This repository has been archived by the owner on Apr 10, 2024. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 305
/
WindowIdentifier.h
142 lines (127 loc) · 4.54 KB
/
WindowIdentifier.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et ft=cpp : */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Justin Lebar <justin.lebar@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_hal_WindowIdentifier_h
#define mozilla_hal_WindowIdentifier_h
#include "mozilla/Types.h"
#include "nsTArray.h"
#include "nsCOMPtr.h"
#include "nsIDOMWindow.h"
namespace mozilla {
namespace hal {
/**
* This class serves two purposes.
*
* First, this class wraps a pointer to a window.
*
* Second, WindowIdentifier lets us uniquely identify a window across
* processes. A window exposes an ID which is unique only within its
* process. Thus to identify a window, we need to know the ID of the
* process which contains it. But the scope of a process's ID is its
* parent; that is, two processes with different parents might have
* the same ID.
*
* So to identify a window, we need its ID plus the IDs of all the
* processes in the path from the window's process to the root
* process. We throw in the IDs of the intermediate windows (a
* content window is contained in a window at each level of the
* process tree) for good measures.
*
* You can access this list of IDs by calling AsArray().
*/
class WindowIdentifier
{
public:
/**
* Create an empty WindowIdentifier. Calls to any of this object's
* public methods will assert -- an empty WindowIdentifier may be
* used only as a placeholder to code which promises not to touch
* the object.
*/
WindowIdentifier();
/**
* Copy constructor.
*/
WindowIdentifier(const WindowIdentifier& other);
/**
* Wrap the given window in a WindowIdentifier. These two
* constructors automatically grab the window's ID and append it to
* the array of IDs.
*
* Note that these constructors allow an implicit conversion to a
* WindowIdentifier.
*/
explicit WindowIdentifier(nsIDOMWindow* window);
/**
* Create a new WindowIdentifier with the given id array and window.
* This automatically grabs the window's ID and appends it to the
* array.
*/
WindowIdentifier(const nsTArray<uint64>& id, nsIDOMWindow* window);
/**
* Get the list of window and process IDs we contain.
*/
typedef InfallibleTArray<uint64> IDArrayType;
const IDArrayType& AsArray() const;
/**
* Append the ID of the ContentChild singleton to our array of
* window/process IDs.
*/
void AppendProcessID();
/**
* Does this WindowIdentifier identify both a window and the process
* containing that window? If so, we say it has traveled through
* IPC.
*/
bool HasTraveledThroughIPC() const;
/**
* Get the window this object wraps.
*/
nsIDOMWindow* GetWindow() const;
private:
/**
* Get the ID of the window object we wrap.
*/
uint64 GetWindowID() const;
AutoInfallibleTArray<uint64, 3> mID;
nsCOMPtr<nsIDOMWindow> mWindow;
bool mIsEmpty;
};
} // namespace hal
} // namespace mozilla
#endif // mozilla_hal_WindowIdentifier_h