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gecko/dom/system/nsDeviceMotion.cpp

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/* ***** 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.org code.
*
* The Initial Developer of the Original Code is
* Doug Turner <dougt@dougt.org>
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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 ***** */
#include "mozilla/Hal.h"
#include "mozilla/HalSensor.h"
#include "nsDeviceMotion.h"
#include "nsAutoPtr.h"
#include "nsIDOMEvent.h"
#include "nsIDOMWindow.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMDocument.h"
#include "nsIDOMEventTarget.h"
#include "nsIServiceManager.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIServiceManager.h"
#include "nsIPrefService.h"
using namespace mozilla;
using namespace hal;
// also see sDefaultSensorHint in mobile/android/base/GeckoAppShell.java
#define DEFAULT_SENSOR_POLL 100
static const nsTArray<nsIDOMWindow*>::index_type NoIndex =
nsTArray<nsIDOMWindow*>::NoIndex;
class nsDeviceMotionData : public nsIDeviceMotionData
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIDEVICEMOTIONDATA
nsDeviceMotionData(unsigned long type, double x, double y, double z);
private:
~nsDeviceMotionData();
protected:
unsigned long mType;
double mX, mY, mZ;
};
nsDeviceMotionData::nsDeviceMotionData(unsigned long type, double x, double y, double z)
: mType(type), mX(x), mY(y), mZ(z)
{
}
NS_INTERFACE_MAP_BEGIN(nsDeviceMotionData)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDeviceMotionData)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsDeviceMotionData)
NS_IMPL_RELEASE(nsDeviceMotionData)
nsDeviceMotionData::~nsDeviceMotionData()
{
}
NS_IMETHODIMP nsDeviceMotionData::GetType(PRUint32 *aType)
{
NS_ENSURE_ARG_POINTER(aType);
*aType = mType;
return NS_OK;
}
NS_IMETHODIMP nsDeviceMotionData::GetX(double *aX)
{
NS_ENSURE_ARG_POINTER(aX);
*aX = mX;
return NS_OK;
}
NS_IMETHODIMP nsDeviceMotionData::GetY(double *aY)
{
NS_ENSURE_ARG_POINTER(aY);
*aY = mY;
return NS_OK;
}
NS_IMETHODIMP nsDeviceMotionData::GetZ(double *aZ)
{
NS_ENSURE_ARG_POINTER(aZ);
*aZ = mZ;
return NS_OK;
}
NS_IMPL_ISUPPORTS1(nsDeviceMotion, nsIDeviceMotion)
nsDeviceMotion::nsDeviceMotion()
: mStarted(false),
mEnabled(true)
{
mLastDOMMotionEventTime = TimeStamp::Now();
mLastAccuracy = SENSOR_ACCURACY_UNKNOWN;
nsCOMPtr<nsIPrefBranch> prefSrv = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefSrv) {
bool bvalue;
nsresult rv = prefSrv->GetBoolPref("device.motion.enabled", &bvalue);
if (NS_SUCCEEDED(rv) && bvalue == false)
mEnabled = false;
}
mLastDOMMotionEventTime = TimeStamp::Now();
}
nsDeviceMotion::~nsDeviceMotion()
{
if (mStarted)
Shutdown();
if (mTimeoutTimer)
mTimeoutTimer->Cancel();
}
void
nsDeviceMotion::StartDisconnectTimer()
{
if (mTimeoutTimer)
mTimeoutTimer->Cancel();
mTimeoutTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mTimeoutTimer)
mTimeoutTimer->InitWithFuncCallback(TimeoutHandler,
this,
2000,
nsITimer::TYPE_ONE_SHOT);
}
void
nsDeviceMotion::TimeoutHandler(nsITimer *aTimer, void *aClosure)
{
// the reason that we use self, instead of just using nsITimerCallback or nsIObserver
// is so that subclasses are free to use timers without worry about the base classes's
// usage.
