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qgsvectorlayer.cpp
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qgsvectorlayer.cpp
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/***************************************************************************
qgsvectorlayer.cpp
--------------------
begin : Oct 29, 2003
copyright : (C) 2003 by Gary E.Sherman
email : sherman at mrcc.com
This class implements a generic means to display vector layers. The features
and attributes are read from the data store using a "data provider" plugin.
QgsVectorLayer can be used with any data store for which an appropriate
plugin is available.
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <limits>
#include <QImage>
#include <QPainter>
#include <QPainterPath>
#include <QPolygonF>
#include <QProgressDialog>
#include <QSettings>
#include <QString>
#include <QDomNode>
#include <QVector>
#include "qgsvectorlayer.h"
#include "qgsactionmanager.h"
#include "qgis.h" //for globals
#include "qgsapplication.h"
#include "qgsclipper.h"
#include "qgsconditionalstyle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatetransform.h"
#include "qgscurvev2.h"
#include "qgsdatasourceuri.h"
#include "qgsexpressionfieldbuffer.h"
#include "qgsfeature.h"
#include "qgsfeaturerequest.h"
#include "qgsfield.h"
#include "qgsgeometrycache.h"
#include "qgsgeometry.h"
#include "qgslabel.h"
#include "qgslegacyhelpers.h"
#include "qgslogger.h"
#include "qgsmaplayerlegend.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaptopixel.h"
#include "qgsmessagelog.h"
#include "qgsogcutils.h"
#include "qgspoint.h"
#include "qgsproject.h"
#include "qgsproviderregistry.h"
#include "qgsrectangle.h"
#include "qgsrelationmanager.h"
#include "qgsrendercontext.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorlayereditbuffer.h"
#include "qgsvectorlayereditpassthrough.h"
#include "qgsvectorlayereditutils.h"
#include "qgsvectorlayerfeatureiterator.h"
#include "qgsvectorlayerjoinbuffer.h"
#include "qgsvectorlayerlabeling.h"
#include "qgsvectorlayerrenderer.h"
#include "qgsvectorlayerundocommand.h"
#include "qgspointv2.h"
#include "qgsrendererv2.h"
#include "qgssymbolv2.h"
#include "qgssymbollayerv2.h"
#include "qgssinglesymbolrendererv2.h"
#include "qgsdiagramrendererv2.h"
#include "qgsstylev2.h"
#include "qgssymbologyv2conversion.h"
#include "qgspallabeling.h"
#include "qgssimplifymethod.h"
#include "qgsexpressioncontext.h"
#include "diagram/qgsdiagram.h"
#ifdef TESTPROVIDERLIB
#include <dlfcn.h>
#endif
typedef bool saveStyle_t(
const QString& uri,
const QString& qmlStyle,
const QString& sldStyle,
const QString& styleName,
const QString& styleDescription,
const QString& uiFileContent,
bool useAsDefault,
QString& errCause
);
typedef QString loadStyle_t(
const QString& uri,
QString& errCause
);
typedef int listStyles_t(
const QString& uri,
QStringList &ids,
QStringList &names,
QStringList &descriptions,
QString& errCause
);
typedef QString getStyleById_t(
const QString& uri,
QString styleID,
QString& errCause
);
QgsVectorLayer::QgsVectorLayer( const QString& vectorLayerPath,
const QString& baseName,
const QString& providerKey,
bool loadDefaultStyleFlag )
: QgsMapLayer( VectorLayer, baseName, vectorLayerPath )
, mDataProvider( nullptr )
, mProviderKey( providerKey )
, mReadOnly( false )
, mEditFormConfig( new QgsEditFormConfig( this ) )
, mWkbType( QGis::WKBUnknown )
, mRendererV2( nullptr )
, mLabel( nullptr )
, mLabelOn( false )
