/
qgsvectorlayer.cpp
5441 lines (4575 loc) · 176 KB
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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 <QDir>
#include <QFile>
#include <QImage>
#include <QPainter>
#include <QPainterPath>
#include <QPolygonF>
#include <QProgressDialog>
#include <QString>
#include <QDomNode>
#include <QVector>
#include <QStringBuilder>
#include <QUrl>
#include <QUndoCommand>
#include "qgssettings.h"
#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 "qgsexception.h"
#include "qgscurve.h"
#include "qgsdatasourceuri.h"
#include "qgsexpressionfieldbuffer.h"
#include "qgsexpressionnodeimpl.h"
#include "qgsfeature.h"
#include "qgsfeaturerequest.h"
#include "qgsfields.h"
#include "qgsgeometry.h"
#include "qgslayermetadataformatter.h"
#include "qgslogger.h"
#include "qgsmaplayerlegend.h"
#include "qgsmaptopixel.h"
#include "qgsmessagelog.h"
#include "qgsogcutils.h"
#include "qgspainting.h"
#include "qgspointxy.h"
#include "qgsproject.h"
#include "qgsproviderregistry.h"
#include "qgsrectangle.h"
#include "qgsrelationmanager.h"
#include "qgsweakrelation.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 "qgsvectorlayerfeaturecounter.h"
#include "qgspoint.h"
#include "qgsrenderer.h"
#include "qgssymbollayer.h"
#include "qgssinglesymbolrenderer.h"
#include "qgsdiagramrenderer.h"
#include "qgsstyle.h"
#include "qgspallabeling.h"
#include "qgsrulebasedlabeling.h"
#include "qgssimplifymethod.h"
#include "qgsstoredexpressionmanager.h"
#include "qgsexpressioncontext.h"
#include "qgsfeedback.h"
#include "qgsxmlutils.h"
#include "qgsunittypes.h"
#include "qgstaskmanager.h"
#include "qgstransaction.h"
#include "qgsauxiliarystorage.h"
#include "qgsgeometryoptions.h"
#include "qgsexpressioncontextutils.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
);
typedef bool deleteStyleById_t(
const QString &uri,
QString styleID,
QString &errCause
);
QgsVectorLayer::QgsVectorLayer( const QString &vectorLayerPath,
const QString &baseName,
const QString &providerKey,
const QgsVectorLayer::LayerOptions &options )
: QgsMapLayer( QgsMapLayerType::VectorLayer, baseName, vectorLayerPath )
, mServerProperties( new QgsVectorLayerServerProperties( this ) )
, mAuxiliaryLayer( nullptr )
, mAuxiliaryLayerKey( QString() )
, mReadExtentFromXml( options.readExtentFromXml )
{
mShouldValidateCrs = !options.skipCrsValidation;
if ( options.fallbackCrs.isValid() )
setCrs( options.fallbackCrs, false );
mWkbType = options.fallbackWkbType;
setProviderType( providerKey );
mGeometryOptions = qgis::make_unique<QgsGeometryOptions>();
mActions = new QgsActionManager( this );
mConditionalStyles = new QgsConditionalLayerStyles( this );
mStoredExpressionManager = new QgsStoredExpressionManager();
mStoredExpressionManager->setParent( this );
mJoinBuffer = new QgsVectorLayerJoinBuffer( this );
mJoinBuffer->setParent( this );
connect( mJoinBuffer, &QgsVectorLayerJoinBuffer::joinedFieldsChanged, this, &QgsVectorLayer::onJoinedFieldsChanged );
mExpressionFieldBuffer = new QgsExpressionFieldBuffer();
// if we're given a provider type, try to create and bind one to this layer
if ( !vectorLayerPath.isEmpty() && !mProviderKey.isEmpty() )
{
QgsDataProvider::ProviderOptions providerOptions { options.transformContext };
setDataSource( vectorLayerPath, baseName, providerKey, providerOptions, options.loadDefaultStyle );
}
connect( this, &QgsVectorLayer::selectionChanged, this, [ = ] { triggerRepaint(); } );
