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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_ACCESSIBILITY_AX_TREE_ID_H_
#define UI_ACCESSIBILITY_AX_TREE_ID_H_
#include <optional>
#include <string>
#include "base/unguessable_token.h"
#include "ui/accessibility/ax_base_export.h"
#include "ui/accessibility/ax_enums.mojom-forward.h"
namespace mojo {
template <typename DataViewType, typename T>
struct UnionTraits;
}
namespace ax::mojom {
class AXTreeIDDataView;
}
namespace ui {
// A unique ID representing an accessibility tree.
class AX_BASE_EXPORT AXTreeID {
public:
// Create an Unknown AXTreeID.
AXTreeID();
// Copy constructor.
AXTreeID(const AXTreeID& other);
// Create a new unique AXTreeID.
static AXTreeID CreateNewAXTreeID();
// Unserialize an AXTreeID from a string. This is used so that tree IDs
// can be stored compactly as a string attribute in an AXNodeData, and
// so that AXTreeIDs can be passed to JavaScript bindings in the
// automation API.
static AXTreeID FromString(const std::string& string);
// Convenience method to unserialize an AXTreeID from an UnguessableToken.
static AXTreeID FromToken(const base::UnguessableToken& token);
AXTreeID& operator=(const AXTreeID& other);
std::string ToString() const;
ax::mojom::AXTreeIDType type() const { return type_; }
const std::optional<base::UnguessableToken>& token() const { return token_; }
friend bool operator==(const AXTreeID&, const AXTreeID&) = default;
friend auto operator<=>(const AXTreeID&, const AXTreeID&) = default;
private:
explicit AXTreeID(ax::mojom::AXTreeIDType type);
explicit AXTreeID(const std::string& string);
friend struct mojo::UnionTraits<ax::mojom::AXTreeIDDataView, AXTreeID>;
friend AX_BASE_EXPORT const AXTreeID& AXTreeIDUnknown();
friend void swap(AXTreeID& first, AXTreeID& second);
ax::mojom::AXTreeIDType type_;
std::optional<base::UnguessableToken> token_ = std::nullopt;
};
// For use in std::unordered_map.
struct AX_BASE_EXPORT AXTreeIDHash {
size_t operator()(const AXTreeID& tree_id) const;
};
AX_BASE_EXPORT std::ostream& operator<<(std::ostream& stream,
const AXTreeID& value);
// The value to use when an AXTreeID is unknown.
AX_BASE_EXPORT const AXTreeID& AXTreeIDUnknown();
} // namespace ui
#endif // UI_ACCESSIBILITY_AX_TREE_ID_H_
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