зеркало из https://github.com/mozilla/gecko-dev.git
143 строки
4.5 KiB
C++
143 строки
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et ft=cpp : */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Justin Lebar <justin.lebar@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_hal_WindowIdentifier_h
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#define mozilla_hal_WindowIdentifier_h
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#include "mozilla/Types.h"
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#include "nsTArray.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMWindow.h"
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namespace mozilla {
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namespace hal {
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/**
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* This class serves two purposes.
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*
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* First, this class wraps a pointer to a window.
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*
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* Second, WindowIdentifier lets us uniquely identify a window across
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* processes. A window exposes an ID which is unique only within its
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* process. Thus to identify a window, we need to know the ID of the
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* process which contains it. But the scope of a process's ID is its
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* parent; that is, two processes with different parents might have
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* the same ID.
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*
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* So to identify a window, we need its ID plus the IDs of all the
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* processes in the path from the window's process to the root
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* process. We throw in the IDs of the intermediate windows (a
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* content window is contained in a window at each level of the
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* process tree) for good measures.
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*
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* You can access this list of IDs by calling AsArray().
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*/
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class WindowIdentifier
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{
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public:
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/**
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* Create an empty WindowIdentifier. Calls to any of this object's
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* public methods will assert -- an empty WindowIdentifier may be
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* used only as a placeholder to code which promises not to touch
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* the object.
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*/
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WindowIdentifier();
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/**
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* Copy constructor.
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*/
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WindowIdentifier(const WindowIdentifier& other);
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/**
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* Wrap the given window in a WindowIdentifier. These two
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* constructors automatically grab the window's ID and append it to
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* the array of IDs.
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*
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* Note that these constructors allow an implicit conversion to a
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* WindowIdentifier.
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*/
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explicit WindowIdentifier(nsIDOMWindow* window);
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/**
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* Create a new WindowIdentifier with the given id array and window.
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* This automatically grabs the window's ID and appends it to the
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* array.
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*/
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WindowIdentifier(const nsTArray<uint64>& id, nsIDOMWindow* window);
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/**
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* Get the list of window and process IDs we contain.
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*/
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typedef InfallibleTArray<uint64> IDArrayType;
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const IDArrayType& AsArray() const;
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/**
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* Append the ID of the ContentChild singleton to our array of
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* window/process IDs.
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*/
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void AppendProcessID();
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/**
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* Does this WindowIdentifier identify both a window and the process
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* containing that window? If so, we say it has traveled through
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* IPC.
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*/
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bool HasTraveledThroughIPC() const;
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/**
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* Get the window this object wraps.
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*/
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nsIDOMWindow* GetWindow() const;
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private:
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/**
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* Get the ID of the window object we wrap.
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*/
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uint64 GetWindowID() const;
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AutoInfallibleTArray<uint64, 3> mID;
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nsCOMPtr<nsIDOMWindow> mWindow;
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bool mIsEmpty;
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};
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} // namespace hal
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} // namespace mozilla
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#endif // mozilla_hal_WindowIdentifier_h
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