connect( QgsProject::instance()->relationManager(), &QgsRelationManager::relationsLoaded, this, &QgsVectorLayer::onRelationsLoaded );
connect( this, &QgsVectorLayer::subsetStringChanged, this, &QgsMapLayer::configChanged );
// Default simplify drawing settings
QgsSettings settings;
mSimplifyMethod.setSimplifyHints( settings.flagValue( QStringLiteral( "qgis/simplifyDrawingHints" ), mSimplifyMethod.simplifyHints(), QgsSettings::NoSection ) );
mSimplifyMethod.setSimplifyAlgorithm( settings.enumValue( QStringLiteral( "qgis/simplifyAlgorithm" ), mSimplifyMethod.simplifyAlgorithm() ) );
mSimplifyMethod.setThreshold( settings.value( QStringLiteral( "qgis/simplifyDrawingTol" ), mSimplifyMethod.threshold() ).toFloat() );
mSimplifyMethod.setForceLocalOptimization( settings.value( QStringLiteral( "qgis/simplifyLocal" ), mSimplifyMethod.forceLocalOptimization() ).toBool() );
mSimplifyMethod.setMaximumScale( settings.value( QStringLiteral( "qgis/simplifyMaxScale" ), mSimplifyMethod.maximumScale() ).toFloat() );
} // QgsVectorLayer ctor
QgsVectorLayer::~QgsVectorLayer()
{
emit willBeDeleted();
mValid = false;
delete mDataProvider;
delete mEditBuffer;
delete mJoinBuffer;
delete mExpressionFieldBuffer;
delete mLabeling;
delete mDiagramLayerSettings;
delete mDiagramRenderer;
delete mActions;
delete mRenderer;
delete mConditionalStyles;
delete mStoredExpressionManager;
if ( mFeatureCounter )
mFeatureCounter->cancel();
}
QgsVectorLayer *QgsVectorLayer::clone() const
{
QgsVectorLayer::LayerOptions options;
if ( mDataProvider )
{
options.transformContext = mDataProvider->transformContext();
}
QgsVectorLayer *layer = new QgsVectorLayer( source(), name(), mProviderKey, options );
if ( mDataProvider && layer->dataProvider() )
{
layer->dataProvider()->handlePostCloneOperations( mDataProvider );
}
QgsMapLayer::clone( layer );
QList<QgsVectorLayerJoinInfo> joins = vectorJoins();
const auto constJoins = joins;
for ( const QgsVectorLayerJoinInfo &join : constJoins )
{
// do not copy join information for auxiliary layer
if ( !auxiliaryLayer()
|| ( auxiliaryLayer() && auxiliaryLayer()->id() != join.joinLayerId() ) )
layer->addJoin( join );
}
layer->setProviderEncoding( dataProvider()->encoding() );
layer->setDisplayExpression( displayExpression() );
layer->setMapTipTemplate( mapTipTemplate() );
layer->setReadOnly( isReadOnly() );
layer->selectByIds( selectedFeatureIds() );
layer->setExcludeAttributesWms( excludeAttributesWms() );
layer->setExcludeAttributesWfs( excludeAttributesWfs() );
layer->setAttributeTableConfig( attributeTableConfig() );
layer->setFeatureBlendMode( featureBlendMode() );
layer->setOpacity( opacity() );
layer->setReadExtentFromXml( readExtentFromXml() );
const auto constActions = actions()->actions();
for ( const QgsAction &action : constActions )
{
layer->actions()->addAction( action );
}
if ( renderer() )
{
layer->setRenderer( renderer()->clone() );
}
if ( labeling() )
{
layer->setLabeling( labeling()->clone() );
}
layer->setLabelsEnabled( labelsEnabled() );
layer->setSimplifyMethod( simplifyMethod() );
if ( diagramRenderer() )
{
layer->setDiagramRenderer( diagramRenderer()->clone() );
}
if ( diagramLayerSettings() )
{
layer->setDiagramLayerSettings( *diagramLayerSettings() );
}
for ( int i = 0; i < fields().count(); i++ )
{
layer->setFieldAlias( i, attributeAlias( i ) );
layer->setEditorWidgetSetup( i, editorWidgetSetup( i ) );
layer->setConstraintExpression( i, constraintExpression( i ), constraintDescription( i ) );
