qgslayermetadatasearchwidget.cpp

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/***************************************************************************
  qgslayermetadatasearchwidget.cpp - QgsLayerMetadataSearchWidget
 
 ---------------------
 begin                : 1.9.2022
 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 "qgslayermetadatasearchwidget.h"
#include "moc_qgslayermetadatasearchwidget.cpp"
#include "qgslayermetadataresultsmodel.h"
#include "qgslayermetadataresultsproxymodel.h"
#include "qgsapplication.h"
#include "qgsmapcanvas.h"
#include "qgsprojectviewsettings.h"
#include "qgsiconutils.h"
#include "qgshelp.h"
 
 
QgsLayerMetadataSearchWidget::QgsLayerMetadataSearchWidget( QWidget *parent, Qt::WindowFlags fl, QgsProviderRegistry::WidgetMode widgetMode )
  : QgsAbstractDataSourceWidget( parent, fl, widgetMode )
{
  setupUi( this );
  setupButtons( mButtonBox );
 
  QgsMetadataSearchContext searchContext;
  searchContext.transformContext = QgsProject::instance()->transformContext();
 
  mSourceModel = new QgsLayerMetadataResultsModel( searchContext, this );
  mProxyModel = new QgsLayerMetadataResultsProxyModel( this );
  mProxyModel->setSourceModel( mSourceModel );
  mMetadataTableView->setModel( mProxyModel );
  mMetadataTableView->setSortingEnabled( true );
  mMetadataTableView->sortByColumn( 0, Qt::SortOrder::AscendingOrder );
  mMetadataTableView->horizontalHeader()->setSectionResizeMode( QgsLayerMetadataResultsModel::Sections::Identifier, QHeaderView::ResizeMode::Stretch );
  mMetadataTableView->horizontalHeader()->setSectionResizeMode( QgsLayerMetadataResultsModel::Sections::Title, QHeaderView::ResizeMode::Stretch );
  mMetadataTableView->horizontalHeader()->setSectionResizeMode( QgsLayerMetadataResultsModel::Sections::Abstract, QHeaderView::ResizeMode::Stretch );
  mMetadataTableView->horizontalHeader()->setSectionResizeMode( QgsLayerMetadataResultsModel::Sections::DataProviderName, QHeaderView::ResizeMode::ResizeToContents );
  mMetadataTableView->horizontalHeader()->setSectionResizeMode( QgsLayerMetadataResultsModel::Sections::GeometryType, QHeaderView::ResizeMode::ResizeToContents );
  mMetadataTableView->setSelectionBehavior( QAbstractItemView::SelectRows );
 
  mExtentFilterComboBox->addItem( QString() );
  mExtentFilterComboBox->addItem( QStringLiteral( "Map Canvas Extent" ) );
  mExtentFilterComboBox->addItem( QStringLiteral( "Current Project Extent" ) );
  mExtentFilterComboBox->setCurrentIndex( 0 );
  mExtentFilterComboBox->setSizeAdjustPolicy( QComboBox::SizeAdjustPolicy::AdjustToContents );
  mExtentFilterComboBox->adjustSize();
 
  mGeometryTypeComboBox->addItem( QString(), QVariant() );
  mGeometryTypeComboBox->addItem( QgsIconUtils::iconForGeometryType( Qgis::GeometryType::Point ), QgsWkbTypes::geometryDisplayString( Qgis::GeometryType::Point ), static_cast<int>( Qgis::GeometryType::Point ) );
  mGeometryTypeComboBox->addItem( QgsIconUtils::iconForGeometryType( Qgis::GeometryType::Line ), QgsWkbTypes::geometryDisplayString( Qgis::GeometryType::Line ), static_cast<int>( Qgis::GeometryType::Line ) );
  mGeometryTypeComboBox->addItem( QgsIconUtils::iconForGeometryType( Qgis::GeometryType::Polygon ), QgsWkbTypes::geometryDisplayString( Qgis::GeometryType::Polygon ), static_cast<int>( Qgis::GeometryType::Polygon ) );
  // Note: unknown geometry is mapped to null and missing from the combo
  mGeometryTypeComboBox->addItem( QgsIconUtils::iconForGeometryType( Qgis::GeometryType::Null ), QgsWkbTypes::geometryDisplayString( Qgis::GeometryType::Null ), static_cast<int>( Qgis::GeometryType::Null ) );
  mGeometryTypeComboBox->addItem( QgsApplication::getThemeIcon( QStringLiteral( "mIconRaster.svg" ) ), tr( "Raster" ), QVariant() );
  mGeometryTypeComboBox->setCurrentIndex( 0 );
  mGeometryTypeComboBox->setSizeAdjustPolicy( QComboBox::SizeAdjustPolicy::AdjustToContents );
  mGeometryTypeComboBox->adjustSize();
 
