Add a minimal data provider for annotation layers

Required for some nice things, like avoiding rendering slower annotation layers in canvas preview jobs
qgis · Aug 31, 2021 · b09994a · b09994a
1 parent 47bcf09
commit b09994a
Show file tree

Hide file tree

Showing 3 changed files with 81 additions and 0 deletions.
diff --git a/python/core/auto_generated/annotations/qgsannotationlayer.sip.in b/python/core/auto_generated/annotations/qgsannotationlayer.sip.in
@@ -132,9 +132,12 @@ The optional ``feedback`` argument can be used to cancel the search early.
 
     virtual bool supportsEditing() const;
 
+    virtual QgsDataProvider *dataProvider();
+
 
 };
 
+
 /************************************************************************
  * This file has been generated automatically from                      *
  *                                                                      *

diff --git a/src/core/annotations/qgsannotationlayer.cpp b/src/core/annotations/qgsannotationlayer.cpp
@@ -103,12 +103,14 @@ QgsAnnotationLayer::QgsAnnotationLayer( const QString &name, const LayerOptions
 {
   mShouldValidateCrs = false;
   mValid = true;
+  mDataProvider = new QgsAnnotationLayerDataProvider( QgsDataProvider::ProviderOptions(), QgsDataProvider::ReadFlags() );
 }
 
 QgsAnnotationLayer::~QgsAnnotationLayer()
 {
   emit willBeDeleted();
   qDeleteAll( mItems );
+  delete mDataProvider;
 }
 
 void QgsAnnotationLayer::reset()
@@ -385,3 +387,50 @@ bool QgsAnnotationLayer::supportsEditing() const
 {
   return true;
 }
+
+QgsDataProvider *QgsAnnotationLayer::dataProvider()
+{
+  return mDataProvider;
+}
+
+const QgsDataProvider *QgsAnnotationLayer::dataProvider() const
+{
+  return mDataProvider;
+}
+
+
+//
+// QgsAnnotationLayerDataProvider
+//
+///@cond PRIVATE
+QgsAnnotationLayerDataProvider::QgsAnnotationLayerDataProvider(
+  const ProviderOptions &options,
+  QgsDataProvider::ReadFlags flags )
+  : QgsDataProvider( QString(), options, flags )
+{}
+
+QgsCoordinateReferenceSystem QgsAnnotationLayerDataProvider::crs() const
+{
+  return QgsCoordinateReferenceSystem();
+}
+
+QString QgsAnnotationLayerDataProvider::name() const
+{
+  return QStringLiteral( "annotation" );
+}
+
+QString QgsAnnotationLayerDataProvider::description() const
+{
+  return QString();
+}
+
+QgsRectangle QgsAnnotationLayerDataProvider::extent() const
+{
+  return QgsRectangle();
+}
+
+bool QgsAnnotationLayerDataProvider::isValid() const
+{
+  return true;
+}
+///@endcond
diff --git a/src/core/annotations/qgsannotationlayer.h b/src/core/annotations/qgsannotationlayer.h
@@ -148,6 +148,8 @@ class CORE_EXPORT QgsAnnotationLayer : public QgsMapLayer
     bool readSymbology( const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, StyleCategories categories = AllStyleCategories ) override;
     bool isEditable() const override;
     bool supportsEditing() const override;
+    QgsDataProvider *dataProvider() override;
+    const QgsDataProvider *dataProvider() const override SIP_SKIP;
 
   private:
     QMap<QString, QgsAnnotationItem *> mItems;
@@ -156,10 +158,37 @@ class CORE_EXPORT QgsAnnotationLayer : public QgsMapLayer
     std::unique_ptr< QgsAnnotationLayerSpatialIndex > mSpatialIndex;
     QSet< QString > mNonIndexedItems;
 
+    QgsDataProvider *mDataProvider = nullptr;
+
     QStringList queryIndex( const QgsRectangle &bounds, QgsFeedback *feedback = nullptr ) const;
 
     friend class QgsAnnotationLayerRenderer;
 
 };
 
+#ifndef SIP_RUN
+///@cond PRIVATE
+
+/**
+ * A minimal data provider for annotation layers.
+ *
+ * \since QGIS 3.22
+ */
+class QgsAnnotationLayerDataProvider : public QgsDataProvider
+{
+    Q_OBJECT
+
+  public:
+    QgsAnnotationLayerDataProvider( 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 // QGSANNOTATIONLAYER_H