forked from mirrors/gecko-dev
106 lines
3 KiB
C++
106 lines
3 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 "nsCOMPtr.h"
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#include "nsTArray.h"
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class nsPIDOMWindowInner;
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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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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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* 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(nsPIDOMWindowInner* 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(nsTArray<uint64_t>&& id, nsPIDOMWindowInner* 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 nsTArray<uint64_t> 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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nsPIDOMWindowInner* 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_t GetWindowID() const;
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AutoTArray<uint64_t, 3> mID;
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nsCOMPtr<nsPIDOMWindowInner> mWindow;
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#ifdef DEBUG
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bool mIsEmpty = false;
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#endif
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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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