  auto updateLoadBtn = [=] {
    if ( mIsLoading )
    {
      mAbortPushButton->setText( tr( "Abort" ) );
      mAbortPushButton->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mTaskCancel.svg" ) ) );
    }
    else
    {
      mAbortPushButton->setText( tr( "Refresh" ) );
      mAbortPushButton->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionRefresh.svg" ) ) );
    }
  };
 
  connect( mSourceModel, &QgsLayerMetadataResultsModel::progressChanged, mProgressBar, &QProgressBar::setValue );
  connect( mSourceModel, &QgsLayerMetadataResultsModel::progressChanged, this, [=]( int progress ) {
    if ( progress == 100 )
    {
      mIsLoading = false;
      mReloadRequired = false;
      mProgressBar->hide();
      updateLoadBtn();
    }
  } );
 
  connect( mAbortPushButton, &QPushButton::clicked, mSourceModel, [=]( bool ) {
    if ( !mIsLoading )
    {
      mProgressBar->show();
      mReloadRequired = true;
      refresh();
    }
    else
    {
      mProgressBar->hide();
      mSourceModel->cancel();
      mIsLoading = false;
      mReloadRequired = false;
    }
    updateLoadBtn();
  } );
 
  connect( mMetadataTableView->selectionModel(), &QItemSelectionModel::selectionChanged, this, [=]( const QItemSelection &, const QItemSelection & ) {
    emit enableButtons( mMetadataTableView->selectionModel()->hasSelection() );
  } );
 
  connect( mSearchFilterLineEdit, &QLineEdit::textEdited, mProxyModel, &QgsLayerMetadataResultsProxyModel::setFilterString );
  connect( mSearchFilterLineEdit, &QgsFilterLineEdit::cleared, mProxyModel, [=] { mProxyModel->setFilterString( QString() ); } );
  connect( mExtentFilterComboBox, qOverload<int>( &QComboBox::currentIndexChanged ), this, &QgsLayerMetadataSearchWidget::updateExtentFilter );
 
  connect( mGeometryTypeComboBox, qOverload<int>( &QComboBox::currentIndexChanged ), this, [=]( int index ) {
    if ( index == 0 ) // reset all filters
    {
      mProxyModel->setFilterGeometryTypeEnabled( false );
      mProxyModel->setFilterMapLayerTypeEnabled( false );
    }
    else
    {
      const QVariant geomTypeFilterValue( mGeometryTypeComboBox->currentData() );
      if ( geomTypeFilterValue.isValid() ) // Vector layers
      {
        mProxyModel->setFilterGeometryTypeEnabled( true );
        mProxyModel->setFilterGeometryType( geomTypeFilterValue.value<Qgis::GeometryType>() );
        mProxyModel->setFilterMapLayerTypeEnabled( true );
        mProxyModel->setFilterMapLayerType( Qgis::LayerType::Vector );
      }
      else // Raster layers
      {
        mProxyModel->setFilterGeometryTypeEnabled( false );
        mProxyModel->setFilterMapLayerTypeEnabled( true );
        mProxyModel->setFilterMapLayerType( Qgis::LayerType::Raster );
      }
    }
  } );
 
  connect( QgsProject::instance(), &QgsProject::layersAdded, this, [=]( const QList<QgsMapLayer *> & ) {
    updateExtentFilter( mExtentFilterComboBox->currentIndex() );
  } );
 
  connect( QgsProject::instance(), &QgsProject::layersRemoved, this, [=]( const QStringList & ) {
    updateExtentFilter( mExtentFilterComboBox->currentIndex() );
  } );
 
  connect( mButtonBox, &QDialogButtonBox::helpRequested, this, &QgsLayerMetadataSearchWidget::showHelp );
}
 
void QgsLayerMetadataSearchWidget::setMapCanvas( QgsMapCanvas *newMapCanvas )
{
  if ( newMapCanvas && mapCanvas() != newMapCanvas )
  {
    connect( newMapCanvas, &QgsMapCanvas::extentsChanged, this, [=] {
      updateExtentFilter( mExtentFilterComboBox->currentIndex() );
    } );
  }
  QgsAbstractDataSourceWidget::setMapCanvas( newMapCanvas );
}
 
