QGIS API Documentation
3.37.0-Master (fdefdf9c27f)
src
core
vector
qgsvectorlayerfeaturecounter.h
Go to the documentation of this file.
1
/***************************************************************************
2
qgsvectorlayerfeaturecounter.h
3
---------------------
4
begin : May 2017
5
copyright : (C) 2017 by Matthias Kuhn
6
email : matthias at opengis dot ch
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
#ifndef QGSVECTORLAYERFEATURECOUNTER_H
16
#define QGSVECTORLAYERFEATURECOUNTER_H
17
18
#include "
qgsvectorlayerfeatureiterator.h
"
19
#include "
qgsrenderer.h
"
20
#include "
qgstaskmanager.h
"
21
#include "
qgsfeatureid.h
"
22
32
class
CORE_EXPORT
QgsVectorLayerFeatureCounter
:
public
QgsTask
33
{
34
Q_OBJECT
35
36
public
:
37
44
QgsVectorLayerFeatureCounter
(
QgsVectorLayer
*layer,
const
QgsExpressionContext
&context =
QgsExpressionContext
(),
bool
storeSymbolFids =
false
);
45
~QgsVectorLayerFeatureCounter
()
override
;
46
50
bool
run
()
override
;
51
52
void
cancel
()
override
;
53
60
QHash<QString, long long> symbolFeatureCountMap() const
SIP_SKIP
;
61
66
long
long
featureCount( const QString &legendKey ) const;
67
76
QHash<QString,
QgsFeatureIds
> symbolFeatureIdMap() const
SIP_SKIP
;
77
84
QgsFeatureIds
featureIds( const QString &symbolkey ) const;
85
86
signals:
87
91
void
symbolsCounted();
92
93
private:
94
std::
unique_ptr
<
QgsVectorLayerFeatureSource
> mSource;
95
std::
unique_ptr
<
QgsFeatureRenderer
> mRenderer;
96
QgsExpressionContext
mExpressionContext;
97
QHash<QString,
long
long
> mSymbolFeatureCountMap;
98
QHash<QString,
QgsFeatureIds
> mSymbolFeatureIdMap;
99
std::
unique_ptr
<
QgsFeedback
> mFeedback;
100
bool
mWithFids = false;
101
long
mFeatureCount = 0;
102
103
};
104
105
#endif
// QGSVECTORLAYERFEATURECOUNTER_H
QgsExpressionContext
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Definition:
qgsexpressioncontext.h:471
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:44
QgsTask
Abstract base class for long running background tasks.
Definition:
qgstaskmanager.h:54
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:33
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:400
geos::unique_ptr
std::unique_ptr< GEOSGeometry, GeosDeleter > unique_ptr
Scoped GEOS pointer.
Definition:
qgsgeos.h:73
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
Generated by
1.9.4