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qgsexpressioncontextutils.cpp
1282 lines (1029 loc) · 52.4 KB
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qgsexpressioncontextutils.cpp
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/***************************************************************************
qgsexpressioncontextutils.cpp
------------------------
Date : April 2015
Copyright : (C) 2015 by Nyall Dawson
Email : nyall dot dawson at gmail dot com
***************************************************************************
* *
* 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 "qgsexpressioncontextutils.h"
#include "qgsapplication.h"
#include "qgsvectorlayer.h"
#include "qgsproject.h"
#include "qgsexpression.h"
#include "qgsprocessingcontext.h"
#include "qgsprocessingmodelalgorithm.h"
#include "qgsprocessingalgorithm.h"
#include "qgsmapsettings.h"
#include "qgssymbollayerutils.h"
#include "qgslayout.h"
#include "qgslayoutitem.h"
#include "qgsexpressionutils.h"
#include "qgslayoutpagecollection.h"
#include "qgslayoutatlas.h"
#include "qgslayoutmultiframe.h"
#include "qgsfeatureid.h"
#include "qgslayoutitemmap.h"
#include "qgsmaplayerlistutils.h"
#include "qgsprojoperation.h"
#include "qgsmarkersymbol.h"
#include "qgstriangularmesh.h"
QgsExpressionContextScope *QgsExpressionContextUtils::globalScope()
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Global" ) );
const QVariantMap customVariables = QgsApplication::customVariables();
for ( QVariantMap::const_iterator it = customVariables.constBegin(); it != customVariables.constEnd(); ++it )
{
scope->setVariable( it.key(), it.value(), true );
}
//add some extra global variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_version" ), Qgis::version(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_version_no" ), Qgis::versionInt(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_short_version" ), QStringLiteral( "%1.%2" ).arg( Qgis::versionInt() / 10000 ).arg( Qgis::versionInt() / 100 % 100 ), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_release_name" ), Qgis::releaseName(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_platform" ), QgsApplication::platform(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_os_name" ), QgsApplication::osName(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "qgis_locale" ), QgsApplication::locale(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "user_account_name" ), QgsApplication::userLoginName(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "user_full_name" ), QgsApplication::userFullName(), true, true ) );
return scope;
}
void QgsExpressionContextUtils::setGlobalVariable( const QString &name, const QVariant &value )
{
QgsApplication::setCustomVariable( name, value );
}
void QgsExpressionContextUtils::setGlobalVariables( const QVariantMap &variables )
{
QgsApplication::setCustomVariables( variables );
}
void QgsExpressionContextUtils::removeGlobalVariable( const QString &name )
{
QVariantMap vars = QgsApplication::customVariables();
if ( vars.remove( name ) )
QgsApplication::setCustomVariables( vars );
}
/// @cond PRIVATE
class GetLayoutItemVariables : public QgsScopedExpressionFunction
{
public:
GetLayoutItemVariables( const QgsLayout *c )
: QgsScopedExpressionFunction( QStringLiteral( "item_variables" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "id" ) ), QStringLiteral( "Layout" ) )
, mLayout( c )
{}
QVariant func( const QVariantList &values, const QgsExpressionContext *, QgsExpression *, const QgsExpressionNodeFunction * ) override
{
if ( !mLayout )
return QVariant();
const QString id = values.at( 0 ).toString();
const QgsLayoutItem *item = mLayout->itemById( id );
if ( !item )
return QVariant();
const QgsExpressionContext c = item->createExpressionContext();
return c.variablesToMap();
}
QgsScopedExpressionFunction *clone() const override
{
return new GetLayoutItemVariables( mLayout );
}
private:
const QgsLayout *mLayout = nullptr;
};
class GetLayoutMapLayerCredits : public QgsScopedExpressionFunction
{
public:
GetLayoutMapLayerCredits( const QgsLayout *c )
: QgsScopedExpressionFunction( QStringLiteral( "map_credits" ),
QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "id" ) )
<< QgsExpressionFunction::Parameter( QStringLiteral( "include_layer_names" ), true, false )
