[Mac][MC] Initial accessibility pass.

This gives all the buttons appropriate roles, AXTitles, and makes accessible
more of the notification content.

BUG=238248
R=dewittj@chromium.org, dmazzoni@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/17408004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207994 0039d316-1c4b-4281-b951-d872f2087c98

ui/base/strings/ui_strings.grd

@@ -452,6 +452,9 @@ need to be translated for each locale.-->
       <message name="IDS_MESSAGE_CENTER_SETTINGS_BUTTON_LABEL" desc="The button label for visiting the appropriate settings page in the footer of the message center.">
         Settings
       </message>
+      <message name="IDS_MESSAGE_CENTER_SETTINGS_GO_BACK_BUTTON_TOOLTIP" desc="The tooltip on back button that returns from settings to the notification list.">
+        Go back to notifications
+      </message>
       <message name="IDS_MESSAGE_CENTER_SETTINGS_DIALOG_DESCRIPTION" desc="The label to describe the settings dialog.">
         Allow notifications from the following:
       </message>

ui/message_center/cocoa/notification_controller.mm

@@ -9,8 +9,10 @@
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
+#include "grit/ui_strings.h"
 #include "skia/ext/skia_utils_mac.h"
 #import "ui/base/cocoa/hover_image_button.h"
+#include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/text/text_elider.h"
 #include "ui/message_center/message_center.h"
@@ -89,6 +91,8 @@
 }
 @end
 
+////////////////////////////////////////////////////////////////////////////////
+
 @interface MCNotificationView : NSBox {
  @private
   MCNotificationController* controller_;
@@ -113,8 +117,37 @@
   }
   [controller_ notificationClicked];
 }
+
+- (BOOL)accessibilityIsIgnored {
+  return NO;
+}
+
+- (NSArray*)accessibilityActionNames {
+  return @[ NSAccessibilityPressAction ];
+}
+
+- (void)accessibilityPerformAction:(NSString*)action {
+  if ([action isEqualToString:NSAccessibilityPressAction]) {
+    [controller_ notificationClicked];
+    return;
+  }
+  [super accessibilityPerformAction:action];
+}
 @end
 
+////////////////////////////////////////////////////////////////////////////////
+
+@interface AccessibilityIgnoredBox : NSBox
+@end
+
+@implementation AccessibilityIgnoredBox
+- (BOOL)accessibilityIsIgnored {
+  return YES;
+}
+@end
+
+////////////////////////////////////////////////////////////////////////////////
+
 @interface MCNotificationController (Private)
 // Returns a string with item's title in title color and item's message in
 // message color.
@@ -155,6 +188,8 @@
     maxNumberOfLines:(size_t)lines;
 @end
 
+////////////////////////////////////////////////////////////////////////////////
+
 @implementation MCNotificationController
 
 - (id)initWithNotification:(const message_center::Notification*)notification
@@ -252,6 +287,11 @@
     listFrame.origin.y = 0;
     listFrame.size.height = 0;
     listItemView_.reset([[NSView alloc] initWithFrame:listFrame]);
+    [listItemView_ accessibilitySetOverrideValue:NSAccessibilityListRole
+                                    forAttribute:NSAccessibilityRoleAttribute];
+    [listItemView_
+        accessibilitySetOverrideValue:NSAccessibilityContentListSubrole
+                         forAttribute:NSAccessibilitySubroleAttribute];
     CGFloat y = 0;
 
     NSFont* font = [NSFont systemFontOfSize:message_center::kMessageFontSize];
@@ -327,7 +367,7 @@
     separatorFrame.origin = NSMakePoint(0, y);
     separatorFrame.size.height = 1;
     scoped_nsobject<NSBox> separator(
-        [[NSBox alloc] initWithFrame:separatorFrame]);
+        [[AccessibilityIgnoredBox alloc] initWithFrame:separatorFrame]);
     [self configureCustomBox:separator];
     [separator setFillColor:gfx::SkColorToCalibratedNSColor(
         message_center::kButtonSeparatorColor)];
@@ -441,7 +481,8 @@
   NSRect imageFrame = NSMakeRect(0, 0,
        message_center::kNotificationIconSize,
        message_center::kNotificationIconSize);
-  scoped_nsobject<NSBox> imageBox([[NSBox alloc] initWithFrame:imageFrame]);
+  scoped_nsobject<NSBox> imageBox(
+      [[AccessibilityIgnoredBox alloc] initWithFrame:imageFrame]);
   [self configureCustomBox:imageBox];
   [imageBox setFillColor:gfx::SkColorToCalibratedNSColor(
       message_center::kLegacyIconBackgroundColor)];
@@ -473,6 +514,13 @@
   [closeButton_ setAutoresizingMask:NSViewMinYMargin];
   [closeButton_ setTarget:self];
   [closeButton_ setAction:@selector(close:)];
+  [[closeButton_ cell]
+      accessibilitySetOverrideValue:NSAccessibilityCloseButtonSubrole
+                       forAttribute:NSAccessibilitySubroleAttribute];
+  [[closeButton_ cell]
+      accessibilitySetOverrideValue:
+          l10n_util::GetNSString(IDS_APP_ACCNAME_CLOSE)
+                       forAttribute:NSAccessibilityTitleAttribute];
 }
 
