Address PR review comments and add model tests

python/core/auto_generated/browser/qgslayeritem.sip.in

@@ -146,7 +146,7 @@ Returns icon for point cloud layer
     const QgsLayerMetadata &layerMetadata() const;
 %Docstring
 Returns layer's metadata, it may be a default constructed metadata
-if metadata are not explicitly set.
+if metadata is not explicitly set.
 
 .. versionadded:: 3.28
 %End

python/core/auto_generated/metadata/qgsabstractlayermetadataprovider.sip.in

@@ -121,10 +121,6 @@ Returns the metadata standard URI (usually "http://mrcc.com/qgis.dtd")
 Sets the metadata standard URI to ``standardUri``.
 %End
 
-    QIcon layerTypeIcon() const;
-%Docstring
-Returns the icon for the layer type.
-%End
 
 };
 
@@ -182,6 +178,8 @@ Layer metadata provider backend interface.
 %End
   public:
 
+    virtual ~QgsAbstractLayerMetadataProvider();
+
     virtual QString id() const = 0;
 %Docstring
 Returns the id of the layer metadata provider implementation, usually the name of the data provider
@@ -200,8 +198,6 @@ Searches for metadata optionally filtering by search string and geographic exten
 :return: a :py:class:`QgsLayerMetadataSearchResult` object with a list of metadata and errors
 %End
 
-    virtual ~QgsAbstractLayerMetadataProvider();
-
 };
 
 /************************************************************************

python/core/auto_generated/metadata/qgslayermetadata.sip.in

@@ -115,8 +115,6 @@ Constructor for Constraint.
 Constructor for QgsLayerMetadata.
 %End
 
-    ~QgsLayerMetadata( );
-
     QgsLayerMetadata( const QgsLayerMetadata &other );
 %Docstring
 Copy constructor for :py:class:`QgsLayerMetadataProviderResult` from ``other``.

python/core/auto_generated/qgsiconutils.sip.in

@@ -25,6 +25,12 @@ Contains utility functions for working with icons.
     static QIcon iconForWkbType( QgsWkbTypes::Type type );
 %Docstring
 Returns the icon for a vector layer whose geometry ``type`` is provided.
+%End
+
+    static QIcon iconForGeometryType( QgsWkbTypes::GeometryType typeGroup );
+%Docstring
+Returns the icon for a vector layer whose geometry ``typeGroup`` is provided.
+1since QGIS 3.28
 %End
 
     static QIcon iconPoint();

python/gui/auto_generated/qgsabstractdatasourcewidget.sip.in

@@ -20,6 +20,9 @@ This class provides common functionality and the interface for all
 source select dialogs used by data providers to configure data sources
 and add layers.
 
+The implementation is generic enough to handle other layer search and
+selection widgets.
+
 .. versionadded:: 3.0
 %End
 

python/gui/auto_generated/qgssourceselectprovider.sip.in

@@ -28,6 +28,7 @@ This is the interface for those who want to add entries to the :py:class:`QgsDat
       OrderDatabaseProvider,
       OrderRemoteProvider,
       OrderGeoCmsProvider,
+      OrderSearchProvider,
       OrderOtherProvider,
     };
 

python/gui/gui_auto.sip

@@ -105,6 +105,7 @@
 %Include auto_generated/qgslayermetadatasearchwidget.sip
 %Include auto_generated/qgslayermetadataresultsmodel.sip
 %Include auto_generated/qgslayermetadataresultsproxymodel.sip
+%Include auto_generated/qgslayermetadatasourceselectprovider.sip
 %Include auto_generated/qgslegendfilterbutton.sip
 %Include auto_generated/qgslegendpatchshapebutton.sip
 %Include auto_generated/qgslegendpatchshapewidget.sip

src/app/locator/qgslayermetadatalocatorfilter.cpp

@@ -18,6 +18,8 @@
 #include "qgsfeedback.h"
 #include "qgsapplication.h"
 #include "qgisapp.h"
+#include "qgsiconutils.h"
+#include <QIcon>
 
 QgsLayerMetadataLocatorFilter::QgsLayerMetadataLocatorFilter( QObject *parent )
   : QgsLocatorFilter( parent )
@@ -44,7 +46,7 @@ void QgsLayerMetadataLocatorFilter::fetchResults( const QString &string, const Q
       QgsLocatorResult result;
       result.displayString = metadata.identifier();
       result.description = metadata.title();
-      result.icon = metadata.layerTypeIcon();
+      result.icon = QgsIconUtils::iconForGeometryType( metadata.geometryType() );
       result.userData = QVariant::fromValue( metadata );
       emit resultFetched( result );
     }
@@ -69,6 +71,7 @@ void QgsLayerMetadataLocatorFilter::triggerResult( const QgsLocatorResult &resul
     case QgsMapLayerType::MeshLayer:
     {
       QgisApp::instance()->addMeshLayer( metadataResult.uri(), metadataResult.identifier(), metadataResult.dataProviderName() );
+      break;
     }
     default:  // unsupported
     {

