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
  18     : public AXTreeSource<const AXNode*, AXNodeData> {
  19  public:
  20   AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {}
  21   ~AXTreeSourceAdapter() override {}
  22
  23   // AXTreeSource implementation.
  24   AXNode* GetRoot() const override { return tree_->root(); }
  25
  26   AXNode* GetFromId(int32 id) const override { return tree_->GetFromId(id); }
  27
  28   int32 GetId(const AXNode* node) const override { return node->id(); }
  29
  30   void GetChildren(const AXNode* node,
  31                    std::vector<const AXNode*>* out_children) const override {
  32     for (int i = 0; i < node->child_count(); ++i)
  33       out_children->push_back(node->ChildAtIndex(i));
  34   }
  35
  36   AXNode* GetParent(const AXNode* node) const override {
  37     return node->parent();
  38   }
  39
  40   bool IsValid(const AXNode* node) const override { return node != NULL; }
  41
  42   bool IsEqual(const AXNode* node1, const AXNode* node2) const override {
  43     return node1 == node2;
  44   }
  45
  46   const AXNode* GetNull() const override { return NULL; }
  47
  48   void SerializeNode(const AXNode* node, AXNodeData* out_data) const override {
  49     *out_data = node->data();
  50   }
  51
  52  private:
  53   AXTree* tree_;
  54 };
  55
  56 AXSerializableTree::AXSerializableTree()
  57     : AXTree() {}
  58
  59 AXSerializableTree::AXSerializableTree(
  60     const AXTreeUpdate<AXNodeData>& initial_state)
  61     : AXTree(initial_state) {
  62 }
  63
  64 AXSerializableTree::~AXSerializableTree() {
  65 }
  66
  67 AXTreeSource<const AXNode*, AXNodeData>*
  68 AXSerializableTree::CreateTreeSource() {
  69   return new AXTreeSourceAdapter(this);
  70 }
  71
  72 }  // namespace ui