qgsenumerationwidgetwrapper.cpp

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/***************************************************************************
    qgsenumerationwidgetwrapper.cpp
     --------------------------------------
    Date                 : 5.1.2014
    Copyright            : (C) 2014 Matthias Kuhn
    Email                : matthias at opengis dot ch
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsenumerationwidgetwrapper.h"
 
#include "qgsapplication.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorlayer.h"
 
#include "moc_qgsenumerationwidgetwrapper.cpp"
 
QgsEnumerationWidgetWrapper::QgsEnumerationWidgetWrapper( QgsVectorLayer *layer, int fieldIdx, QWidget *editor, QWidget *parent )
  : QgsEditorWidgetWrapper( layer, fieldIdx, editor, parent )
 
{}
 
 
QVariant QgsEnumerationWidgetWrapper::value() const
{
  QVariant value;
 
  if ( mComboBox )
    value = mComboBox->currentData();
 
  return value;
}
 
void QgsEnumerationWidgetWrapper::showIndeterminateState()
{
  if ( mComboBox )
  {
    whileBlocking( mComboBox )->setCurrentIndex( -1 );
  }
}
 
QWidget *QgsEnumerationWidgetWrapper::createWidget( QWidget *parent )
{
  QComboBox *combo = new QComboBox( parent );
  combo->setMinimumContentsLength( 1 );
  combo->setSizeAdjustPolicy( QComboBox::SizeAdjustPolicy::AdjustToMinimumContentsLengthWithIcon );
  return combo;
}
 
void QgsEnumerationWidgetWrapper::initWidget( QWidget *editor )
{
  mComboBox = qobject_cast<QComboBox *>( editor );
 
  if ( mComboBox )
  {
    const QgsField field( layer()->fields().at( fieldIdx() ) );
    // also add NULL entry if not restricted by constraints
    if ( !( field.constraints().constraints() & QgsFieldConstraints::ConstraintNotNull ) )
    {
      mComboBox->addItem( QgsApplication::nullRepresentation(), QgsVariantUtils::createNullVariant( field.type() ) );
    }
 
    const QList<QPair<QString, QString>> values( layer()->dataProvider()->codedValues( fieldIdx() ) );
    for ( const QPair<QString, QString> &pair : values )
    {
      mComboBox->addItem( pair.second, pair.first );
    }
    connect( mComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, static_cast<void ( QgsEditorWidgetWrapper::* )()>( &QgsEditorWidgetWrapper::emitValueChanged ) );
  }
}
 
bool QgsEnumerationWidgetWrapper::valid() const
{
  return mComboBox;
}
 
void QgsEnumerationWidgetWrapper::updateValues( const QVariant &value, const QVariantList & )
{
  if ( mComboBox )
  {
    mComboBox->setCurrentIndex( mComboBox->findData( value ) );
  }
}