src/core/browser/qgslayeritem.h

@@ -145,7 +145,7 @@ class CORE_EXPORT QgsLayerItem : public QgsDataItem
 
     /**
      * Returns layer's metadata, it may be a default constructed metadata
-     * if metadata are not explicitly set.
+     * if metadata is not explicitly set.
      * \since QGIS 3.28
      */
     const QgsLayerMetadata &layerMetadata() const;

src/core/metadata/qgsabstractlayermetadataprovider.cpp

@@ -17,8 +17,6 @@
 #include "qgsprovidermetadata.h"
 #include "qgsproviderregistry.h"
 #include "qgsfeedback.h"
-#include "qgsiconutils.h"
-#include <QIcon>
 
 QList<QgsLayerMetadataProviderResult> QgsLayerMetadataSearchResults::metadata() const
 {
@@ -118,24 +116,4 @@ void QgsLayerMetadataProviderResult::setStandardUri( const QString &standardUri
   mStandardUri = standardUri;
 }
 
-QIcon QgsLayerMetadataProviderResult::layerTypeIcon() const
-{
-  if ( layerType() == QgsMapLayerType::VectorLayer )
-  {
-    switch ( geometryType() )
-    {
-      case QgsWkbTypes::NullGeometry:
-        return QgsIconUtils::iconTable();
-      case QgsWkbTypes::PointGeometry:
-        return QgsIconUtils::iconPoint();
-      case QgsWkbTypes::LineGeometry:
-        return QgsIconUtils::iconLine();
-      case QgsWkbTypes::PolygonGeometry:
-        return QgsIconUtils::iconPolygon();
-      default:
-        return QgsIconUtils::iconDefaultLayer();
-    }
-  }
-  return QgsIconUtils::iconForLayerType( layerType() );
-}
 

src/core/metadata/qgsabstractlayermetadataprovider.h

@@ -142,10 +142,6 @@ class CORE_EXPORT QgsLayerMetadataProviderResult: public QgsLayerMetadata
      */
     void setStandardUri( const QString &standardUri );
 
-    /**
-     * Returns the icon for the layer type.
-     */
-    QIcon layerTypeIcon() const;
 
   private:
 
@@ -223,6 +219,8 @@ class CORE_EXPORT QgsAbstractLayerMetadataProvider
 
   public:
 
+    virtual ~QgsAbstractLayerMetadataProvider() = default;
+
     /**
      * Returns the id of the layer metadata provider implementation, usually the name of the data provider
      * but it may be another unique identifier.
@@ -239,8 +237,6 @@ class CORE_EXPORT QgsAbstractLayerMetadataProvider
      */
     virtual QgsLayerMetadataSearchResults search( const QgsMetadataSearchContext &searchContext, const QString &searchString = QString(), const QgsRectangle &geographicExtent = QgsRectangle(), QgsFeedback *feedback = nullptr ) const = 0;
 
-    virtual ~QgsAbstractLayerMetadataProvider() = default;
-
 };
 
 #endif // QGSABSTRACTLAYERMETADATAPROVIDER_H

src/core/metadata/qgslayermetadata.cpp

@@ -428,11 +428,6 @@ bool QgsLayerMetadata::operator==( const QgsLayerMetadata &other )  const
 
 bool QgsLayerMetadata::contains( const QString &searchString ) const
 {
-  if ( searchString.isEmpty() )
-  {
-    return true;
-  }
-
   if ( title().contains( searchString, Qt::CaseInsensitive ) ||
        identifier().contains( searchString, Qt::CaseInsensitive ) ||
        abstract().contains( searchString, Qt::CaseInsensitive ) )

src/core/metadata/qgslayermetadata.h

@@ -172,11 +172,6 @@ class CORE_EXPORT QgsLayerMetadata : public QgsAbstractMetadataBase
      */
     QgsLayerMetadata() = default;
 
-    /**
-     * Destructor.
-     */
-    ~QgsLayerMetadata( ) = default;
-
     /**
      * Copy constructor for QgsLayerMetadataProviderResult from \a other.
      * \since QGIS 3.28

src/core/qgsiconutils.cpp

@@ -25,7 +25,12 @@
 QIcon QgsIconUtils::iconForWkbType( QgsWkbTypes::Type type )
 {
   const QgsWkbTypes::GeometryType geomType = QgsWkbTypes::geometryType( QgsWkbTypes::Type( type ) );
-  switch ( geomType )
+  return iconForGeometryType( geomType );
+}
+
+QIcon QgsIconUtils::iconForGeometryType( QgsWkbTypes::GeometryType typeGroup )
+{
+  switch ( typeGroup )
   {
     case QgsWkbTypes::NullGeometry:
       return iconTable();

src/core/qgsiconutils.h

@@ -40,6 +40,12 @@ class CORE_EXPORT QgsIconUtils
      */
     static QIcon iconForWkbType( QgsWkbTypes::Type type );
 
