Add a minimal data provider for vector tile layers

Fixes #45153

python/core/auto_generated/vectortile/qgsvectortilelayer.sip.in

@@ -86,22 +86,18 @@ Constructs a new vector tile layer
 
     virtual QgsVectorTileLayer *clone() const /Factory/;
 
+    virtual QgsDataProvider *dataProvider();
 
     virtual QgsMapLayerRenderer *createMapRenderer( QgsRenderContext &rendererContext ) /Factory/;
 
-
     virtual bool readXml( const QDomNode &layerNode, QgsReadWriteContext &context );
 
-
     virtual bool writeXml( QDomNode &layerNode, QDomDocument &doc, const QgsReadWriteContext &context ) const;
 
-
      virtual bool readSymbology( const QDomNode &node, QString &errorMessage,
                         QgsReadWriteContext &context, StyleCategories categories = AllStyleCategories );
-
      virtual bool writeSymbology( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context,
                          StyleCategories categories = AllStyleCategories ) const;
-
     virtual void setTransformContext( const QgsCoordinateTransformContext &transformContext );
 
     virtual QString loadDefaultStyle( bool &resultFlag /Out/ );
@@ -176,6 +172,7 @@ Returns whether to render also borders of tiles (useful for debugging)
 };
 
 
+
 /************************************************************************
  * This file has been generated automatically from                      *
  *                                                                      *

src/core/vectortile/qgsvectortilelayer.cpp

@@ -197,6 +197,16 @@ QgsVectorTileLayer *QgsVectorTileLayer::clone() const
   return layer;
 }
 
+QgsDataProvider *QgsVectorTileLayer::dataProvider()
+{
+  return mDataProvider.get();
+}
+
+const QgsDataProvider *QgsVectorTileLayer::dataProvider() const
+{
+  return mDataProvider.get();
+}
+
 QgsMapLayerRenderer *QgsVectorTileLayer::createMapRenderer( QgsRenderContext &rendererContext )
 {
   return new QgsVectorTileLayerRenderer( this, rendererContext );
@@ -694,3 +704,41 @@ QgsVectorTileLabeling *QgsVectorTileLayer::labeling() const
 {
   return mLabeling.get();
 }
+
+
+
+//
+// QgsAnnotationLayerDataProvider
+//
+///@cond PRIVATE
+QgsVectorTileDataProvider::QgsVectorTileDataProvider(
+  const ProviderOptions &options,
+  QgsDataProvider::ReadFlags flags )
+  : QgsDataProvider( QString(), options, flags )
+{}
+
+QgsCoordinateReferenceSystem QgsVectorTileDataProvider::crs() const
+{
+  return QgsCoordinateReferenceSystem();
+}
+
+QString QgsVectorTileDataProvider::name() const
+{
+  return QStringLiteral( "vectortile" );
+}
+
+QString QgsVectorTileDataProvider::description() const
+{
+  return QString();
+}
+
+QgsRectangle QgsVectorTileDataProvider::extent() const
+{
+  return QgsRectangle();
+}
+
+bool QgsVectorTileDataProvider::isValid() const
+{
+  return true;
+}
+///@endcond

src/core/vectortile/qgsvectortilelayer.h

@@ -100,19 +100,15 @@ class CORE_EXPORT QgsVectorTileLayer : public QgsMapLayer
     // implementation of virtual functions from QgsMapLayer
 
     QgsVectorTileLayer *clone() const override SIP_FACTORY;
-
+    QgsDataProvider *dataProvider() override;
+    const QgsDataProvider *dataProvider() const override SIP_SKIP;
     QgsMapLayerRenderer *createMapRenderer( QgsRenderContext &rendererContext ) override SIP_FACTORY;
-
     bool readXml( const QDomNode &layerNode, QgsReadWriteContext &context ) override;
-
     bool writeXml( QDomNode &layerNode, QDomDocument &doc, const QgsReadWriteContext &context ) const override;
-
     bool readSymbology( const QDomNode &node, QString &errorMessage,
                         QgsReadWriteContext &context, StyleCategories categories = AllStyleCategories ) override;
-
     bool writeSymbology( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context,
                          StyleCategories categories = AllStyleCategories ) const override;
-
     void setTransformContext( const QgsCoordinateTransformContext &transformContext ) override;
     QString loadDefaultStyle( bool &resultFlag SIP_OUT ) override;
 
@@ -199,8 +195,35 @@ class CORE_EXPORT QgsVectorTileLayer : public QgsMapLayer
 
     QVariantMap mArcgisLayerConfiguration;
 
+    std::unique_ptr< QgsDataProvider > mDataProvider;
+
     bool setupArcgisVectorTileServiceConnection( const QString &uri, const QgsDataSourceUri &dataSourceUri );
 };
 
+#ifndef SIP_RUN
+///@cond PRIVATE
+
+/**
+ * A minimal data provider for vector tile layers.
+ *
+ * \since QGIS 3.22
+ */
+class QgsVectorTileDataProvider : public QgsDataProvider
+{
+    Q_OBJECT
+
+  public:
+    QgsVectorTileDataProvider( const QgsDataProvider::ProviderOptions &providerOptions,
+                               QgsDataProvider::ReadFlags flags );
+    QgsCoordinateReferenceSystem crs() const override;
+    QString name() const override;
+    QString description() const override;
+    QgsRectangle extent() const override;
+    bool isValid() const override;
+
+};
+///@endcond
+#endif
+
 
 #endif // QGSVECTORTILELAYER_H