, mLabeling( new QgsVectorLayerSimpleLabeling )
, mLabelFontNotFoundNotified( false )
, mFeatureBlendMode( QPainter::CompositionMode_SourceOver ) // Default to normal feature blending
, mLayerTransparency( 0 )
, mVertexMarkerOnlyForSelection( false )
, mCache( new QgsGeometryCache() )
, mEditBuffer( nullptr )
, mJoinBuffer( nullptr )
, mExpressionFieldBuffer( nullptr )
, mDiagramRenderer( nullptr )
, mDiagramLayerSettings( nullptr )
, mValidExtent( false )
, mLazyExtent( true )
, mSymbolFeatureCounted( false )
, mEditCommandActive( false )
{
mActions = new QgsActionManager( this );
mConditionalStyles = new QgsConditionalLayerStyles();
// if we're given a provider type, try to create and bind one to this layer
if ( ! mProviderKey.isEmpty() )
{
setDataSource( vectorLayerPath, baseName, providerKey, loadDefaultStyleFlag );
}
connect( this, SIGNAL( selectionChanged( QgsFeatureIds, QgsFeatureIds, bool ) ), this, SIGNAL( selectionChanged() ) );
connect( this, SIGNAL( selectionChanged( QgsFeatureIds, QgsFeatureIds, bool ) ), this, SIGNAL( repaintRequested() ) );
// Default simplify drawing settings
QSettings settings;
mSimplifyMethod.setSimplifyHints( static_cast< QgsVectorSimplifyMethod::SimplifyHints >( settings.value( "/qgis/simplifyDrawingHints", static_cast< int>( mSimplifyMethod.simplifyHints() ) ).toInt() ) );
mSimplifyMethod.setThreshold( settings.value( "/qgis/simplifyDrawingTol", mSimplifyMethod.threshold() ).toFloat() );
mSimplifyMethod.setForceLocalOptimization( settings.value( "/qgis/simplifyLocal", mSimplifyMethod.forceLocalOptimization() ).toBool() );
mSimplifyMethod.setMaximumScale( settings.value( "/qgis/simplifyMaxScale", mSimplifyMethod.maximumScale() ).toFloat() );
} // QgsVectorLayer ctor
QgsVectorLayer::~QgsVectorLayer()
{
QgsDebugMsg( "entered." );
emit layerDeleted();
mValid = false;
delete mDataProvider;
delete mEditBuffer;
delete mJoinBuffer;
delete mExpressionFieldBuffer;
delete mCache;
delete mLabel; // old deprecated implementation
delete mLabeling;
delete mDiagramLayerSettings;
delete mDiagramRenderer;
delete mActions;
delete mRendererV2;
delete mConditionalStyles;
}
QString QgsVectorLayer::storageType() const
{
if ( mDataProvider )
{
return mDataProvider->storageType();
}
return nullptr;
}
QString QgsVectorLayer::capabilitiesString() const
{
if ( mDataProvider )
{
return mDataProvider->capabilitiesString();
}
return nullptr;
}
QString QgsVectorLayer::dataComment() const
{
if ( mDataProvider )
{
return mDataProvider->dataComment();
}
return QString();
}
QString QgsVectorLayer::providerType() const
{
return mProviderKey;
}
/**
* sets the preferred display field based on some fuzzy logic
*/
void QgsVectorLayer::setDisplayField( const QString& fldName )
{
if ( !hasGeometryType() )
return;
// If fldName is provided, use it as the display field, otherwise
// determine the field index for the feature column of the identify
// dialog. We look for fields containing "name" first and second for
// fields containing "id". If neither are found, the first field
// is used as the node.
QString idxName = "";
QString idxId = "";
if ( !fldName.isEmpty() )
{
mDisplayField = fldName;
}
else
{
int fieldsSize = mUpdatedFields.size();
Q_FOREACH ( const QgsField& field, mUpdatedFields )
{
QString fldName = field.name();
QgsDebugMsg( "Checking field " + fldName + " of " + QString::number( fieldsSize ) + " total" );
// Check the fields and keep the first one that matches.