+    /**
+     * Returns the icon for a vector layer whose geometry \a typeGroup is provided.
+     * 1since QGIS 3.28
+     */
+    static QIcon iconForGeometryType( QgsWkbTypes::GeometryType typeGroup );
+
     /**
      * Returns an icon representing point geometries.
      */

src/gui/CMakeLists.txt

@@ -530,6 +530,7 @@ set(QGIS_GUI_SRCS
   qgskeyvaluewidget.cpp
   qgslayermetadatasearchwidget.cpp
   qgslayermetadataresultsmodel.cpp
+  qgslayermetadatasourceselectprovider.cpp
   qgslayermetadataresultsproxymodel.cpp
   qgslistwidget.cpp
   qgslegendfilterbutton.cpp
@@ -795,6 +796,7 @@ set(QGIS_GUI_HDRS
   qgslayermetadatasearchwidget.h
   qgslayermetadataresultsmodel.h
   qgslayermetadataresultsproxymodel.h
+  qgslayermetadatasourceselectprovider.h
   qgslegendfilterbutton.h
   qgslegendpatchshapebutton.h
   qgslegendpatchshapewidget.h

src/gui/qgsabstractdatasourcewidget.h

@@ -38,6 +38,10 @@ class QgsBrowserModel;
  * This class provides common functionality and the interface for all
  * source select dialogs used by data providers to configure data sources
  * and add layers.
+ *
+ * The implementation is generic enough to handle other layer search and
+ * selection widgets.
+ *
  * \since QGIS 3.0
  */
 class GUI_EXPORT QgsAbstractDataSourceWidget : public QDialog

src/gui/qgsdatasourcemanagerdialog.cpp

@@ -67,43 +67,7 @@ QgsDataSourceManagerDialog::QgsDataSourceManagerDialog( QgsBrowserGuiModel *brow
   connect( mBrowserWidget, &QgsBrowserDockWidget::connectionsChanged, this, &QgsDataSourceManagerDialog::connectionsChanged );
   connect( this, &QgsDataSourceManagerDialog::updateProjectHome, mBrowserWidget->browserWidget(), &QgsBrowserWidget::updateProjectHome );
 
-  // METADATA Add the metadata search widget as the second stacked widget
-  mLayerMetadataSearchWidget = new QgsLayerMetadataSearchWidget( mMapCanvas, this );
-  connect( mLayerMetadataSearchWidget, &QgsLayerMetadataSearchWidget::rejected, this, &QgsDataSourceManagerDialog::reject );
-  ui->mOptionsStackedWidget->addWidget( mLayerMetadataSearchWidget );
-  mPageNames.append( QStringLiteral( "metadata" ) );
-
-  connect( mLayerMetadataSearchWidget, &QgsLayerMetadataSearchWidget::addLayers, this, [ = ]( const QList< QgsLayerMetadataProviderResult > &metadataResults )
-  {
-    for ( const QgsLayerMetadataProviderResult &metadata : std::as_const( metadataResults ) )
-    {
-      switch ( metadata.layerType() )
-      {
-        case QgsMapLayerType::VectorLayer:
-        {
-          emit addVectorLayer( metadata.uri(), metadata.identifier(), metadata.dataProviderName() );
-          break;
-        };
-        case QgsMapLayerType::RasterLayer:
-        {
-          emit addRasterLayer( metadata.uri(), metadata.identifier(), metadata.dataProviderName() );
-          break;
-        }
-        case QgsMapLayerType::MeshLayer:
-        {
-          emit addMeshLayer( metadata.uri(), metadata.identifier(), metadata.dataProviderName() );
-          break;
-        }
-        default: // Unsupported!
-        {
-          // Ignore
-          break;
-        }
-      }
-    }
-  } );
-
-  // Add provider dialogs
+  // Add registered source select dialogs
   const QList<QgsSourceSelectProvider *> sourceSelectProviders = QgsGui::sourceSelectProviderRegistry()->providers( );
   for ( QgsSourceSelectProvider *provider : sourceSelectProviders )
   {

src/gui/qgsgui.cpp

@@ -59,6 +59,7 @@
 #include "qgsmaptoolshaperegistry.h"
 #include "qgssettingsregistrygui.h"
 #include "qgshistoryproviderregistry.h"
+#include "qgslayermetadatasourceselectprovider.h"
 
