gecko-dev/dom/system/nsAccelerometer.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 "nsAccelerometer.h"
#include "nsAutoPtr.h"
#include "nsIDOMEvent.h"
#include "nsIDOMWindow.h"
#include "nsIDOMDocument.h"
#include "nsIDOMEventTarget.h"
#include "nsIServiceManager.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIDOMDocumentEvent.h"
#include "nsIDOMOrientationEvent.h"
#include "nsIServiceManager.h"
#include "nsIPrefService.h"
class nsAcceleration : public nsIAcceleration
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIACCELERATION
nsAcceleration(double x, double y, double z);
private:
~nsAcceleration();
protected:
/* additional members */
double mX, mY, mZ;
};
/* Implementation file */
NS_IMPL_ISUPPORTS1(nsAcceleration, nsIAcceleration)
nsAcceleration::nsAcceleration(double x, double y, double z)
:mX(x), mY(y), mZ(z)
{
}
nsAcceleration::~nsAcceleration()
{
}
NS_IMETHODIMP nsAcceleration::GetX(double *aX)
{
NS_ENSURE_ARG_POINTER(aX);
*aX = mX;
return NS_OK;
}
NS_IMETHODIMP nsAcceleration::GetY(double *aY)
{
NS_ENSURE_ARG_POINTER(aY);
*aY = mY;
return NS_OK;
}
NS_IMETHODIMP nsAcceleration::GetZ(double *aZ)
{
NS_ENSURE_ARG_POINTER(aZ);
*aZ = mZ;
return NS_OK;
}
NS_IMPL_ISUPPORTS1(nsAccelerometer, nsIAccelerometer)
nsAccelerometer::nsAccelerometer()
: mLastX(10), /* initialize to values that can't be possible */
mLastY(10),
mLastZ(10),
mStarted(PR_FALSE),
mNewListener(PR_FALSE),
mUpdateInterval(50), /* default to 50 ms */
mEnabled(PR_TRUE)
{
nsCOMPtr<nsIPrefBranch> prefSrv = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefSrv) {
PRInt32 value;
nsresult rv = prefSrv->GetIntPref("accelerometer.update.interval", &value);
if (NS_SUCCEEDED(rv))
mUpdateInterval = value;
PRBool bvalue;
rv = prefSrv->GetBoolPref("accelerometer.enabled", &bvalue);
if (NS_SUCCEEDED(rv) && bvalue == PR_FALSE)
mEnabled = PR_FALSE;
}
}
nsAccelerometer::~nsAccelerometer()
{
if (mTimeoutTimer)
mTimeoutTimer->Cancel();
}
void
nsAccelerometer::StartDisconnectTimer()
{
if (mTimeoutTimer)
mTimeoutTimer->Cancel();
mTimeoutTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mTimeoutTimer)
mTimeoutTimer->InitWithFuncCallback(TimeoutHandler,
this,
2000,
nsITimer::TYPE_ONE_SHOT);
}
void
nsAccelerometer::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.
nsAccelerometer *self = reinterpret_cast<nsAccelerometer *>(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.Count() == 0) {
self->Shutdown();
self->mStarted = PR_FALSE;
}
}
NS_IMETHODIMP nsAccelerometer::AddListener(nsIAccelerationListener *aListener)
{
if (mStarted == PR_FALSE) {
mStarted = PR_TRUE;
mNewListener = PR_TRUE;
Startup();
}
mListeners.AppendObject(aListener);
return NS_OK;
}
NS_IMETHODIMP nsAccelerometer::RemoveListener(nsIAccelerationListener *aListener)
{
mListeners.RemoveObject(aListener);
StartDisconnectTimer();
return NS_OK;
}
NS_IMETHODIMP nsAccelerometer::AddWindowListener(nsIDOMWindow *aWindow)
{
if (mStarted == PR_FALSE) {
mStarted = PR_TRUE;
mNewListener = PR_TRUE;
Startup();
}
mWindowListeners.AppendObject(aWindow);
return NS_OK;
}
NS_IMETHODIMP nsAccelerometer::RemoveWindowListener(nsIDOMWindow *aWindow)
{
mWindowListeners.RemoveObject(aWindow);
StartDisconnectTimer();
return NS_OK;
}
void
nsAccelerometer::AccelerationChanged(double x, double y, double z)
{
if (!mEnabled)
return;
if (x > 1)
x = 1;
if (y > 1)
y = 1;
if (z > 1)
z = 1;
if (x < -1)
x = -1;
if (y < -1)
y = -1;
if (z < -1)
z = -1;
if (!mNewListener) {
if (PR_ABS(mLastX - x) < .01 &&
PR_ABS(mLastY - y) < .01 &&
PR_ABS(mLastZ - z) < .01)
return;
}
mLastX = x;
mLastY = y;
mLastZ = z;
mNewListener = PR_FALSE;
for (PRUint32 i = mListeners.Count(); i > 0 ; ) {
--i;
nsRefPtr<nsIAcceleration> a = new nsAcceleration(x, y, z);
mListeners[i]->OnAccelerationChange(a);
}
for (PRUint32 i = mWindowListeners.Count(); i > 0 ; ) {
--i;
nsCOMPtr<nsIDOMDocument> domdoc;
mWindowListeners[i]->GetDocument(getter_AddRefs(domdoc));
nsCOMPtr<nsIDOMDocumentEvent> docevent(do_QueryInterface(domdoc));
nsCOMPtr<nsIDOMEvent> event;
PRBool defaultActionEnabled = PR_TRUE;
if (docevent) {
docevent->CreateEvent(NS_LITERAL_STRING("orientation"), getter_AddRefs(event));
nsCOMPtr<nsIDOMOrientationEvent> oe = do_QueryInterface(event);
if (event) {
oe->InitOrientationEvent(NS_LITERAL_STRING("MozOrientation"),
PR_TRUE,
PR_FALSE,
x,
y,
z);
nsCOMPtr<nsIPrivateDOMEvent> privateEvent = do_QueryInterface(event);
if (privateEvent)
privateEvent->SetTrusted(PR_TRUE);
nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(mWindowListeners[i]));
target->DispatchEvent(event, &defaultActionEnabled);
}
}
}
}