// We assume that the user has organized the data with the
// more "interesting" field names first. As such, name should
// be selected before oldname, othername, etc.
if ( fldName.indexOf( "name", 0, Qt::CaseInsensitive ) > -1 )
{
if ( idxName.isEmpty() )
{
idxName = fldName;
}
}
if ( fldName.indexOf( "descrip", 0, Qt::CaseInsensitive ) > -1 )
{
if ( idxName.isEmpty() )
{
idxName = fldName;
}
}
if ( fldName.indexOf( "id", 0, Qt::CaseInsensitive ) > -1 )
{
if ( idxId.isEmpty() )
{
idxId = fldName;
}
}
}
//if there were no fields in the dbf just return - otherwise qgis segfaults!
if ( fieldsSize == 0 )
return;
if ( idxName.length() > 0 )
{
mDisplayField = idxName;
}
else
{
if ( idxId.length() > 0 )
{
mDisplayField = idxId;
}
else
{
mDisplayField = mUpdatedFields.at( 0 ).name();
}
}
}
}
// NOTE this is a temporary method added by Tim to prevent label clipping
// which was occurring when labeller was called in the main draw loop
// This method will probably be removed again in the near future!
void QgsVectorLayer::drawLabels( QgsRenderContext& rendererContext )
{
if ( !hasGeometryType() )
return;
QgsDebugMsg( "Starting draw of labels: " + id() );
if ( mRendererV2 && mLabelOn && mLabel &&
mLabel->isInScaleRange( rendererContext.rendererScale() ) )
{
QgsAttributeList attributes;
Q_FOREACH ( const QString& attrName, mRendererV2->usedAttributes() )
{
int attrNum = fieldNameIndex( attrName );
attributes.append( attrNum );
}
// make sure the renderer is ready for classification ("symbolForFeature")
mRendererV2->startRender( rendererContext, fields() );
// Add fields required for labels
mLabel->addRequiredFields( attributes );
QgsDebugMsg( "Selecting features based on view extent" );
int featureCount = 0;
try
{
// select the records in the extent. The provider sets a spatial filter
// and sets up the selection set for retrieval
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setFilterRect( rendererContext.extent() )
.setSubsetOfAttributes( attributes ) );
QgsFeature fet;
while ( fit.nextFeature( fet ) )
{
if ( mRendererV2->willRenderFeature( fet, rendererContext ) )
{
bool sel = mSelectedFeatureIds.contains( fet.id() );
mLabel->renderLabel( rendererContext, fet, sel, nullptr );
}
featureCount++;
}
}
catch ( QgsCsException &e )
{
Q_UNUSED( e );
QgsDebugMsg( "Error projecting label locations" );
}
if ( mRendererV2 )
{
mRendererV2->stopRender( rendererContext );
}
QgsDebugMsg( QString( "Total features processed %1" ).arg( featureCount ) );
}
}
void QgsVectorLayer::reload()
{
if ( mDataProvider )
{
mDataProvider->reloadData();
updateFields();
}
}
QgsMapLayerRenderer* QgsVectorLayer::createMapRenderer( QgsRenderContext& rendererContext )
{
return new QgsVectorLayerRenderer( this, rendererContext );
}
bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
{
QgsVectorLayerRenderer renderer( this, rendererContext );
return renderer.render();
}
void QgsVectorLayer::drawVertexMarker( double x, double y, QPainter& p, QgsVectorLayer::VertexMarkerType type, int m )
{
if ( type == QgsVectorLayer::SemiTransparentCircle )
{
p.setPen( QColor( 50, 100, 120, 200 ) );
p.setBrush( QColor( 200, 200, 210, 120 ) );
p.drawEllipse( x - m, y - m, m * 2 + 1, m * 2 + 1 );
}
else if ( type == QgsVectorLayer::Cross )
{
p.setPen( QColor( 255, 0, 0 ) );
p.drawLine( x - m, y + m, x + m, y - m );
p.drawLine( x - m, y - m, x + m, y + m );
}
}
void QgsVectorLayer::select( QgsFeatureId fid )
{
mSelectedFeatureIds.insert( fid );
emit selectionChanged( QgsFeatureIds() << fid, QgsFeatureIds(), false );
}
void QgsVectorLayer::select( const QgsFeatureIds& featureIds )
{
mSelectedFeatureIds.unite( featureIds );
emit selectionChanged( featureIds, QgsFeatureIds(), false );
}
void QgsVectorLayer::deselect( const QgsFeatureId fid )