 #include <QPushButton>
 #include <QToolButton>
@@ -293,6 +294,7 @@ QgsGui::QgsGui()
   mProjectStorageGuiRegistry->initializeFromProviderGuiRegistry( mProviderGuiRegistry );
   mDataItemGuiProviderRegistry->initializeFromProviderGuiRegistry( mProviderGuiRegistry );
   mSourceSelectProviderRegistry->initializeFromProviderGuiRegistry( mProviderGuiRegistry );
+  mSourceSelectProviderRegistry->addProvider( new QgsLayerMetadataSourceSelectProvider() );
   mSubsetStringEditorProviderRegistry->initializeFromProviderGuiRegistry( mProviderGuiRegistry );
   mProviderSourceWidgetProviderRegistry->initializeFromProviderGuiRegistry( mProviderGuiRegistry );
 

src/gui/qgslayermetadataresultsmodel.cpp

@@ -18,6 +18,9 @@
 #include "qgsapplication.h"
 #include "qgslayermetadataproviderregistry.h"
 #include "qgslayermetadataformatter.h"
+#include "qgsiconutils.h"
+#include "qgsproviderregistry.h"
+#include "qgsprovidermetadata.h"
 #include <QIcon>
 
 QgsLayerMetadataResultsModel::QgsLayerMetadataResultsModel( const QgsMetadataSearchContext &searchContext, QObject *parent )
@@ -60,7 +63,11 @@ QVariant QgsLayerMetadataResultsModel::data( const QModelIndex &index, int role
           case Sections::Abstract:
             return mResult.metadata().at( index.row() ).abstract();
           case Sections::DataProviderName:
-            return mResult.metadata().at( index.row() ).dataProviderName();
+          {
+            const QString providerName { mResult.metadata().at( index.row() ).dataProviderName() };
+            QgsProviderMetadata *md { QgsProviderRegistry::instance()->providerMetadata( providerName ) };
+            return md ? md->description() : providerName;
+          }
           case Sections::GeometryType:
             return QgsWkbTypes::geometryDisplayString( mResult.metadata().at( index.row() ).geometryType() );
           default:
@@ -80,7 +87,7 @@ QVariant QgsLayerMetadataResultsModel::data( const QModelIndex &index, int role
       {
         if ( index.column() == 0 )
         {
-          return  mResult.metadata().at( index.row() ).layerTypeIcon();
+          return QgsIconUtils::iconForGeometryType( mResult.metadata().at( index.row() ).geometryType() );
         }
         break;
       }

src/gui/qgslayermetadatasearchwidget.cpp

@@ -20,18 +20,20 @@
 #include "qgsmapcanvas.h"
 #include "qgsprojectviewsettings.h"
 
-QgsLayerMetadataSearchWidget::QgsLayerMetadataSearchWidget( const QgsMapCanvas *mapCanvas, QWidget *parent )
-  : QWidget( parent )
-  , mMapCanvas( mapCanvas )
+
+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();
 
-  QgsLayerMetadataResultsModel *sourceModel = new QgsLayerMetadataResultsModel( searchContext, this );
+  mSourceModel = new QgsLayerMetadataResultsModel( searchContext, this );
   mProxyModel = new QgsLayerMetadataResultsProxyModel( this );
-  mProxyModel->setSourceModel( sourceModel );
+  mProxyModel->setSourceModel( mSourceModel );
   mMetadataTableView->setModel( mProxyModel );
   mMetadataTableView->setSortingEnabled( true );
   mMetadataTableView->sortByColumn( 0, Qt::SortOrder::AscendingOrder );
@@ -61,8 +63,8 @@ QgsLayerMetadataSearchWidget::QgsLayerMetadataSearchWidget( const QgsMapCanvas *
     }
   };
 
-  connect( sourceModel, &QgsLayerMetadataResultsModel::progressChanged, mProgressBar, &QProgressBar::setValue );
-  connect( sourceModel, &QgsLayerMetadataResultsModel::progressChanged, this,  [ = ]( int progress )
+  connect( mSourceModel, &QgsLayerMetadataResultsModel::progressChanged, mProgressBar, &QProgressBar::setValue );
+  connect( mSourceModel, &QgsLayerMetadataResultsModel::progressChanged, this,  [ = ]( int progress )
   {
     if ( progress == 100 )
     {
@@ -71,66 +73,29 @@ QgsLayerMetadataSearchWidget::QgsLayerMetadataSearchWidget( const QgsMapCanvas *
     }
   } );
 
-  connect( mAbortPushButton, &QPushButton::clicked, sourceModel, [ = ]( bool )
+  connect( mAbortPushButton, &QPushButton::clicked, mSourceModel, [ = ]( bool )
   {
     if ( ! mIsLoading )
     {
       mIsLoading = true;
-      sourceModel->reloadAsync( );
+      mSourceModel->reloadAsync( );
     }
     else
     {
-      sourceModel->cancel();
+      mSourceModel->cancel();
       mIsLoading = false;
     }
     updateLoadBtn();
   } );
 
