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src
core
qgsvectorlayerfeaturecounter.h
Go to the documentation of this file.
1
/***************************************************************************
2
qgsvectorlayerfeaturecounter.h
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---------------------
4
begin : May 2017
5
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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{
35
Q_OBJECT
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public
:
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45
QgsVectorLayerFeatureCounter
(
QgsVectorLayer
*layer,
const
QgsExpressionContext
&context =
QgsExpressionContext
(),
bool
storeSymbolFids =
false
);
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bool
run
()
override
;
52
59
QHash<QString, long> symbolFeatureCountMap()
const
SIP_SKIP
;
60
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long
featureCount(
const
QString &legendKey )
const
;
66
75
QHash<QString, QgsFeatureIds> symbolFeatureIdMap()
const
SIP_SKIP
;
76
83
QgsFeatureIds
featureIds(
const
QString &symbolkey )
const
;
84
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signals:
86
90
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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QHash<QString, QgsFeatureIds> mSymbolFeatureIdMap;
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bool
mWithFids =
false
;
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int
mFeatureCount;
100
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};
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#endif // QGSVECTORLAYERFEATURECOUNTER_H
QgsVectorLayerFeatureCounter
Counts the features in a QgsVectorLayer in task.
Definition:
qgsvectorlayerfeaturecounter.h:34
QgsExpressionContext
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Definition:
qgsexpressioncontext.h:370
qgstaskmanager.h
qgsfeatureid.h
SIP_SKIP
#define SIP_SKIP
Definition:
qgis_sip.h:126
qgsvectorlayerfeatureiterator.h
qgsrenderer.h
QgsFeatureIds
QSet< QgsFeatureId > QgsFeatureIds
Definition:
qgsfeatureid.h:37
QgsVectorLayer
Represents a vector layer which manages a vector based data sets.
Definition:
qgsvectorlayer.h:387
QgsVectorLayerFeatureCounter::symbolsCounted
void symbolsCounted()
Emitted when the symbols have been counted.
QgsTask::run
virtual bool run()=0
Performs the task's operation.
QgsTask
Abstract base class for long running background tasks.
Definition:
qgstaskmanager.h:53
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