layer->setDefaultValueDefinition( i, defaultValueDefinition( i ) );
QMap< QgsFieldConstraints::Constraint, QgsFieldConstraints::ConstraintStrength> constraints = fieldConstraintsAndStrength( i );
auto constraintIt = constraints.constBegin();
for ( ; constraintIt != constraints.constEnd(); ++ constraintIt )
{
layer->setFieldConstraint( i, constraintIt.key(), constraintIt.value() );
}
if ( fields().fieldOrigin( i ) == QgsFields::OriginExpression )
{
layer->addExpressionField( expressionField( i ), fields().at( i ) );
}
}
layer->setEditFormConfig( editFormConfig() );
if ( auxiliaryLayer() )
layer->setAuxiliaryLayer( auxiliaryLayer()->clone( layer ) );
return layer;
}
QString QgsVectorLayer::storageType() const
{
if ( mDataProvider )
{
return mDataProvider->storageType();
}
return QString();
}
QString QgsVectorLayer::capabilitiesString() const
{
if ( mDataProvider )
{
return mDataProvider->capabilitiesString();
}
return QString();
}
QString QgsVectorLayer::dataComment() const
{
if ( mDataProvider )
{
return mDataProvider->dataComment();
}
return QString();
}
QgsCoordinateReferenceSystem QgsVectorLayer::sourceCrs() const
{
return crs();
}
QString QgsVectorLayer::sourceName() const
{
return name();
}
void QgsVectorLayer::reload()
{
if ( mDataProvider )
{
mDataProvider->reloadData();
updateFields();
}
}
QgsMapLayerRenderer *QgsVectorLayer::createMapRenderer( QgsRenderContext &rendererContext )
{
return new QgsVectorLayerRenderer( this, rendererContext );
}
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 );
mPreviousSelectedFeatureIds.clear();
emit selectionChanged( QgsFeatureIds() << fid, QgsFeatureIds(), false );
}
void QgsVectorLayer::select( const QgsFeatureIds &featureIds )
{
mSelectedFeatureIds.unite( featureIds );
mPreviousSelectedFeatureIds.clear();
emit selectionChanged( featureIds, QgsFeatureIds(), false );
}
void QgsVectorLayer::deselect( const QgsFeatureId fid )
{
mSelectedFeatureIds.remove( fid );
mPreviousSelectedFeatureIds.clear();
emit selectionChanged( QgsFeatureIds(), QgsFeatureIds() << fid, false );
}
void QgsVectorLayer::deselect( const QgsFeatureIds &featureIds )
{
mSelectedFeatureIds.subtract( featureIds );
mPreviousSelectedFeatureIds.clear();
emit selectionChanged( QgsFeatureIds(), featureIds, false );
}
void QgsVectorLayer::selectByRect( QgsRectangle &rect, QgsVectorLayer::SelectBehavior behavior )
{
// normalize the rectangle
rect.normalize();
QgsFeatureIds newSelection;
QgsFeatureIterator features = getFeatures( QgsFeatureRequest()
.setFilterRect( rect )
.setFlags( QgsFeatureRequest::ExactIntersect | QgsFeatureRequest::NoGeometry )
.setNoAttributes() );
QgsFeature feat;
while ( features.nextFeature( feat ) )
{
newSelection << feat.id();
}
features.close();
selectByIds( newSelection, behavior );
}
void QgsVectorLayer::selectByExpression( const QString &expression, QgsVectorLayer::SelectBehavior behavior )
{
QgsFeatureIds newSelection;
QgsExpressionContext context( QgsExpressionContextUtils::globalProjectLayerScopes( this ) );
if ( behavior == SetSelection || behavior == AddToSelection )
{
QgsFeatureRequest request = QgsFeatureRequest().setFilterExpression( expression )
.setExpressionContext( context )
.setFlags( QgsFeatureRequest::NoGeometry )
.setNoAttributes();
QgsFeatureIterator features = getFeatures( request );
if ( behavior == AddToSelection )
{
newSelection = selectedFeatureIds();
}
QgsFeature feat;
