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// Copyright 2013 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.
#include "ui/accessibility/ax_serializable_tree.h"
#include "ui/accessibility/ax_node.h"
namespace ui {
// This class is an implementation of the AXTreeSource interface with
// AXNode as the node type, that just delegates to an AXTree. The purpose
// of this is so that AXTreeSerializer only needs to work with the
// AXTreeSource abstraction and doesn't need to actually know about
// AXTree directly. Another AXTreeSource is used to abstract the Blink
// accessibility tree.
class AX_EXPORT AXTreeSourceAdapter : public AXTreeSource<AXNode> {
AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {}
virtual ~AXTreeSourceAdapter() {}
// AXTreeSource implementation.
virtual AXNode* GetFromId(int32 id) const OVERRIDE {
return tree_->GetFromId(id);
virtual int32 GetId(const AXNode* node) const OVERRIDE {
return node->id();
virtual int GetChildCount(const AXNode* node) const OVERRIDE {
return node->child_count();
virtual AXNode* GetChildAtIndex(const AXNode* node, int index)
const OVERRIDE {
return node->ChildAtIndex(index);
virtual int32 GetParentId(const AXNode* node) const OVERRIDE {
if (node->parent())
return node->parent()->id();
return 0;
virtual void SerializeNode(
const AXNode* node, AXNodeData* out_data) const OVERRIDE {
*out_data = node->data();
AXTree* tree_;
: AXTree() {}
AXSerializableTree::AXSerializableTree(const AXTreeUpdate& initial_state)
: AXTree(initial_state) {
AXSerializableTree::~AXSerializableTree() {
AXTreeSource<AXNode>* AXSerializableTree::CreateTreeSource() {
return new AXTreeSourceAdapter(this);
} // namespace ui