layermaptest and fixes

after feedback - mostly doc stuff or code style

python/core/auto_generated/qgsapplication.sip.in

@@ -797,18 +797,6 @@ Do not include generated variables (like system name, user name etc.)
 Set a single custom expression variable.
 
 .. versionadded:: 3.0
-%End
-
-    int maxConcurrentConnectionsPerPool() const;
-%Docstring
-The maximum number of concurrent connections per connections pool.
-
-.. note::
-
-   QGIS may in some situations allocate more than this amount
-   of connections to avoid deadlocks.
-
-.. versionadded:: 3.4
 %End
 
     void collectTranslatableObjects( QgsTranslationContext *translationContext );
@@ -836,6 +824,14 @@ Emitted whenever a custom global variable changes.
     void nullRepresentationChanged();
 %Docstring
 \copydoc nullRepresentation()
+%End
+
+    void requestForTranslatableObjects( QgsTranslationContext *translationContext );
+%Docstring
+Emitted when project strings which require translation are being collected for inclusion in a .ts file.
+In order to register translatable strings, connect to this signal and register the strings within the specified ``translationContext``.
+
+.. versionadded:: 3.4
 %End
 
 };

python/core/auto_generated/qgseditformconfig.sip.in

@@ -252,7 +252,7 @@ Sets type of feature form pop-up suppression after feature creation (overrides a
 %End
 
 
-    void readXml( const QDomNode &node,  QgsReadWriteContext &context );
+    void readXml( const QDomNode &node, QgsReadWriteContext &context );
 %Docstring
 Read XML information
 Deserialize on project load
@@ -264,7 +264,7 @@ Write XML information
 Serialize on project save
 %End
 
-    QgsAttributeEditorElement *attributeEditorElementFromDomElement( QDomElement &elem, QgsAttributeEditorElement *parent, const QString &layerId = QString() );
+    QgsAttributeEditorElement *attributeEditorElementFromDomElement( QDomElement &elem, QgsAttributeEditorElement *parent, const QString &layerId = QString(), const QgsReadWriteContext &context = QgsReadWriteContext() );
 %Docstring
 Deserialize drag and drop designer elements.
 %End

python/core/auto_generated/qgsproject.sip.in

@@ -1027,9 +1027,14 @@ just before a new project is read).
 .. versionadded:: 3.2
 %End
 
-    void readProject( const QDomDocument &, QgsReadWriteContext &context );
+    void readProject( const QDomDocument & );
 %Docstring
 Emitted when a project is being read.
+%End
+
+    void readProjectWithContext( const QDomDocument &, QgsReadWriteContext &context );
+%Docstring
+Emitted when a project is being read. And passing the /a context
 %End
 
     void writeProject( QDomDocument & );
@@ -1369,8 +1374,8 @@ home path will be automatically determined from the project's file path.
 
     void registerTranslatableContainers( QgsTranslationContext *translationContext, QgsAttributeEditorContainer *parent, const QString &layerId );
 %Docstring
-Registers the translatable containers into the translation context
-this is a rekursive function to get all the child containers
+Registers the containers that require translation into the translationContext.
+This is a recursive function to get all the child containers.
 
 :param translationContext: where the objects will be registered
 :param parent: parent-container containing list of children
@@ -1381,10 +1386,8 @@ this is a rekursive function to get all the child containers
 
     void registerTranslatableObjects( QgsTranslationContext *translationContext );
 %Docstring
-Registers the translatable objects into the translation context
-so there can be created a ts file these values
-
-:param translationContext: where the objects will be registered
+Registers the objects that require translation into the ``translationContext``.
+So there can be created a ts file with these values.
 
 .. versionadded:: 3.4
 %End

python/core/auto_generated/qgsprojecttranslator.sip.in

@@ -11,7 +11,7 @@
 class QgsProjectTranslator
 {
 %Docstring
-This abstract class is to call translate() for project data from wherever QgsReadWriteContext is available.
+Wherever an object of this class is available, the derived translate function can be called from.
 
 .. versionadded:: 3.4
 %End
@@ -24,7 +24,15 @@ This abstract class is to call translate() for project data from wherever QgsRea
 
     virtual QString translate( const QString &context, const QString &sourceText, const char *disambiguation = 0, int n = -1 ) const = 0;
 %Docstring
-This method needs to be reimplemented in all classes which implement this interface
+The derived translate() translates with QTranslator and qm file the sourceText.
+It
+:return: the result string and in case there is no QTranslator loaded, the sourceText.
+           This function can be called from wherever the QgsReadWriteContext is available.
+
+:param context: describing layer etc.
+:param sourceText: is the identifier of this text
+:param disambiguation: it's the disambiguation
+:param n: if -1 uses the appropriate form
 
 .. versionadded:: 3.4
 %End

python/core/auto_generated/qgsreadwritecontext.sip.in

@@ -107,7 +107,8 @@ Returns the project translator
 
     void setProjectTranslator( QgsProjectTranslator *projectTranslator );
 %Docstring
-Sets the project translator
+Sets the project translator. Means it shouldn't conform mDefaultTranslator anymore.
+It's usually the QgsProject where the function with the context is made and won't be changed anymore.
 
