qgsloadrasterattributetabledialog.cpp

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/***************************************************************************
  qgsloadrasterattributetabledialog.cpp - QgsLoadRasterAttributeTableDialog
 
 ---------------------
 begin                : 21.10.2022
 copyright            : (C) 2022 by Alessandro Pasotti
 email                : elpaso at itopen dot it
 ***************************************************************************
 *                                                                         *
 *   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 "qgsloadrasterattributetabledialog.h"
 
#include "qgsgui.h"
#include "qgshelp.h"
#include "qgsmessagebar.h"
#include "qgsrasterattributetable.h"
 
#include <QMessageBox>
#include <QPushButton>
#include <QString>
 
#include "moc_qgsloadrasterattributetabledialog.cpp"
 
using namespace Qt::StringLiterals;
 
QgsLoadRasterAttributeTableDialog::QgsLoadRasterAttributeTableDialog( QgsRasterLayer *rasterLayer, QWidget *parent )
  : QDialog( parent )
  , mRasterLayer( rasterLayer )
{
  setupUi( this );
 
  connect( mButtonBox, &QDialogButtonBox::accepted, this, &QDialog::accept );
  connect( mButtonBox, &QDialogButtonBox::rejected, this, &QDialog::reject );
  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, [] { QgsHelp::openHelp( u"working_with_raster/raster_properties.html#raster-attribute-tables"_s ); } );
 
  connect( mDbfPathWidget, &QgsFileWidget::fileChanged, this, [this]( const QString & ) { updateButtons(); } );
 
  mRasterBand->setLayer( mRasterLayer );
 
  mDbfPathWidget->setFilter( u"VAT DBF Files (*.vat.dbf)"_s );
 
  updateButtons();
 
  QgsGui::enableAutoGeometryRestore( this );
}
 
QString QgsLoadRasterAttributeTableDialog::filePath() const
{
  return mDbfPathWidget->filePath();
}
 
int QgsLoadRasterAttributeTableDialog::rasterBand()
{
  return mRasterBand->currentBand();
}
 
void QgsLoadRasterAttributeTableDialog::setMessageBar( QgsMessageBar *bar )
{
  mMessageBar = bar;
}
 
bool QgsLoadRasterAttributeTableDialog::openWhenDone() const
{
  return mOpenRat->isChecked();
}
 
void QgsLoadRasterAttributeTableDialog::setOpenWhenDoneVisible( bool visible )
{
  if ( !visible )
  {
    mOpenRat->setChecked( false );
  }
  mOpenRat->setVisible( visible );
}
 
void QgsLoadRasterAttributeTableDialog::accept()
{
  bool success { false };
 
  if ( rasterBand() < 1 )
  {
    notify( tr( "Invalid Raster Band" ), tr( "The selected raster band %1 is not valid." ).arg( rasterBand() ), Qgis::MessageLevel::Critical );
  }
  else
  {
    auto rat = std::make_unique<QgsRasterAttributeTable>();
 
    QString errorMessage;
    success = rat->readFromFile( filePath(), &errorMessage );
 
    if ( !success )
    {
      notify( tr( "Error Loading Raster Attribute Table " ), tr( "The raster attribute table could not be loaded.\n%1" ).arg( errorMessage ), Qgis::MessageLevel::Critical );
    }
    else
    {
      if ( !rat->isValid( &errorMessage ) )
      {
        switch (
          QMessageBox::warning( nullptr, tr( "Invalid Raster Attribute Table" ), tr( "The raster attribute table is not valid:\n%1\nLoad anyway?" ).arg( errorMessage ), QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel )
        )
        {
          case QMessageBox::Cancel:
            return;
          case QMessageBox::Yes:
            success = true;
            break;
          case QMessageBox::No:
          default:
            success = false;
            break;
        }
      }
 
      if ( mRasterLayer->attributeTable( rasterBand() ) && !mRasterLayer->attributeTable( rasterBand() )->filePath().isEmpty() )
      {
        switch ( QMessageBox::warning(
          nullptr,
          tr( "Confirm Attribute Table Replacement" ),
          tr( "Raster band %1 already has an associated attribute table loaded from '%2'. Are you sure you want to replace the existing raster attribute table?" )
            .arg( QString::number( rasterBand() ), mRasterLayer->attributeTable( rasterBand() )->filePath() ),
          QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel
        ) )
        {
          case QMessageBox::Cancel:
            return;
          case QMessageBox::Yes:
            success = true;
            break;
          case QMessageBox::No:
          default:
            success = false;
            break;
        }
      }
 
      if ( success )
      {
        mRasterLayer->dataProvider()->setAttributeTable( rasterBand(), rat.release() );
        notify( tr( "Raster Attribute Table Loaded" ), tr( "The new raster attribute table was successfully loaded." ), Qgis::MessageLevel::Success );
      }
    }
  }
 
  QDialog::accept();
}
 
void QgsLoadRasterAttributeTableDialog::notify( const QString &title, const QString &message, Qgis::MessageLevel level )
{
  if ( mMessageBar )
  {
    mMessageBar->pushMessage( message, level );
  }
  else
  {
    switch ( level )
    {
      case Qgis::MessageLevel::Info:
      case Qgis::MessageLevel::Success:
      case Qgis::MessageLevel::NoLevel:
      {
        QMessageBox::information( nullptr, title, message );
        break;
      }
      case Qgis::MessageLevel::Warning:
      {
        QMessageBox::warning( nullptr, title, message );
        break;
      }
      case Qgis::MessageLevel::Critical:
      {
        QMessageBox::critical( nullptr, title, message );
        break;
      }
    }
  }
}
 
void QgsLoadRasterAttributeTableDialog::updateButtons()
{
  const bool isValidPath { !mDbfPathWidget->filePath().isEmpty() && QFile::exists( mDbfPathWidget->filePath() ) };
  mButtonBox->button( QDialogButtonBox::StandardButton::Ok )->setEnabled( isValidPath );
}