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// Copyright 2017 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_PLATFORM_AX_UNIQUE_ID_H_
#define UI_ACCESSIBILITY_PLATFORM_AX_UNIQUE_ID_H_
#include <stdint.h>
#include <limits>
#include <utility>
#include "base/component_export.h"
#include "ui/accessibility/ax_node_id_forward.h"
#include "ui/accessibility/platform/ax_platform_node_id.h"
namespace ui {
// AXUniqueId provides IDs for accessibility objects that are guaranteed to be
// unique for the entire Chrome instance. New values are generated via
// `Create()`, and an instance's value is available for reuse when the instance
// is destroyed. Instances are implicitly convertible to (but not from)
// AXPlatformNodeId.
class COMPONENT_EXPORT(AX_PLATFORM) AXUniqueId final {
public:
static AXUniqueId Create() {
return AXUniqueId(GetNextAXUniqueId(std::numeric_limits<int32_t>::max()));
}
AXUniqueId() = delete;
AXUniqueId(AXUniqueId&& other) noexcept
: id_(std::exchange(other.id_, AXPlatformNodeId())) {}
AXUniqueId& operator=(AXUniqueId&& other) noexcept {
id_ = std::exchange(other.id_, AXPlatformNodeId());
return *this;
}
~AXUniqueId();
AXPlatformNodeId Get() const { return id_; }
constexpr operator const AXPlatformNodeId&() const { return id_; }
friend bool operator==(const AXUniqueId&, const AXUniqueId&) = default;
friend bool operator<=>(const AXUniqueId&, const AXUniqueId&) = default;
static AXUniqueId CreateForTest(int32_t max_id) {
return AXUniqueId(GetNextAXUniqueId(max_id));
}
private:
explicit AXUniqueId(AXPlatformNodeId id) : id_(id) {}
// Returns the next available value given a max of `max_id`.
static AXPlatformNodeId GetNextAXUniqueId(int32_t max_id);
AXPlatformNodeId id_;
};
} // namespace ui
#endif // UI_ACCESSIBILITY_PLATFORM_AX_UNIQUE_ID_H_
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