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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 "qgsattributeaction.h"
#include "qgis.h" //for globals
#include "qgsapplication.h"
#include "qgscoordinatetransform.h"
#include "qgsdatasourceuri.h"
#include "qgsfeature.h"
#include "qgsfeaturerequest.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgslabel.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgsmaptopixel.h"
#include "qgspoint.h"
#include "qgsproviderregistry.h"
#include "qgsrectangle.h"
#include "qgsrelationmanager.h"
#include "qgsrendercontext.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectordataprovider.h"
#include "qgsgeometrycache.h"
#include "qgsvectorlayereditbuffer.h"
#include "qgsvectorlayereditutils.h"
#include "qgsvectorlayerfeatureiterator.h"
#include "qgsvectorlayerjoinbuffer.h"
#include "qgsvectorlayerundocommand.h"
#include "qgsmaplayerregistry.h"
#include "qgsclipper.h"
#include "qgsproject.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 "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( QString vectorLayerPath,
QString baseName,
QString providerKey,
bool loadDefaultStyleFlag )
: QgsMapLayer( VectorLayer, baseName, vectorLayerPath )
, mUpdateThreshold( 0 ) // XXX better default value?
, mDataProvider( NULL )
, mProviderKey( providerKey )
, mReadOnly( false )
, mRendererV2( NULL )
, mLabel( 0 )
, mLabelOn( false )
, mLabelFontNotFoundNotified( false )
, mFeatureBlendMode( QPainter::CompositionMode_SourceOver ) // Default to normal feature blending
, mLayerTransparency( 0 )
, mVertexMarkerOnlyForSelection( false )
, mFeatureFormSuppress( SuppressDefault )
, mCache( new QgsGeometryCache( this ) )
, mEditBuffer( 0 )
, mJoinBuffer( 0 )
, mDiagramRenderer( 0 )
, mDiagramLayerSettings( 0 )
, mValidExtent( false )
, mSymbolFeatureCounted( false )
, mCurrentRendererContext( 0 )
{
mActions = new QgsAttributeAction( this );
// if we're given a provider type, try to create and bind one to this layer
if ( ! mProviderKey.isEmpty() )
{
setDataProvider( mProviderKey );
}
if ( mValid )
{
// Always set crs
setCoordinateSystem();
// check if there is a default style / propertysheet defined
// for this layer and if so apply it
bool defaultLoadedFlag = false;
if ( loadDefaultStyleFlag )
{
loadDefaultStyle( defaultLoadedFlag );
}
// if the default style failed to load or was disabled use some very basic defaults
if ( !defaultLoadedFlag && hasGeometryType() )
{
// add single symbol renderer
setRendererV2( QgsFeatureRendererV2::defaultRenderer( geometryType() ) );
}
connect( QgsMapLayerRegistry::instance(), SIGNAL( layerWillBeRemoved( QString ) ), this, SLOT( checkJoinLayerRemove( QString ) ) );
// Get the update threshold from user settings. We
// do this only on construction to avoid the penality of
// fetching this each time the layer is drawn. If the user
// changes the threshold from the preferences dialog, it will
// have no effect on existing layers
// TODO: load this setting somewhere else [MD]
//QSettings settings;
//mUpdateThreshold = settings.readNumEntry("Map/updateThreshold", 1000);
}
connect( this, SIGNAL( selectionChanged( QgsFeatureIds, QgsFeatureIds, bool ) ), this, SIGNAL( selectionChanged() ) );
connect( QgsProject::instance()->relationManager(), SIGNAL( relationsLoaded() ), this, SLOT( onRelationsLoaded() ) );
// Default simplify drawing settings
QSettings settings;
mSimplifyMethod.setSimplifyHints( settings.value( "/qgis/simplifyDrawingHints", mSimplifyMethod.simplifyHints() ).toInt() );