while ( features.nextFeature( feat ) )
{
newSelection << feat.id();
}
features.close();
}
else if ( behavior == IntersectSelection || behavior == RemoveFromSelection )
{
QgsExpression exp( expression );
exp.prepare( &context );
QgsFeatureIds oldSelection = selectedFeatureIds();
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 && behavior == IntersectSelection )
{
newSelection << feat.id();
}
else if ( !matches && behavior == RemoveFromSelection )
{
newSelection << feat.id();
}
}
}
selectByIds( newSelection );
}
void QgsVectorLayer::selectByIds( const QgsFeatureIds &ids, QgsVectorLayer::SelectBehavior behavior )
{
QgsFeatureIds newSelection;
switch ( behavior )
{
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;
mPreviousSelectedFeatureIds.clear();
emit selectionChanged( newSelection, deselectedFeatures, true );
}
void QgsVectorLayer::modifySelection( const QgsFeatureIds &selectIds, const QgsFeatureIds &deselectIds )
{
QgsFeatureIds intersectingIds = selectIds & deselectIds;
if ( !intersectingIds.isEmpty() )
{
QgsDebugMsgLevel( QStringLiteral( "Trying to select and deselect the same item at the same time. Unsure what to do. Selecting dubious items." ), 3 );
}
mSelectedFeatureIds -= deselectIds;
mSelectedFeatureIds += selectIds;
mPreviousSelectedFeatureIds.clear();
emit selectionChanged( selectIds, deselectIds - intersectingIds, false );
}
void QgsVectorLayer::invertSelection()
{
QgsFeatureIds ids = allFeatureIds();
ids.subtract( mSelectedFeatureIds );
selectByIds( ids );
}
void QgsVectorLayer::selectAll()
{
selectByIds( allFeatureIds() );
}
void QgsVectorLayer::invertSelectionInRectangle( QgsRectangle &rect )
{
// normalize the rectangle
rect.normalize();
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setFilterRect( rect )
.setFlags( QgsFeatureRequest::NoGeometry | QgsFeatureRequest::ExactIntersect )
.setNoAttributes() );
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;
const QgsFeatureIds previous = mSelectedFeatureIds;
selectByIds( QgsFeatureIds() );
mPreviousSelectedFeatureIds = previous;
}
void QgsVectorLayer::reselect()
{
if ( mPreviousSelectedFeatureIds.isEmpty() || !mSelectedFeatureIds.empty() )
return;
selectByIds( mPreviousSelectedFeatureIds );
}
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( QgsDiagramRenderer *r )
{
delete mDiagramRenderer;
mDiagramRenderer = r;
emit rendererChanged();
emit styleChanged();
}
QgsWkbTypes::GeometryType QgsVectorLayer::geometryType() const
{
return QgsWkbTypes::geometryType( mWkbType );
}
QgsWkbTypes::Type QgsVectorLayer::wkbType() const
{
return mWkbType;
}
QgsRectangle QgsVectorLayer::boundingBoxOfSelected() const
{
if ( !mValid || !isSpatial() || 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 )
.setNoAttributes() );
while ( fit.nextFeature( fet ) )
{
if ( !fet.hasGeometry() )
continue;
r = fet.geometry().boundingBox();
retval.combineExtentWith( r );
}
}
else
{
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setNoAttributes() );
while ( fit.nextFeature( fet ) )
{
if ( mSelectedFeatureIds.contains( fet.id() ) )
{
if ( fet.hasGeometry() )
{
r = fet.geometry().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
{
return mLabelsEnabled && static_cast< bool >( mLabeling );
}
void QgsVectorLayer::setLabelsEnabled( bool enabled )
{
mLabelsEnabled = enabled;
}
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( const QString &legendKey ) const
{
if ( !mSymbolFeatureCounted )
return -1;