{
mSelectedFeatureIds.remove( fid );
emit selectionChanged( QgsFeatureIds(), QgsFeatureIds() << fid, false );
}
void QgsVectorLayer::deselect( const QgsFeatureIds& featureIds )
{
mSelectedFeatureIds.subtract( featureIds );
emit selectionChanged( QgsFeatureIds(), featureIds, false );
}
void QgsVectorLayer::select( QgsRectangle & rect, bool addToSelection )
{
selectByRect( rect, addToSelection ? AddToSelection : SetSelection );
}
void QgsVectorLayer::selectByRect( QgsRectangle& rect, QgsVectorLayer::SelectBehaviour behaviour )
{
// normalize the rectangle
rect.normalize();
QgsFeatureIds newSelection;
QgsFeatureIterator features = getFeatures( QgsFeatureRequest()
.setFilterRect( rect )
.setFlags( QgsFeatureRequest::ExactIntersect | QgsFeatureRequest::NoGeometry )
.setSubsetOfAttributes( QgsAttributeList() ) );
QgsFeature feat;
while ( features.nextFeature( feat ) )
{
newSelection << feat.id();
}
features.close();
selectByIds( newSelection, behaviour );
}
void QgsVectorLayer::selectByExpression( const QString& expression, QgsVectorLayer::SelectBehaviour behaviour )
{
QgsFeatureIds newSelection;
QgsExpressionContext context;
context << QgsExpressionContextUtils::globalScope()
<< QgsExpressionContextUtils::projectScope()
<< QgsExpressionContextUtils::layerScope( this );
if ( behaviour == SetSelection || behaviour == AddToSelection )
{
QgsFeatureRequest request = QgsFeatureRequest().setFilterExpression( expression )
.setExpressionContext( context )
.setFlags( QgsFeatureRequest::NoGeometry )
.setSubsetOfAttributes( QgsAttributeList() );
QgsFeatureIterator features = getFeatures( request );
if ( behaviour == AddToSelection )
{
newSelection = selectedFeaturesIds();
}
QgsFeature feat;
while ( features.nextFeature( feat ) )
{
newSelection << feat.id();
}
features.close();
}
else if ( behaviour == IntersectSelection || behaviour == RemoveFromSelection )
{
QgsExpression exp( expression );
exp.prepare( &context );
QgsFeatureIds oldSelection = selectedFeaturesIds();
QgsFeatureRequest request = QgsFeatureRequest().setFilterFids( oldSelection );
//refine request
if ( !exp.needsGeometry() )
request.setFlags( QgsFeatureRequest::NoGeometry );
request.setSubsetOfAttributes( exp.referencedColumns(), fields() );
QgsFeatureIterator features = getFeatures( request );
QgsFeature feat;
while ( features.nextFeature( feat ) )
{
context.setFeature( feat );
bool matches = exp.evaluate( &context ).toBool();
if ( matches && behaviour == IntersectSelection )
{
newSelection << feat.id();
}
else if ( !matches && behaviour == RemoveFromSelection )
{
newSelection << feat.id();
}
}
}
selectByIds( newSelection );
}
void QgsVectorLayer::selectByIds( const QgsFeatureIds& ids, QgsVectorLayer::SelectBehaviour behaviour )
{
QgsFeatureIds newSelection;
switch ( behaviour )
{
case SetSelection:
newSelection = ids;
break;
case AddToSelection:
newSelection = mSelectedFeatureIds + ids;
break;
case RemoveFromSelection:
newSelection = mSelectedFeatureIds - ids;
break;
case IntersectSelection:
newSelection = mSelectedFeatureIds.intersect( ids );
break;
}
QgsFeatureIds deselectedFeatures = mSelectedFeatureIds - newSelection;
mSelectedFeatureIds = newSelection;
emit selectionChanged( newSelection, deselectedFeatures, true );
}
void QgsVectorLayer::modifySelection( QgsFeatureIds selectIds, QgsFeatureIds deselectIds )
{
QgsFeatureIds intersectingIds = selectIds & deselectIds;
if ( !intersectingIds.isEmpty() )
{
QgsDebugMsg( "Trying to select and deselect the same item at the same time. Unsure what to do. Selecting dubious items." );
}
mSelectedFeatureIds -= deselectIds;
mSelectedFeatureIds += selectIds;
emit selectionChanged( selectIds, deselectIds - intersectingIds, false );
}
void QgsVectorLayer::invertSelection()