-
-  // Setup buttons
-  mButtonBox->setStandardButtons( QDialogButtonBox::Apply | QDialogButtonBox::Close | QDialogButtonBox::Help );
-#ifdef Q_OS_MACX
-  mButtonBox->setStyleSheet( "* { button-layout: 2 }" );
-#endif
-  mAddButton = mButtonBox->button( QDialogButtonBox::Apply );
-  mAddButton->setText( tr( "&Add" ) );
-  mAddButton->setToolTip( tr( "Add selected layers to map" ) );
-  mAddButton->setEnabled( false );
-  connect( mAddButton, &QPushButton::clicked, this, [ = ]( bool )
-  {
-    const QModelIndexList &selectedIndexes { mMetadataTableView->selectionModel()->selectedRows() };
-    if ( ! selectedIndexes.isEmpty() )
-    {
-      QList< QgsLayerMetadataProviderResult > layersToAdd;
-      for ( const auto &selectedIndex : std::as_const( selectedIndexes ) )
-      {
-        layersToAdd.push_back( sourceModel->data( mProxyModel->mapToSource( selectedIndex ), QgsLayerMetadataResultsModel::Roles::Metadata ).value<QgsLayerMetadataProviderResult>() );
-      }
-      emit addLayers( layersToAdd );
-    }
-
-  } );
-
   connect( mMetadataTableView->selectionModel(), &QItemSelectionModel::selectionChanged, this, [ = ]( const QItemSelection &, const QItemSelection & )
   {
-    mAddButton->setEnabled( mMetadataTableView->selectionModel()->hasSelection() );
+    emit enableButtons( mMetadataTableView->selectionModel()->hasSelection() );
   } );
 
-  QPushButton *closeButton = mButtonBox->button( QDialogButtonBox::Close );
-  closeButton->setToolTip( tr( "Close this dialog without adding any layer" ) );
-  connect( closeButton, &QPushButton::clicked, this, &QgsLayerMetadataSearchWidget::rejected );
-
   connect( mSearchFilterLineEdit, &QLineEdit::textEdited, mProxyModel, &QgsLayerMetadataResultsProxyModel::setFilterString );
   connect( mExtentFilterComboBox, qOverload<int>( &QComboBox::currentIndexChanged ), this, &QgsLayerMetadataSearchWidget::updateExtentFilter );
 
-  if ( mMapCanvas )
-  {
-    connect( mMapCanvas, &QgsMapCanvas::extentsChanged, this, [ = ]
-    {
-      updateExtentFilter( mExtentFilterComboBox->currentIndex() );
-    } );
-  }
-
   connect( QgsProject::instance(), &QgsProject::layersAdded, this, [ = ]( const QList<QgsMapLayer *> & )
   {
     updateExtentFilter( mExtentFilterComboBox->currentIndex() );
@@ -142,18 +107,30 @@ QgsLayerMetadataSearchWidget::QgsLayerMetadataSearchWidget( const QgsMapCanvas *
   } );
 
   // Start loading metadata in the model
-  sourceModel->reloadAsync();
+  mSourceModel->reloadAsync();
   mIsLoading = true;
 
 }
 
+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 && mMapCanvas )
+  if ( index == 1 && mapCanvas() )
   {
-    QgsCoordinateTransform ct( mMapCanvas->mapSettings().destinationCrs(), QgsCoordinateReferenceSystem::fromEpsgId( 4326 ), QgsProject::instance()->transformContext() );
+    QgsCoordinateTransform ct( mapCanvas()->mapSettings().destinationCrs(), QgsCoordinateReferenceSystem::fromEpsgId( 4326 ), QgsProject::instance()->transformContext() );
     ct.setBallparkTransformsAreAppropriate( true );
-    mProxyModel->setFilterExtent( ct.transformBoundingBox( mMapCanvas->extent() ) );
+    mProxyModel->setFilterExtent( ct.transformBoundingBox( mapCanvas()->extent() ) );
   }
   else if ( index == 2 )
   {
@@ -167,3 +144,48 @@ void QgsLayerMetadataSearchWidget::updateExtentFilter( int index )
     mProxyModel->setFilterExtent( QgsRectangle( ) );
   }
 }
+
+void QgsLayerMetadataSearchWidget::refresh()
+{
+  mSourceModel->reloadAsync();
+}
+
+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 ), QgsLayerMetadataResultsModel::Roles::Metadata ).value<QgsLayerMetadataProviderResult>() };
+      switch ( metadataResult.layerType() )
+      {
+        case QgsMapLayerType::RasterLayer:
+        {
+          emit addRasterLayer( metadataResult.uri(), metadataResult.identifier(), metadataResult.dataProviderName() );
+          break;
+        }
+        case QgsMapLayerType::VectorLayer:
+        {
+          emit addVectorLayer( metadataResult.uri(), metadataResult.identifier(), metadataResult.dataProviderName() );
+          break;
+        }
+        case QgsMapLayerType::MeshLayer:
+        {
+          emit addMeshLayer( metadataResult.uri(), metadataResult.identifier(), metadataResult.dataProviderName() );
+        }
+        default:  // unsupported
+        {
+          // Ignore
+          break;
+        }
+      }
+    }
+  }
+}
+
+void QgsLayerMetadataSearchWidget::reset()
+{
+  mSearchFilterLineEdit->clear();
+  mExtentFilterComboBox->setCurrentIndex( 0 );
+}

src/gui/qgslayermetadatasearchwidget.h

@@ -21,9 +21,11 @@
 #include "ui_qgslayermetadatasearchwidget.h"
 #include "qgsfeedback.h"
 #include "qgsabstractlayermetadataprovider.h"
+#include "qgsabstractdatasourcewidget.h"
 
 class QgsMapCanvas;
 class QgsLayerMetadataResultsProxyModel;
+class QgsLayerMetadataResultsModel;
 
