MacViews/a11y: Disable most text-specific attributes for protected textfields.

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"
@@ skipping 337 matching lines @@
     NSAccessibilityEnabledAttribute,
     NSAccessibilityFocusedAttribute,
     NSAccessibilityHelpAttribute,
     NSAccessibilityTopLevelUIElementAttribute,
     NSAccessibilityWindowAttribute,
   ];
 
   // Attributes required for user-editable controls.
   NSArray* const kValueAttributes = @[ NSAccessibilityValueAttribute ];
 
-  // Attributes required for textfields.
-  NSArray* const kTextfieldAttributes = @[
+  // Attributes required for unprotected textfields.
+  NSArray* const kUnprotectedTextfieldAttributes = @[
     NSAccessibilityInsertionPointLineNumberAttribute,
     NSAccessibilityNumberOfCharactersAttribute,
-    NSAccessibilityPlaceholderValueAttribute,
     NSAccessibilitySelectedTextAttribute,
     NSAccessibilitySelectedTextRangeAttribute,
     NSAccessibilityVisibleCharacterRangeAttribute,
   ];
 
+  // Required for all textfields, including protected ones.
+  NSString* const kTextfieldAttributes =
+      NSAccessibilityPlaceholderValueAttribute;
+
   base::scoped_nsobject<NSMutableArray> axAttributes(
       [[NSMutableArray alloc] init]);
 
   [axAttributes addObjectsFromArray:kAllRoleAttributes];
   switch (node_->GetData().role) {
     case ui::AX_ROLE_TEXT_FIELD:
-      [axAttributes addObjectsFromArray:kTextfieldAttributes];
+      [axAttributes addObject:kTextfieldAttributes];
+      if (!ui::AXNodeData::IsFlagSet(node_->GetData().state,
+                                     ui::AX_STATE_PROTECTED)) {
+        [axAttributes addObjectsFromArray:kUnprotectedTextfieldAttributes];
+      }
     // Fallthrough.
     case ui::AX_ROLE_CHECK_BOX:
     case ui::AX_ROLE_COMBO_BOX:
     case ui::AX_ROLE_MENU_ITEM_CHECK_BOX:
     case ui::AX_ROLE_MENU_ITEM_RADIO:
     case ui::AX_ROLE_RADIO_BUTTON:
     case ui::AX_ROLE_SEARCH_BOX:
     case ui::AX_ROLE_SLIDER:
     case ui::AX_ROLE_SLIDER_THUMB:
     case ui::AX_ROLE_TOGGLE_BUTTON:
@@ skipping 13 matching lines @@
   // Allow certain attributes to be written via an accessibility client. A
   // writable attribute will only appear as such if the accessibility element
   // has a value set for that attribute.
   if ([attributeName
           isEqualToString:NSAccessibilitySelectedChildrenAttribute] ||
       [attributeName
           isEqualToString:NSAccessibilityVisibleCharacterRangeAttribute]) {
     return NO;
   }
 
-  // Since tabs use the Radio Button role on Mac, the standard way to set them
-  // is via the value attribute rather than the selected attribute.
-  if ([attributeName isEqualToString:NSAccessibilityValueAttribute] &&
-      node_->GetData().role == ui::AX_ROLE_TAB) {
-    return !node_->GetData().HasStateFlag(ui::AX_STATE_SELECTED);
+  if ([attributeName isEqualToString:NSAccessibilityValueAttribute]) {
+    if (node_->GetData().HasStateFlag(ui::AX_STATE_PROTECTED)) {
+      // NSSecureTextField doesn't allow values to be edited (despite showing up
+      // as editable), match its behavior.
+      return NO;
+    }
+    // Since tabs use the Radio Button role on Mac, the standard way to set
+    // them is via the value attribute rather than the selected attribute.
+    else if (node_->GetData().role == ui::AX_ROLE_TAB) {

[tapted, 2017/02/24 05:23:42]

nit: remove "else" (since the prior `if` always returns it has no effect)

[Patti Lor, 2017/02/26 23:16:37]

Done.