{
QgsFeatureIds ids = allFeatureIds();
ids.subtract( mSelectedFeatureIds );
selectByIds( ids );
}
void QgsVectorLayer::selectAll()
{
selectByIds( allFeatureIds() );
}
QgsFeatureIds QgsVectorLayer::allFeatureIds()
{
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setFlags( QgsFeatureRequest::NoGeometry )
.setSubsetOfAttributes( QgsAttributeList() ) );
QgsFeatureIds ids;
QgsFeature fet;
while ( fit.nextFeature( fet ) )
{
ids << fet.id();
}
return ids;
}
void QgsVectorLayer::invertSelectionInRectangle( QgsRectangle & rect )
{
// normalize the rectangle
rect.normalize();
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setFilterRect( rect )
.setFlags( QgsFeatureRequest::NoGeometry | QgsFeatureRequest::ExactIntersect )
.setSubsetOfAttributes( QgsAttributeList() ) );
QgsFeatureIds selectIds;
QgsFeatureIds deselectIds;
QgsFeature fet;
while ( fit.nextFeature( fet ) )
{
if ( mSelectedFeatureIds.contains( fet.id() ) )
{
deselectIds << fet.id();
}
else
{
selectIds << fet.id();
}
}
modifySelection( selectIds, deselectIds );
}
void QgsVectorLayer::removeSelection()
{
if ( mSelectedFeatureIds.isEmpty() )
return;
selectByIds( QgsFeatureIds() );
}
QgsVectorDataProvider* QgsVectorLayer::dataProvider()
{
return mDataProvider;
}
const QgsVectorDataProvider* QgsVectorLayer::dataProvider() const
{
return mDataProvider;
}
void QgsVectorLayer::setProviderEncoding( const QString& encoding )
{
if ( mValid && mDataProvider && mDataProvider->encoding() != encoding )
{
mDataProvider->setEncoding( encoding );
updateFields();
}
}
void QgsVectorLayer::setDiagramRenderer( QgsDiagramRendererV2* r )
{
delete mDiagramRenderer;
mDiagramRenderer = r;
emit rendererChanged();
}
QGis::GeometryType QgsVectorLayer::geometryType() const
{
if ( mValid && mDataProvider )
{
QGis::WkbType type = mDataProvider->geometryType();
return static_cast< QGis::GeometryType >( QgsWKBTypes::geometryType( static_cast< QgsWKBTypes::Type >( type ) ) );
}
else
{
QgsDebugMsg( "invalid layer or pointer to mDataProvider is null" );
}
// We shouldn't get here, and if we have, other things are likely to
// go wrong. Code that uses the type() return value should be
// rewritten to cope with a value of QGis::Unknown. To make this
// need known, the following message is printed every time we get
// here.
QgsDebugMsg( "WARNING: This code should never be reached. Problems may occur..." );
return QGis::UnknownGeometry;
}
bool QgsVectorLayer::hasGeometryType() const
{
QGis::GeometryType t = geometryType();
return t != QGis::NoGeometry && t != QGis::UnknownGeometry;
}
QGis::WkbType QgsVectorLayer::wkbType() const
{
return mWkbType;
}
QgsRectangle QgsVectorLayer::boundingBoxOfSelected()
{
if ( !mValid || mSelectedFeatureIds.isEmpty() ) //no selected features
{
return QgsRectangle( 0, 0, 0, 0 );
}
QgsRectangle r, retval;
retval.setMinimal();
QgsFeature fet;
if ( mDataProvider->capabilities() & QgsVectorDataProvider::SelectAtId )
{
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setFilterFids( mSelectedFeatureIds )
.setSubsetOfAttributes( QgsAttributeList() ) );
while ( fit.nextFeature( fet ) )
{
if ( !fet.constGeometry() || fet.constGeometry()->isEmpty() )
continue;
r = fet.constGeometry()->boundingBox();
retval.combineExtentWith( r );
}
}
else
{
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setSubsetOfAttributes( QgsAttributeList() ) );
while ( fit.nextFeature( fet ) )
{
if ( mSelectedFeatureIds.contains( fet.id() ) )
{
if ( fet.constGeometry() )
{
r = fet.constGeometry()->boundingBox();
retval.combineExtentWith( r );
}
}
}
}
if ( retval.width() == 0.0 || retval.height() == 0.0 )
{
// If all of the features are at the one point, buffer the
// rectangle a bit. If they are all at zero, do something a bit
// more crude.