 /**
  * \ingroup gui
@@ -31,7 +33,7 @@ class QgsLayerMetadataResultsProxyModel;
  * It is designed to be embedded in the data source manager dialog.
  * \since QGIS 3.28
  */
-class GUI_EXPORT QgsLayerMetadataSearchWidget : public QWidget, private Ui::QgsLayerMetadataSearchWidget
+class GUI_EXPORT QgsLayerMetadataSearchWidget : public QgsAbstractDataSourceWidget, private Ui::QgsLayerMetadataSearchWidget
 {
     Q_OBJECT
   public:
@@ -41,28 +43,24 @@ class GUI_EXPORT QgsLayerMetadataSearchWidget : public QWidget, private Ui::QgsL
      * \param mapCanvas optional map canvas
      * \param parent optional parent
      */
-    explicit QgsLayerMetadataSearchWidget( const QgsMapCanvas *mapCanvas = nullptr, QWidget *parent = nullptr );
+    explicit QgsLayerMetadataSearchWidget( QWidget *parent = nullptr, Qt::WindowFlags fl = Qt::WindowFlags(), QgsProviderRegistry::WidgetMode widgetMode = QgsProviderRegistry::WidgetMode::None );
 
-  signals:
-
-    //! Emitted when the close button is clicked.
-    void rejected();
-
-    //! Emitted when layers have been selected for addition
-    void addLayers( const QList< QgsLayerMetadataProviderResult > &metadataResults );
+    void setMapCanvas( QgsMapCanvas *mapCanvas ) override;
 
   public slots:
 
     //! Updates the extent filter based on the combo box current item \a index.
     void updateExtentFilter( int index );
 
+    void refresh() override;
+    void addButtonClicked() override;
+    void reset() override;
+
   private:
 
-    const QgsMapCanvas *mMapCanvas = nullptr;
     QgsLayerMetadataResultsProxyModel *mProxyModel = nullptr;
     bool mIsLoading = false;
-    QPushButton *mAddButton = nullptr;
-
+    QgsLayerMetadataResultsModel *mSourceModel = nullptr;
 
 };
 

src/gui/qgslayermetadatasourceselectprovider.cpp

@@ -0,0 +1,50 @@
+/***************************************************************************
+  qgslayermetadatasourceselectprovider.cpp - QgsLayerMetadataSourceSelectProvider
+
+ ---------------------
+ begin                : 6.9.2022
+ 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 "qgslayermetadatasourceselectprovider.h"
+#include "qgslayermetadatasearchwidget.h"
+#include "qgsapplication.h"
+
+QgsLayerMetadataSourceSelectProvider::QgsLayerMetadataSourceSelectProvider()
+  : QgsSourceSelectProvider()
+{
+
+}
+
+QString QgsLayerMetadataSourceSelectProvider::providerKey() const
+{
+  return QStringLiteral( "layermetadata" );
+
+}
+
+QString QgsLayerMetadataSourceSelectProvider::text() const
+{
+  return QObject::tr( "Layer Metadata" );
+}
+
+QIcon QgsLayerMetadataSourceSelectProvider::icon() const
+{
+  return QgsApplication::getThemeIcon( QStringLiteral( "search.svg" ) );
+}
+
+QgsAbstractDataSourceWidget *QgsLayerMetadataSourceSelectProvider::createDataSourceWidget( QWidget *parent, Qt::WindowFlags fl, QgsProviderRegistry::WidgetMode widgetMode ) const
+{
+  return new QgsLayerMetadataSearchWidget( parent, fl, widgetMode );
+}
+
+int QgsLayerMetadataSourceSelectProvider::ordering() const
+{
+  return OrderSearchProvider;
+}

src/gui/qgslayermetadatasourceselectprovider.h

@@ -0,0 +1,43 @@
+/***************************************************************************
+  qgslayermetadatasourceselectprovider.h - QgsLayerMetadataSourceSelectProvider
+
+ ---------------------
+ begin                : 6.9.2022
+ 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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+#ifndef QGSLAYERMETADATASOURCESELECTPROVIDER_H
+#define QGSLAYERMETADATASOURCESELECTPROVIDER_H
+
+#include "qgssourceselectprovider.h"
+#include "qgis_gui.h"
+
+/**
+ * \ingroup gui
+ * \brief Source select provider for layer metadata.
+ *
+ * \since QGIS 3.28
+ */
+class GUI_EXPORT QgsLayerMetadataSourceSelectProvider : public QgsSourceSelectProvider
+{
+
+  public:
+    QgsLayerMetadataSourceSelectProvider();
+
+    // QgsSourceSelectProvider interface
+  public:
+    QString providerKey() const override;
+    QString text() const override;
+    QIcon icon() const override;
+    QgsAbstractDataSourceWidget *createDataSourceWidget( QWidget *parent, Qt::WindowFlags fl, QgsProviderRegistry::WidgetMode widgetMode ) const override;
+    int ordering() const override;
+};
+
+#endif // QGSLAYERMETADATASOURCESELECTPROVIDER_H

