57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include "WindowOrientationObserver.h"
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#include "nsGlobalWindow.h"
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#include "mozilla/Hal.h"
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using namespace mozilla::dom;
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/**
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* This class is used by nsGlobalWindow to implement window.orientation
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* and window.onorientationchange. This class is defined in its own file
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* because Hal.h pulls in windows.h and can't be included from
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* nsGlobalWindow.cpp
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*/
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WindowOrientationObserver::WindowOrientationObserver(
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nsGlobalWindow* aGlobalWindow)
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: mWindow(aGlobalWindow)
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{
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MOZ_ASSERT(aGlobalWindow && aGlobalWindow->IsInnerWindow());
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hal::RegisterScreenConfigurationObserver(this);
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hal::ScreenConfiguration config;
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hal::GetCurrentScreenConfiguration(&config);
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mAngle = config.angle();
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}
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WindowOrientationObserver::~WindowOrientationObserver()
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{
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hal::UnregisterScreenConfigurationObserver(this);
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}
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void
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WindowOrientationObserver::Notify(
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const mozilla::hal::ScreenConfiguration& aConfiguration)
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{
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uint16_t currentAngle = aConfiguration.angle();
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if (mAngle != currentAngle && mWindow->AsInner()->IsCurrentInnerWindow()) {
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mAngle = currentAngle;
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mWindow->GetOuterWindow()->DispatchCustomEvent(NS_LITERAL_STRING("orientationchange"));
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}
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}
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/* static */ int16_t
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WindowOrientationObserver::OrientationAngle()
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{
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hal::ScreenConfiguration config;
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hal::GetCurrentScreenConfiguration(&config);
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int16_t angle = static_cast<int16_t>(config.angle());
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// config.angle() returns 0, 90, 180 or 270.
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// window.orientation returns -90, 0, 90 or 180.
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return angle <= 180 ? angle : angle - 360;
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}
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