protocol declares the methods used by the context menus, so that
+// selectors can be created from those methods and passed to UIMenuItem.
+@protocol PasswordDetailsViewerProtocol<NSObject>
+- (void)copySite;
+- (void)copyUsername;
+- (void)copyPassword;
+- (void)showPassword;
+- (void)hidePassword;
+@end
+
+@interface PasswordDetailsCollectionViewController ()<
+    PasswordDetailsViewerProtocol> {
   // The username to which the saved password belongs.
   NSString* _username;
   // The saved password.
@@ -446,6 +457,74 @@ reauthenticationModule:(id<ReauthenticationProtocol>)reauthenticationModule {
   [self presentViewController:_deleteConfirmation animated:YES completion:nil];
 }
 
+// Returns an array of UIMenuItems to display in a context menu on the site
+// cell.
+- (NSArray*)getSiteMenuItems {
+  UIMenuItem* copyOption = [[UIMenuItem alloc]
+      initWithTitle:l10n_util::GetNSString(IDS_IOS_SETTINGS_SITE_COPY_MENU_ITEM)
+             action:@selector(copySite)];
+  return @[ copyOption ];
+}
+
+// Returns an array of UIMenuItems to display in a context menu on the username
+// cell.
+- (NSArray*)getUsernameMenuItems {
+  UIMenuItem* copyOption = [[UIMenuItem alloc]
+      initWithTitle:l10n_util::GetNSString(
+                        IDS_IOS_SETTINGS_USERNAME_COPY_MENU_ITEM)
+             action:@selector(copyUsername)];
+  return @[ copyOption ];
+}
+
+// Returns an array of UIMenuItems to display in a context menu on the password
+// cell.
+- (NSArray*)getPasswordMenuItems {
+  UIMenuItem* copyOption = [[UIMenuItem alloc]
+      initWithTitle:l10n_util::GetNSString(
+                        IDS_IOS_SETTINGS_PASSWORD_COPY_MENU_ITEM)
+             action:@selector(copyPassword)];
+  UIMenuItem* showOption = [[UIMenuItem alloc]
+      initWithTitle:l10n_util::GetNSString(
+                        IDS_IOS_SETTINGS_PASSWORD_SHOW_MENU_ITEM)
+             action:@selector(showPassword)];
+  UIMenuItem* hideOption = [[UIMenuItem alloc]
+      initWithTitle:l10n_util::GetNSString(
+                        IDS_IOS_SETTINGS_PASSWORD_HIDE_MENU_ITEM)
+             action:@selector(hidePassword)];
+  return @[ copyOption, showOption, hideOption ];
+}
+
+// If the context menu is not shown for a given item type, constructs that
+// menu and shows it. This method should only be called for item types
+// representing the cells with the site, username and password.
+- (void)ensureContextMenuShownForItemType:(NSInteger)itemType
+                           collectionView:(UICollectionView*)collectionView
+                              atIndexPath:(NSIndexPath*)indexPath {
+  UIMenuController* menu = [UIMenuController sharedMenuController];
+  if (![menu isMenuVisible]) {
+    NSArray* options = nil;
+    switch (itemType) {
+      case ItemTypeSite:
+        options = [self getSiteMenuItems];
+        break;
+      case ItemTypeUsername:
+        options = [self getUsernameMenuItems];
+        break;
+      case ItemTypePassword:
+        options = [self getPasswordMenuItems];
+        break;
+      default:
+        NOTREACHED();
+    }
+    [menu setMenuItems:options];
+    UICollectionViewLayoutAttributes* attributes =
+        [collectionView.collectionViewLayout
+            layoutAttributesForItemAtIndexPath:indexPath];
+    [menu setTargetRect:attributes.frame inView:collectionView];
+    [menu setMenuVisible:YES animated:YES];
+  }
+}
+
 #pragma mark - UICollectionViewDelegate
 
 - (void)collectionView:(UICollectionView*)collectionView
@@ -454,6 +533,13 @@ reauthenticationModule:(id<ReauthenticationProtocol>)reauthenticationModule {
   NSInteger itemType =
       [self.collectionViewModel itemTypeForIndexPath:indexPath];
   switch (itemType) {
+    case ItemTypeSite:
+    case ItemTypeUsername:
+    case ItemTypePassword:
+      [self ensureContextMenuShownForItemType:itemType
+                               collectionView:collectionView
+                                  atIndexPath:indexPath];
+      break;
     case ItemTypeCopySite:
       [self copySite];
       break;
@@ -502,4 +588,20 @@ reauthenticationModule:(id<ReauthenticationProtocol>)reauthenticationModule {
   _weakReauthenticationModule = reauthenticationModule;
 }
 
+#pragma mark - UIResponder
+
+- (BOOL)canBecomeFirstResponder {
+  return YES;
+}
+
+- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
+  if (action == @selector(copySite) || action == @selector(copyUsername) ||
+      action == @selector(copyPassword) ||
+      (_plainTextPasswordShown && action == @selector(hidePassword)) ||
+      (!_plainTextPasswordShown && action == @selector(showPassword))) {
+    return YES;
+  }
+  return NO;
+}
+
 @end