 .. versionadded:: 3.4
 %End

python/core/auto_generated/qgstranslationcontext.sip.in

@@ -12,7 +12,7 @@
 class QgsTranslationContext
 {
 %Docstring
-used for the collecting of strings of .qgs to be translated and writing of ts file
+Used for the collecting of strings from projects for translation and creation of ts files.
 
 .. versionadded:: 3.4
 %End
@@ -22,7 +22,7 @@ used for the collecting of strings of .qgs to be translated and writing of ts fi
 %End
   public:
 
-    QgsTranslationContext( );
+    QgsTranslationContext();
 %Docstring
 Constructor
 %End
@@ -36,7 +36,7 @@ Returns the project
 
     void setProject( QgsProject *project );
 %Docstring
-Sets the ``project`` where the translation need to be done for
+Sets the ``project`` being translated.
 
 .. seealso:: :py:func:`project`
 %End
@@ -50,17 +50,15 @@ Returns the TS fileName
 
     void setFileName( const QString &fileName );
 %Docstring
-Sets the ``name`` of the TS file
+Sets the ``fileName`` of the TS file
 
 .. seealso:: :py:func:`fileName`
 %End
 
     void registerTranslation( const QString &context, const QString &source );
 %Docstring
-Registers the ``string`` to be translated
-
-:param context: layer name and sub category of object needed to be translated
-:param source: the name of the object needed to be translated
+Registers the ``source`` to be translated. It's the text of the object needed to be translated.
+The ``context`` defines in what context the object is used. Means layer name and sub category of object needed to be translated.
 %End
 
     void writeTsFile( const QString &locale );

src/core/layertree/qgslayertreenode.cpp

@@ -65,7 +65,7 @@ QgsLayerTreeNode *QgsLayerTreeNode::readXml( QDomElement &element, const QgsProj
   if ( project )
     resolver = project->pathResolver();
   context.setPathResolver( resolver );
-  context.setProjectTranslator( ( QgsProject * )project );
+  context.setProjectTranslator( const_cast<QgsProject *>( project ) );
 
   QgsLayerTreeNode *node = readXml( element, context );
   if ( node )

src/core/layout/qgscompositionconverter.cpp

@@ -1193,7 +1193,7 @@ bool QgsCompositionConverter::readLegendXml( QgsLayoutItemLegend *layoutItem, co
     pathResolver = project->pathResolver();
   QgsReadWriteContext context;
   context.setPathResolver( pathResolver );
-  context.setProjectTranslator( ( QgsProject * )project );
+  context.setProjectTranslator( const_cast<QgsProject *>( project ) );
 
   //composer map: use uuid
   QString mapId = itemElem.attribute( QStringLiteral( "map" ), QStringLiteral( "-1" ) );

src/core/qgsapplication.h

@@ -734,16 +734,6 @@ class CORE_EXPORT QgsApplication : public QApplication
     static void setCustomVariable( const QString &name, const QVariant &value );
 
     /**
-     * The maximum number of concurrent connections per connections pool.
-     *
-     * \note QGIS may in some situations allocate more than this amount
-     *       of connections to avoid deadlocks.
-     *
-     * \since QGIS 3.4
-     */
-    int maxConcurrentConnectionsPerPool() const;
-
-   /**
      * Emits the signal to collect all the strings of .qgs to be included in ts file
      *
      * \since QGIS 3.4
@@ -774,9 +764,10 @@ class CORE_EXPORT QgsApplication : public QApplication
     void nullRepresentationChanged();
 
     /**
-     * dave : to write
+     * Emitted when project strings which require translation are being collected for inclusion in a .ts file.
+     * In order to register translatable strings, connect to this signal and register the strings within the specified \a translationContext.
      *
-     * \since QGIS 3.2
+     * \since QGIS 3.4
      */
     void requestForTranslatableObjects( QgsTranslationContext *translationContext );
 

src/core/qgseditformconfig.cpp

@@ -399,7 +399,7 @@ void QgsEditFormConfig::readXml( const QDomNode &node, QgsReadWriteContext &cont
       {
         QDomElement elem = attributeEditorFormNodeList.at( i ).toElement();
 
