qgsclassificationwidgetwrapper.cpp

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/***************************************************************************
    qgsclassificationwidgetwrapper.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 "qgsclassificationwidgetwrapper.h"

#include "qgscategorizedsymbolrenderer.h"
#include "qgsvectorlayer.h"

QgsClassificationWidgetWrapper::QgsClassificationWidgetWrapper( QgsVectorLayer *layer, int fieldIdx, QWidget *editor, QWidget *parent )
  :  QgsEditorWidgetWrapper( layer, fieldIdx, editor, parent )

{
}

QVariant QgsClassificationWidgetWrapper::value() const
{
  return mComboBox->currentData();
}

void QgsClassificationWidgetWrapper::showIndeterminateState()
{
  whileBlocking( mComboBox )->setCurrentIndex( -1 );
}

QWidget *QgsClassificationWidgetWrapper::createWidget( QWidget *parent )
{
  return new QComboBox( parent );
}

void QgsClassificationWidgetWrapper::initWidget( QWidget *editor )
{
  mComboBox = qobject_cast<QComboBox *>( editor );

  if ( mComboBox )
  {
    const QgsCategorizedSymbolRenderer *csr = dynamic_cast<const QgsCategorizedSymbolRenderer *>( layer()->renderer() );
    if ( csr )
    {
      const QgsCategoryList categories = csr->categories();
      for ( int i = 0; i < categories.size(); i++ )
      {
        QString label = categories[i].label();
        QString value = categories[i].value().toString();
        if ( label.isEmpty() )
          label = value;

        mComboBox->addItem( label, value );
      }
    }

    connect( mComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ),
             this, static_cast<void ( QgsEditorWidgetWrapper::* )()>( &QgsEditorWidgetWrapper::emitValueChanged ) );
  }
}

bool QgsClassificationWidgetWrapper::valid() const
{
  return mComboBox;
}

void QgsClassificationWidgetWrapper::updateValues( const QVariant &value, const QVariantList & )
{
  mComboBox->setCurrentIndex( mComboBox->findData( value ) );
}