Move mus to //services/ui

components/mus/ws/ids.h

-// Copyright 2014 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.
-
-#ifndef COMPONENTS_MUS_WS_IDS_H_
-#define COMPONENTS_MUS_WS_IDS_H_
-
-#include <stdint.h>
-
-#include <tuple>
-
-#include "base/containers/hash_tables.h"
-#include "base/hash.h"
-#include "components/mus/common/types.h"
-#include "components/mus/common/util.h"
-
-namespace mus {
-namespace ws {
-
-// A client id used to indicate no client. That is, no WindowTree ever gets this
-// id.
-const ClientSpecificId kInvalidClientId = 0;
-
-// Every window has a unique id associated with it (WindowId). The id is a
-// combination of the id assigned to the client (the high order bits) and
-// a unique id for the window. Each client (WindowTree) refers to the window
-// by an id assigned by the client (ClientWindowId). To facilitate this
-// WindowTree maintains a mapping between WindowId and ClientWindowId.
-//
-// This model works when the client initiates creation of windows, which is
-// the typical use case. Embed roots and the WindowManager are special, they
-// get access to windows created by other clients. These clients see the
-// id assigned on the server. Such clients have to take care that they only
-// create windows using their client id. To do otherwise could result in
-// multiple windows having the same ClientWindowId. WindowTree enforces
-// that embed roots use the client id in creating the window id to avoid
-// possible conflicts.
-struct WindowId {
-  WindowId(ClientSpecificId client_id, ClientSpecificId window_id)
-      : client_id(client_id), window_id(window_id) {}
-  WindowId() : client_id(0), window_id(0) {}
-
-  bool operator==(const WindowId& other) const {
-    return other.client_id == client_id && other.window_id == window_id;
-  }
-
-  bool operator!=(const WindowId& other) const { return !(*this == other); }
-
-  bool operator<(const WindowId& other) const {
-    return std::tie(client_id, window_id) <
-           std::tie(other.client_id, other.window_id);
-  }
-
-  ClientSpecificId client_id;
-  ClientSpecificId window_id;
-};
-
-// Used for ids assigned by the client.
-struct ClientWindowId {
-  explicit ClientWindowId(Id id) : id(id) {}
-  ClientWindowId() : id(0u) {}
-
-  bool operator==(const ClientWindowId& other) const { return other.id == id; }
-
-  bool operator!=(const ClientWindowId& other) const {
-    return !(*this == other);
-  }
-
-  bool operator<(const ClientWindowId& other) const { return id < other.id; }
-
-  Id id;
-};
-
-inline WindowId WindowIdFromTransportId(Id id) {
-  return WindowId(HiWord(id), LoWord(id));
-}
-inline Id WindowIdToTransportId(const WindowId& id) {
-  return (id.client_id << 16) | id.window_id;
-}
-
-// Returns a WindowId that is reserved to indicate no window. That is, no window
-// will ever be created with this id.
-inline WindowId InvalidWindowId() {
-  return WindowId(kInvalidClientId, 0);
-}
-
-// Returns a root window id with a given index offset.
-inline WindowId RootWindowId(uint16_t index) {
-  return WindowId(kInvalidClientId, 2 + index);
-}
-
-}  // namespace ws
-}  // namespace mus
-
-namespace BASE_HASH_NAMESPACE {
-
-template <>
-struct hash<mus::ws::ClientWindowId> {
-  size_t operator()(const mus::ws::ClientWindowId& id) const {
-    return hash<mus::Id>()(id.id);
-  }
-};
-
-template <>
-struct hash<mus::ws::WindowId> {
-  size_t operator()(const mus::ws::WindowId& id) const {
-    return hash<mus::Id>()(WindowIdToTransportId(id));
-  }
-};
-
-}  // namespace BASE_HASH_NAMESPACE
-
-#endif  // COMPONENTS_MUS_WS_IDS_H_