<< QgsExpressionFunction::Parameter( QStringLiteral( "layer_name_separator" ), true, QStringLiteral( ": " ) ), QStringLiteral( "Layout" ) )
, mLayout( c )
{}
QVariant func( const QVariantList &values, const QgsExpressionContext *, QgsExpression *, const QgsExpressionNodeFunction * ) override
{
if ( !mLayout )
return QVariant();
const QString id = values.value( 0 ).toString();
if ( QgsLayoutItemMap *map = qobject_cast< QgsLayoutItemMap * >( mLayout->itemById( id ) ) )
{
const QgsExpressionContext c = map->createExpressionContext();
const QVariantList mapLayers = c.variable( QStringLiteral( "map_layers" ) ).toList();
const bool includeLayerNames = values.value( 1 ).toBool();
const QString layerNameSeparator = values.value( 2 ).toString();
QVariantList res;
for ( const QVariant &value : mapLayers )
{
if ( const QgsMapLayer *layer = qobject_cast< const QgsMapLayer * >( value.value< QObject * >() ) )
{
const QStringList credits = !layer->metadata().rights().isEmpty() ? layer->metadata().rights() : QStringList() << layer->attribution();
for ( const QString &credit : credits )
{
if ( credit.trimmed().isEmpty() )
continue;
const QString creditString = includeLayerNames ? layer->name() + layerNameSeparator + credit
: credit;
if ( !res.contains( creditString ) )
res << creditString;
}
}
}
return res;
}
return QVariant();
}
QgsScopedExpressionFunction *clone() const override
{
return new GetLayoutMapLayerCredits( mLayout );
}
private:
const QgsLayout *mLayout = nullptr;
};
class GetCurrentFormFieldValue : public QgsScopedExpressionFunction
{
public:
GetCurrentFormFieldValue( )
: QgsScopedExpressionFunction( QStringLiteral( "current_value" ), QgsExpressionFunction::ParameterList() << QStringLiteral( "field_name" ), QStringLiteral( "Form" ) )
{}
QVariant func( const QVariantList &values, const QgsExpressionContext *context, QgsExpression *, const QgsExpressionNodeFunction * ) override
{
const QString fieldName( values.at( 0 ).toString() );
const QgsFeature feat( context->variable( QStringLiteral( "current_feature" ) ).value<QgsFeature>() );
if ( fieldName.isEmpty() || ! feat.isValid( ) )
{
return QVariant();
}
return feat.attribute( fieldName ) ;
}
QgsScopedExpressionFunction *clone() const override
{
return new GetCurrentFormFieldValue( );
}
bool isStatic( const QgsExpressionNodeFunction *, QgsExpression *, const QgsExpressionContext * ) const override
{
return false;
};
};
class GetCurrentParentFormFieldValue : public QgsScopedExpressionFunction
{
public:
GetCurrentParentFormFieldValue( )
: QgsScopedExpressionFunction( QStringLiteral( "current_parent_value" ), QgsExpressionFunction::ParameterList() << QStringLiteral( "field_name" ), QStringLiteral( "Form" ) )
{}
QVariant func( const QVariantList &values, const QgsExpressionContext *context, QgsExpression *, const QgsExpressionNodeFunction * ) override
{
const QString fieldName( values.at( 0 ).toString() );
const QgsFeature feat( context->variable( QStringLiteral( "current_parent_feature" ) ).value<QgsFeature>() );
if ( fieldName.isEmpty() || ! feat.isValid( ) )
{
return QVariant();
}
return feat.attribute( fieldName ) ;
}
QgsScopedExpressionFunction *clone() const override
{
return new GetCurrentParentFormFieldValue( );
}
bool isStatic( const QgsExpressionNodeFunction *, QgsExpression *, const QgsExpressionContext * ) const override
{
return false;
};
};
class GetProcessingParameterValue : public QgsScopedExpressionFunction
{
public:
GetProcessingParameterValue( const QVariantMap ¶ms )
: QgsScopedExpressionFunction( QStringLiteral( "parameter" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "name" ) ), QStringLiteral( "Processing" ) )
, mParams( params )
{}
QVariant func( const QVariantList &values, const QgsExpressionContext *, QgsExpression *, const QgsExpressionNodeFunction * ) override
{
return mParams.value( values.at( 0 ).toString() );
}
QgsScopedExpressionFunction *clone() const override
{
return new GetProcessingParameterValue( mParams );
}
private:
const QVariantMap mParams;
};
///@endcond
QgsExpressionContextScope *QgsExpressionContextUtils::formScope( const QgsFeature &formFeature, const QString &formMode )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Form" ) );
scope->addFunction( QStringLiteral( "current_value" ), new GetCurrentFormFieldValue( ) );
scope->setVariable( QStringLiteral( "current_geometry" ), formFeature.geometry( ), true );
scope->setVariable( QStringLiteral( "current_feature" ), formFeature, true );