nsDeviceMotion *self = reinterpret_cast<nsDeviceMotion *>(aClosure);
if (!self) {
NS_ERROR("no self");
return;
}
// what about listeners that don't clean up properly? they will leak
if (self->mListeners.Count() == 0 && self->mWindowListeners.Length() == 0) {
self->Shutdown();
self->mStarted = false;
}
}
NS_IMETHODIMP nsDeviceMotion::AddListener(nsIDeviceMotionListener *aListener)
{
if (mListeners.IndexOf(aListener) != -1)
return NS_OK; // already exists
if (mStarted == false) {
mStarted = true;
Startup();
}
mListeners.AppendObject(aListener);
return NS_OK;
}
NS_IMETHODIMP nsDeviceMotion::RemoveListener(nsIDeviceMotionListener *aListener)
{
if (mListeners.IndexOf(aListener) == -1)
return NS_OK; // doesn't exist
mListeners.RemoveObject(aListener);
StartDisconnectTimer();
return NS_OK;
}
NS_IMETHODIMP nsDeviceMotion::AddWindowListener(nsIDOMWindow *aWindow)
{
if (mWindowListeners.IndexOf(aWindow) != NoIndex)
return NS_OK;
if (mStarted == false) {
mStarted = true;
Startup();
}
mWindowListeners.AppendElement(aWindow);
return NS_OK;
}
NS_IMETHODIMP nsDeviceMotion::RemoveWindowListener(nsIDOMWindow *aWindow)
{
if (mWindowListeners.IndexOf(aWindow) == NoIndex)
return NS_OK;
mWindowListeners.RemoveElement(aWindow);
StartDisconnectTimer();
return NS_OK;
}
void
nsDeviceMotion::Notify(const mozilla::hal::SensorData& aSensorData)
{
if (!mEnabled)
return;
PRUint32 type = aSensorData.sensor();
double x = aSensorData.values()[0];
double y = aSensorData.values()[1];
double z = aSensorData.values()[2];
SensorAccuracyType accuracy = aSensorData.accuracy();
if (accuracy <= SENSOR_ACCURACY_LOW && mLastAccuracy >= SENSOR_ACCURACY_MED) {
FireNeedsCalibration();
}
mLastAccuracy = accuracy;
nsCOMArray<nsIDeviceMotionListener> listeners = mListeners;
for (PRUint32 i = listeners.Count(); i > 0 ; ) {
--i;
nsRefPtr<nsDeviceMotionData> a = new nsDeviceMotionData(type, x, y, z);
listeners[i]->OnMotionChange(a);
}
nsCOMArray<nsIDOMWindow> windowListeners;
for (PRUint32 i = 0; i < mWindowListeners.Length(); i++) {
windowListeners.AppendObject(mWindowListeners[i]);
}
for (PRUint32 i = windowListeners.Count(); i > 0 ; ) {
--i;
// check to see if this window is in the background. if
// it is, don't send any device motion to it.
nsCOMPtr<nsPIDOMWindow> pwindow = do_QueryInterface(windowListeners[i]);
if (!pwindow ||
!pwindow->GetOuterWindow() ||
pwindow->GetOuterWindow()->IsBackground())
continue;
nsCOMPtr<nsIDOMDocument> domdoc;
windowListeners[i]->GetDocument(getter_AddRefs(domdoc));
if (domdoc) {
nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(windowListeners[i]);
if (type == nsIDeviceMotionData::TYPE_ACCELERATION ||
type == nsIDeviceMotionData::TYPE_LINEAR_ACCELERATION ||
type == nsIDeviceMotionData::TYPE_GYROSCOPE)
FireDOMMotionEvent(domdoc, target, type, x, y, z);
else if (type == nsIDeviceMotionData::TYPE_ORIENTATION)
FireDOMOrientationEvent(domdoc, target, x, y, z);
}
}
}
void
nsDeviceMotion::FireNeedsCalibration()
{
if (!mEnabled)
return;
nsCOMArray<nsIDeviceMotionListener> listeners = mListeners;
for (PRUint32 i = listeners.Count(); i > 0 ; ) {
--i;
listeners[i]->NeedsCalibration();
}
nsCOMArray<nsIDOMWindow> windowListeners;
for (PRUint32 i = 0; i < mWindowListeners.Length(); i++) {
windowListeners.AppendObject(mWindowListeners[i]);
}
for (PRUint32 i = windowListeners.Count(); i > 0 ; ) {
--i;
// check to see if this window is in the background. if
// it is, don't send any device motion to it.