+      return !node_->GetData().HasStateFlag(ui::AX_STATE_SELECTED);
+    }
   }
 
   if ([attributeName isEqualToString:NSAccessibilityValueAttribute] ||
       [attributeName isEqualToString:NSAccessibilitySelectedTextAttribute] ||
       [attributeName
           isEqualToString:NSAccessibilitySelectedTextRangeAttribute]) {
     return !ui::AXNodeData::IsFlagSet(node_->GetData().state,
                                       ui::AX_STATE_READ_ONLY);
   }
 
   if ([attributeName isEqualToString:NSAccessibilityFocusedAttribute]) {
     return ui::AXNodeData::IsFlagSet(node_->GetData().state,
                                      ui::AX_STATE_FOCUSABLE);
   }
 
   // TODO(patricialor): Add callbacks for updating the above attributes except
   // NSAccessibilityValueAttribute and return YES.
   return NO;
 }
 
 - (void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute {
   ui::AXActionData data;
 
   // Check for attributes first. Only the |data.action| should be set here - any
   // type-specific information, if needed, should be set below.
-  if ([attribute isEqualToString:NSAccessibilityValueAttribute]) {
+  if ([attribute isEqualToString:NSAccessibilityValueAttribute] &&
+      !node_->GetData().HasStateFlag(ui::AX_STATE_PROTECTED)) {
     data.action = node_->GetData().role == ui::AX_ROLE_TAB
                       ? ui::AX_ACTION_SET_SELECTION
                       : ui::AX_ACTION_SET_VALUE;
   } else if ([attribute isEqualToString:NSAccessibilitySelectedTextAttribute]) {
     data.action = ui::AX_ACTION_REPLACE_SELECTED_TEXT;
   } else if ([attribute
                  isEqualToString:NSAccessibilitySelectedTextRangeAttribute]) {
     data.action = ui::AX_ACTION_SET_SELECTION;
   } else if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
     if ([value isKindOfClass:[NSNumber class]]) {
@@ skipping 127 matching lines @@
   return @(node_->GetData().HasStateFlag(ui::AX_STATE_SELECTED));
 }
 
 - (NSString*)AXPlaceholderValue {
   return [self getStringAttribute:ui::AX_ATTR_PLACEHOLDER];
 }
 
 // Text-specific attributes.
 
 - (NSString*)AXSelectedText {
+  if (ui::AXNodeData::IsFlagSet(node_->GetData().state, ui::AX_STATE_PROTECTED))
+    return nil;
+
   NSRange selectedTextRange;
   [[self AXSelectedTextRange] getValue:&selectedTextRange];
   return [[self AXValue] substringWithRange:selectedTextRange];
 }
 
 - (NSValue*)AXSelectedTextRange {
+  if (ui::AXNodeData::IsFlagSet(node_->GetData().state, ui::AX_STATE_PROTECTED))
+    return nil;
+
   int textDir, start, end;
   node_->GetIntAttribute(ui::AX_ATTR_TEXT_DIRECTION, &textDir);
   node_->GetIntAttribute(ui::AX_ATTR_TEXT_SEL_START, &start);
   node_->GetIntAttribute(ui::AX_ATTR_TEXT_SEL_END, &end);
   // NSRange cannot represent the direction the text was selected in, so make
   // sure the correct selection index is used when creating a new range, taking
   // into account the textfield text direction as well.
   bool isReversed = (textDir == ui::AX_TEXT_DIRECTION_RTL) ||
                     (textDir == ui::AX_TEXT_DIRECTION_BTT);
   int beginSelectionIndex = (end > start && !isReversed) ? start : end;
   return [NSValue valueWithRange:{beginSelectionIndex, abs(end - start)}];
 }
 
 - (NSNumber*)AXNumberOfCharacters {
+  if (ui::AXNodeData::IsFlagSet(node_->GetData().state, ui::AX_STATE_PROTECTED))
+    return nil;
   return @([[self AXValue] length]);
 }
 
 - (NSValue*)AXVisibleCharacterRange {
+  if (ui::AXNodeData::IsFlagSet(node_->GetData().state, ui::AX_STATE_PROTECTED))
+    return nil;
   return [NSValue valueWithRange:{0, [[self AXNumberOfCharacters] intValue]}];
 }
 
 - (NSNumber*)AXInsertionPointLineNumber {
+  if (ui::AXNodeData::IsFlagSet(node_->GetData().state, ui::AX_STATE_PROTECTED))
+    return nil;
   // Multiline is not supported on views.
   return @0;
 }
 
 @end
 
 namespace ui {
 
 // static
 AXPlatformNode* AXPlatformNode::Create(AXPlatformNodeDelegate* delegate) {
@@ skipping 37 matching lines @@
   }
   NotifyMacEvent(native_node_, event_type);
 }
 
 int AXPlatformNodeMac::GetIndexInParent() {
   // TODO(dmazzoni): implement this.  http://crbug.com/396137
   return -1;
 }
 
 }  // namespace ui