scope->setVariable( QStringLiteral( "form_mode" ), formMode, true );
return scope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::parentFormScope( const QgsFeature &parentFormFeature, const QString &parentFormMode )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Parent Form" ) );
scope->addFunction( QStringLiteral( "current_parent_value" ), new GetCurrentParentFormFieldValue( ) );
scope->setVariable( QStringLiteral( "current_parent_geometry" ), parentFormFeature.geometry( ), true );
scope->setVariable( QStringLiteral( "current_parent_feature" ), parentFormFeature, true );
scope->setVariable( QStringLiteral( "parent_form_mode" ), parentFormMode, true );
return scope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::projectScope( const QgsProject *project )
{
if ( !project )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Project" ) );
return scope;
}
else
return project->createExpressionContextScope();
}
void QgsExpressionContextUtils::setProjectVariable( QgsProject *project, const QString &name, const QVariant &value )
{
if ( !project )
return;
QVariantMap vars = project->customVariables();
vars.insert( name, value );
project->setCustomVariables( vars );
}
void QgsExpressionContextUtils::setProjectVariables( QgsProject *project, const QVariantMap &variables )
{
if ( !project )
return;
project->setCustomVariables( variables );
}
void QgsExpressionContextUtils::removeProjectVariable( QgsProject *project, const QString &name )
{
if ( !project )
{
return;
}
QVariantMap vars = project->customVariables();
if ( vars.remove( name ) )
project->setCustomVariables( vars );
}
QgsExpressionContextScope *QgsExpressionContextUtils::layerScope( const QgsMapLayer *layer )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Layer" ) );
if ( !layer )
return scope;
//add variables defined in layer properties
const QStringList variableNames = layer->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
const QStringList variableValues = layer->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
int varIndex = 0;
for ( const QString &variableName : variableNames )
{
if ( varIndex >= variableValues.length() )
{
break;
}
const QVariant varValue = variableValues.at( varIndex );
varIndex++;
scope->setVariable( variableName, varValue, true );
}
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layer_name" ), layer->name(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layer_id" ), layer->id(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "_layer_crs" ), QVariant::fromValue<QgsCoordinateReferenceSystem>( layer->crs() ), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layer_crs" ), layer->crs().authid(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layer" ), QVariant::fromValue<QgsWeakMapLayerPointer >( QgsWeakMapLayerPointer( const_cast<QgsMapLayer *>( layer ) ) ), true, true ) );
const QgsVectorLayer *vLayer = qobject_cast< const QgsVectorLayer * >( layer );
if ( vLayer )
{
scope->setFields( vLayer->fields() );
}
//TODO - add functions. Possibilities include:
//is_selected
//field summary stats
return scope;
}
QList<QgsExpressionContextScope *> QgsExpressionContextUtils::globalProjectLayerScopes( const QgsMapLayer *layer )
{
QList<QgsExpressionContextScope *> scopes;
scopes << globalScope();
QgsProject *project = QgsProject::instance(); // TODO: use project associated with layer
if ( project )
scopes << projectScope( project );
if ( layer )
scopes << layerScope( layer );
return scopes;
}
void QgsExpressionContextUtils::setLayerVariable( QgsMapLayer *layer, const QString &name, const QVariant &value )
{
if ( !layer )
return;
//write variable to layer
QStringList variableNames = layer->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
QStringList variableValues = layer->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
variableNames << name;
variableValues << value.toString();
layer->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
layer->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
void QgsExpressionContextUtils::setLayerVariables( QgsMapLayer *layer, const QVariantMap &variables )
{
if ( !layer )
return;
QStringList variableNames;
QStringList variableValues;
QVariantMap::const_iterator it = variables.constBegin();
for ( ; it != variables.constEnd(); ++it )
{
variableNames << it.key();
variableValues << it.value().toString();
