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Implementing area monitoring in Qt

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Revision as of 12:21, 24 June 2011


Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 5th Edition, Maemo 5
Symbian
Article
Created: tapla (24 May 2010)
Last edited: hamishwillee (24 Jun 2011)

Overview

This code snippet demonstrates how to implement area monitoring in Qt using the Location module of Qt Mobility. It is assumed here that you have set up Qt Mobility in your development environment and on your device. For more information, see Setting up Qt Mobility.

Qt project file

Link the Location module into the project:

CONFIG += mobility
MOBILITY = location

Using the Location module requires the Location capability:

symbian: {
TARGET.CAPABILITY = Location
}

Header

#include <qgeoareamonitor.h>
#include <qgeopositioninfo.h>
 
// QtMobility namespace
QTM_USE_NAMESPACE
 
class MainWindow : public QMainWindow
{
Q_OBJECT
 
public slots:
/**
* Called when the current position is in range of the area.
*/

void areaEntered(const QGeoPositionInfo &update);
/**
* Called when the current position moves out of range of the area.
*/

void areaExited(const QGeoPositionInfo &update);
 
private:
/**
* Initializes the area monitor.
*/

void initAreaMonitor();
}

Source

#include <qgeocoordinate.h>
void MainWindow::initAreaMonitor()
{
// Create the area monitor
QGeoAreaMonitor *monitor = QGeoAreaMonitor::createDefaultMonitor(this);
 
// Connect the area monitoring signals to the corresponding slots
connect(monitor, SIGNAL(areaEntered(QGeoPositionInfo)),
this, SLOT(areaEntered(QGeoPositionInfo)));
connect(monitor, SIGNAL(areaExited(QGeoPositionInfo)),
this, SLOT(areaExited(QGeoPositionInfo)));
qreal latitude = 60.169966;
qreal longitude = 24.952115;
QGeoCoordinate myLocation(latitude, longitude);
monitor->setCenter(myLocation);
monitor->setRadius(100);
}
 
void MainWindow::areaEntered(const QGeoPositionInfo &update) {
printString("The area has been entered.");
}
 
void MainWindow::areaExited(const QGeoPositionInfo &update) {
printString("The area has been exited.");
}

Postconditions

A specific area is defined and monitored.

See also

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