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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/accessibility/ax_serializable_tree.h"
#include "ui/accessibility/ax_node.h"
namespace ui {
// This class is an implementation of the AXTreeSource interface with
// AXNode as the node type, that just delegates to an AXTree. The purpose
// of this is so that AXTreeSerializer only needs to work with the
// AXTreeSource abstraction and doesn't need to actually know about
// AXTree directly. Another AXTreeSource is used to abstract the Blink
// accessibility tree.
class AX_EXPORT AXTreeSourceAdapter : public AXTreeSource<const AXNode*> {
public:
AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {}
~AXTreeSourceAdapter() override {}
// AXTreeSource implementation.
AXNode* GetRoot() const override { return tree_->GetRoot(); }
AXNode* GetFromId(int32 id) const override { return tree_->GetFromId(id); }
int32 GetId(const AXNode* node) const override { return node->id(); }
void GetChildren(const AXNode* node,
std::vector<const AXNode*>* out_children) const override {
for (int i = 0; i < node->child_count(); ++i)
out_children->push_back(node->ChildAtIndex(i));
}
AXNode* GetParent(const AXNode* node) const override {
return node->parent();
}
bool IsValid(const AXNode* node) const override { return node != NULL; }
bool IsEqual(const AXNode* node1, const AXNode* node2) const override {
return node1 == node2;
}
const AXNode* GetNull() const override { return NULL; }
void SerializeNode(const AXNode* node, AXNodeData* out_data) const override {
*out_data = node->data();
}
private:
AXTree* tree_;
};
AXSerializableTree::AXSerializableTree()
: AXTree() {}
AXSerializableTree::AXSerializableTree(const AXTreeUpdate& initial_state)
: AXTree(initial_state) {
}
AXSerializableTree::~AXSerializableTree() {
}
AXTreeSource<const AXNode*>* AXSerializableTree::CreateTreeSource() {
return new AXTreeSourceAdapter(this);
}
} // namespace ui
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