}
layer->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
layer->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
QgsExpressionContextScope *QgsExpressionContextUtils::mapSettingsScope( const QgsMapSettings &mapSettings )
{
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
// and because people don't read that ^^, I'm going to blast it all over this function
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Map Settings" ) );
//add known map settings context variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_id" ), "canvas", true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_rotation" ), mapSettings.rotation(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_scale" ), mapSettings.scale(), true ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
const QgsGeometry extent = QgsGeometry::fromRect( mapSettings.visibleExtent() );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_extent" ), QVariant::fromValue( extent ), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_extent_width" ), mapSettings.visibleExtent().width(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_extent_height" ), mapSettings.visibleExtent().height(), true ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
const QgsGeometry centerPoint = QgsGeometry::fromPointXY( mapSettings.visibleExtent().center() );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_extent_center" ), QVariant::fromValue( centerPoint ), true ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs" ), mapSettings.destinationCrs().authid(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_definition" ), mapSettings.destinationCrs().toProj(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_units" ), QgsUnitTypes::toString( mapSettings.mapUnits() ), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_description" ), mapSettings.destinationCrs().description(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_acronym" ), mapSettings.destinationCrs().projectionAcronym(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_projection" ), mapSettings.destinationCrs().operation().description(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_ellipsoid" ), mapSettings.destinationCrs().ellipsoidAcronym(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_proj4" ), mapSettings.destinationCrs().toProj(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_crs_wkt" ), mapSettings.destinationCrs().toWkt( QgsCoordinateReferenceSystem::WKT_PREFERRED ), true ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
QVariantList layersIds;
QVariantList layers;
const QList<QgsMapLayer *> layersInMap = mapSettings.layers( true );
layersIds.reserve( layersInMap.count() );
layers.reserve( layersInMap.count() );
for ( QgsMapLayer *layer : layersInMap )
{
layersIds << layer->id();
layers << QVariant::fromValue<QgsWeakMapLayerPointer>( QgsWeakMapLayerPointer( layer ) );
}
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_layer_ids" ), layersIds, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_layers" ), layers, true ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
scope->addFunction( QStringLiteral( "is_layer_visible" ), new GetLayerVisibility( mapSettings.layers( true ), mapSettings.scale() ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_start_time" ), mapSettings.isTemporal() ? mapSettings.temporalRange().begin() : QVariant(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_end_time" ), mapSettings.isTemporal() ? mapSettings.temporalRange().end() : QVariant(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "map_interval" ), mapSettings.isTemporal() ? ( mapSettings.temporalRange().end() - mapSettings.temporalRange().begin() ) : QVariant(), true ) );
// IMPORTANT: ANY CHANGES HERE ALSO NEED TO BE MADE TO QgsLayoutItemMap::createExpressionContext()
// (rationale is described in QgsLayoutItemMap::createExpressionContext() )
return scope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::mapToolCaptureScope( const QList<QgsPointLocator::Match> &matches )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Map Tool Capture" ) );
QVariantList matchList;
for ( const QgsPointLocator::Match &match : matches )
{
QVariantMap matchMap;
matchMap.insert( QStringLiteral( "valid" ), match.isValid() );
matchMap.insert( QStringLiteral( "layer" ), QVariant::fromValue<QgsWeakMapLayerPointer>( QgsWeakMapLayerPointer( match.layer() ) ) );
