ui/accessibility/ax_serializable_tree.cc

   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