void QgsLayerMetadataSearchWidget::updateExtentFilter( int index )
{
  if ( index == 1 && mapCanvas() )
  {
    QgsCoordinateTransform ct( mapCanvas()->mapSettings().destinationCrs(), QgsCoordinateReferenceSystem::fromEpsgId( 4326 ), QgsProject::instance()->transformContext() );
    ct.setBallparkTransformsAreAppropriate( true );
    mProxyModel->setFilterExtent( ct.transformBoundingBox( mapCanvas()->extent() ) );
  }
  else if ( index == 2 )
  {
    const QgsReferencedRectangle extent = QgsProject::instance()->viewSettings()->fullExtent();
    QgsCoordinateTransform ct( extent.crs(), QgsCoordinateReferenceSystem::fromEpsgId( 4326 ), QgsProject::instance()->transformContext() );
    ct.setBallparkTransformsAreAppropriate( true );
    mProxyModel->setFilterExtent( ct.transformBoundingBox( extent ) );
  }
  else
  {
    mProxyModel->setFilterExtent( QgsRectangle() );
  }
}
 
void QgsLayerMetadataSearchWidget::refresh()
{
  // Lazy reload
  mReloadRequired = true;
  refreshInternal();
}
 
void QgsLayerMetadataSearchWidget::addButtonClicked()
{
  const QModelIndexList &selectedIndexes { mMetadataTableView->selectionModel()->selectedRows() };
  if ( !selectedIndexes.isEmpty() )
  {
    for ( const auto &selectedIndex : std::as_const( selectedIndexes ) )
    {
      const QgsLayerMetadataProviderResult metadataResult { mSourceModel->data( mProxyModel->mapToSource( selectedIndex ), static_cast<int>( QgsLayerMetadataResultsModel::CustomRole::Metadata ) ).value<QgsLayerMetadataProviderResult>() };
 
      QString layerName = metadataResult.title();
      if ( layerName.isEmpty() )
      {
        QVariantMap components = QgsProviderRegistry::instance()->decodeUri( metadataResult.dataProviderName(), metadataResult.uri() );
        if ( components.contains( QStringLiteral( "layerName" ) ) )
        {
          layerName = components.value( QStringLiteral( "layerName" ) ).toString();
        }
        else if ( components.contains( QStringLiteral( "table" ) ) )
        {
          layerName = components.value( QStringLiteral( "table" ) ).toString();
        }
        else
        {
          layerName = metadataResult.identifier();
        }
      }
 
      switch ( metadataResult.layerType() )
      {
        case Qgis::LayerType::Raster:
        {
          Q_NOWARN_DEPRECATED_PUSH
          emit addRasterLayer( metadataResult.uri(), layerName, metadataResult.dataProviderName() );
          Q_NOWARN_DEPRECATED_POP
          emit addLayer( metadataResult.layerType(), metadataResult.uri(), layerName, metadataResult.dataProviderName() );
          break;
        }
        case Qgis::LayerType::Vector:
        {
          Q_NOWARN_DEPRECATED_PUSH
          emit addVectorLayer( metadataResult.uri(), layerName, metadataResult.dataProviderName() );
          Q_NOWARN_DEPRECATED_POP
          emit addLayer( metadataResult.layerType(), metadataResult.uri(), layerName, metadataResult.dataProviderName() );
          break;
        }
        case Qgis::LayerType::Mesh:
        {
          Q_NOWARN_DEPRECATED_PUSH
          emit addMeshLayer( metadataResult.uri(), layerName, metadataResult.dataProviderName() );
          Q_NOWARN_DEPRECATED_POP
          emit addLayer( metadataResult.layerType(), metadataResult.uri(), layerName, metadataResult.dataProviderName() );
          break;
        }
        default: // unsupported
        {
          // Ignore
          break;
        }
      }
    }
  }
}
 
void QgsLayerMetadataSearchWidget::reset()
{
  mSearchFilterLineEdit->clear();
  mExtentFilterComboBox->setCurrentIndex( 0 );
}
 
void QgsLayerMetadataSearchWidget::showEvent( QShowEvent *event )
{
  QgsAbstractDataSourceWidget::showEvent( event );
  mSearchFilterLineEdit->setText( mProxyModel->filterString() );
  refreshInternal();
}
 
void QgsLayerMetadataSearchWidget::showHelp()
{
  QgsHelp::openHelp( QStringLiteral( "managing_data_source/opening_data.html#the-layer-metadata-search-panel" ) );
}
 
void QgsLayerMetadataSearchWidget::refreshInternal()
{
  if ( mReloadRequired && isVisible() )
  {
    mIsLoading = true;
    mSourceModel->reloadAsync();
  }
}