mSimplifyMethod.setThreshold( settings.value( "/qgis/simplifyDrawingTol", mSimplifyMethod.threshold() ).toFloat() );
mSimplifyMethod.setForceLocalOptimization( settings.value( "/qgis/simplifyLocal", mSimplifyMethod.forceLocalOptimization() ).toBool() );
} // QgsVectorLayer ctor
QgsVectorLayer::~QgsVectorLayer()
{
QgsDebugMsg( "entered." );
emit layerDeleted();
mValid = false;
delete mDataProvider;
delete mEditBuffer;
delete mJoinBuffer;
delete mCache;
delete mLabel;
delete mDiagramLayerSettings;
delete mActions;
delete mRendererV2;
}
QString QgsVectorLayer::storageType() const
{
if ( mDataProvider )
{
return mDataProvider->storageType();
}
return 0;
}
QString QgsVectorLayer::capabilitiesString() const
{
if ( mDataProvider )
{
return mDataProvider->capabilitiesString();
}
return 0;
}
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( 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
{
const QgsFields &fields = pendingFields();
int fieldsSize = fields.size();
for ( int idx = 0; idx < fields.count(); ++idx )
{
QString fldName = fields[idx].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 = fields[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->scaleBasedVisibility() ||
( mLabel->minScale() <= rendererContext.rendererScale() &&
rendererContext.rendererScale() <= mLabel->maxScale() ) ) )
{
QgsAttributeList attributes;
foreach ( QString attrName, mRendererV2->usedAttributes() )
{
int attrNum = fieldNameIndex( attrName );
attributes.append( attrNum );
}
// make sure the renderer is ready for classification ("symbolForFeature")
mRendererV2->startRender( rendererContext, this );
// 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 ) )
{
bool sel = mSelectedFeatureIds.contains( fet.id() );
mLabel->renderLabel( rendererContext, fet, sel, 0 );
}
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 ) );
// XXX Something in our draw event is triggering an additional draw event when resizing [TE 01/26/06]
// XXX Calling this will begin processing the next draw event causing image havoc and recursion crashes.
//qApp->processEvents();
}
}
void QgsVectorLayer::drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling )
{
if ( !hasGeometryType() )
return;
mCurrentRendererContext = &rendererContext;
QSettings settings;
bool vertexMarkerOnlyForSelection = settings.value( "/qgis/digitizing/marker_only_for_selected", false ).toBool();
#ifndef Q_WS_MAC
int featureCount = 0;
#endif //Q_WS_MAC
QgsFeature fet;
while ( fit.nextFeature( fet ) )
{
try
{
if ( !fet.geometry() )
continue; // skip features without geometry
#ifndef Q_WS_MAC //MH: disable this on Mac for now to avoid problems with resizing
#ifdef Q_WS_X11
if ( !mEnableBackbuffer ) // do not handle events, as we're already inside a paint event
{
#endif // Q_WS_X11
if ( mUpdateThreshold > 0 && 0 == featureCount % mUpdateThreshold )
{
emit screenUpdateRequested();
// emit drawingProgress( featureCount, totalFeatures );
qApp->processEvents();
}
else if ( featureCount % 1000 == 0 )
{
// emit drawingProgress( featureCount, totalFeatures );
qApp->processEvents();
}
#ifdef Q_WS_X11
}
#endif // Q_WS_X11
#endif // Q_WS_MAC
if ( rendererContext.renderingStopped() )
{
break;
}
bool sel = mSelectedFeatureIds.contains( fet.id() );
bool drawMarker = ( mEditBuffer && ( !vertexMarkerOnlyForSelection || sel ) );
// render feature
bool rendered = mRendererV2->renderFeature( fet, rendererContext, -1, sel, drawMarker );
if ( mEditBuffer )
{
// Cache this for the use of (e.g.) modifying the feature's uncommitted geometry.
