ids.h revision f8ee788a64d60abd8f2d742a5fdedde054ecd910 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef MOJO_SERVICES_VIEW_MANAGER_IDS_H_
6#define MOJO_SERVICES_VIEW_MANAGER_IDS_H_
7
8#include "mojo/services/public/cpp/view_manager/types.h"
9#include "mojo/services/public/cpp/view_manager/util.h"
10#include "mojo/services/view_manager/view_manager_export.h"
11
12namespace mojo {
13namespace view_manager {
14namespace service {
15
16// Connection id reserved for the root.
17const ConnectionSpecificId kRootConnection = 0;
18
19// TODO(sky): remove this, temporary while window manager API is in existing
20// api.
21const ConnectionSpecificId kWindowManagerConnection = 1;
22
23// Adds a bit of type safety to node ids.
24struct MOJO_VIEW_MANAGER_EXPORT NodeId {
25  NodeId(ConnectionSpecificId connection_id, ConnectionSpecificId node_id)
26      : connection_id(connection_id),
27        node_id(node_id) {}
28  NodeId() : connection_id(0), node_id(0) {}
29
30  bool operator==(const NodeId& other) const {
31    return other.connection_id == connection_id &&
32        other.node_id == node_id;
33  }
34
35  bool operator!=(const NodeId& other) const {
36    return !(*this == other);
37  }
38
39  ConnectionSpecificId connection_id;
40  ConnectionSpecificId node_id;
41};
42
43// Adds a bit of type safety to view ids.
44struct MOJO_VIEW_MANAGER_EXPORT ViewId {
45  ViewId(ConnectionSpecificId connection_id, ConnectionSpecificId view_id)
46      : connection_id(connection_id),
47        view_id(view_id) {}
48  ViewId() : connection_id(0), view_id(0) {}
49
50  bool operator==(const ViewId& other) const {
51    return other.connection_id == connection_id &&
52        other.view_id == view_id;
53  }
54
55  bool operator!=(const ViewId& other) const {
56    return !(*this == other);
57  }
58
59  ConnectionSpecificId connection_id;
60  ConnectionSpecificId view_id;
61};
62
63// Functions for converting to/from structs and transport values.
64inline NodeId NodeIdFromTransportId(Id id) {
65  return NodeId(HiWord(id), LoWord(id));
66}
67
68inline Id NodeIdToTransportId(const NodeId& id) {
69  return (id.connection_id << 16) | id.node_id;
70}
71
72inline ViewId ViewIdFromTransportId(Id id) {
73  return ViewId(HiWord(id), LoWord(id));
74}
75
76inline Id ViewIdToTransportId(const ViewId& id) {
77  return (id.connection_id << 16) | id.view_id;
78}
79
80inline NodeId RootNodeId() {
81  return NodeId(kRootConnection, 1);
82}
83
84// Returns a NodeId that is reserved to indicate no node. That is, no node will
85// ever be created with this id.
86inline NodeId InvalidNodeId() {
87  return NodeId(kRootConnection, 0);
88}
89
90}  // namespace service
91}  // namespace view_manager
92}  // namespace mojo
93
94#endif  // MOJO_SERVICES_VIEW_MANAGER_IDS_H_
95