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      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