-        QgsAttributeEditorElement *attributeEditorWidget = attributeEditorElementFromDomElement( elem, nullptr, node.namedItem( QStringLiteral( "id" ) ).toElement().text() );
+        QgsAttributeEditorElement *attributeEditorWidget = attributeEditorElementFromDomElement( elem, nullptr, node.namedItem( QStringLiteral( "id" ) ).toElement().text(), context );
         addTab( attributeEditorWidget );
       }
 
@@ -518,13 +518,13 @@ void QgsEditFormConfig::writeXml( QDomNode &node, const QgsReadWriteContext &con
   //// END TODO
 }
 
-QgsAttributeEditorElement *QgsEditFormConfig::attributeEditorElementFromDomElement( QDomElement &elem, QgsAttributeEditorElement *parent, const QString &layerId )
+QgsAttributeEditorElement *QgsEditFormConfig::attributeEditorElementFromDomElement( QDomElement &elem, QgsAttributeEditorElement *parent, const QString &layerId, const QgsReadWriteContext &context )
 {
   QgsAttributeEditorElement *newElement = nullptr;
 
   if ( elem.tagName() == QLatin1String( "attributeEditorContainer" ) )
   {
-    QgsAttributeEditorContainer *container = new QgsAttributeEditorContainer( QgsProject::instance()->translate( QStringLiteral( "project:layers:%1:formcontainers" ).arg( layerId ), elem.attribute( QStringLiteral( "name" ) ) ), parent );
+    QgsAttributeEditorContainer *container = new QgsAttributeEditorContainer( context.projectTranslator()->translate( QStringLiteral( "project:layers:%1:formcontainers" ).arg( layerId ), elem.attribute( QStringLiteral( "name" ) ) ), parent );
     bool ok;
     int cc = elem.attribute( QStringLiteral( "columnCount" ) ).toInt( &ok );
     if ( !ok )
@@ -551,7 +551,7 @@ QgsAttributeEditorElement *QgsEditFormConfig::attributeEditorElementFromDomEleme
     for ( int i = 0; i < childNodeList.size(); i++ )
     {
       QDomElement childElem = childNodeList.at( i ).toElement();
-      QgsAttributeEditorElement *myElem = attributeEditorElementFromDomElement( childElem, container, layerId );
+      QgsAttributeEditorElement *myElem = attributeEditorElementFromDomElement( childElem, container, layerId, context );
       if ( myElem )
         container->addChildElement( myElem );
     }

src/core/qgseditformconfig.h

@@ -277,7 +277,7 @@ class CORE_EXPORT QgsEditFormConfig
      * Read XML information
      * Deserialize on project load
      */
-    void readXml( const QDomNode &node,  QgsReadWriteContext &context );
+    void readXml( const QDomNode &node, QgsReadWriteContext &context );
 
     /**
      * Write XML information
@@ -288,7 +288,7 @@ class CORE_EXPORT QgsEditFormConfig
     /**
      * Deserialize drag and drop designer elements.
      */
-    QgsAttributeEditorElement *attributeEditorElementFromDomElement( QDomElement &elem, QgsAttributeEditorElement *parent, const QString &layerId = QString() );
+    QgsAttributeEditorElement *attributeEditorElementFromDomElement( QDomElement &elem, QgsAttributeEditorElement *parent, const QString &layerId = QString(), const QgsReadWriteContext &context = QgsReadWriteContext() );
 
     /**
      * Create a new edit form config. Normally invoked by QgsVectorLayer

src/core/qgslayerdefinition.cpp

@@ -299,7 +299,7 @@ QList<QgsMapLayer *> QgsLayerDefinition::loadLayerDefinitionLayers( const QStrin
 
   QgsReadWriteContext context;
   context.setPathResolver( QgsPathResolver( qlrfile ) );
-  //no projecttranslator defined here
+  //no project translator defined here
   return QgsLayerDefinition::loadLayerDefinitionLayers( doc, context );
 }
 

src/core/qgsproject.cpp

@@ -454,7 +454,7 @@ void QgsProject::registerTranslatableContainers( QgsTranslationContext *translat
 
       translationContext->registerTranslation( QStringLiteral( "project:layers:%1:formcontainers" ).arg( layerId ), container->name() );
 
-      if ( container->children().size() > 0 )
+      if ( !container->children().empty() )
         registerTranslatableContainers( translationContext, container, layerId );
     }
   }
@@ -1010,7 +1010,7 @@ bool QgsProject::readProjectFile( const QString &filename )
 
   QgsSettings settings;
 
