src/location/qgeopositioninfosource_wince.cpp
changeset 0 876b1a06bc25
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/location/qgeopositioninfosource_wince.cpp	Wed Aug 25 15:49:42 2010 +0300
@@ -0,0 +1,179 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <windows.h>
+#include <gpsapi.h> // including requires <windows.h>
+
+#include "qgeopositioninfosource_wince_p.h"
+#include "qgeoinfothread_wince_p.h"
+
+QTM_BEGIN_NAMESPACE
+
+// ========== QGeoPositionInfoValidator ==========
+
+QGeoPositionInfoValidator::QGeoPositionInfoValidator() : QGeoInfoValidator() {}
+
+QGeoPositionInfoValidator::~QGeoPositionInfoValidator() {}
+
+// Returns true if data contains at least the minimal amount of data we need to produce the
+// QGeoPositionInfoSource positionUpdated signal, otherwise returns false.
+bool QGeoPositionInfoValidator::valid(const GPS_POSITION &data) const
+{
+    if (((data.dwValidFields & GPS_VALID_LATITUDE) == 0)
+            || ((data.dwValidFields & GPS_VALID_LONGITUDE) == 0)
+            || ((data.dwValidFields & GPS_VALID_UTC_TIME) == 0)) {
+        return false;
+    }
+    return true;
+}
+
+// ========== QGeoPositionInfoSourceWinCE ==========
+
+QGeoPositionInfoSourceWinCE::QGeoPositionInfoSourceWinCE(QObject *parent)
+        : QGeoPositionInfoSource(parent)
+{
+    QGeoInfoValidator *validator = new QGeoPositionInfoValidator();
+
+    // The QGeoInfoThreadWinCE instance takes ownership of the validator.
+    infoThread = new QGeoInfoThreadWinCE(validator, true, this);
+    infoThread->start();
+    // QGeoInfoThreadWinCE takes care of registering GPS_POSITION as a metatype.
+    connect(infoThread, SIGNAL(dataUpdated(GPS_POSITION)), this, SLOT(dataUpdated(GPS_POSITION)));
+    connect(infoThread, SIGNAL(updateTimeout()), this, SIGNAL(updateTimeout()));
+}
+
+QGeoPositionInfoSourceWinCE::~QGeoPositionInfoSourceWinCE()
+{
+    delete infoThread;
+}
+
+QGeoPositionInfoSource::PositioningMethods QGeoPositionInfoSourceWinCE::supportedPositioningMethods() const
+{
+    return QGeoPositionInfoSource::SatellitePositioningMethods;
+}
+
+QGeoPositionInfo QGeoPositionInfoSourceWinCE::lastKnownPosition(bool) const
+{
+    return lastPosition;
+}
+
+void QGeoPositionInfoSourceWinCE::setUpdateInterval(int msec)
+{
+    // If msec is 0 we send updates as data becomes available, otherwise we force msec to be equal
+    // to or larger than the minimum update interval.
+    if (msec != 0 && msec < MinimumUpdateInterval)
+        msec = MinimumUpdateInterval;
+
+    infoThread->setUpdateInterval(msec);
+    QGeoPositionInfoSource::setUpdateInterval(msec);
+}
+
+int QGeoPositionInfoSourceWinCE::minimumUpdateInterval() const
+{
+    return MinimumUpdateInterval;
+}
+
+void QGeoPositionInfoSourceWinCE::startUpdates()
+{
+    infoThread->startUpdates();
+}
+
+void QGeoPositionInfoSourceWinCE::stopUpdates()
+{
+    infoThread->stopUpdates();
+}
+
+void QGeoPositionInfoSourceWinCE::requestUpdate(int timeout)
+{
+    // A timeout of 0 means to use the default timeout, which is handled by the QGeoInfoThreadWinCE
+    // instance, otherwise if timeout is less than the minimum update interval we emit a
+    // updateTimeout signal
+    if (timeout < minimumUpdateInterval() && timeout != 0)
+        emit updateTimeout();
+    else
+        infoThread->requestUpdate(timeout);
+}
+
+/*
+ This is _only_ called when QGeoPositionInfoValidator::valid() returns true for the position.
+ This means that it is implied that:
+ - (data.dwValidFields & GPS_VALID_LATITUDE) != 0
+ - (data.dwValidFields & GPS_VALID_LONGITUDE) != 0
+ - (data.dwValidFields & GPS_VALID_UTC_TIME) != 0
+
+ This guarantees that the newly created position will be valid.
+ If the code is changed such that this is no longer guaranteed then this method will need to be
+ updated to test for those conditions.
+*/
+void QGeoPositionInfoSourceWinCE::dataUpdated(GPS_POSITION data)
+{
+    QGeoCoordinate coordinate(data.dblLatitude, data.dblLongitude);
+
+    // The altitude is optional in QGeoCoordinate, so we do not strictly require that the
+    // GPS_POSITION structure has valid altitude data in order to trigger an update.
+    if ((data.dwValidFields & GPS_VALID_ALTITUDE_WRT_SEA_LEVEL) != 0)
+        coordinate.setAltitude(data.flAltitudeWRTSeaLevel);
+
+    QDate date(data.stUTCTime.wYear, data.stUTCTime.wMonth, data.stUTCTime.wDay);
+    QTime time(data.stUTCTime.wHour, data.stUTCTime.wMinute, data.stUTCTime.wSecond,
+               data.stUTCTime.wMilliseconds);
+
+    QDateTime dateTime(date, time, Qt::UTC);
+
+    QGeoPositionInfo pos(coordinate, dateTime);
+
+    // The following properties are optional, and so are set if the data is present and valid in
+    // the GPS_POSITION structure.
+    if ((data.dwValidFields & GPS_VALID_SPEED) != 0)
+        pos.setAttribute(QGeoPositionInfo::GroundSpeed, data.flSpeed);
+
+    if ((data.dwValidFields & GPS_VALID_HEADING) != 0)
+        pos.setAttribute(QGeoPositionInfo::Direction, data.flHeading);
+
+    if ((data.dwValidFields & GPS_VALID_MAGNETIC_VARIATION) != 0)
+        pos.setAttribute(QGeoPositionInfo::MagneticVariation, data.dblMagneticVariation);
+
+    lastPosition = pos;
+    emit positionUpdated(pos);
+}
+
+#include "moc_qgeopositioninfosource_wince_p.cpp"
+QTM_END_NAMESPACE