mCache->cacheGeometry( fet.id(), *fet.geometry() );
}
// labeling - register feature
if ( rendered && rendererContext.labelingEngine() )
{
if ( labeling )
{
rendererContext.labelingEngine()->registerFeature( this, fet, rendererContext );
}
if ( mDiagramRenderer )
{
rendererContext.labelingEngine()->registerDiagramFeature( this, fet, rendererContext );
}
}
}
catch ( const QgsCsException &cse )
{
Q_UNUSED( cse );
QgsDebugMsg( QString( "Failed to transform a point while drawing a feature with ID '%1'. Ignoring this feature. %2" )
.arg( fet.id() ).arg( cse.what() ) );
}
#ifndef Q_WS_MAC
++featureCount;
#endif //Q_WS_MAC
}
stopRendererV2( rendererContext, NULL );
mCurrentRendererContext = NULL;
#ifndef Q_WS_MAC
QgsDebugMsg( QString( "Total features processed %1" ).arg( featureCount ) );
#endif
}
void QgsVectorLayer::drawRendererV2Levels( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling )
{
if ( !hasGeometryType() )
return;
QHash< QgsSymbolV2*, QList<QgsFeature> > features; // key = symbol, value = array of features
QSettings settings;
bool vertexMarkerOnlyForSelection = settings.value( "/qgis/digitizing/marker_only_for_selected", false ).toBool();
QgsSingleSymbolRendererV2* selRenderer = NULL;
if ( !mSelectedFeatureIds.isEmpty() )
{
selRenderer = new QgsSingleSymbolRendererV2( QgsSymbolV2::defaultSymbol( geometryType() ) );
selRenderer->symbol()->setColor( rendererContext.selectionColor() );
selRenderer->setVertexMarkerAppearance( currentVertexMarkerType(), currentVertexMarkerSize() );
selRenderer->startRender( rendererContext, this );
}
// 1. fetch features
QgsFeature fet;
#ifndef Q_WS_MAC
int featureCount = 0;
#endif //Q_WS_MAC
while ( fit.nextFeature( fet ) )
{
if ( !fet.geometry() )
continue; // skip features without geometry
if ( rendererContext.renderingStopped() )
{
stopRendererV2( rendererContext, selRenderer );
return;
}
#ifndef Q_WS_MAC
if ( featureCount % 1000 == 0 )
{
qApp->processEvents();
}
#endif //Q_WS_MAC
QgsSymbolV2* sym = mRendererV2->symbolForFeature( fet );
if ( !sym )
{
continue;
}
if ( !features.contains( sym ) )
{
features.insert( sym, QList<QgsFeature>() );
}
features[sym].append( fet );
if ( mEditBuffer )
{
// Cache this for the use of (e.g.) modifying the feature's uncommitted geometry.
mCache->cacheGeometry( fet.id(), *fet.geometry() );
}
if ( sym && rendererContext.labelingEngine() )
{
if ( labeling )
{
rendererContext.labelingEngine()->registerFeature( this, fet, rendererContext );
}
if ( mDiagramRenderer )
{
rendererContext.labelingEngine()->registerDiagramFeature( this, fet, rendererContext );
}
}
#ifndef Q_WS_MAC
++featureCount;
#endif //Q_WS_MAC
}
// find out the order
QgsSymbolV2LevelOrder levels;
QgsSymbolV2List symbols = mRendererV2->symbols();
for ( int i = 0; i < symbols.count(); i++ )
{
QgsSymbolV2* sym = symbols[i];
for ( int j = 0; j < sym->symbolLayerCount(); j++ )
{
int level = sym->symbolLayer( j )->renderingPass();
if ( level < 0 || level >= 1000 ) // ignore invalid levels
continue;
QgsSymbolV2LevelItem item( sym, j );
while ( level >= levels.count() ) // append new empty levels
levels.append( QgsSymbolV2Level() );
levels[level].append( item );
}
}
// 2. draw features in correct order
for ( int l = 0; l < levels.count(); l++ )
{
QgsSymbolV2Level& level = levels[l];
for ( int i = 0; i < level.count(); i++ )
{
QgsSymbolV2LevelItem& item = level[i];
if ( !features.contains( item.symbol() ) )
{
QgsDebugMsg( "level item's symbol not found!" );
continue;
}
int layer = item.layer();
QList<QgsFeature>& lst = features[item.symbol()];
QList<QgsFeature>::iterator fit;
#ifndef Q_WS_MAC
featureCount = 0;
#endif //Q_WS_MAC
for ( fit = lst.begin(); fit != lst.end(); ++fit )
{
if ( rendererContext.renderingStopped() )
{
stopRendererV2( rendererContext, selRenderer );
return;
}
#ifndef Q_WS_MAC
if ( featureCount % 1000 == 0 )
{
qApp->processEvents();
}
#endif //Q_WS_MAC
bool sel = mSelectedFeatureIds.contains( fit->id() );
// maybe vertex markers should be drawn only during the last pass...