nsCOMPtr<nsPIDOMWindow> pwindow = do_QueryInterface(windowListeners[i]);
if (!pwindow ||
!pwindow->GetOuterWindow() ||
pwindow->GetOuterWindow()->IsBackground())
continue;
nsCOMPtr<nsIDOMDocument> domdoc;
windowListeners[i]->GetDocument(getter_AddRefs(domdoc));
if (domdoc) {
nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(windowListeners[i]);
FireNeedsCalibration(domdoc, target);
}
}
}
void
nsDeviceMotion::FireNeedsCalibration(nsIDOMDocument *domdoc,
nsIDOMEventTarget *target)
{
nsCOMPtr<nsIDOMEvent> event;
domdoc->CreateEvent(NS_LITERAL_STRING("Events"), getter_AddRefs(event));
if (!event)
return;
event->InitEvent(NS_LITERAL_STRING("compassneedscalibration"), true, false);
nsCOMPtr<nsIPrivateDOMEvent> privateEvent = do_QueryInterface(event);
if (privateEvent)
privateEvent->SetTrusted(true);
bool defaultActionEnabled = true;
target->DispatchEvent(event, &defaultActionEnabled);
}
void
nsDeviceMotion::FireDOMOrientationEvent(nsIDOMDocument *domdoc,
nsIDOMEventTarget *target,
double alpha,
double beta,
double gamma)
{
nsCOMPtr<nsIDOMEvent> event;
bool defaultActionEnabled = true;
domdoc->CreateEvent(NS_LITERAL_STRING("DeviceOrientationEvent"), getter_AddRefs(event));
nsCOMPtr<nsIDOMDeviceOrientationEvent> oe = do_QueryInterface(event);
if (!oe) {
return;
}
oe->InitDeviceOrientationEvent(NS_LITERAL_STRING("deviceorientation"),
true,
false,
alpha,
beta,
gamma,
true);
nsCOMPtr<nsIPrivateDOMEvent> privateEvent = do_QueryInterface(event);
if (privateEvent)
privateEvent->SetTrusted(true);
target->DispatchEvent(event, &defaultActionEnabled);
}
void
nsDeviceMotion::FireDOMMotionEvent(nsIDOMDocument *domdoc,
nsIDOMEventTarget *target,
PRUint32 type,
double x,
double y,
double z) {
// Attempt to coalesce events
bool fireEvent = TimeStamp::Now() > mLastDOMMotionEventTime + TimeDuration::FromMilliseconds(DEFAULT_SENSOR_POLL);
switch (type) {
case nsIDeviceMotionData::TYPE_LINEAR_ACCELERATION:
mLastAcceleration = new nsDOMDeviceAcceleration(x, y, z);
break;
case nsIDeviceMotionData::TYPE_ACCELERATION:
mLastAccelerationIncluduingGravity = new nsDOMDeviceAcceleration(x, y, z);
break;
case nsIDeviceMotionData::TYPE_GYROSCOPE:
mLastRotationRate = new nsDOMDeviceRotationRate(x, y, z);
break;
}
if (!fireEvent && (!mLastAcceleration || !mLastAccelerationIncluduingGravity || !mLastRotationRate)) {
return;
}
nsCOMPtr<nsIDOMEvent> event;
domdoc->CreateEvent(NS_LITERAL_STRING("DeviceMotionEvent"), getter_AddRefs(event));
nsCOMPtr<nsIDOMDeviceMotionEvent> me = do_QueryInterface(event);
if (!me) {
return;
}
me->InitDeviceMotionEvent(NS_LITERAL_STRING("devicemotion"),
true,
false,
mLastAcceleration,
mLastAccelerationIncluduingGravity,
mLastRotationRate,
DEFAULT_SENSOR_POLL);
nsCOMPtr<nsIPrivateDOMEvent> privateEvent = do_QueryInterface(event);
if (privateEvent)
privateEvent->SetTrusted(true);
bool defaultActionEnabled = true;
target->DispatchEvent(event, &defaultActionEnabled);
mLastRotationRate = nsnull;
mLastAccelerationIncluduingGravity = nsnull;
mLastAcceleration = nsnull;
mLastDOMMotionEventTime = TimeStamp::Now();
}
void nsDeviceMotion::Startup()
{
// Bug 734855 - we probably can make this finer grain
// based on the DOM APIs that are being invoked.
RegisterSensorObserver(SENSOR_ACCELERATION, this);
RegisterSensorObserver(SENSOR_ORIENTATION, this);
RegisterSensorObserver(SENSOR_LINEAR_ACCELERATION, this);
RegisterSensorObserver(SENSOR_GYROSCOPE, this);
}
void nsDeviceMotion::Shutdown()
{
UnregisterSensorObserver(SENSOR_ACCELERATION, this);
UnregisterSensorObserver(SENSOR_ORIENTATION, this);
UnregisterSensorObserver(SENSOR_LINEAR_ACCELERATION, this);
UnregisterSensorObserver(SENSOR_GYROSCOPE, this);
}
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