/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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/. */

#include "WindowOrientationObserver.h"

#include "nsGlobalWindow.h"

#include "mozilla/Hal.h"

using namespace mozilla::dom;

/**

 * This class is used by nsGlobalWindowInner to implement window.orientation

 * and window.onorientationchange. This class is defined in its own file

 * because Hal.h pulls in windows.h and can't be included from

 * nsGlobalWindow.cpp

 */

WindowOrientationObserver::WindowOrientationObserver(

  nsGlobalWindowInner* aGlobalWindow)

  : mWindow(aGlobalWindow)

{

  MOZ_ASSERT(aGlobalWindow);

  hal::RegisterScreenConfigurationObserver(this);

  hal::ScreenConfiguration config;

  hal::GetCurrentScreenConfiguration(&config);

  mAngle = config.angle();

}

WindowOrientationObserver::~WindowOrientationObserver()

{

  hal::UnregisterScreenConfigurationObserver(this);

}

void

WindowOrientationObserver::Notify(

  const mozilla::hal::ScreenConfiguration& aConfiguration)

{

  uint16_t currentAngle = aConfiguration.angle();

  if (mAngle != currentAngle && mWindow->AsInner()->IsCurrentInnerWindow()) {

    mAngle = currentAngle;

    mWindow->GetOuterWindow()->DispatchCustomEvent(NS_LITERAL_STRING("orientationchange"));

  }

}

/* static */ int16_t

WindowOrientationObserver::OrientationAngle()

{

  hal::ScreenConfiguration config;

  hal::GetCurrentScreenConfiguration(&config);

  int16_t angle = static_cast<int16_t>(config.angle());

  // config.angle() returns 0, 90, 180 or 270.

  // window.orientation returns -90, 0, 90 or 180.

  return angle <= 180 ? angle : angle - 360;

}