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 <stdint.h>
8
9 #include "ui/accessibility/ax_node.h"
10
11 namespace ui {
12
13 // This class is an implementation of the AXTreeSource interface with
14 // AXNode as the node type, that just delegates to an AXTree. The purpose
15 // of this is so that AXTreeSerializer only needs to work with the
16 // AXTreeSource abstraction and doesn't need to actually know about
17 // AXTree directly. Another AXTreeSource is used to abstract the Blink
18 // accessibility tree.
19 class AX_EXPORT AXTreeSourceAdapter
20 : public AXTreeSource<const AXNode*, AXNodeData, AXTreeData> {
21 public:
AXTreeSourceAdapter(AXTree * tree)22 AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {}
~AXTreeSourceAdapter()23 ~AXTreeSourceAdapter() override {}
24
25 // AXTreeSource implementation.
GetTreeData(AXTreeData * data) const26 bool GetTreeData(AXTreeData* data) const override {
27 *data = tree_->data();
28 return true;
29 }
30
GetRoot() const31 AXNode* GetRoot() const override { return tree_->root(); }
32
GetFromId(int32_t id) const33 AXNode* GetFromId(int32_t id) const override { return tree_->GetFromId(id); }
34
GetId(const AXNode * node) const35 int32_t GetId(const AXNode* node) const override { return node->id(); }
36
GetChildren(const AXNode * node,std::vector<const AXNode * > * out_children) const37 void GetChildren(const AXNode* node,
38 std::vector<const AXNode*>* out_children) const override {
39 *out_children = std::vector<const AXNode*>(node->children().cbegin(),
40 node->children().cend());
41 }
42
GetParent(const AXNode * node) const43 AXNode* GetParent(const AXNode* node) const override {
44 return node->parent();
45 }
46
IsIgnored(const AXNode * node) const47 bool IsIgnored(const AXNode* node) const override {
48 return node->IsIgnored();
49 }
50
IsValid(const AXNode * node) const51 bool IsValid(const AXNode* node) const override { return node != nullptr; }
52
IsEqual(const AXNode * node1,const AXNode * node2) const53 bool IsEqual(const AXNode* node1, const AXNode* node2) const override {
54 return node1 == node2;
55 }
56
GetNull() const57 const AXNode* GetNull() const override { return nullptr; }
58
SerializeNode(const AXNode * node,AXNodeData * out_data) const59 void SerializeNode(const AXNode* node, AXNodeData* out_data) const override {
60 *out_data = node->data();
61 }
62
63 private:
64 AXTree* tree_;
65 };
66
AXSerializableTree()67 AXSerializableTree::AXSerializableTree()
68 : AXTree() {}
69
AXSerializableTree(const AXTreeUpdate & initial_state)70 AXSerializableTree::AXSerializableTree(
71 const AXTreeUpdate& initial_state)
72 : AXTree(initial_state) {
73 }
74
~AXSerializableTree()75 AXSerializableTree::~AXSerializableTree() {
76 }
77
78 AXTreeSource<const AXNode*, AXNodeData, AXTreeData>*
CreateTreeSource()79 AXSerializableTree::CreateTreeSource() {
80 return new AXTreeSourceAdapter(this);
81 }
82
83 } // namespace ui
84