gecko-dev/dom/base/nsScreen.cpp

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C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/Hal.h"
#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
#include "mozilla/dom/ScreenBinding.h"
#include "nsScreen.h"
#include "nsIDocument.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsCOMPtr.h"
#include "nsIDocShellTreeItem.h"
#include "nsLayoutUtils.h"
#include "nsJSUtils.h"
#include "nsDeviceContext.h"
using namespace mozilla;
using namespace mozilla::dom;
/* static */ already_AddRefed<nsScreen>
nsScreen::Create(nsPIDOMWindow* aWindow)
{
MOZ_ASSERT(aWindow);
if (!aWindow->GetDocShell()) {
return nullptr;
}
nsCOMPtr<nsIScriptGlobalObject> sgo =
do_QueryInterface(static_cast<nsPIDOMWindow*>(aWindow));
NS_ENSURE_TRUE(sgo, nullptr);
nsRefPtr<nsScreen> screen = new nsScreen(aWindow);
hal::RegisterScreenConfigurationObserver(screen);
hal::ScreenConfiguration config;
hal::GetCurrentScreenConfiguration(&config);
screen->mOrientation = config.orientation();
return screen.forget();
}
nsScreen::nsScreen(nsPIDOMWindow* aWindow)
: DOMEventTargetHelper(aWindow)
, mEventListener(nullptr)
{
}
nsScreen::~nsScreen()
{
MOZ_ASSERT(!mEventListener);
hal::UnregisterScreenConfigurationObserver(this);
}
// QueryInterface implementation for nsScreen
NS_INTERFACE_MAP_BEGIN(nsScreen)
NS_INTERFACE_MAP_ENTRY(nsIDOMScreen)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(nsScreen, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(nsScreen, DOMEventTargetHelper)
int32_t
nsScreen::GetPixelDepth(ErrorResult& aRv)
{
nsDeviceContext* context = GetDeviceContext();
if (!context) {
aRv.Throw(NS_ERROR_FAILURE);
return -1;
}
uint32_t depth;
context->GetDepth(depth);
return depth;
}
#define FORWARD_LONG_GETTER(_name) \
NS_IMETHODIMP \
nsScreen::Get ## _name(int32_t* aOut) \
{ \
ErrorResult rv; \
*aOut = Get ## _name(rv); \
return rv.ErrorCode(); \
}
FORWARD_LONG_GETTER(AvailWidth)
FORWARD_LONG_GETTER(AvailHeight)
FORWARD_LONG_GETTER(Width)
FORWARD_LONG_GETTER(Height)
FORWARD_LONG_GETTER(Top)
FORWARD_LONG_GETTER(Left)
FORWARD_LONG_GETTER(AvailTop)
FORWARD_LONG_GETTER(AvailLeft)
FORWARD_LONG_GETTER(PixelDepth)
FORWARD_LONG_GETTER(ColorDepth)
nsDeviceContext*
nsScreen::GetDeviceContext()
{
return nsLayoutUtils::GetDeviceContextForScreenInfo(GetOwner());
}
nsresult
nsScreen::GetRect(nsRect& aRect)
{
nsDeviceContext *context = GetDeviceContext();
if (!context) {
return NS_ERROR_FAILURE;
}
context->GetRect(aRect);
aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
return NS_OK;
}
nsresult
nsScreen::GetAvailRect(nsRect& aRect)
{
nsDeviceContext *context = GetDeviceContext();
if (!context) {
return NS_ERROR_FAILURE;
}
context->GetClientRect(aRect);
aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
return NS_OK;
}
void
nsScreen::Notify(const hal::ScreenConfiguration& aConfiguration)
{
ScreenOrientation previousOrientation = mOrientation;
mOrientation = aConfiguration.orientation();
NS_ASSERTION(mOrientation == eScreenOrientation_PortraitPrimary ||
mOrientation == eScreenOrientation_PortraitSecondary ||
mOrientation == eScreenOrientation_LandscapePrimary ||
mOrientation == eScreenOrientation_LandscapeSecondary,
"Invalid orientation value passed to notify method!");
if (mOrientation != previousOrientation) {
DispatchTrustedEvent(NS_LITERAL_STRING("mozorientationchange"));
}
}
void
nsScreen::GetMozOrientation(nsString& aOrientation)
{
switch (mOrientation) {
case eScreenOrientation_PortraitPrimary:
aOrientation.AssignLiteral("portrait-primary");
break;
case eScreenOrientation_PortraitSecondary:
aOrientation.AssignLiteral("portrait-secondary");
break;
case eScreenOrientation_LandscapePrimary:
aOrientation.AssignLiteral("landscape-primary");
break;
case eScreenOrientation_LandscapeSecondary:
aOrientation.AssignLiteral("landscape-secondary");
break;
case eScreenOrientation_None:
default:
MOZ_CRASH("Unacceptable mOrientation value");
}
}
NS_IMETHODIMP
nsScreen::GetSlowMozOrientation(nsAString& aOrientation)
{
nsString orientation;
GetMozOrientation(orientation);
aOrientation = orientation;
return NS_OK;
}
nsScreen::LockPermission
nsScreen::GetLockOrientationPermission() const
{
nsCOMPtr<nsPIDOMWindow> owner = GetOwner();
if (!owner) {
return LOCK_DENIED;
}
// Chrome can always lock the screen orientation.