return mSymbolFeatureCountMap.value( legendKey, -1 );
}
QgsFeatureIds QgsVectorLayer::symbolFeatureIds( const QString &legendKey ) const
{
if ( !mSymbolFeatureCounted )
return QgsFeatureIds();
return mSymbolFeatureIdMap.value( legendKey, QgsFeatureIds() );
}
QgsVectorLayerFeatureCounter *QgsVectorLayer::countSymbolFeatures( bool storeSymbolFids )
{
if ( ( mSymbolFeatureCounted || mFeatureCounter ) && !( storeSymbolFids && mSymbolFeatureIdMap.isEmpty() ) )
return mFeatureCounter;
mSymbolFeatureCountMap.clear();
mSymbolFeatureIdMap.clear();
if ( !mValid )
{
QgsDebugMsgLevel( QStringLiteral( "invoked with invalid layer" ), 3 );
return mFeatureCounter;
}
if ( !mDataProvider )
{
QgsDebugMsgLevel( QStringLiteral( "invoked with null mDataProvider" ), 3 );
return mFeatureCounter;
}
if ( !mRenderer )
{
QgsDebugMsgLevel( QStringLiteral( "invoked with null mRenderer" ), 3 );
return mFeatureCounter;
}
if ( !mFeatureCounter || ( mFeatureCounter && ( storeSymbolFids && mSymbolFeatureIdMap.isEmpty() ) ) )
{
mFeatureCounter = new QgsVectorLayerFeatureCounter( this, QgsExpressionContext(), storeSymbolFids );
connect( mFeatureCounter, &QgsTask::taskCompleted, this, &QgsVectorLayer::onFeatureCounterCompleted, Qt::UniqueConnection );
connect( mFeatureCounter, &QgsTask::taskTerminated, this, &QgsVectorLayer::onFeatureCounterTerminated, Qt::UniqueConnection );
QgsApplication::taskManager()->addTask( mFeatureCounter );
}
return mFeatureCounter;
}
void QgsVectorLayer::updateExtents( bool force )
{
// do not update extent by default when trust project option is activated
if ( force || !mReadExtentFromXml || ( mReadExtentFromXml && mXmlExtent.isNull() ) )
mValidExtent = false;
}
void QgsVectorLayer::setExtent( const QgsRectangle &r )
{
QgsMapLayer::setExtent( r );
mValidExtent = true;
}
void QgsVectorLayer::updateDefaultValues( QgsFeatureId fid, QgsFeature feature )
{
if ( !mDefaultValueOnUpdateFields.isEmpty() )
{
if ( !feature.isValid() )
feature = getFeature( fid );
int size = mFields.size();
for ( int idx : qgis::as_const( mDefaultValueOnUpdateFields ) )
{
if ( idx < 0 || idx >= size )
continue;
feature.setAttribute( idx, defaultValue( idx, feature ) );
updateFeature( feature, true );
}
}
}
QgsRectangle QgsVectorLayer::extent() const
{
QgsRectangle rect;
rect.setMinimal();
if ( !isSpatial() )
return rect;
if ( !mValidExtent && mLazyExtent && mDataProvider && !mDataProvider->hasMetadata() && mReadExtentFromXml && !mXmlExtent.isNull() )
{
mExtent = mXmlExtent;
mValidExtent = true;
mLazyExtent = false;
}
if ( !mValidExtent && mLazyExtent && mDataProvider && mDataProvider->isValid() )
{
// get the extent
QgsRectangle mbr = mDataProvider->extent();
// show the extent
QgsDebugMsgLevel( QStringLiteral( "Extent of layer: %1" ).arg( mbr.toString() ), 3 );
// store the extent
mValidExtent = true;
mExtent = mbr;
mLazyExtent = false;
}
if ( mValidExtent )
return QgsMapLayer::extent();
if ( !mValid || !mDataProvider )
{
QgsDebugMsgLevel( QStringLiteral( "invoked with invalid layer or null mDataProvider" ), 3 );
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 )
{
QgsRectangle r = mDataProvider->extent();
rect.combineExtentWith( r );
}
if ( mEditBuffer )
{
for ( QgsFeatureMap::const_iterator it = mEditBuffer->mAddedFeatures.constBegin(); it != mEditBuffer->mAddedFeatures.constEnd(); ++it )
{
if ( it->hasGeometry() )
{
QgsRectangle r = it->geometry().boundingBox();
rect.combineExtentWith( r );
}
}
}
}
else
{
