a11y: Exclude children of nested keyboard accessible controls from a11y tree.

ui/accessibility/platform/ax_platform_node_delegate.h

 // 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.
 
 #ifndef UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_
 #define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_
 
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_export.h"
 #include "ui/gfx/geometry/vector2d.h"
@@ skipping 24 matching lines @@
   // is mostly to implement support for walking the accessibility tree.
   virtual const AXNodeData& GetData() = 0;
 
   // Get the window the node is contained in.
   virtual gfx::NativeWindow GetTopLevelWidget() = 0;
 
   // Get the parent of the node, which may be an AXPlatformNode or it may
   // be a native accessible object implemented by another class.
   virtual gfx::NativeViewAccessible GetParent() = 0;
 
-  // Get the number of children of this node.
+  // Get the number of children of this node, excluding ignored children.
   virtual int GetChildCount() = 0;
 
-  // Get the child of a node given a 0-based index.
+  // Get the child of a node given a 0-based index, excluding ignored children.
   virtual gfx::NativeViewAccessible ChildAtIndex(int index) = 0;
 
   // Get the offset to convert local coordinates to screen global coordinates.
   virtual gfx::Vector2d GetGlobalCoordinateOffset() = 0;
 
   // Do a *synchronous* hit test of the given location in global screen
   // coordinates, and the node within this node's subtree (inclusive) that's
   // hit, if any.
   //
   // If the result is anything other than this object or NULL, it will be
   // hit tested again recursively - that allows hit testing to work across
   // implementation classes. It's okay to take advantage of this and return
   // only an immediate child and not the deepest descendant.
   //
   // This function is mainly used by accessibility debugging software.
   // Platforms with touch accessibility use a different asynchronous interface.
   virtual gfx::NativeViewAccessible HitTestSync(int x, int y) = 0;
 
   // Return the node within this node's subtree (inclusive) that currently
   // has focus.
   virtual gfx::NativeViewAccessible GetFocus() = 0;
 
+  // Whether this element should be ignored by the accessibility client.
+  virtual bool IsIgnored() = 0;
+
   //
   // Events.
   //
 
   // Return the platform-native GUI object that should be used as a target
   // for accessibility events.
   virtual gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() = 0;
 
   //
   // Actions.
   //
 
   // Perform the default action, e.g. click a button, follow a link, or
   // toggle a checkbox.
   virtual void DoDefaultAction() = 0;
 
   // Change the value of a control, such as the text content of a text field.
   virtual bool SetStringValue(const base::string16& new_value) = 0;
 
   // Whether the string value is settable.
   virtual bool CanSetStringValue() = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_