matchMap.insert( QStringLiteral( "feature_id" ), match.featureId() );
matchMap.insert( QStringLiteral( "vertex_index" ), match.vertexIndex() );
matchMap.insert( QStringLiteral( "distance" ), match.distance() );
matchList.append( matchMap );
}
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "snapping_results" ), matchList ) );
return scope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::updateSymbolScope( const QgsSymbol *symbol, QgsExpressionContextScope *symbolScope )
{
if ( !symbolScope )
return nullptr;
symbolScope->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_SYMBOL_COLOR, symbol ? symbol->color() : QColor(), true ) );
double angle = 0.0;
const QgsMarkerSymbol *markerSymbol = dynamic_cast< const QgsMarkerSymbol * >( symbol );
if ( markerSymbol )
{
angle = markerSymbol->angle();
}
symbolScope->addVariable( QgsExpressionContextScope::StaticVariable( QgsExpressionContext::EXPR_SYMBOL_ANGLE, angle, true ) );
return symbolScope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::layoutScope( const QgsLayout *layout )
{
std::unique_ptr< QgsExpressionContextScope > scope( new QgsExpressionContextScope( QObject::tr( "Layout" ) ) );
if ( !layout )
return scope.release();
//add variables defined in layout properties
const QStringList variableNames = layout->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
const QStringList variableValues = layout->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
int varIndex = 0;
for ( const QString &variableName : variableNames )
{
if ( varIndex >= variableValues.length() )
{
break;
}
const QVariant varValue = variableValues.at( varIndex );
varIndex++;
scope->setVariable( variableName, varValue );
}
//add known layout context variables
if ( const QgsMasterLayoutInterface *l = dynamic_cast< const QgsMasterLayoutInterface * >( layout ) )
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_name" ), l->name(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_numpages" ), layout->pageCollection()->pageCount(), true ) );
if ( layout->pageCollection()->pageCount() > 0 )
{
// just take first page size
const QSizeF s = layout->pageCollection()->page( 0 )->sizeWithUnits().toQSizeF();
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pageheight" ), s.height(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pagewidth" ), s.width(), true ) );
}
QVariantList offsets;
for ( int i = 0; i < layout->pageCollection()->pageCount(); i++ )
{
const QPointF p = layout->pageCollection()->pagePositionToLayoutPosition( i, QgsLayoutPoint( 0, 0 ) );
offsets << p.y();
}
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pageoffsets" ), offsets, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_dpi" ), layout->renderContext().dpi(), true ) );
scope->addFunction( QStringLiteral( "item_variables" ), new GetLayoutItemVariables( layout ) );
scope->addFunction( QStringLiteral( "map_credits" ), new GetLayoutMapLayerCredits( layout ) );
if ( layout->reportContext().layer() )
{
scope->setFields( layout->reportContext().layer()->fields() );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_layerid" ), layout->reportContext().layer()->id(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_layername" ), layout->reportContext().layer()->name(), true ) );
}
if ( layout->reportContext().feature().isValid() )
{
const QgsFeature atlasFeature = layout->reportContext().feature();
scope->setFeature( atlasFeature );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_feature" ), QVariant::fromValue( atlasFeature ), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_featureid" ), FID_IS_NULL( atlasFeature.id() ) ? QVariant() : atlasFeature.id(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_geometry" ), QVariant::fromValue( atlasFeature.geometry() ), true ) );
}
return scope.release();
}
void QgsExpressionContextUtils::setLayoutVariable( QgsLayout *layout, const QString &name, const QVariant &value )
{
if ( !layout )
return;
//write variable to layout
QStringList variableNames = layout->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
QStringList variableValues = layout->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
variableNames << name;
variableValues << value.toString();
layout->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
layout->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