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setNoAttributes() );
QgsFeature fet;
while ( fit.nextFeature( fet ) )
{
if ( fet.hasGeometry() && fet.geometry().type() != QgsWkbTypes::UnknownGeometry )
{
QgsRectangle bb = fet.geometry().boundingBox();
rect.combineExtentWith( bb );
}
}
}
if ( rect.xMinimum() > rect.xMaximum() && rect.yMinimum() > rect.yMaximum() )
{
// special case when there are no features in provider nor any added
rect = QgsRectangle(); // use rectangle with zero coordinates
}
mValidExtent = true;
mExtent = rect;
// Send this (hopefully) up the chain to the map canvas
emit recalculateExtents();
return rect;
}
QgsRectangle QgsVectorLayer::sourceExtent() const
{
return extent();
}
QString QgsVectorLayer::subsetString() const
{
if ( !mValid || !mDataProvider )
{
QgsDebugMsgLevel( QStringLiteral( "invoked with invalid layer or null mDataProvider" ), 3 );
return customProperty( QStringLiteral( "storedSubsetString" ) ).toString();
}
return mDataProvider->subsetString();
}
bool QgsVectorLayer::setSubsetString( const QString &subset )
{
if ( !mValid || !mDataProvider )
{
QgsDebugMsgLevel( QStringLiteral( "invoked with invalid layer or null mDataProvider or while editing" ), 3 );
setCustomProperty( QStringLiteral( "storedSubsetString" ), subset );
return false;
}
else if ( mEditBuffer )
{
QgsDebugMsgLevel( QStringLiteral( "invoked while editing" ), 3 );
return false;
}
if ( subset == mDataProvider->subsetString() )
return true;
bool res = mDataProvider->setSubsetString( subset );
// get the updated data source string from the provider
mDataSource = mDataProvider->dataSourceUri();
updateExtents();
updateFields();
if ( res )
{
emit subsetStringChanged();
triggerRepaint();
}
return res;
}
bool QgsVectorLayer::simplifyDrawingCanbeApplied( const QgsRenderContext &renderContext, QgsVectorSimplifyMethod::SimplifyHint simplifyHint ) const
{
if ( mValid && mDataProvider && !mEditBuffer && ( isSpatial() && geometryType() != QgsWkbTypes::PointGeometry ) && ( mSimplifyMethod.simplifyHints() & simplifyHint ) && renderContext.useRenderingOptimization() )
{
double maximumSimplificationScale = mSimplifyMethod.maximumScale();
// check maximum scale at which generalisation should be carried out
return !( maximumSimplificationScale > 1 && renderContext.rendererScale() <= maximumSimplificationScale );
}
return false;
}
QgsConditionalLayerStyles *QgsVectorLayer::conditionalStyles() const
{
return mConditionalStyles;
}
QgsFeatureIterator QgsVectorLayer::getFeatures( const QgsFeatureRequest &request ) const
{
if ( !mValid || !mDataProvider )
return QgsFeatureIterator();
return QgsFeatureIterator( new QgsVectorLayerFeatureIterator( new QgsVectorLayerFeatureSource( this ), true, request ) );
}
QgsGeometry QgsVectorLayer::getGeometry( QgsFeatureId fid ) const
{
QgsFeature feature;
getFeatures( QgsFeatureRequest( fid ).setFlags( QgsFeatureRequest::SubsetOfAttributes ) ).nextFeature( feature );
if ( feature.isValid() )
return feature.geometry();
else
return QgsGeometry();
}
bool QgsVectorLayer::addFeature( QgsFeature &feature, Flags )
{
if ( !mValid || !mEditBuffer || !mDataProvider )
return false;
if ( mGeometryOptions->isActive() )
{
QgsGeometry geom = feature.geometry();
mGeometryOptions->apply( geom );
feature.setGeometry( geom );
}
bool success = mEditBuffer->addFeature( feature );
if ( success )
{
updateExtents();
if ( mJoinBuffer->containsJoins() )
success = mJoinBuffer->addFeature( feature );