mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-24 05:11:16 +00:00
112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set sw=2 ts=8 et ft=cpp : */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_hal_WindowIdentifier_h
|
|
#define mozilla_hal_WindowIdentifier_h
|
|
|
|
#include "mozilla/Types.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsTArray.h"
|
|
|
|
class nsPIDOMWindowInner;
|
|
|
|
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(nsPIDOMWindowInner* 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 InfallibleTArray<uint64_t>& id,
|
|
nsPIDOMWindowInner* window);
|
|
|
|
/**
|
|
* Get the list of window and process IDs we contain.
|
|
*/
|
|
typedef InfallibleTArray<uint64_t> 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.
|
|
*/
|
|
nsPIDOMWindowInner* GetWindow() const;
|
|
|
|
private:
|
|
/**
|
|
* Get the ID of the window object we wrap.
|
|
*/
|
|
uint64_t GetWindowID() const;
|
|
|
|
AutoTArray<uint64_t, 3> mID;
|
|
nsCOMPtr<nsPIDOMWindowInner> mWindow;
|
|
bool mIsEmpty;
|
|
};
|
|
|
|
} // namespace hal
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_hal_WindowIdentifier_h
|