[3d] Fix style copy/paste for 3D renderer (fixes #17540)

Author: wonder-sk

python/core/qgsmaplayer.sip

@@ -1155,6 +1155,18 @@ Read style manager's configuration (if any). To be called by subclasses.
 Write style manager's configuration (if exists). To be called by subclasses.
 %End
 
+    void writeCommonStyle( QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context ) const;
+%Docstring
+ Write style data common to all layer types
+.. versionadded:: 3.0
+%End
+
+    void readCommonStyle( const QDomElement &layerElement, const QgsReadWriteContext &context );
+%Docstring
+ Read style data common to all layer types
+.. versionadded:: 3.0
+%End
+
 
     void appendError( const QgsErrorMessage &error );
 %Docstring

src/core/qgsmaplayer.cpp

@@ -547,19 +547,6 @@ bool QgsMapLayer::readLayerXml( const QDomElement &layerElement, const QgsReadWr
   QDomElement metadataElem = layerElement.firstChildElement( QStringLiteral( "resourceMetadata" ) );
   mMetadata.readMetadataXml( metadataElem );
 
-  QgsAbstract3DRenderer *r3D = nullptr;
-  QDomElement renderer3DElem = layerElement.firstChildElement( QStringLiteral( "renderer-3d" ) );
-  if ( !renderer3DElem.isNull() )
-  {
-    QString type3D = renderer3DElem.attribute( QStringLiteral( "type" ) );
-    Qgs3DRendererAbstractMetadata *meta3D = QgsApplication::renderer3DRegistry()->rendererMetadata( type3D );
-    if ( meta3D )
-    {
-      r3D = meta3D->createRenderer( renderer3DElem, context );
-    }
-  }
-  setRenderer3D( r3D );
-
   return true;
 } // bool QgsMapLayer::readLayerXML
 
@@ -832,14 +819,6 @@ bool QgsMapLayer::writeLayerXml( QDomElement &layerElement, QDomDocument &docume
   mMetadata.writeMetadataXml( myMetadataElem, document );
   layerElement.appendChild( myMetadataElem );
 
-  if ( m3DRenderer )
-  {
-    QDomElement renderer3DElem = document.createElement( QStringLiteral( "renderer-3d" ) );
-    renderer3DElem.setAttribute( QStringLiteral( "type" ), m3DRenderer->type() );
-    m3DRenderer->writeXml( renderer3DElem, context );
-    layerElement.appendChild( renderer3DElem );
-  }
-
   // now append layer node to map layer node
 
   writeCustomProperties( layerElement, document );
@@ -1597,6 +1576,35 @@ bool QgsMapLayer::writeStyle( QDomNode &node, QDomDocument &doc, QString &errorM
 }
 
 
+void QgsMapLayer::writeCommonStyle( QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context ) const
+{
+  if ( m3DRenderer )
+  {
+    QDomElement renderer3DElem = document.createElement( QStringLiteral( "renderer-3d" ) );
+    renderer3DElem.setAttribute( QStringLiteral( "type" ), m3DRenderer->type() );
+    m3DRenderer->writeXml( renderer3DElem, context );
+    layerElement.appendChild( renderer3DElem );
+  }
+}
+
+
+void QgsMapLayer::readCommonStyle( const QDomElement &layerElement, const QgsReadWriteContext &context )
+{
+  QgsAbstract3DRenderer *r3D = nullptr;
+  QDomElement renderer3DElem = layerElement.firstChildElement( QStringLiteral( "renderer-3d" ) );
+  if ( !renderer3DElem.isNull() )
+  {
+    QString type3D = renderer3DElem.attribute( QStringLiteral( "type" ) );
+    Qgs3DRendererAbstractMetadata *meta3D = QgsApplication::renderer3DRegistry()->rendererMetadata( type3D );
+    if ( meta3D )
+    {
+      r3D = meta3D->createRenderer( renderer3DElem, context );
+    }
+  }
+  setRenderer3D( r3D );
+}
+
+
 QUndoStack *QgsMapLayer::undoStack()
 {
   return &mUndoStack;

src/core/qgsmaplayer.h

@@ -1095,6 +1095,18 @@ class CORE_EXPORT QgsMapLayer : public QObject
     //! Write style manager's configuration (if exists). To be called by subclasses.
     void writeStyleManager( QDomNode &layerNode, QDomDocument &doc ) const;
 
+    /**
+     * Write style data common to all layer types
+     * \since QGIS 3.0
+     */
+    void writeCommonStyle( QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context ) const;
+
+    /**
+     * Read style data common to all layer types
+     * \since QGIS 3.0
+     */
+    void readCommonStyle( const QDomElement &layerElement, const QgsReadWriteContext &context );
+
 #ifndef SIP_RUN
 #if 0
     //! Debugging member - invoked when a connect() is made to this object

src/core/qgsvectorlayer.cpp

@@ -1712,6 +1712,9 @@ bool QgsVectorLayer::readSymbology( const QDomNode &layerNode, QString &errorMes
 
   updateFields();
 
+  QDomElement layerElement = layerNode.toElement();
+  readCommonStyle( layerElement, context );
+
   readStyle( layerNode, errorMessage, context );
 
   mDisplayExpression = layerNode.namedItem( QStringLiteral( "previewExpression" ) ).toElement().text();
@@ -2052,8 +2055,12 @@ bool QgsVectorLayer::readStyle( const QDomNode &node, QString &errorMessage, con
   return result;
 }
 
+
 bool QgsVectorLayer::writeSymbology( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context ) const
 {
+  QDomElement layerElement = node.toElement();
+  writeCommonStyle( layerElement, doc, context );
+
   ( void )writeStyle( node, doc, errorMessage, context );
 
   QDomElement fieldConfigurationElement = doc.createElement( QStringLiteral( "fieldConfiguration" ) );

src/core/raster/qgsrasterlayer.cpp

@@ -1294,9 +1294,11 @@ QImage QgsRasterLayer::previewAsImage( QSize size, const QColor &bgColor, QImage
 bool QgsRasterLayer::readSymbology( const QDomNode &layer_node, QString &errorMessage, const QgsReadWriteContext &context )
 {
   Q_UNUSED( errorMessage );
-  Q_UNUSED( context );
   QDomElement rasterRendererElem;
 
+  QDomElement layerElement = layer_node.toElement();
+  readCommonStyle( layerElement, context );
+
   // pipe element was introduced in the end of 1.9 development when there were
   // already many project files in use so we support 1.9 backward compatibility
   // even it was never officially released -> use pipe element if present, otherwise
@@ -1536,7 +1538,9 @@ bool QgsRasterLayer::readXml( const QDomNode &layer_node, const QgsReadWriteCont
 bool QgsRasterLayer::writeSymbology( QDomNode &layer_node, QDomDocument &document, QString &errorMessage, const QgsReadWriteContext &context ) const
 {
   Q_UNUSED( errorMessage );
-  Q_UNUSED( context );
+
+  QDomElement layerElement = layer_node.toElement();
+  writeCommonStyle( layerElement, document, context );
 
   // Store pipe members (except provider) into pipe element, in future, it will be
   // possible to add custom filters into the pipe