nsIDocShell* docShell = owner->GetDocShell();
if (docShell && docShell->ItemType() == nsIDocShellTreeItem::typeChrome) {
return LOCK_ALLOWED;
}
nsCOMPtr<nsIDocument> doc = owner->GetDoc();
if (!doc || doc->Hidden()) {
return LOCK_DENIED;
}
// Apps can always lock the screen orientation.
if (doc->NodePrincipal()->GetAppStatus() >=
nsIPrincipal::APP_STATUS_INSTALLED) {
return LOCK_ALLOWED;
}
// Other content must be full-screen in order to lock orientation.
return doc->MozFullScreen() ? FULLSCREEN_LOCK_ALLOWED : LOCK_DENIED;
}
bool
nsScreen::MozLockOrientation(const nsAString& aOrientation, ErrorResult& aRv)
{
nsString orientation(aOrientation);
Sequence<nsString> orientations;
if (!orientations.AppendElement(orientation)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return false;
}
return MozLockOrientation(orientations, aRv);
}
bool
nsScreen::MozLockOrientation(const Sequence<nsString>& aOrientations,
ErrorResult& aRv)
{
ScreenOrientation orientation = eScreenOrientation_None;
for (uint32_t i = 0; i < aOrientations.Length(); ++i) {
const nsString& item = aOrientations[i];
if (item.EqualsLiteral("portrait")) {
orientation |= eScreenOrientation_PortraitPrimary |
eScreenOrientation_PortraitSecondary;
} else if (item.EqualsLiteral("portrait-primary")) {
orientation |= eScreenOrientation_PortraitPrimary;
} else if (item.EqualsLiteral("portrait-secondary")) {
orientation |= eScreenOrientation_PortraitSecondary;
} else if (item.EqualsLiteral("landscape")) {
orientation |= eScreenOrientation_LandscapePrimary |
eScreenOrientation_LandscapeSecondary;
} else if (item.EqualsLiteral("landscape-primary")) {
orientation |= eScreenOrientation_LandscapePrimary;
} else if (item.EqualsLiteral("landscape-secondary")) {
orientation |= eScreenOrientation_LandscapeSecondary;
} else if (item.EqualsLiteral("default")) {
orientation |= eScreenOrientation_Default;
} else {
// If we don't recognize the token, we should just return 'false'
// without throwing.
return false;
}
}
switch (GetLockOrientationPermission()) {
case LOCK_DENIED:
return false;
case LOCK_ALLOWED:
return hal::LockScreenOrientation(orientation);
case FULLSCREEN_LOCK_ALLOWED: {
// We need to register a listener so we learn when we leave full-screen
// and when we will have to unlock the screen.
// This needs to be done before LockScreenOrientation call to make sure
// the locking can be unlocked.
nsCOMPtr<EventTarget> target = do_QueryInterface(GetOwner()->GetDoc());
if (!target) {
return false;
}
if (!hal::LockScreenOrientation(orientation)) {
return false;
}
// We are fullscreen and lock has been accepted.
if (!mEventListener) {
mEventListener = new FullScreenEventListener();
}
aRv = target->AddSystemEventListener(NS_LITERAL_STRING("mozfullscreenchange"),
mEventListener, /* useCapture = */ true);
return true;
}
}
// This is only for compilers that don't understand that the previous switch
// will always return.
MOZ_CRASH("unexpected lock orientation permission value");
}
void
nsScreen::MozUnlockOrientation()
{
hal::UnlockScreenOrientation();
if (!mEventListener) {
return;
}
// Remove event listener in case of fullscreen lock.
nsCOMPtr<EventTarget> target = do_QueryInterface(GetOwner()->GetDoc());
if (target) {
target->RemoveSystemEventListener(NS_LITERAL_STRING("mozfullscreenchange"),
mEventListener, /* useCapture */ true);
}
mEventListener = nullptr;
}
bool
nsScreen::IsDeviceSizePageSize()
{
nsPIDOMWindow* owner = GetOwner();
if (owner) {
nsIDocShell* docShell = owner->GetDocShell();
if (docShell) {
return docShell->GetDeviceSizeIsPageSize();
}
}
return false;
}
/* virtual */
JSObject*
nsScreen::WrapObject(JSContext* aCx)
{
return ScreenBinding::Wrap(aCx, this);
}
NS_IMPL_ISUPPORTS(nsScreen::FullScreenEventListener, nsIDOMEventListener)
NS_IMETHODIMP
nsScreen::FullScreenEventListener::HandleEvent(nsIDOMEvent* aEvent)
{
#ifdef DEBUG
nsAutoString eventType;
aEvent->GetType(eventType);
MOZ_ASSERT(eventType.EqualsLiteral("mozfullscreenchange"));
#endif
nsCOMPtr<EventTarget> target = aEvent->InternalDOMEvent()->GetCurrentTarget();
MOZ_ASSERT(target);
nsCOMPtr<nsIDocument> doc = do_QueryInterface(target);
MOZ_ASSERT(doc);
// We have to make sure that the event we got is the event sent when
// fullscreen is disabled because we could get one when fullscreen
// got enabled if the lock call is done at the same moment.
if (doc->MozFullScreen()) {
return NS_OK;
}
target->RemoveSystemEventListener(NS_LITERAL_STRING("mozfullscreenchange"),
this, true);
hal::UnlockScreenOrientation();
return NS_OK;
}