QGIS API Documentation
3.0.2-Girona (307d082)
src
core
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 "
qgsvectorlayer.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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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
() );
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bool
run
()
override
;
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QHash<QString, long> symbolFeatureCountMap()
const
SIP_SKIP
;
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long
featureCount(
const
QString &legendKey )
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> mSymbolFeatureCountMap;
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int
mFeatureCount;
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};
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#endif // QGSVECTORLAYERFEATURECOUNTER_H
QgsVectorLayerFeatureCounter
Counts the features in a QgsVectorLayer in task.
Definition:
qgsvectorlayerfeaturecounter.h:33
SIP_SKIP
#define SIP_SKIP
Definition:
qgis_sip.h:119
QgsExpressionContext
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Definition:
qgsexpressioncontext.h:375
QgsTask
Abstract base class for long running background tasks.
Definition:
qgstaskmanager.h:53
qgsvectorlayerfeatureiterator.h
qgsrenderer.h
QgsTask::run
virtual bool run()=0
Performs the task's operation.
qgsvectorlayer.h
QgsVectorLayer
Represents a vector layer which manages a vector based data sets.
Definition:
qgsvectorlayer.h:353
qgstaskmanager.h
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