QgsMapCanvas::QgsMapCanvas( QWidget * parent )
: QGraphicsView( parent )
, mCanvasProperties( new CanvasProperties )
, mMap( nullptr )
, mFrozen( false )
, mRefreshScheduled( false )
, mRenderFlag( true ) // by default, the canvas is rendered
, mCurrentLayer( nullptr )
, mScene( nullptr )
, mMapTool( nullptr )
, mLastNonZoomMapTool( nullptr )
, mLastExtentIndex( -1 )
, mWheelZoomFactor( 2.0 )
, mJob( nullptr )
, mJobCancelled( false )
, mLabelingResults( nullptr )
, mUseParallelRendering( false )
, mDrawRenderingStats( false )
, mCache( nullptr )
, mResizeTimer( nullptr )
, mPreviewEffect( nullptr )
, mSnappingUtils( nullptr )
, mScaleLocked( false )
, mExpressionContextScope( tr( "Map Canvas" ) )
, mZoomDragging( false )
{
mScene = new QGraphicsScene();
setScene( mScene );
setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setMouseTracking( true );
setFocusPolicy( Qt::StrongFocus );
mResizeTimer = new QTimer( this );
mResizeTimer->setSingleShot( true );
connect( mResizeTimer, SIGNAL( timeout() ), this, SLOT( refresh() ) );
// create map canvas item which will show the map
mMap = new QgsMapCanvasMap( this );
// project handling
connect( QgsProject::instance(), SIGNAL( readProject( const QDomDocument & ) ),
this, SLOT( readProject( const QDomDocument & ) ) );
connect( QgsProject::instance(), SIGNAL( writeProject( QDomDocument & ) ),
this, SLOT( writeProject( QDomDocument & ) ) );
mSettings.setFlag( QgsMapSettings::DrawEditingInfo );
mSettings.setFlag( QgsMapSettings::UseRenderingOptimization );
mSettings.setFlag( QgsMapSettings::RenderPartialOutput );
//segmentation parameters
QSettings settings;
double segmentationTolerance = settings.value( QStringLiteral( "/qgis/segmentationTolerance" ), "0.01745" ).toDouble();
QgsAbstractGeometry::SegmentationToleranceType toleranceType = QgsAbstractGeometry::SegmentationToleranceType( settings.value( QStringLiteral( "/qgis/segmentationToleranceType" ), 0 ).toInt() );
mSettings.setSegmentationTolerance( segmentationTolerance );
mSettings.setSegmentationToleranceType( toleranceType );
mWheelZoomFactor = settings.value( QStringLiteral( "/qgis/zoom_factor" ), 2 ).toDouble();
QSize s = viewport()->size();
mSettings.setOutputSize( s );
setSceneRect( 0, 0, s.width(), s.height() );
mScene->setSceneRect( QRectF( 0, 0, s.width(), s.height() ) );
moveCanvasContents( true );
connect( &mMapUpdateTimer, SIGNAL( timeout() ), SLOT( mapUpdateTimeout() ) );
mMapUpdateTimer.setInterval( 250 );
#ifdef Q_OS_WIN
// Enable touch event on Windows.
// Qt on Windows needs to be told it can take touch events or else it ignores them.
grabGesture( Qt::PinchGesture );
viewport()->setAttribute( Qt::WA_AcceptTouchEvents );
#endif
mPreviewEffect = new QgsPreviewEffect( this );
viewport()->setGraphicsEffect( mPreviewEffect );
QPixmap zoomPixmap = QPixmap(( const char ** )( zoom_in ) );
mZoomCursor = QCursor( zoomPixmap, 7, 7 );
setInteractive( false );
refresh();
} // QgsMapCanvas ctor
QgsMapCanvas::QgsMapCanvas( QWidget * parent, const char *name )
: QGraphicsView( parent )
, mCanvasProperties( new CanvasProperties )
, mJob( 0 )
, mJobCancelled( false )
, mLabelingResults( 0 )
, mUseParallelRendering( false )
, mDrawRenderingStats( false )
, mCache( 0 )
, mPreviewEffect( 0 )
, mSnappingUtils( 0 )
{
setObjectName( name );
mScene = new QGraphicsScene();
setScene( mScene );
setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
mLastExtentIndex = -1;
mCurrentLayer = NULL;
mMapOverview = NULL;
mMapTool = NULL;
mLastNonZoomMapTool = NULL;
mFrozen = false;
mRefreshScheduled = false;
setWheelAction( WheelZoom );
// by default, the canvas is rendered
mRenderFlag = true;
setMouseTracking( true );
setFocusPolicy( Qt::StrongFocus );
mMapRenderer = new QgsMapRenderer;
mResizeTimer = new QTimer( this );
mResizeTimer->setSingleShot( true );
connect( mResizeTimer, SIGNAL( timeout() ), this, SLOT( refresh() ) );
// create map canvas item which will show the map
mMap = new QgsMapCanvasMap( this );
// project handling
connect( QgsProject::instance(), SIGNAL( readProject( const QDomDocument & ) ),
this, SLOT( readProject( const QDomDocument & ) ) );
connect( QgsProject::instance(), SIGNAL( writeProject( QDomDocument & ) ),
this, SLOT( writeProject( QDomDocument & ) ) );
mSettings.setFlag( QgsMapSettings::DrawEditingInfo );
mSettings.setFlag( QgsMapSettings::UseRenderingOptimization );
// class that will sync most of the changes between canvas and (legacy) map renderer
// it is parented to map canvas, will be deleted automatically
new QgsMapCanvasRendererSync( this, mMapRenderer );
QSize s = viewport()->size();
mSettings.setOutputSize( s );
mMapRenderer->setOutputSize( s, mSettings.outputDpi() );
setSceneRect( 0, 0, s.width(), s.height() );
mScene->setSceneRect( QRectF( 0, 0, s.width(), s.height() ) );
moveCanvasContents( true );
connect( &mMapUpdateTimer, SIGNAL( timeout() ), SLOT( mapUpdateTimeout() ) );
mMapUpdateTimer.setInterval( 250 );
#ifdef Q_OS_WIN
// Enable touch event on Windows.
// Qt on Windows needs to be told it can take touch events or else it ignores them.
grabGesture( Qt::PinchGesture );
viewport()->setAttribute( Qt::WA_AcceptTouchEvents );
#endif
mPreviewEffect = new QgsPreviewEffect( this );
viewport()->setGraphicsEffect( mPreviewEffect );
setInteractive( false );
refresh();
} // QgsMapCanvas ctor