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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 "qgscsexception.h"
#include "qgscurve.h"
#include "qgsdatasourceuri.h"
#include "qgsexpressionfieldbuffer.h"
#include "qgsfeature.h"
#include "qgsfeaturerequest.h"
#include "qgsfields.h"
#include "qgsgeometrycache.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsmaplayerlegend.h"
#include "qgsmaptopixel.h"
#include "qgsmessagelog.h"
#include "qgsogcutils.h"
#include "qgspainting.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 "qgsrenderer.h"
#include "qgssymbollayer.h"
#include "qgssinglesymbolrenderer.h"
#include "qgsdiagramrenderer.h"
#include "qgsstyle.h"
#include "qgspallabeling.h"
#include "qgssimplifymethod.h"
#include "qgsexpressioncontext.h"
#include "qgsfeedback.h"
#include "qgsxmlutils.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,
bool loadDefaultStyleFlag )
: QgsMapLayer( VectorLayer, baseName, vectorLayerPath )
, mDataProvider( nullptr )
, mProviderKey( providerKey )
, mReadOnly( false )
, mWkbType( QgsWkbTypes::Unknown )
, mRenderer( nullptr )
, 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();
mJoinBuffer = new QgsVectorLayerJoinBuffer( this );
connect( mJoinBuffer, &QgsVectorLayerJoinBuffer::joinedFieldsChanged, this, &QgsVectorLayer::onJoinedFieldsChanged );
// 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, &QgsVectorLayer::selectionChanged, this, [=] { emit repaintRequested(); } );
connect( QgsProject::instance()->relationManager(), &QgsRelationManager::relationsLoaded, this, &QgsVectorLayer::onRelationsLoaded );
// Default simplify drawing settings
QSettings settings;
mSimplifyMethod.setSimplifyHints( static_cast< QgsVectorSimplifyMethod::SimplifyHints >( settings.value( QStringLiteral( "/qgis/simplifyDrawingHints" ), static_cast< int>( mSimplifyMethod.simplifyHints() ) ).toInt() ) );
mSimplifyMethod.setSimplifyAlgorithm( static_cast< QgsVectorSimplifyMethod::SimplifyAlgorithm >( settings.value( QStringLiteral( "/qgis/simplifyAlgorithm" ), static_cast< int>( mSimplifyMethod.simplifyAlgorithm() ) ).toInt() ) );
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 mCache;
delete mLabeling;
delete mDiagramLayerSettings;
delete mDiagramRenderer;
delete mActions;
delete mRenderer;
delete mConditionalStyles;
}
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();
}
QString QgsVectorLayer::providerType() const
{
return mProviderKey;
}
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 );
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::selectByRect( QgsRectangle& rect, QgsVectorLayer::SelectBehavior behavior )
{
// 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, 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 )
.setSubsetOfAttributes( QgsAttributeList() );
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;
emit selectionChanged( newSelection, deselectedFeatures, true );
}
void QgsVectorLayer::modifySelection( const QgsFeatureIds &selectIds, const 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() const
{
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( QgsDiagramRenderer* r )
{
delete mDiagramRenderer;
mDiagramRenderer = r;
emit rendererChanged();
emit styleChanged();
}
QgsWkbTypes::GeometryType QgsVectorLayer::geometryType() const
{
if ( mValid && mDataProvider )
{
return QgsWkbTypes::geometryType( mDataProvider->wkbType() );
}
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 QgsWkbTypes::UnknownGeometry;
}
bool QgsVectorLayer::hasGeometryType() const
{
QgsWkbTypes::GeometryType t = geometryType();
return t != QgsWkbTypes::NullGeometry && t != QgsWkbTypes::UnknownGeometry;
}
QgsWkbTypes::Type QgsVectorLayer::wkbType() const
{
return mWkbType;
}
QgsRectangle QgsVectorLayer::boundingBoxOfSelected() const
{
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.hasGeometry() )
continue;
r = fet.geometry().boundingBox();
retval.combineExtentWith( r );
}
}
else
{
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setSubsetOfAttributes( QgsAttributeList() ) );
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
{
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() == QLatin1String( "simple" ) )
return customProperty( QStringLiteral( "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( const QString& legendKey ) const
{
if ( !mSymbolFeatureCounted )
return -1;
return mSymbolFeatureCountMap.value( legendKey );
