gecko/hal/Hal.h

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/* -*- 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):
* Chris Jones <jones.chris.g@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_h
#define mozilla_Hal_h 1
#include "base/basictypes.h"
#include "mozilla/Types.h"
#include "nsTArray.h"
#include "nsCOMPtr.h"
#include "nsIDOMWindow.h"
#include "prlog.h"
#include "mozilla/dom/battery/Types.h"
#ifndef MOZ_HAL_NAMESPACE
namespace mozilla {
namespace dom {
class TabChild;
class PBrowserChild;
}
}
// Only include this hunk of code once, and include it before
// HalImpl.h and HalSandbox.h.
namespace mozilla {
namespace hal {
extern PRLogModuleInfo *sHalLog;
#define HAL_LOG(msg) PR_LOG(sHalLog, PR_LOG_DEBUG, msg)
/**
* 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.
*/
WindowIdentifier(nsIDOMWindow* window);
WindowIdentifier(nsCOMPtr<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
// This goop plays some cpp tricks to ensure a uniform API across the
// API entry point, "sandbox" implementations (for content processes),
// and "impl" backends where the real work happens. After this runs
// through cpp, there will be three sets of identical APIs
// hal_impl:: --- the platform-specific implementation of an API.
// hal_sandbox:: --- forwards calls up to the parent process
// hal:: --- invokes sandboxed impl if in a sandboxed process,
// otherwise forwards to hal_impl
//
// External code should never invoke hal_impl:: or hal_sandbox:: code
// directly.
# include "HalImpl.h"
# include "HalSandbox.h"
# define MOZ_HAL_NAMESPACE hal
# define MOZ_DEFINED_HAL_NAMESPACE 1
#endif
namespace mozilla {
namespace hal {
class BatteryInformation;
} // namespace hal
namespace MOZ_HAL_NAMESPACE /*hal*/ {
/**
* Turn the default vibrator device on/off per the pattern specified
* by |pattern|. Each element in the pattern is the number of
* milliseconds to turn the vibrator on or off. The first element in
* |pattern| is an "on" element, the next is "off", and so on.
*
* If |pattern| is empty, any in-progress vibration is canceled.
*
* Only an active window within an active tab may call Vibrate; calls
* from inactive windows and windows on inactive tabs do nothing.
*
* If you're calling hal::Vibrate from the outside world, pass an
* nsIDOMWindow* or an nsCOMPtr<nsIDOMWindow>& in place of the
* WindowIdentifier parameter. It'll be converted to a WindowIdentifier
* automatically.
*/
void Vibrate(const nsTArray<uint32>& pattern,
const hal::WindowIdentifier &id);
/**
* Cancel a vibration started by the content window identified by
* WindowIdentifier.
*
* If the window was the last window to start a vibration, the
* cancellation request will go through even if the window is not
* active.
*
* As with hal::Vibrate(), if you're calling hal::CancelVibrate from
* the outside world, pass an nsIDOMWindow* or an
* nsCOMPtr<nsIDOMWindow>&. This will automatically be converted to a
* WindowIdentifier object.
*/
void CancelVibrate(const hal::WindowIdentifier &id);
/**
* Inform the battery backend there is a new battery observer.
* @param aBatteryObserver The observer that should be added.
*/
void RegisterBatteryObserver(BatteryObserver* aBatteryObserver);
/**
* Inform the battery backend a battery observer unregistered.
* @param aBatteryObserver The observer that should be removed.
*/
void UnregisterBatteryObserver(BatteryObserver* aBatteryObserver);
/**
* Enables battery notifications from the backend.
*
* This method is semi-private in the sense of it is visible in the hal
* namespace but should not be used. Calls to this method from the hal
* namespace will produce a link error because it is not defined.
*/
void EnableBatteryNotifications();
/**
* Disables battery notifications from the backend.
*
* This method is semi-private in the sense of it is visible in the hal
* namespace but should not be used. Calls to this method from the hal
* namespace will produce a link error because it is not defined.
*/
void DisableBatteryNotifications();
/**
* Returns the current battery information.
*/
void GetCurrentBatteryInformation(hal::BatteryInformation* aBatteryInfo);
/**
* Notify of a change in the battery state.
* @param aBatteryInfo The new battery information.
*/
void NotifyBatteryChange(const hal::BatteryInformation& aBatteryInfo);
/**
* Determine whether the device's screen is currently enabled.
*/
bool GetScreenEnabled();
/**
* Enable or disable the device's screen.
*
* Note that it may take a few seconds for the screen to turn on or off.
*/
void SetScreenEnabled(bool enabled);
/**
* Get the brightness of the device's screen's backlight, on a scale from 0
* (very dim) to 1 (full blast).
*
* If the display is currently disabled, this returns the brightness the
* backlight will have when the display is re-enabled.
*/
double GetScreenBrightness();
/**
* Set the brightness of the device's screen's backlight, on a scale from 0
* (very dimm) to 1 (full blast). Values larger than 1 are treated like 1, and
* values smaller than 0 are treated like 0.
*
* Note that we may reduce the resolution of the given brightness value before
* sending it to the screen. Therefore if you call SetScreenBrightness(x)
* followed by GetScreenBrightness(), the value returned by
* GetScreenBrightness() may not be exactly x.
*/
void SetScreenBrightness(double brightness);
} // namespace MOZ_HAL_NAMESPACE
} // namespace mozilla
#ifdef MOZ_DEFINED_HAL_NAMESPACE
# undef MOZ_DEFINED_HAL_NAMESPACE
# undef MOZ_HAL_NAMESPACE
#endif
#endif // mozilla_Hal_h