QGIS API Documentation
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src
core
vector
qgsvectorlayerfeaturecounter.h
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/***************************************************************************
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qgsvectorlayerfeaturecounter.h
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---------------------
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begin : May 2017
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copyright : (C) 2017 by Matthias Kuhn
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email : matthias at opengis dot ch
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGSVECTORLAYERFEATURECOUNTER_H
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#define QGSVECTORLAYERFEATURECOUNTER_H
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#include "
qgsvectorlayerfeatureiterator.h
"
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#include "
qgsrenderer.h
"
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#include "
qgstaskmanager.h
"
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#include "
qgsfeatureid.h
"
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class
CORE_EXPORT
QgsVectorLayerFeatureCounter
:
public
QgsTask
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{
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Q_OBJECT
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public
:
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QgsVectorLayerFeatureCounter
(
QgsVectorLayer
*layer,
const
QgsExpressionContext
&context =
QgsExpressionContext
(),
bool
storeSymbolFids =
false
);
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~QgsVectorLayerFeatureCounter
()
override
;
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bool
run
()
override
;
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void
cancel
()
override
;
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QHash<QString, long long> symbolFeatureCountMap() const
SIP_SKIP
;
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long
long
featureCount( const QString &legendKey ) const;
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QHash<QString,
QgsFeatureIds
> symbolFeatureIdMap() const
SIP_SKIP
;
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QgsFeatureIds
featureIds( const QString &symbolkey ) const;
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signals:
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void
symbolsCounted();
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private:
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std::
unique_ptr
<
QgsVectorLayerFeatureSource
> mSource;
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std::
unique_ptr
<
QgsFeatureRenderer
> mRenderer;
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QgsExpressionContext
mExpressionContext;
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QHash<QString,
long
long
> mSymbolFeatureCountMap;
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QHash<QString,
QgsFeatureIds
> mSymbolFeatureIdMap;
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std::
unique_ptr
<
QgsFeedback
> mFeedback;
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bool
mWithFids = false;
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long
mFeatureCount = 0;
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};
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#endif
// QGSVECTORLAYERFEATURECOUNTER_H
QgsExpressionContext
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Definition:
qgsexpressioncontext.h:372
QgsFeatureRenderer
Definition:
qgsrenderer.h:102
QgsFeedback
Base class for feedback objects to be used for cancellation of something running in a worker thread.
Definition:
qgsfeedback.h:45
QgsTask
Abstract base class for long running background tasks.
Definition:
qgstaskmanager.h:55
QgsTask::run
virtual bool run()=0
Performs the task's operation.
QgsTask::cancel
virtual void cancel()
Notifies the task that it should terminate.
Definition:
qgstaskmanager.cpp:91
QgsVectorLayerFeatureCounter
Counts the features in a QgsVectorLayer in task.
Definition:
qgsvectorlayerfeaturecounter.h:34
QgsVectorLayerFeatureCounter::~QgsVectorLayerFeatureCounter
~QgsVectorLayerFeatureCounter() override
QgsVectorLayerFeatureSource
Partial snapshot of vector layer's state (only the members necessary for access to features)
Definition:
qgsvectorlayerfeatureiterator.h:53
QgsVectorLayer
Represents a vector layer which manages a vector based data sets.
Definition:
qgsvectorlayer.h:392
geos::unique_ptr
std::unique_ptr< GEOSGeometry, GeosDeleter > unique_ptr
Scoped GEOS pointer.
Definition:
qgsgeos.h:79
SIP_SKIP
#define SIP_SKIP
Definition:
qgis_sip.h:126
qgsfeatureid.h
QgsFeatureIds
QSet< QgsFeatureId > QgsFeatureIds
Definition:
qgsfeatureid.h:37
qgsrenderer.h
qgstaskmanager.h
qgsvectorlayerfeatureiterator.h
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