 - (void)configureTitleInFrame:(NSRect)rootFrame {

ui/message_center/cocoa/status_item_view.mm

@@ -150,6 +150,19 @@ const CGFloat kUnreadCountMinY = 4;
   }
 }
 
+- (NSArray*)accessibilityActionNames {
+  return @[ NSAccessibilityPressAction ];
+}
+
+- (void)accessibilityPerformAction:(NSString*)action {
+  if ([action isEqualToString:NSAccessibilityPressAction]) {
+    if (callback_)
+      callback_.get()();
+    return;
+  }
+  [super accessibilityPerformAction:action];
+}
+
 // Private /////////////////////////////////////////////////////////////////////
 
 - (BOOL)shouldHighlight {

ui/message_center/cocoa/tray_view_controller.mm

@@ -294,12 +294,16 @@ const CGFloat kTrayBottomMargin = 75;
   [backButton_ setHidden:NO];
   [clearAllButton_ setEnabled:NO];
 
+  [scrollView_ setHidden:YES];
+
   [[[self view] window] recalculateKeyViewLoop];
 
   [self updateTrayViewAndWindow];
 }
 
 - (void)hideSettings:(id)sender {
+  [scrollView_ setHidden:NO];
+
   [[settingsController_ view] removeFromSuperview];
   settingsController_.reset();
 
@@ -413,6 +417,11 @@ const CGFloat kTrayBottomMargin = 75;
   configureButton(backButton_);
   [backButton_ setHidden:YES];
   [backButton_ setKeyEquivalent:@"\e"];
+  [backButton_ setToolTip:l10n_util::GetNSString(
+      IDS_MESSAGE_CENTER_SETTINGS_GO_BACK_BUTTON_TOOLTIP)];
+  [[backButton_ cell]
+      accessibilitySetOverrideValue:[backButton_ toolTip]
+                       forAttribute:NSAccessibilityDescriptionAttribute];
   [[self view] addSubview:backButton_];
 
   // Create the divider line between the control area and the notifications.
@@ -451,6 +460,9 @@ const CGFloat kTrayBottomMargin = 75;
       rb.GetNativeImageNamed(IDR_NOTIFICATION_SETTINGS_PRESSED).ToNSImage()];
   [settingsButton_ setToolTip:
       l10n_util::GetNSString(IDS_MESSAGE_CENTER_SETTINGS_BUTTON_LABEL)];
+  [[settingsButton_ cell]
+      accessibilitySetOverrideValue:[settingsButton_ toolTip]
+                       forAttribute:NSAccessibilityDescriptionAttribute];
   [settingsButton_ setAction:@selector(showSettings:)];
   configureButton(settingsButton_);
   [view addSubview:settingsButton_];
@@ -469,6 +481,9 @@ const CGFloat kTrayBottomMargin = 75;
       rb.GetNativeImageNamed(IDR_NOTIFICATION_CLEAR_ALL_PRESSED).ToNSImage()];
   [clearAllButton_ setToolTip:
       l10n_util::GetNSString(IDS_MESSAGE_CENTER_CLEAR_ALL)];
+  [[clearAllButton_ cell]
+      accessibilitySetOverrideValue:[clearAllButton_ toolTip]
+                       forAttribute:NSAccessibilityDescriptionAttribute];
   [clearAllButton_ setAction:@selector(clearAllNotifications:)];
   configureButton(clearAllButton_);
   [view addSubview:clearAllButton_];
@@ -486,6 +501,9 @@ const CGFloat kTrayBottomMargin = 75;
       rb.GetNativeImageNamed(IDR_NOTIFICATION_PAUSE_PRESSED).ToNSImage()];
   [pauseButton_ setToolTip:
       l10n_util::GetNSString(IDS_MESSAGE_CENTER_QUIET_MODE_BUTTON_TOOLTIP)];
+  [[pauseButton_ cell]
+      accessibilitySetOverrideValue:[pauseButton_ toolTip]
+                       forAttribute:NSAccessibilityDescriptionAttribute];
   [pauseButton_ setAction:@selector(toggleQuietMode:)];
   configureButton(pauseButton_);
   [view addSubview:pauseButton_];