OLD | NEW |
| (Empty) |
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 COMPONENTS_VIEW_MANAGER_IDS_H_ | |
6 #define COMPONENTS_VIEW_MANAGER_IDS_H_ | |
7 | |
8 #include "components/view_manager/public/cpp/types.h" | |
9 #include "components/view_manager/public/cpp/util.h" | |
10 | |
11 namespace view_manager { | |
12 | |
13 // Connection id is used to indicate no connection. That is, no ViewTreeImpl | |
14 // ever gets this id. | |
15 const mojo::ConnectionSpecificId kInvalidConnectionId = 0; | |
16 | |
17 // Adds a bit of type safety to view ids. | |
18 struct ViewId { | |
19 ViewId(mojo::ConnectionSpecificId connection_id, | |
20 mojo::ConnectionSpecificId view_id) | |
21 : connection_id(connection_id), view_id(view_id) {} | |
22 ViewId() : connection_id(0), view_id(0) {} | |
23 | |
24 bool operator==(const ViewId& other) const { | |
25 return other.connection_id == connection_id && | |
26 other.view_id == view_id; | |
27 } | |
28 | |
29 bool operator!=(const ViewId& other) const { | |
30 return !(*this == other); | |
31 } | |
32 | |
33 mojo::ConnectionSpecificId connection_id; | |
34 mojo::ConnectionSpecificId view_id; | |
35 }; | |
36 | |
37 inline ViewId ViewIdFromTransportId(mojo::Id id) { | |
38 return ViewId(mojo::HiWord(id), mojo::LoWord(id)); | |
39 } | |
40 | |
41 inline mojo::Id ViewIdToTransportId(const ViewId& id) { | |
42 return (id.connection_id << 16) | id.view_id; | |
43 } | |
44 | |
45 // Returns a ViewId that is reserved to indicate no view. That is, no view will | |
46 // ever be created with this id. | |
47 inline ViewId InvalidViewId() { | |
48 return ViewId(kInvalidConnectionId, 0); | |
49 } | |
50 | |
51 // Returns a root view id with a given index offset. | |
52 inline ViewId RootViewId(uint16_t index) { | |
53 return ViewId(kInvalidConnectionId, 2 + index); | |
54 } | |
55 | |
56 } // namespace view_manager | |
57 | |
58 #endif // COMPONENTS_VIEW_MANAGER_IDS_H_ | |
OLD | NEW |