bool drawMarker = ( mEditBuffer && ( !vertexMarkerOnlyForSelection || sel ) );
try
{
mRendererV2->renderFeature( *fit, rendererContext, layer, sel, drawMarker );
}
catch ( const QgsCsException &cse )
{
Q_UNUSED( cse );
QgsDebugMsg( QString( "Failed to transform a point while drawing a feature with ID '%1'. Ignoring this feature. %2" )
.arg( fet.id() ).arg( cse.what() ) );
}
#ifndef Q_WS_MAC
++featureCount;
#endif //Q_WS_MAC
}
}
}
stopRendererV2( rendererContext, selRenderer );
}
void QgsVectorLayer::reload()
{
if ( mDataProvider )
{
mDataProvider->reloadData();
}
}
bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
{
if ( !hasGeometryType() )
return true;
//set update threshold before each draw to make sure the current setting is picked up
QSettings settings;
mUpdateThreshold = settings.value( "Map/updateThreshold", 0 ).toInt();
// users could accidently set updateThreshold threshold to a small value
// and complain about bad performance -> force min 1000 here
if ( mUpdateThreshold > 0 && mUpdateThreshold < 1000 )
{
mUpdateThreshold = 1000;
}
#ifdef Q_WS_X11
mEnableBackbuffer = settings.value( "/Map/enableBackbuffer", 1 ).toBool();
#endif
if ( !mRendererV2 )
return false;
QgsDebugMsg( "rendering v2:\n" + mRendererV2->dump() );
if ( mEditBuffer )
{
// Destroy all cached geometries and clear the references to them
mCache->deleteCachedGeometries();
mCache->setCachedGeometriesRect( rendererContext.extent() );
// set editing vertex markers style
mRendererV2->setVertexMarkerAppearance( currentVertexMarkerType(), currentVertexMarkerSize() );
}
QgsAttributeList attributes;
foreach ( QString attrName, mRendererV2->usedAttributes() )
{
int attrNum = fieldNameIndex( attrName );
attributes.append( attrNum );
QgsDebugMsg( "attrs: " + attrName + " - " + QString::number( attrNum ) );
}
bool labeling = false;
//register label and diagram layer to the labeling engine
prepareLabelingAndDiagrams( rendererContext, attributes, labeling );
//do startRender before getFeatures to give renderers the possibility of querying features in the startRender method
mRendererV2->startRender( rendererContext, this );
QgsFeatureRequest& featureRequest = QgsFeatureRequest()
.setFilterRect( rendererContext.extent() )
.setSubsetOfAttributes( attributes );
// enable the simplification of the geometries (Using the current map2pixel context) before send it to renderer engine.
if ( simplifyDrawingCanbeApplied( QgsVectorLayer::GeometrySimplification ) )
{
QPainter* p = rendererContext.painter();
double dpi = ( p->device()->logicalDpiX() + p->device()->logicalDpiY() ) / 2;
double map2pixelTol = mSimplifyMethod.threshold() * 96.0f / dpi;
const QgsMapToPixel& mtp = rendererContext.mapToPixel();
map2pixelTol *= mtp.mapUnitsPerPixel();
const QgsCoordinateTransform* ct = rendererContext.coordinateTransform();
// resize the tolerance using the change of size of an 1-BBOX from the source CoordinateSystem to the target CoordinateSystem
if ( ct && !(( QgsCoordinateTransform* )ct )->isShortCircuited() )
{
QgsPoint center = rendererContext.extent().center();
double rectSize = ct->sourceCrs().geographicFlag() ? 0.0008983 /* ~100/(40075014/360=111319.4833) */ : 100;
QgsRectangle sourceRect = QgsRectangle( center.x(), center.y(), center.x() + rectSize, center.y() + rectSize );
QgsRectangle targetRect = ct->transform( sourceRect );
QgsPoint minimumSrcPoint( sourceRect.xMinimum(), sourceRect.yMinimum() );
QgsPoint maximumSrcPoint( sourceRect.xMaximum(), sourceRect.yMaximum() );
QgsPoint minimumDstPoint( targetRect.xMinimum(), targetRect.yMinimum() );
QgsPoint maximumDstPoint( targetRect.xMaximum(), targetRect.yMaximum() );
double sourceHypothenuse = sqrt( minimumSrcPoint.sqrDist( maximumSrcPoint ) );
double targetHypothenuse = sqrt( minimumDstPoint.sqrDist( maximumDstPoint ) );
if ( sourceHypothenuse != 0 )
map2pixelTol *= targetHypothenuse / sourceHypothenuse;
}
QgsSimplifyMethod simplifyMethod;
simplifyMethod.setMethodType( QgsSimplifyMethod::OptimizeForRendering );
simplifyMethod.setTolerance( map2pixelTol );
simplifyMethod.setForceLocalOptimization( mSimplifyMethod.forceLocalOptimization() );
