QGIS API Documentation 3.34.0-Prizren (ffbdd678812)
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qgsvectorlayerutils.h
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1/***************************************************************************
2 qgsvectorlayerutils.h
3 ---------------------
4 Date : October 2016
5 Copyright : (C) 2016 by Nyall Dawson
6 Email : nyall dot dawson at gmail dot com
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15
16#ifndef QGSVECTORLAYERUTILS_H
17#define QGSVECTORLAYERUTILS_H
18
19#include "qgis_core.h"
20#include "qgsgeometry.h"
22#include "qgsfeaturesink.h"
23
25class QgsSymbolLayer;
27
28
29#ifndef SIP_RUN
30
32{
33 bool hasEffects = false;
34
35 // masked symbol layers
36 QSet<QString> symbolLayerIds;
37};
38
40typedef QHash<QString, QgsMaskedLayer> QgsMaskedLayers;
41
42#endif
43
52class CORE_EXPORT QgsVectorLayerUtils
53{
54 public:
55
64 {
65 public:
66
69
74 QList<QgsVectorLayer *> layers() const;
75
80 QgsFeatureIds duplicatedFeatures( QgsVectorLayer *layer ) const;
81
82
83 private:
84 QMap<QgsVectorLayer *, QgsFeatureIds> mDuplicatedFeatures;
85 friend class QgsVectorLayerUtils;
86
91 void setDuplicatedFeatures( QgsVectorLayer *layer, const QgsFeatureIds &ids );
92 };
93
101 class CORE_EXPORT QgsFeatureData
102 {
103 public:
104
108 QgsFeatureData( const QgsGeometry &geometry = QgsGeometry(), const QgsAttributeMap &attributes = QgsAttributeMap() );
109
111 QgsGeometry geometry() const;
112
114 QgsAttributeMap attributes() const;
115
116 private:
117 QgsGeometry mGeometry;
118 QgsAttributeMap mAttributes;
119 };
120
121 // SIP does not like "using", use legacy typedef
123 typedef QList<QgsVectorLayerUtils::QgsFeatureData> QgsFeaturesDataList;
124
134 static QgsFeatureIterator getValuesIterator( const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly );
135
147 static QList< QVariant > getValues( const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly = false, QgsFeedback *feedback = nullptr );
148
162 static QList< double > getDoubleValues( const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly = false, int *nullCount = nullptr, QgsFeedback *feedback = nullptr );
163
170 static bool valueExists( const QgsVectorLayer *layer, int fieldIndex, const QVariant &value, const QgsFeatureIds &ignoreIds = QgsFeatureIds() );
171
177 static QVariant createUniqueValue( const QgsVectorLayer *layer, int fieldIndex, const QVariant &seed = QVariant() );
178
185 static QVariant createUniqueValueFromCache( const QgsVectorLayer *layer, int fieldIndex, const QSet<QVariant> &existingValues, const QVariant &seed = QVariant() );
186
193 static bool attributeHasConstraints( const QgsVectorLayer *layer, int attributeIndex );
194
200 static bool validateAttribute( const QgsVectorLayer *layer, const QgsFeature &feature, int attributeIndex, QStringList &errors SIP_OUT,
203
212 static QgsFeature createFeature( const QgsVectorLayer *layer,
213 const QgsGeometry &geometry = QgsGeometry(),
214 const QgsAttributeMap &attributes = QgsAttributeMap(),
215 QgsExpressionContext *context = nullptr );
216
224 static QgsFeatureList createFeatures( const QgsVectorLayer *layer,
225 const QgsFeaturesDataList &featuresData,
226 QgsExpressionContext *context = nullptr );
227
238 static QgsFeature duplicateFeature( QgsVectorLayer *layer, const QgsFeature &feature, QgsProject *project, QgsDuplicateFeatureContext &duplicateFeatureContext SIP_OUT, const int maxDepth = 0, int depth SIP_PYARGREMOVE = 0, QList<QgsVectorLayer *> referencedLayersBranch SIP_PYARGREMOVE = QList<QgsVectorLayer *>() );
239
240
255 static std::unique_ptr<QgsVectorLayerFeatureSource> getFeatureSource( QPointer<QgsVectorLayer> layer, QgsFeedback *feedback = nullptr ) SIP_SKIP;
