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"
#include "ui/gfx/native_widget_types.h"

namespace ui {

struct AXNodeData;
class AXPlatformNode;

class AX_EXPORT AXPlatformNodeDelegate {
 public:
  // Get the accessibility data that should be exposed for this node.
  virtual AXNodeData* GetData() = 0;

  // Get the parent of the node unless it's the root, then it returns NULL.
  virtual gfx::NativeViewAccessible GetParent() = 0;

  // Get the number of children of this node.
  virtual int GetChildCount() = 0;

  // Get the child of a node from [0...GetChildCount() - 1]
  virtual gfx::NativeViewAccessible ChildAtIndex(int index) = 0;

  // Get the offset to convert local coordinates to screen global coordinates.
  virtual gfx::Vector2d GetGlobalCoordinateOffset() = 0;

  //
  // Events.
  //
  virtual void NotifyAccessibilityEvent(ui::AXEvent event_type) = 0;

};

}  // namespace ui

#endif  // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_