src/gui/qgssourceselectprovider.h

@@ -43,7 +43,8 @@ class GUI_EXPORT QgsSourceSelectProvider
       OrderDatabaseProvider = 1000, //!< Starting point for database providers (e.g. Postgres)
       OrderRemoteProvider = 2000, //!< Starting point for remote (online) providers (e.g. WMS)
       OrderGeoCmsProvider = 3000, //!< Starting point for GeoCMS type providers (e.g. GeoNode)
-      OrderOtherProvider = 4000, //!< Starting point for other providers (e.g. plugin based providers)
+      OrderSearchProvider = 4000, //!< Starting point for search providers (e.g. Layer Metadata)
+      OrderOtherProvider = 5000, //!< Starting point for other providers (e.g. plugin based providers)
     };
 
     virtual ~QgsSourceSelectProvider() = default;

src/ui/qgsdatasourcemanagerdialog.ui

@@ -116,15 +116,6 @@
             <normaloff>:/images/themes/default/mActionFileOpen.svg</normaloff>:/images/themes/default/mActionFileOpen.svg</iconset>
           </property>
          </item>
-         <item>
-          <property name="text">
-           <string>Metadata</string>
-          </property>
-          <property name="icon">
-           <iconset resource="../../images/images.qrc">
-            <normaloff>:/images/themes/default/propertyicons/metadata.svg</normaloff>:/images/themes/default/propertyicons/metadata.svg</iconset>
-          </property>
-         </item>
         </widget>
        </item>
       </layout>

src/ui/qgslayermetadatasearchwidget.ui

@@ -24,7 +24,7 @@
       </widget>
      </item>
      <item>
-      <widget class="QLineEdit" name="mSearchFilterLineEdit"/>
+      <widget class="QgsFilterLineEdit" name="mSearchFilterLineEdit"/>
      </item>
      <item>
       <widget class="QLabel" name="label_2">
@@ -74,12 +74,19 @@
    <item>
     <widget class="QDialogButtonBox" name="mButtonBox">
      <property name="standardButtons">
-      <set>QDialogButtonBox::Close|QDialogButtonBox::Help</set>
+      <set>QDialogButtonBox::Apply|QDialogButtonBox::Close|QDialogButtonBox::Help</set>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>QgsFilterLineEdit</class>
+   <extends>QLineEdit</extends>
+   <header>qgsfilterlineedit.h</header>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections/>
 </ui>

tests/src/python/CMakeLists.txt

@@ -145,6 +145,7 @@ ADD_PYTHON_TEST(PyQgsLabelThinningSettings test_qgslabelthinningsettings.py)
 ADD_PYTHON_TEST(PyQgsLayerMetadata test_qgslayermetadata.py)
 ADD_PYTHON_TEST(PyQgsLayerMetadataProviderPython test_qgslayermetadataprovider_python.py)
 ADD_PYTHON_TEST(PyQgsLayerMetadataProviderOgr test_qgslayermetadataprovider_ogr.py)
+ADD_PYTHON_TEST(PyQgsLayerMetadataResultsModel test_qgslayermetadataresultsmodel.py)
 ADD_PYTHON_TEST(PyQgsLayerTreeMapCanvasBridge test_qgslayertreemapcanvasbridge.py)
 ADD_PYTHON_TEST(PyQgsLayerTree test_qgslayertree.py)
 ADD_PYTHON_TEST(PyQgsLayerTreeView test_qgslayertreeview.py)