if ( retval.xMinimum() == 0.0 && retval.xMaximum() == 0.0 &&
retval.yMinimum() == 0.0 && retval.yMaximum() == 0.0 )
{
retval.set( -1.0, -1.0, 1.0, 1.0 );
}
}
return retval;
}
bool QgsVectorLayer::labelsEnabled() const
{
if ( !mLabeling )
return false;
// for simple labeling the mode can be "no labels" - so we need to check
// in properties whether we are really enabled or not
if ( mLabeling->type() == "simple" )
return customProperty( "labeling/enabled", QVariant( false ) ).toBool();
// for other labeling implementations we always assume that labeling is enabled
return true;
}
bool QgsVectorLayer::diagramsEnabled() const
{
if ( !mDiagramRenderer || !mDiagramLayerSettings )
return false;
QList<QgsDiagramSettings> settingList = mDiagramRenderer->diagramSettings();
if ( !settingList.isEmpty() )
{
return settingList.at( 0 ).enabled;
}
return false;
}
long QgsVectorLayer::featureCount( QgsSymbolV2* symbol )
{
if ( !mSymbolFeatureCounted )
return -1;
return mSymbolFeatureCountMap.value( symbol );
}
/** Used by QgsVectorLayer::countSymbolFeatures() to provide an interruption checker
* @note not available in Python bindings
*/
class QgsVectorLayerInterruptionCheckerDuringCountSymbolFeatures: public QgsInterruptionChecker
{
public:
/** Constructor */
explicit QgsVectorLayerInterruptionCheckerDuringCountSymbolFeatures( QProgressDialog* dialog )
: mDialog( dialog )
{
}
virtual bool mustStop() const
{
if ( mDialog->isVisible() )
{
// So that we get a chance of hitting the Abort button
#ifdef Q_OS_LINUX
// For some reason on Windows hasPendingEvents() always return true,
// but one iteration is actually enough on Windows to get good interactivity
// whereas on Linux we must allow for far more iterations.
// For safety limit the number of iterations
int nIters = 0;
while ( QCoreApplication::hasPendingEvents() && ++nIters < 100 )
#endif
{
QCoreApplication::processEvents();
}
return mDialog->wasCanceled();
}
return false;
}
private:
QProgressDialog* mDialog;
};
bool QgsVectorLayer::countSymbolFeatures( bool showProgress )
{
if ( mSymbolFeatureCounted )
return true;
mSymbolFeatureCountMap.clear();
if ( !mValid )
{
QgsDebugMsg( "invoked with invalid layer" );
return false;
}
if ( !mDataProvider )
{
QgsDebugMsg( "invoked with null mDataProvider" );
return false;
}
if ( !mRendererV2 )
{
QgsDebugMsg( "invoked with null mRendererV2" );
return false;
}
QgsLegendSymbolList symbolList = mRendererV2->legendSymbolItems();
QgsLegendSymbolList::const_iterator symbolIt = symbolList.constBegin();
for ( ; symbolIt != symbolList.constEnd(); ++symbolIt )
{
mSymbolFeatureCountMap.insert( symbolIt->second, 0 );
}
long nFeatures = featureCount();
QWidget* mainWindow = nullptr;
Q_FOREACH ( QWidget* widget, qApp->topLevelWidgets() )
{
if ( widget->objectName() == "QgisApp" )
{
mainWindow = widget;
break;
}
}
QProgressDialog progressDialog( tr( "Updating feature count for layer %1" ).arg( name() ), tr( "Abort" ), 0, nFeatures, mainWindow );
progressDialog.setWindowTitle( tr( "QGIS" ) );
progressDialog.setWindowModality( Qt::WindowModal );
if ( showProgress )
{
// Properly initialize to 0 as recommended in doc so that the evaluation
// of the total time properly works