256
276 static void matchAttributesToFields( QgsFeature &feature, const QgsFields &fields );
277
299 static QgsFeatureList makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer *layer, QgsFeatureSink::SinkFlags sinkFlags = QgsFeatureSink::SinkFlags() );
300
322 static QgsFeatureList makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer *layer, QgsFeatureSink::SinkFlags sinkFlags = QgsFeatureSink::SinkFlags() );
323
332 static bool fieldIsEditable( const QgsVectorLayer *layer, int fieldIndex, const QgsFeature &feature );
333
343 static bool fieldIsReadOnly( const QgsVectorLayer *layer, int fieldIndex );
344
354 static bool fieldEditabilityDependsOnFeature( const QgsVectorLayer *layer, int fieldIndex );
355
363 static QHash<QString, QgsMaskedLayers> labelMasks( const QgsVectorLayer * ) SIP_SKIP;
364
372 static QgsMaskedLayers symbolLayerMasks( const QgsVectorLayer * ) SIP_SKIP;
373
379 static QString getFeatureDisplayString( const QgsVectorLayer *layer, const QgsFeature &feature );
380
387 {
388 IgnoreAuxiliaryLayers = 1 << 1,
389 };
390 Q_DECLARE_FLAGS( CascadedFeatureFlags, CascadedFeatureFlag )
391
392
398 static bool impactsCascadeFeatures( const QgsVectorLayer *layer, const QgsFeatureIds &fids, const QgsProject *project, QgsDuplicateFeatureContext &context SIP_OUT, QgsVectorLayerUtils::CascadedFeatureFlags flags = QgsVectorLayerUtils::CascadedFeatureFlags() );
399
400#ifndef SIP_RUN
401
422#else
423
441#endif
442 static QString guessFriendlyIdentifierField( const QgsFields &fields, bool *foundFriendly SIP_OUT = nullptr ) SIP_PYNAME( guessFriendlyIdentifierFieldV2 );
443
444#ifdef SIP_RUN
445
462 static QString guessFriendlyIdentifierField( const QgsFields &fields );
463#endif
464
465};
466
467
468#endif // QGSVECTORLAYERUTILS_H
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Wrapper for iterator of features from vector data provider or vector layer.
An interface for objects which accept features via addFeature(s) methods.
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
Definition qgsfeature.h:56
Base class for feedback objects to be used for cancellation of something running in a worker thread.
Definition qgsfeedback.h:45
ConstraintStrength
Strength of constraints.
@ ConstraintStrengthNotSet
Constraint is not set.
ConstraintOrigin
Origin of constraints.
@ ConstraintOriginNotSet
Constraint is not set.
Container of fields for a vector layer.
Definition qgsfields.h:45
A geometry is the spatial representation of a feature.
Encapsulates a QGIS project, including sets of map layers and their styles, layouts,...
Definition qgsproject.h:107
We may need stable references to symbol layers, when pointers to symbol layers is not usable (when a ...
Contains mainly the QMap with QgsVectorLayer and QgsFeatureIds do list all the duplicated features.
QgsDuplicateFeatureContext()=default
Constructor for QgsDuplicateFeatureContext.
Encapsulate geometry and attributes for new features, to be passed to createFeatures.
Contains utility methods for working with QgsVectorLayers.
QList< QgsVectorLayerUtils::QgsFeatureData > QgsFeaturesDataList
Alias for list of QgsFeatureData.
CascadedFeatureFlag
Flags that can be used when determining cascaded features.
Represents a vector layer which manages a vector based data sets.
#define SIP_SKIP
Definition qgis_sip.h:126
#define SIP_PYNAME(name)
Definition qgis_sip.h:81
#define SIP_PYARGREMOVE
Definition qgis_sip.h:151
#define SIP_OUT
Definition qgis_sip.h:58
QMap< int, QVariant > QgsAttributeMap
QList< QgsFeature > QgsFeatureList
Definition qgsfeature.h:920
QSet< QgsFeatureId > QgsFeatureIds
QHash< QString, QgsMaskedLayer > QgsMaskedLayers
masked layers where key is the layer id
QSet< QString > symbolLayerIds