-  QString localeFileName = QStringLiteral( "%1_%2" ).arg( QFileInfo( projectFile.fileName() ).baseName(), settings.value( QStringLiteral( "locale/userLocale" ), "" ).toString() );
+  QString localeFileName = QStringLiteral( "%1_%2" ).arg( QFileInfo( projectFile.fileName() ).baseName(), settings.value( QStringLiteral( "locale/userLocale" ), QString() ).toString() );
 
   if ( QFile( QStringLiteral( "%1/%2.qm" ).arg( QFileInfo( projectFile.fileName() ).absolutePath(), localeFileName ) ).exists() )
   {
@@ -1306,7 +1306,8 @@ bool QgsProject::readProjectFile( const QString &filename )
   emit ellipsoidChanged( ellipsoid() );
 
   // read the project: used by map canvas and legend
-  emit readProject( *doc, context );
+  emit readProject( *doc );
+  emit readProjectWithContext( *doc, context );
   emit snappingConfigChanged( mSnappingConfig );
 
   // if all went well, we're allegedly in pristine state

src/core/qgsproject.h

@@ -998,7 +998,12 @@ class CORE_EXPORT QgsProject : public QObject, public QgsExpressionContextGenera
     /**
      * Emitted when a project is being read.
      */
-    void readProject( const QDomDocument &, QgsReadWriteContext &context );
+    void readProject( const QDomDocument & );
+
+    /**
+     * Emitted when a project is being read. And passing the /a context
+     */
+    void readProjectWithContext( const QDomDocument &, QgsReadWriteContext &context );
 
     /**
      * Emitted when the project is being written.
@@ -1299,8 +1304,8 @@ class CORE_EXPORT QgsProject : public QObject, public QgsExpressionContextGenera
     void setPresetHomePath( const QString &path );
 
     /**
-     * Registers the translatable containers into the translation context
-     * this is a rekursive function to get all the child containers
+     * Registers the containers that require translation into the translationContext.
+     * This is a recursive function to get all the child containers.
      *
      * \param translationContext where the objects will be registered
      * \param parent parent-container containing list of children
@@ -1310,10 +1315,9 @@ class CORE_EXPORT QgsProject : public QObject, public QgsExpressionContextGenera
     void registerTranslatableContainers( QgsTranslationContext *translationContext, QgsAttributeEditorContainer *parent, const QString &layerId );
 
     /**
-     * Registers the translatable objects into the translation context
-     * so there can be created a ts file these values
+     * Registers the objects that require translation into the \a translationContext.
+     * So there can be created a ts file with these values.
      *
-     * \param translationContext where the objects will be registered
      * \since QGIS 3.4
     */
     void registerTranslatableObjects( QgsTranslationContext *translationContext );

src/core/qgsprojecttranslator.h

@@ -23,7 +23,7 @@
 
 /**
  * \ingroup core
- * This abstract class is to call translate() for project data from wherever QgsReadWriteContext is available.
+ * Wherever an object of this class is available, the derived translate function can be called from.
  *
  * \since QGIS 3.4
  */
@@ -33,7 +33,14 @@ class CORE_EXPORT QgsProjectTranslator
   public:
 
     /**
-     * This method needs to be reimplemented in all classes which implement this interface
+     * The derived translate() translates with QTranslator and qm file the sourceText.
+     * It \returns the result string and in case there is no QTranslator loaded, the sourceText.
+     * This function can be called from wherever the QgsReadWriteContext is available.
+     *
+     * \param context describing layer etc.
+     * \param sourceText is the identifier of this text
+     * \param disambiguation it's the disambiguation
+     * \param n if -1 uses the appropriate form
      *
      * \since QGIS 3.4
      */

src/core/qgsreadwritecontext.h

@@ -107,7 +107,9 @@ class CORE_EXPORT QgsReadWriteContext
     const QgsProjectTranslator *projectTranslator( ) const { return mProjectTranslator; }
 
     /**
-     * Sets the project translator
+     * Sets the project translator. Means it shouldn't conform mDefaultTranslator anymore.
+     * It's usually the QgsProject where the function with the context is made and won't be changed anymore.
+     *
      * \since QGIS 3.4
      */
     void setProjectTranslator( QgsProjectTranslator *projectTranslator );
@@ -127,7 +129,7 @@ class CORE_EXPORT QgsReadWriteContext
     QgsPathResolver mPathResolver;
     QList<ReadWriteMessage> mMessages;
     QStringList mCategories = QStringList();
-    QgsProjectTranslator *mProjectTranslator;
+    QgsProjectTranslator *mProjectTranslator = nullptr;
     friend class QgsReadWriteContextCategoryPopper;
     DefaultTranslator mDefaultTranslator;
 };