MacViews: Implement NSAccessibilityPressAction for Views with clickable roles.

ui/accessibility/platform/ax_platform_node_mac.mm

 // 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 "ui/accessibility/platform/ax_platform_node_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_node_data.h"
+#include "ui/accessibility/ax_role_properties.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 #include "ui/base/l10n/l10n_util.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/strings/grit/ui_strings.h"
 
 namespace {
 
 struct RoleMapEntry {
   ui::AXRole value;
   NSString* nativeValue;
@@ skipping 273 matching lines @@
 
 - (BOOL)accessibilityNotifiesWhenDestroyed {
   return YES;
 }
 
 - (id)accessibilityFocusedUIElement {
   return node_->GetDelegate()->GetFocus();
 }
 
 - (NSArray*)accessibilityActionNames {
-  return nil;
+  base::scoped_nsobject<NSMutableArray> axActions(
+      [[NSMutableArray alloc] init]);
+
+  // VoiceOver expects the "press" action to be first.
+  if (ui::IsRoleClickable(node_->GetData().role))
+    [axActions addObject:NSAccessibilityPressAction];
+
+  return axActions.autorelease();
+}
+
+- (void)accessibilityPerformAction:(NSString*)action {
+  DCHECK([[self accessibilityActionNames] containsObject:action]);
+  ui::AXActionData data;
+  if ([action isEqualToString:NSAccessibilityPressAction])
+    data.action = ui::AX_ACTION_DO_DEFAULT;
+
+  // Note ui::AX_ACTIONs which are just overwriting an accessibility attribute
+  // are already implemented in -accessibilitySetValue:forAttribute:, so ignore
+  // those here.
+
+  if (data.action != ui::AX_ACTION_NONE)
+    node_->GetDelegate()->AccessibilityPerformAction(data);
 }
 
 - (NSArray*)accessibilityAttributeNames {
   // These attributes are required on all accessibility objects.
   NSArray* const kAllRoleAttributes = @[
     NSAccessibilityChildrenAttribute,
     NSAccessibilityParentAttribute,
     NSAccessibilityPositionAttribute,
     NSAccessibilityRoleAttribute,
     NSAccessibilitySizeAttribute,
@@ skipping 313 matching lines @@
   }
   NotifyMacEvent(native_node_, event_type);
 }
 
 int AXPlatformNodeMac::GetIndexInParent() {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
   return -1;
 }
 
 }  // namespace ui