void QgsExpressionContextUtils::setLayoutVariables( QgsLayout *layout, const QVariantMap &variables )
{
if ( !layout )
return;
QStringList variableNames;
QStringList variableValues;
QVariantMap::const_iterator it = variables.constBegin();
for ( ; it != variables.constEnd(); ++it )
{
variableNames << it.key();
variableValues << it.value().toString();
}
layout->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
layout->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
QgsExpressionContextScope *QgsExpressionContextUtils::atlasScope( const QgsLayoutAtlas *atlas )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Atlas" ) );
if ( !atlas )
{
//add some dummy atlas variables. This is done so that as in certain contexts we want to show
//users that these variables are available even if they have no current value
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_pagename" ), QString(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_feature" ), QVariant::fromValue( QgsFeature() ), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_featureid" ), QVariant(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_geometry" ), QVariant::fromValue( QgsGeometry() ), true, true ) );
return scope;
}
//add known atlas variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_totalfeatures" ), atlas->count(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_featurenumber" ), atlas->currentFeatureNumber() + 1, true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_filename" ), atlas->currentFilename(), true, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_pagename" ), atlas->nameForPage( atlas->currentFeatureNumber() ), true, true ) );
if ( atlas->enabled() && atlas->coverageLayer() )
{
scope->setFields( atlas->coverageLayer()->fields() );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_layerid" ), atlas->coverageLayer()->id(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_layername" ), atlas->coverageLayer()->name(), true ) );
}
if ( atlas->enabled() )
{
const QgsFeature atlasFeature = atlas->layout()->reportContext().feature();
scope->setFeature( atlasFeature );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_feature" ), QVariant::fromValue( atlasFeature ), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_featureid" ), FID_IS_NULL( atlasFeature.id() ) ? QVariant() : atlasFeature.id(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "atlas_geometry" ), QVariant::fromValue( atlasFeature.geometry() ), true ) );
}
return scope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::layoutItemScope( const QgsLayoutItem *item )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Layout Item" ) );
if ( !item )
return scope;
//add variables defined in layout item properties
const QStringList variableNames = item->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
const QStringList variableValues = item->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
int varIndex = 0;
for ( const QString &variableName : variableNames )
{
if ( varIndex >= variableValues.length() )
{
break;
}
const QVariant varValue = variableValues.at( varIndex );
varIndex++;
scope->setVariable( variableName, varValue );
}
//add known layout item context variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "item_id" ), item->id(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "item_uuid" ), item->uuid(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_page" ), item->page() + 1, true ) );
if ( item->layout() )
{
const QgsLayoutItemPage *page = item->layout()->pageCollection()->page( item->page() );
if ( page )
{
const QSizeF s = page->sizeWithUnits().toQSizeF();
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pageheight" ), s.height(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pagewidth" ), s.width(), true ) );
}
else
{
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pageheight" ), QVariant(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "layout_pagewidth" ), QVariant(), true ) );
}
}
return scope;
}
void QgsExpressionContextUtils::setLayoutItemVariable( QgsLayoutItem *item, const QString &name, const QVariant &value )
{
if ( !item )
return;
//write variable to layout item
QStringList variableNames = item->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
QStringList variableValues = item->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
variableNames << name;
