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// Copyright 2013 The Chromium Authors
// 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 <stdint.h>
#include "base/memory/raw_ptr.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*, AXTreeData*, AXNodeData> {
public:
explicit AXTreeSourceAdapter(AXTree* tree) : tree_(tree) {}
~AXTreeSourceAdapter() override = default;
// AXTreeSource implementation.
bool GetTreeData(AXTreeData* data) const override {
*data = tree_->data();
return true;
}
AXNode* GetRoot() const override { return tree_->root(); }
AXNode* GetFromId(AXNodeID id) const override { return tree_->GetFromId(id); }
AXNodeID GetId(const AXNode* node) const override { return node->id(); }
void CacheChildrenIfNeeded(const AXNode*) override {}
size_t GetChildCount(const AXNode* node) const override {
return node->children().size();
}
AXNode* ChildAt(const AXNode* node, size_t index) const override {
return node->children()[index];
}
void ClearChildCache(const AXNode*) override {}
AXNode* GetParent(const AXNode* node) const override {
return node->parent();
}
bool IsIgnored(const AXNode* node) const override {
return node->IsIgnored();
}
bool IsEqual(const AXNode* node1, const AXNode* node2) const override {
return node1 == node2;
}
const AXNode* GetNull() const override { return nullptr; }
void SerializeNode(const AXNode* node, AXNodeData* out_data) const override {
*out_data = node->data();
}
private:
raw_ptr<AXTree> tree_;
};
AXSerializableTree::AXSerializableTree()
: AXTree() {}
AXSerializableTree::AXSerializableTree(
const AXTreeUpdate& initial_state)
: AXTree(initial_state) {
}
AXSerializableTree::~AXSerializableTree() {
}
AXTreeSource<const AXNode*, AXTreeData*, AXNodeData>*
AXSerializableTree::CreateTreeSource() {
return new AXTreeSourceAdapter(this);
}
} // namespace ui
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