qgsvaluemapwidgetwrapper.cpp

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/***************************************************************************
    qgsvaluemapwidgetwrapper.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 "qgsvaluemapwidgetwrapper.h"
#include "qgsvaluemapconfigdlg.h"
#include "qgsvaluemapfieldformatter.h"
#include "qgsapplication.h"
 
#include <QSettings>
 
QgsValueMapWidgetWrapper::QgsValueMapWidgetWrapper( QgsVectorLayer *layer, int fieldIdx, QWidget *editor, QWidget *parent )
  : QgsEditorWidgetWrapper( layer, fieldIdx, editor, parent )
 
{
}
 
 
QVariant QgsValueMapWidgetWrapper::value() const
{
  QVariant v;
 
  if ( mComboBox )
  {
    v = mComboBox->currentData();
  }
 
  if ( v == QgsValueMapFieldFormatter::NULL_VALUE )
    v = QVariant( field().type() );
 
  return v;
}
 
void QgsValueMapWidgetWrapper::showIndeterminateState()
{
  if ( mComboBox )
  {
    whileBlocking( mComboBox )->setCurrentIndex( -1 );
  }
}
 
QWidget *QgsValueMapWidgetWrapper::createWidget( QWidget *parent )
{
  return new QComboBox( parent );
}
 
void QgsValueMapWidgetWrapper::initWidget( QWidget *editor )
{
  mComboBox = qobject_cast<QComboBox *>( editor );
 
  if ( mComboBox )
  {
    QgsValueMapConfigDlg::populateComboBox( mComboBox, config(), false );
    mComboBox->view()->setVerticalScrollBarPolicy( Qt::ScrollBarAsNeeded );
    connect( mComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ),
             this, static_cast<void ( QgsEditorWidgetWrapper::* )()>( &QgsEditorWidgetWrapper::emitValueChanged ) );
  }
}
 
bool QgsValueMapWidgetWrapper::valid() const
{
  return mComboBox;
}
 
void QgsValueMapWidgetWrapper::updateValues( const QVariant &value, const QVariantList & )
{
  QString v;
  if ( value.isNull() )
    v = QgsValueMapFieldFormatter::NULL_VALUE;
  else
    v = value.toString();
 
  if ( mComboBox )
  {
    if ( mComboBox->findData( v ) == -1 )
    {
      if ( value.isNull( ) )
      {
        mComboBox->addItem( QgsApplication::nullRepresentation().prepend( '(' ).append( ')' ), v );
      }
      else
      {
        mComboBox->addItem( QString( v ).prepend( '(' ).append( ')' ), v );
      }
    }
    mComboBox->setCurrentIndex( mComboBox->findData( v ) );
  }
}