QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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qgslistfieldformatter.cpp
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1/***************************************************************************
2 qgslistfieldformatter.cpp - QgsListFieldFormatter
3
4 ---------------------
5 begin : 3.12.2016
6 copyright : (C) 2016 by Matthias Kuhn
8 ***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 ***************************************************************************/
17#include "qgsapplication.h"
18#include "qgsvariantutils.h"
19#include <QSettings>
20
22{
23 return QStringLiteral( "List" );
24}
25
26QString QgsListFieldFormatter::representValue( QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config, const QVariant &cache, const QVariant &value ) const
27{
28 Q_UNUSED( layer )
29 Q_UNUSED( fieldIndex )
30 Q_UNUSED( config )
31 Q_UNUSED( cache )
32
33 if ( QgsVariantUtils::isNull( value ) )
34 {
36 }
37
38 QString result;
39 const QVariantList list = value.toList();
40 for ( const QVariant &val : list )
41 {
42 if ( !result.isEmpty() )
43 result.append( ", " );
44 result.append( val.toString() );
45 }
46 return result;
47}
static QString nullRepresentation()
Returns the string used to represent the value NULL throughout QGIS.
QString representValue(QgsVectorLayer *layer, int fieldIndex, const QVariantMap &config, const QVariant &cache, const QVariant &value) const override
Create a pretty String representation of the value.
QString id() const override
Returns a unique id for this field formatter.
static bool isNull(const QVariant &variant, bool silenceNullWarnings=false)
Returns true if the specified variant should be considered a NULL value.
Represents a vector layer which manages a vector based data sets.