tests/src/python/test_qgslayermetadataresultsmodel.py

@@ -0,0 +1,130 @@
+# coding=utf-8
+""""Base test for layer metadata models
+
+.. note:: 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.
+
+"""
+
+__author__ = 'elpaso@itopen.it'
+__date__ = '2022-08-19'
+__copyright__ = 'Copyright 2022, ItOpen'
+
+import os
+from osgeo import ogr
+
+from qgis.core import (
+    QgsVectorLayer,
+    QgsProviderRegistry,
+    QgsWkbTypes,
+    QgsLayerMetadata,
+    QgsProviderMetadata,
+    QgsBox3d,
+    QgsRectangle,
+    QgsMetadataSearchContext,
+)
+
+from qgis.gui import (
+    QgsLayerMetadataResultsModel,
+    QgsLayerMetadataResultsProxyModel,
+)
+
+from qgis.PyQt.QtTest import QAbstractItemModelTester
+
+from qgis.PyQt.QtCore import QCoreApplication, QTemporaryDir, QVariant, Qt
+from utilities import compareWkt, unitTestDataPath
+from qgis.testing import start_app, TestCase
+import unittest
+
+QGIS_APP = start_app()
+NUM_LAYERS = 20
+
+
+class TestQgsLayerMetadataResultModels(TestCase):
+    """Base test for layer metadata provider models
+    """
+
+    @classmethod
+    def setUpClass(cls):
+        """Run before all tests"""
+
+        QCoreApplication.setOrganizationName("QGIS_Test")
+        QCoreApplication.setOrganizationDomain(cls.__name__)
+        QCoreApplication.setApplicationName(cls.__name__)
+
+    def setUp(self):
+        super().setUp()
+
+        self.temp_dir = QTemporaryDir()
+        self.temp_path = self.temp_dir.path()
+        self.temp_gpkg = os.path.join(self.temp_path, 'test.gpkg')
+
+        ds = ogr.GetDriverByName('GPKG').CreateDataSource(self.temp_gpkg)
+
+        md = QgsProviderRegistry.instance().providerMetadata('ogr')
+        self.assertIsNotNone(md)
+        self.assertTrue(bool(md.providerCapabilities() & QgsProviderMetadata.ProviderCapability.SaveLayerMetadata))
+        self.conn = md.createConnection(self.temp_gpkg, {})
+        self.conn.store('test_conn')
+
+        for i in range(NUM_LAYERS):
+            lyr = ds.CreateLayer("layer_%s" % i, geom_type=ogr.wkbPoint, options=['SPATIAL_INDEX=NO'])
+            lyr.CreateField(ogr.FieldDefn('text_field', ogr.OFTString))
+            f = ogr.Feature(lyr.GetLayerDefn())
+            f['text_field'] = 'foo'
+            f.SetGeometry(ogr.CreateGeometryFromWkt('POINT(%s %s)' % (i, i + 0.01)))
+            lyr.CreateFeature(f)
+            f = ogr.Feature(lyr.GetLayerDefn())
+            f['text_field'] = 'bar'
+            f.SetGeometry(ogr.CreateGeometryFromWkt('POINT(%s %s)' % (i + 0.03, i + 0.04)))
+            lyr.CreateFeature(f)
+            f = None
+
+        ds = None
+
+        for t in self.conn.tables():
+            layer_uri = self.conn.tableUri('', t.tableName())
+            vl = QgsVectorLayer(layer_uri, t.tableName(), 'ogr')
+            self.assertTrue(vl.isValid())
+            metadata = vl.metadata()
+            ext = QgsLayerMetadata.Extent()
+            spatial_ext = QgsLayerMetadata.SpatialExtent()
+            spatial_ext.bounds = QgsBox3d(vl.extent())
+            spatial_ext.crs = vl.crs()
+            ext.setSpatialExtents([spatial_ext])
+            metadata.setExtent(ext)
+            metadata.setIdentifier(t.tableName())
+            self.assertTrue(md.saveLayerMetadata(layer_uri, metadata)[0])
+
+    def testModels(self):
+
+        search_context = QgsMetadataSearchContext()
+        model = QgsLayerMetadataResultsModel(search_context)
+        proxy_model = QgsLayerMetadataResultsProxyModel()
+        proxy_model.setSourceModel(model)
+        tester = QAbstractItemModelTester(proxy_model, QAbstractItemModelTester.FailureReportingMode.Fatal)
+        model.reload()
+        proxy_model.setFilterString('_1')
+        self.assertEqual(proxy_model.rowCount(), 11)
+        proxy_model.setFilterString('_11')
+        self.assertEqual(proxy_model.rowCount(), 1)
+        metadata = proxy_model.data(proxy_model.index(0, 0), QgsLayerMetadataResultsModel.Roles.Metadata)
+        self.assertEqual(metadata.identifier(), 'layer_11')
+        proxy_model.setFilterString('')
+        self.assertEqual(proxy_model.rowCount(), 20)
+        proxy_model.setFilterExtent(QgsRectangle(0, 0, 2, 2.001))
+        self.assertEqual(proxy_model.rowCount(), 2)
+        model.reload()
+        self.assertEqual(proxy_model.rowCount(), 2)
+        proxy_model.setFilterExtent(QgsRectangle())
+        metadata = proxy_model.data(proxy_model.index(0, 0), QgsLayerMetadataResultsModel.Roles.Metadata)
+        self.assertEqual(metadata.identifier(), 'layer_0')
+        proxy_model.sort(0, Qt.DescendingOrder)
+        metadata = proxy_model.data(proxy_model.index(0, 0), QgsLayerMetadataResultsModel.Roles.Metadata)
+        self.assertEqual(metadata.identifier(), 'layer_9')
+
+
+if __name__ == '__main__':
+    unittest.main()