variableValues << value.toString();
item->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
item->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
void QgsExpressionContextUtils::setLayoutItemVariables( QgsLayoutItem *item, const QVariantMap &variables )
{
if ( !item )
return;
QStringList variableNames;
QStringList variableValues;
QVariantMap::const_iterator it = variables.constBegin();
for ( ; it != variables.constEnd(); ++it )
{
variableNames << it.key();
variableValues << it.value().toString();
}
item->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
item->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
QgsExpressionContextScope *QgsExpressionContextUtils::multiFrameScope( const QgsLayoutMultiFrame *frame )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Multiframe Item" ) );
if ( !frame )
return scope;
//add variables defined in layout item properties
const QStringList variableNames = frame->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
const QStringList variableValues = frame->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
int varIndex = 0;
for ( const QString &variableName : variableNames )
{
if ( varIndex >= variableValues.length() )
{
break;
}
const QVariant varValue = variableValues.at( varIndex );
varIndex++;
scope->setVariable( variableName, varValue );
}
return scope;
}
void QgsExpressionContextUtils::setLayoutMultiFrameVariable( QgsLayoutMultiFrame *frame, const QString &name, const QVariant &value )
{
if ( !frame )
return;
//write variable to layout multiframe
QStringList variableNames = frame->customProperty( QStringLiteral( "variableNames" ) ).toStringList();
QStringList variableValues = frame->customProperty( QStringLiteral( "variableValues" ) ).toStringList();
variableNames << name;
variableValues << value.toString();
frame->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
frame->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
void QgsExpressionContextUtils::setLayoutMultiFrameVariables( QgsLayoutMultiFrame *frame, const QVariantMap &variables )
{
if ( !frame )
return;
QStringList variableNames;
QStringList variableValues;
QVariantMap::const_iterator it = variables.constBegin();
for ( ; it != variables.constEnd(); ++it )
{
variableNames << it.key();
variableValues << it.value().toString();
}
frame->setCustomProperty( QStringLiteral( "variableNames" ), variableNames );
frame->setCustomProperty( QStringLiteral( "variableValues" ), variableValues );
}
QgsExpressionContext QgsExpressionContextUtils::createFeatureBasedContext( const QgsFeature &feature, const QgsFields &fields )
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope();
scope->setFeature( feature );
scope->setFields( fields );
return QgsExpressionContext() << scope;
}
QgsExpressionContextScope *QgsExpressionContextUtils::processingAlgorithmScope( const QgsProcessingAlgorithm *algorithm, const QVariantMap ¶meters, QgsProcessingContext &context )
{
// set aside for future use
Q_UNUSED( context )
std::unique_ptr< QgsExpressionContextScope > scope( new QgsExpressionContextScope( QObject::tr( "Algorithm" ) ) );
scope->addFunction( QStringLiteral( "parameter" ), new GetProcessingParameterValue( parameters ) );
if ( !algorithm )
return scope.release();
//add standard algorithm variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "algorithm_id" ), algorithm->id(), true ) );
return scope.release();
}
QgsExpressionContextScope *QgsExpressionContextUtils::processingModelAlgorithmScope( const QgsProcessingModelAlgorithm *model, const QVariantMap &, QgsProcessingContext &context )
{
std::unique_ptr< QgsExpressionContextScope > modelScope( new QgsExpressionContextScope( QObject::tr( "Model" ) ) );
QString modelPath;
if ( !model->sourceFilePath().isEmpty() )
{
modelPath = model->sourceFilePath();
}
else if ( context.project() )
{
// fallback to project path -- the model may be embedded in a project, OR an unsaved model. In either case the
// project path is a logical value to fall back to
modelPath = context.project()->projectStorage() ? context.project()->fileName() : context.project()->absoluteFilePath();
}
const QString modelFolder = !modelPath.isEmpty() ? QFileInfo( modelPath ).path() : QString();
modelScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "model_path" ), QDir::toNativeSeparators( modelPath ), true ) );
modelScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "model_folder" ), QDir::toNativeSeparators( modelFolder ), true, true ) );
modelScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "model_name" ), model->displayName(), true ) );
modelScope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "model_group" ), model->group(), true ) );
// custom variables
const QVariantMap customVariables = model->variables();
for ( auto it = customVariables.constBegin(); it != customVariables.constEnd(); ++it )
{
modelScope->addVariable( QgsExpressionContextScope::StaticVariable( it.key(), it.value(), true ) );
}
return modelScope.release();
}
QgsExpressionContextScope *QgsExpressionContextUtils::notificationScope( const QString &message )
{
std::unique_ptr< QgsExpressionContextScope > scope( new QgsExpressionContextScope() );
scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "notification_message" ), message, true ) );
return scope.release();
}
void QgsExpressionContextUtils::registerContextFunctions()
{
QgsExpression::registerFunction( new GetNamedProjectColor( nullptr ) );
QgsExpression::registerFunction( new GetLayoutItemVariables( nullptr ) );
QgsExpression::registerFunction( new GetLayoutMapLayerCredits( nullptr ) );
QgsExpression::registerFunction( new GetLayerVisibility( QList<QgsMapLayer *>(), 0.0 ) );
QgsExpression::registerFunction( new GetProcessingParameterValue( QVariantMap() ) );
QgsExpression::registerFunction( new GetCurrentFormFieldValue( ) );
QgsExpression::registerFunction( new GetCurrentParentFormFieldValue( ) );
}
bool QgsScopedExpressionFunction::usesGeometry( const QgsExpressionNodeFunction *node ) const
{
Q_UNUSED( node )
return mUsesGeometry;
}
QSet<QString> QgsScopedExpressionFunction::referencedColumns( const QgsExpressionNodeFunction *node ) const
{
Q_UNUSED( node )
return mReferencedColumns;
}
bool QgsScopedExpressionFunction::isStatic( const QgsExpressionNodeFunction *node, QgsExpression *parent, const QgsExpressionContext *context ) const
{
return allParamsStatic( node, parent, context );
}
//
// GetLayerVisibility
//
QgsExpressionContextUtils::GetLayerVisibility::GetLayerVisibility( const QList<QgsMapLayer *> &layers, double scale )
: QgsScopedExpressionFunction( QStringLiteral( "is_layer_visible" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "id" ) ), QStringLiteral( "General" ) )
, mLayers( _qgis_listRawToQPointer( layers ) )
, mScale( scale )
{
for ( const auto &layer : mLayers )
{
if ( layer->hasScaleBasedVisibility() )
{
mScaleBasedVisibilityDetails[ layer ] = qMakePair( layer->minimumScale(), layer->maximumScale() );
}
}
}
QgsExpressionContextUtils::GetLayerVisibility::GetLayerVisibility()
: QgsScopedExpressionFunction( QStringLiteral( "is_layer_visible" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "id" ) ), QStringLiteral( "General" ) )
{}
QVariant QgsExpressionContextUtils::GetLayerVisibility::func( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent, const QgsExpressionNodeFunction * )
{
if ( mLayers.isEmpty() )
{
return false;
}
bool isVisible = false;
QgsMapLayer *layer = QgsExpressionUtils::getMapLayer( values.at( 0 ), parent );
if ( layer && mLayers.contains( layer ) )
{
isVisible = true;
if ( mScaleBasedVisibilityDetails.contains( layer ) && !qgsDoubleNear( mScale, 0.0 ) )
{
if ( ( !qgsDoubleNear( mScaleBasedVisibilityDetails[ layer ].first, 0.0 ) && mScale > mScaleBasedVisibilityDetails[ layer ].first ) ||
( !qgsDoubleNear( mScaleBasedVisibilityDetails[ layer ].second, 0.0 ) && mScale < mScaleBasedVisibilityDetails[ layer ].second ) )
{
isVisible = false;
}
}
}
return isVisible;
}
QgsScopedExpressionFunction *QgsExpressionContextUtils::GetLayerVisibility::clone() const
{
GetLayerVisibility *func = new GetLayerVisibility();
func->mLayers = mLayers;
func->mScale = mScale;
func->mScaleBasedVisibilityDetails = mScaleBasedVisibilityDetails;
return func;
}
//
// mesh expression context
//
/// @cond PRIVATE
class CurrentVertexZValueExpressionFunction: public QgsScopedExpressionFunction
{
public:
CurrentVertexZValueExpressionFunction():
QgsScopedExpressionFunction( "$vertex_z",
0,
QStringLiteral( "Meshes" ) )
{}
QgsScopedExpressionFunction *clone() const override {return new CurrentVertexZValueExpressionFunction();}
QVariant func( const QVariantList &, const QgsExpressionContext *context, QgsExpression *, const QgsExpressionNodeFunction * ) override
{
if ( !context )
return QVariant();