progressDialog.setValue( 0 );
}
int featuresCounted = 0;
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest().setFlags( QgsFeatureRequest::NoGeometry ) );
QgsVectorLayerInterruptionCheckerDuringCountSymbolFeatures interruptionCheck( &progressDialog );
if ( showProgress )
{
fit.setInterruptionChecker( &interruptionCheck );
}
// Renderer (rule based) may depend on context scale, with scale is ignored if 0
QgsRenderContext renderContext;
renderContext.setRendererScale( 0 );
renderContext.expressionContext() << QgsExpressionContextUtils::globalScope()
<< QgsExpressionContextUtils::projectScope()
<< QgsExpressionContextUtils::layerScope( this );
mRendererV2->startRender( renderContext, fields() );
QgsFeature f;
QTime time;
time.start();
while ( fit.nextFeature( f ) )
{
renderContext.expressionContext().setFeature( f );
QgsSymbolV2List featureSymbolList = mRendererV2->originalSymbolsForFeature( f, renderContext );
for ( QgsSymbolV2List::iterator symbolIt = featureSymbolList.begin(); symbolIt != featureSymbolList.end(); ++symbolIt )
{
mSymbolFeatureCountMap[*symbolIt] += 1;
}
++featuresCounted;
if ( showProgress )
{
// Refresh progress every 50 features or second
if (( featuresCounted % 50 == 0 ) || time.elapsed() > 1000 )
{
time.restart();
if ( featuresCounted > nFeatures ) //sometimes the feature count is not correct
{
progressDialog.setMaximum( 0 );
}
progressDialog.setValue( featuresCounted );
}
// So that we get a chance of hitting the Abort button
#ifdef Q_OS_LINUX
// For some reason on Windows hasPendingEvents() always return true,
// but one iteration is actually enough on Windows to get good interactivity
// whereas on Linux we must allow for far more iterations.
// For safety limit the number of iterations
int nIters = 0;
while ( QCoreApplication::hasPendingEvents() && ++nIters < 100 )
#endif
{
QCoreApplication::processEvents();
}
if ( progressDialog.wasCanceled() )
{
mSymbolFeatureCountMap.clear();
mRendererV2->stopRender( renderContext );
return false;
}
}
}
mRendererV2->stopRender( renderContext );
progressDialog.setValue( nFeatures );
mSymbolFeatureCounted = true;
return true;
}
void QgsVectorLayer::updateExtents()
{
mValidExtent = false;
}
void QgsVectorLayer::setExtent( const QgsRectangle &r )
{
QgsMapLayer::setExtent( r );
mValidExtent = true;
}
QgsRectangle QgsVectorLayer::extent()
{
QgsRectangle rect;
rect.setMinimal();
if ( !hasGeometryType() )
return rect;
if ( !mValidExtent && mLazyExtent && mDataProvider )
{
// get the extent
QgsRectangle mbr = mDataProvider->extent();
// show the extent
QgsDebugMsg( "Extent of layer: " + mbr.toString() );
// store the extent
setExtent( mbr );
mLazyExtent = false;
}
if ( mValidExtent )
return QgsMapLayer::extent();
if ( !mValid || !mDataProvider )
{
QgsDebugMsg( "invoked with invalid layer or null mDataProvider" );
return rect;
}
if ( !mEditBuffer ||
( mEditBuffer->mDeletedFeatureIds.isEmpty() && mEditBuffer->mChangedGeometries.isEmpty() ) ||
QgsDataSourceURI( mDataProvider->dataSourceUri() ).useEstimatedMetadata() )
{
mDataProvider->updateExtents();
// get the extent of the layer from the provider
// but only when there are some features already
if ( mDataProvider->featureCount() != 0 )
{