}
/** \ingroup core
* 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 )
{
}
bool mustStop() const override
{
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 = nullptr;
};
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 ( !mRenderer )
{
QgsDebugMsg( "invoked with null mRenderer" );
return false;
}
QgsLegendSymbolList symbolList = mRenderer->legendSymbolItems();
QgsLegendSymbolList::const_iterator symbolIt = symbolList.constBegin();
for ( ; symbolIt != symbolList.constEnd(); ++symbolIt )
{
mSymbolFeatureCountMap.insert( symbolIt->first, 0 );
}
long nFeatures = featureCount();
QWidget* mainWindow = nullptr;
Q_FOREACH ( QWidget* widget, qApp->topLevelWidgets() )
{
if ( widget->objectName() == QLatin1String( "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;
// Renderer (rule based) may depend on context scale, with scale is ignored if 0
QgsRenderContext renderContext;
renderContext.setRendererScale( 0 );
renderContext.expressionContext().appendScopes( QgsExpressionContextUtils::globalProjectLayerScopes( this ) );
QgsFeatureRequest request;
if ( !mRenderer->filterNeedsGeometry() )
request.setFlags( QgsFeatureRequest::NoGeometry );
request.setSubsetOfAttributes( mRenderer->usedAttributes( renderContext ), mFields );
QgsFeatureIterator fit = getFeatures( request );
QgsVectorLayerInterruptionCheckerDuringCountSymbolFeatures interruptionCheck( &progressDialog );
if ( showProgress )
{
fit.setInterruptionChecker( &interruptionCheck );
}
mRenderer->startRender( renderContext, fields() );
QgsFeature f;
QTime time;
time.start();
while ( fit.nextFeature( f ) )
{
renderContext.expressionContext().setFeature( f );
QSet<QString> featureKeyList = mRenderer->legendKeysForFeature( f, renderContext );
Q_FOREACH ( const QString& key, featureKeyList )
{
mSymbolFeatureCountMap[key] += 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();
mRenderer->stopRender( renderContext );
return false;
}
}
}
mRenderer->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() const
{
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
mValidExtent = true;
mExtent = 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 )
{
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()
.setSubsetOfAttributes( QgsAttributeList() ) );
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;
}
QString QgsVectorLayer::subsetString() const
{
if ( !mValid || !mDataProvider )
{
QgsDebugMsg( "invoked with invalid layer or null mDataProvider" );
return QString();
}
return mDataProvider->subsetString();
}
bool QgsVectorLayer::setSubsetString( const QString& subset )
{
if ( !mValid || !mDataProvider )
{
QgsDebugMsg( "invoked with invalid layer or null mDataProvider" );
return false;
}
bool res = mDataProvider->setSubsetString( subset );
// get the updated data source string from the provider
mDataSource = mDataProvider->dataSourceUri();
updateExtents();
updateFields();
if ( res )
emit repaintRequested();
return res;
}
bool QgsVectorLayer::simplifyDrawingCanbeApplied( const QgsRenderContext& renderContext, QgsVectorSimplifyMethod::SimplifyHint simplifyHint ) const
{
if ( mValid && mDataProvider && !mEditBuffer && ( hasGeometryType() && 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 ) );
}
bool QgsVectorLayer::addFeature( QgsFeature& feature, bool alsoUpdateExtent )
{
Q_UNUSED( alsoUpdateExtent ); // TODO[MD]
if ( !mValid || !mEditBuffer || !mDataProvider )
return false;
bool success = mEditBuffer->addFeature( feature );
if ( success )
updateExtents();
return success;
}
bool QgsVectorLayer::updateFeature( QgsFeature &f )
{
QgsFeatureRequest req;
req.setFilterFid( f.id() );
if ( !f.hasGeometry() )
req.setFlags( QgsFeatureRequest::NoGeometry );
if ( f.attributes().isEmpty() )
req.setSubsetOfAttributes( QgsAttributeList() );
QgsFeature current;
if ( !getFeatures( req ).nextFeature( current ) )
{
QgsDebugMsg( QString( "feature %1 could not be retrieved" ).arg( f.id() ) );
return false;
}
if ( f.hasGeometry() && current.hasGeometry() && !f.geometry().isGeosEqual( current.geometry() ) )
{
if ( !changeGeometry( f.id(), f.geometry() ) )
{
QgsDebugMsg( QString( "geometry of feature %1 could not be changed." ).arg( f.id() ) );
return false;
}
}
QgsAttributes fa = f.attributes();
QgsAttributes ca = current.attributes();
for ( int attr = 0; attr < fa.count(); ++attr )
{
if ( fa.at( attr ) != ca.at( attr ) )