gpsinfo.cpp

SYMBIAN GPS NMEA协议实现

#include <EikEnv.h>

#include <BluetoothGPS.rsg>

#include "gps/impl/BtGpsReceiver.h"

#include "views/GpsInfo.h"



CGpsInfo::CGpsInfo( ) {

}



CGpsInfo::~CGpsInfo( ) {

	if ( iGpsReceiver ) iGpsReceiver->RemoveListenerL( this );
	delete( iGpsReceiver );

	delete( iGpsText ); iGpsText = NULL;

}



CGpsInfo * CGpsInfo::NewL( const TRect & aRect ) {

    CGpsInfo * self = CGpsInfo::NewLC( aRect );
    CleanupStack::Pop( );

    return( self );

}



CGpsInfo * CGpsInfo::NewLC( const TRect & aRect ) {

    CGpsInfo * self = new ( ELeave ) CGpsInfo( );
    CleanupStack::PushL( self );
    self->ConstructL( aRect );

    return( self );

}



void CGpsInfo::ConstructL( const TRect & aRect ) {

	BaseConstructL( aRect, R_TEXT_GPSINFO_TITLE );

	// Texte aus den Resourcen laden.
	iGpsText = iEikonEnv->AllocReadResourceL( R_GPS_INFO_LABEL );

	// Bestimme den benutzerkonfigurierten GPS Receiver und melde "this" als
	// Listener an.
	iGpsReceiver = CBtGpsReceiver::NewL( );
	iGpsReceiver->AddListenerL( this );

	// Activate the window, which makes it ready to be drawn.
	ActivateL( );

}



void CGpsInfo::Draw( const TRect & aRect ) const {

	CWindowGc & lGc = SystemGc( );

	// Clipping auf den zu zeichnenden Bereich setzen. Das vermeidet
	// Flackern der Darstellung.. laut API.. :) Und den Bereich loeschen.
	lGc.SetClippingRect( aRect );
	lGc.Clear( );

	// Const uncasten.
	CGpsInfo * self = ( CGpsInfo * ) this;

	// Position fuer Label bestimmen.
	const CFont * theFont = iEikonEnv->NormalFont( );
	TInt vOffset = theFont->HeightInPixels( ) * 2 + theFont->BaselineOffsetInPixels( );

	// Label ausgeben.
	lGc.UseFont( theFont );
	lGc.DrawText( *iGpsText, TPoint( 10, vOffset ) );
	lGc.DiscardFont( );


	// GPS Position anzeigen.

	lGc.UseFont( iEikonEnv->AnnotationFont( ) );

	TRealFormat gpsFormat;
	gpsFormat.iPlaces = 8;
	gpsFormat.iWidth = 12;

	TBuf< 100 > temp;
	temp.Append( _L( "Lon: " ) );
	temp.AppendNum( self->iLastGpsPos.Wgs84Longitude( ), gpsFormat );
	lGc.DrawText( temp, TPoint( 10, vOffset + theFont->HeightInPixels( ) * 2 ) );

	temp.SetLength( 0 );
	temp.Append( _L( "Lat: " ) );
	temp.AppendNum( self->iLastGpsPos.Wgs84Latitude( ), gpsFormat );
	lGc.DrawText( temp, TPoint( 10, vOffset + theFont->HeightInPixels( ) * 3 ) );

	temp.SetLength( 0 );
	temp.Append( _L( "Valid: " ) );
	if ( self->iLastGpsPos.IsValid( ) )
		temp.Append( _L( "Yes" ) );
	else
		temp.Append( _L( "No" ) );
	lGc.DrawText( temp, TPoint( 10, vOffset + theFont->HeightInPixels( ) * 4 ) );

	temp.SetLength( 0 );
	temp.Append( _L( "Satellites: " ) );
	temp.AppendNum( self->iLastGpsPos.Satellites( ) );
	lGc.DrawText( temp, TPoint( 10, vOffset + theFont->HeightInPixels( ) * 5 ) );

	lGc.DiscardFont( );

}



void CGpsInfo::GpsUpdate( const TGpsPosition & aNewPosition ) {

	// Uebernehme die neue Position und aktualisiere die Ansicht.

	iLastGpsPos.Set( aNewPosition );

	DrawDeferred( );

}