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
12 namespace mojo {
13 namespace view_manager {
14 namespace service {
15
16 // Connection id reserved for the root.
17 const ConnectionSpecificId kRootConnection = 0;
18
19 // TODO(sky): remove this, temporary while window manager API is in existing
20 // api.
21 const ConnectionSpecificId kWindowManagerConnection = 1;
22
23 // Adds a bit of type safety to node ids.
24 struct MOJO_VIEW_MANAGER_EXPORT NodeId {
NodeIdNodeId25 NodeId(ConnectionSpecificId connection_id, ConnectionSpecificId node_id)
26 : connection_id(connection_id),
27 node_id(node_id) {}
NodeIdNodeId28 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.
44 struct MOJO_VIEW_MANAGER_EXPORT ViewId {
ViewIdViewId45 ViewId(ConnectionSpecificId connection_id, ConnectionSpecificId view_id)
46 : connection_id(connection_id),
47 view_id(view_id) {}
ViewIdViewId48 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.
NodeIdFromTransportId(Id id)64 inline NodeId NodeIdFromTransportId(Id id) {
65 return NodeId(HiWord(id), LoWord(id));
66 }
67
NodeIdToTransportId(const NodeId & id)68 inline Id NodeIdToTransportId(const NodeId& id) {
69 return (id.connection_id << 16) | id.node_id;
70 }
71
ViewIdFromTransportId(Id id)72 inline ViewId ViewIdFromTransportId(Id id) {
73 return ViewId(HiWord(id), LoWord(id));
74 }
75
ViewIdToTransportId(const ViewId & id)76 inline Id ViewIdToTransportId(const ViewId& id) {
77 return (id.connection_id << 16) | id.view_id;
78 }
79
RootNodeId()80 inline 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.
InvalidNodeId()86 inline 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