// Copyright 2024 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_PLATFORM_NODE_ID_H_ #define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_ID_H_ #include <stdint.h> #include "base/types/pass_key.h" #include "base/types/strong_alias.h" namespace ui { class AXNodeIdDelegate; // The underlying type of a uniquely-generated accessibility node identifier for // use with the platform. The actual id store can only a accommodate 32 bit // integers on Windows, because IAccessible2 uses LONG for get_uniqueID() and // for event target ids. In addition, the signed values have special meaning, so // the id must be between 1 and 2^31-1. // // These ids must not be conflated with the int id or AXNodeId, that comes with // web node data, which are only unique within their source frame. // // Instances may only be created by AXUniqueId. Take care when storing an // instance, as its value is not guaranteed to be unique once the AXUniqueId // from whence it came is destroyed. // // Instances are implicitly convertible to (but not from) the platform's node // identifier type so that they may be used directly when calling the // platform's accessibility APIs. class AXPlatformNodeId : public base::StrongAlias<class AXPlatformNodeIdTag, int32_t> { … }; } // namespace ui #endif // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_ID_H_