// fix simplification non supported on server side
if ( !simplifyMethod.forceLocalOptimization() && !( mDataProvider->capabilities() & QgsVectorDataProvider::SimplifyGeometries ) )
{
QgsDebugMsg( "Data provider does not support geometry simplification on provider side" );
simplifyMethod.setForceLocalOptimization( true );
}
featureRequest.setSimplifyMethod( simplifyMethod );
}
QgsFeatureIterator fit = getFeatures( featureRequest );
if (( mRendererV2->capabilities() & QgsFeatureRendererV2::SymbolLevels ) && mRendererV2->usingSymbolLevels() )
drawRendererV2Levels( fit, rendererContext, labeling );
else
drawRendererV2( fit, rendererContext, labeling );
return true;
}
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( const QgsFeatureId& fid )
{
mSelectedFeatureIds.insert( fid );
setCacheImage( 0 );
emit selectionChanged( QgsFeatureIds() << fid, QgsFeatureIds(), false );
}
void QgsVectorLayer::select( const QgsFeatureIds& featureIds )
{
mSelectedFeatureIds.unite( featureIds );
setCacheImage( 0 );
emit selectionChanged( featureIds, QgsFeatureIds(), false );
}
void QgsVectorLayer::deselect( const QgsFeatureId fid )
{
mSelectedFeatureIds.remove( fid );
setCacheImage( 0 );
emit selectionChanged( QgsFeatureIds(), QgsFeatureIds() << fid, false );
}
void QgsVectorLayer::deselect( const QgsFeatureIds& featureIds )
{
mSelectedFeatureIds.subtract( featureIds );
setCacheImage( 0 );
emit selectionChanged( QgsFeatureIds(), featureIds, false );
}
void QgsVectorLayer::select( QgsRectangle & rect, bool addToSelection )
{
// normalize the rectangle
rect.normalize();
//select all the elements
QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
.setFilterRect( rect )
.setFlags( QgsFeatureRequest::ExactIntersect | QgsFeatureRequest::NoGeometry )
.setSubsetOfAttributes( QgsAttributeList() ) );
QgsFeatureIds ids;
QgsFeature f;
while ( fit.nextFeature( f ) )
{
ids << f.id();
}
if ( !addToSelection )
{
setSelectedFeatures( mSelectedFeatureIds + ids );
}
else
{
select( ids );
}
}
void QgsVectorLayer::modifySelection( QgsFeatureIds selectIds, QgsFeatureIds deselectIds )
{
QgsFeatureIds intersectingIds = selectIds & deselectIds;
if ( intersectingIds.count() > 0 )
{
QgsDebugMsg( "Trying to select and deselect the same item at the same time. Unsure what to do. Selecting dubious items." );
}
mSelectedFeatureIds -= deselectIds;
mSelectedFeatureIds += selectIds;
setCacheImage( 0 );
emit selectionChanged( selectIds, deselectIds - intersectingIds, false );
}
void QgsVectorLayer::invertSelection()
{
QgsFeatureIds ids = allFeatureIds();
ids.subtract( mSelectedFeatureIds );
setSelectedFeatures( ids );
}
void QgsVectorLayer::selectAll()
{
setSelectedFeatures( 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.size() == 0 )
return;
setSelectedFeatures( QgsFeatureIds() );
}
void QgsVectorLayer::triggerRepaint()
{
emit repaintRequested();
}
QgsVectorDataProvider* QgsVectorLayer::dataProvider()
{
return mDataProvider;
}
const QgsVectorDataProvider* QgsVectorLayer::dataProvider() const
{
return mDataProvider;
}
void QgsVectorLayer::setProviderEncoding( const QString& encoding )
{
if ( mDataProvider )
{
mDataProvider->setEncoding( encoding );
updateFields();
}
}
void QgsVectorLayer::setDiagramRenderer( QgsDiagramRendererV2* r )
{
delete mDiagramRenderer;
mDiagramRenderer = r;
}
QGis::GeometryType QgsVectorLayer::geometryType() const
{
if ( mDataProvider )
{
int type = mDataProvider->geometryType();
switch ( type )
{
case QGis::WKBPoint:
case QGis::WKBPoint25D:
return QGis::Point;
case QGis::WKBLineString:
case QGis::WKBLineString25D:
return QGis::Line;
case QGis::WKBPolygon:
case QGis::WKBPolygon25D:
return QGis::Polygon;
case QGis::WKBMultiPoint:
case QGis::WKBMultiPoint25D:
return QGis::Point;
case QGis::WKBMultiLineString:
case QGis::WKBMultiLineString25D:
return QGis::Line;
case QGis::WKBMultiPolygon:
case QGis::WKBMultiPolygon25D:
return QGis::Polygon;
case QGis::WKBNoGeometry:
return QGis::NoGeometry;
}
QgsDebugMsg( QString( "Data Provider Geometry type is not recognised, is %1" ).arg( type ) );
}
else
{
QgsDebugMsg( "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