1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #include "WindowOrientationObserver.h"
9 #include "nsGlobalWindow.h"
10 #include "mozilla/Hal.h"
12 using namespace mozilla::dom
;
15 * This class is used by nsGlobalWindowInner to implement window.orientation
16 * and window.onorientationchange. This class is defined in its own file
17 * because Hal.h pulls in windows.h and can't be included from
20 WindowOrientationObserver::WindowOrientationObserver(
21 nsGlobalWindowInner
* aGlobalWindow
)
22 : mWindow(aGlobalWindow
) {
23 MOZ_ASSERT(aGlobalWindow
);
24 hal::RegisterScreenConfigurationObserver(this);
26 hal::ScreenConfiguration config
;
27 hal::GetCurrentScreenConfiguration(&config
);
28 mAngle
= config
.angle();
31 WindowOrientationObserver::~WindowOrientationObserver() {
32 hal::UnregisterScreenConfigurationObserver(this);
35 void WindowOrientationObserver::Notify(
36 const mozilla::hal::ScreenConfiguration
& aConfiguration
) {
37 uint16_t currentAngle
= aConfiguration
.angle();
38 if (mAngle
!= currentAngle
&& mWindow
->IsCurrentInnerWindow()) {
39 mAngle
= currentAngle
;
40 mWindow
->GetOuterWindow()->DispatchCustomEvent(u
"orientationchange"_ns
);
45 int16_t WindowOrientationObserver::OrientationAngle() {
46 hal::ScreenConfiguration config
;
47 hal::GetCurrentScreenConfiguration(&config
);
48 int16_t angle
= static_cast<int16_t>(config
.angle());
49 // config.angle() returns 0, 90, 180 or 270.
50 // window.orientation returns -90, 0, 90 or 180.
51 return angle
<= 180 ? angle
: angle
- 360;