1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "ui/accessibility/ax_serializable_tree.h" 6 7 #include "ui/accessibility/ax_node.h" 8 9 namespace ui { 10 11 // This class is an implementation of the AXTreeSource interface with 12 // AXNode as the node type, that just delegates to an AXTree. The purpose 13 // of this is so that AXTreeSerializer only needs to work with the 14 // AXTreeSource abstraction and doesn't need to actually know about 15 // AXTree directly. Another AXTreeSource is used to abstract the Blink 16 // accessibility tree. 17 class AX_EXPORT AXTreeSourceAdapter : public AXTreeSource<AXNode> { 18 public: 19 AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {} 20 virtual ~AXTreeSourceAdapter() {} 21 22 // AXTreeSource implementation. 23 virtual AXNode* GetRoot() const OVERRIDE { 24 return tree_->GetRoot(); 25 } 26 27 virtual AXNode* GetFromId(int32 id) const OVERRIDE { 28 return tree_->GetFromId(id); 29 } 30 31 virtual int32 GetId(const AXNode* node) const OVERRIDE { 32 return node->id(); 33 } 34 35 virtual int GetChildCount(const AXNode* node) const OVERRIDE { 36 return node->child_count(); 37 } 38 39 virtual AXNode* GetChildAtIndex(const AXNode* node, int index) 40 const OVERRIDE { 41 return node->ChildAtIndex(index); 42 } 43 44 virtual AXNode* GetParent(const AXNode* node) const OVERRIDE { 45 return node->parent(); 46 } 47 48 virtual void SerializeNode( 49 const AXNode* node, AXNodeData* out_data) const OVERRIDE { 50 *out_data = node->data(); 51 } 52 53 private: 54 AXTree* tree_; 55 }; 56 57 AXSerializableTree::AXSerializableTree() 58 : AXTree() {} 59 60 AXSerializableTree::AXSerializableTree(const AXTreeUpdate& initial_state) 61 : AXTree(initial_state) { 62 } 63 64 AXSerializableTree::~AXSerializableTree() { 65 } 66 67 AXTreeSource<AXNode>* AXSerializableTree::CreateTreeSource() { 68 return new AXTreeSourceAdapter(this); 69 } 70 71 } // namespace ui 72