sip files and some improvements

like make a list copy before go through for loop and log messages

python/core/auto_generated/qgsapplication.sip.in

@@ -808,6 +808,13 @@ The maximum number of concurrent connections per connections pool.
    QGIS may in some situations allocate more than this amount
    of connections to avoid deadlocks.
 
+.. versionadded:: 3.4
+%End
+
+    void collectTranslatableObjects( QgsTranslationContext *translationContext );
+%Docstring
+Emits the signal to collect all the strings of .qgs to be included in ts file
+
 .. versionadded:: 3.4
 %End
 

python/core/auto_generated/qgsproject.sip.in

@@ -13,7 +13,7 @@
 
 
 
-class QgsProject : QObject, QgsExpressionContextGenerator
+class QgsProject : QObject, QgsExpressionContextGenerator, QgsProjectTranslator
 {
 %Docstring
 Reads and writes project states.
@@ -135,6 +135,14 @@ Returns last modified time of the project file as returned by the file system (o
 Returns full absolute path to the project file if the project is stored in a file system - derived from fileName().
 Returns empty string when the project is stored in a project storage (there is no concept of paths for custom project storages).
 
+.. versionadded:: 3.2
+%End
+
+    QString absolutePath() const;
+%Docstring
+Returns full absolute path to the project folder if the project is stored in a file system - derived from fileName().
+Returns empty string when the project is stored in a project storage (there is no concept of paths for custom project storages).
+
 .. versionadded:: 3.2
 %End
 
@@ -983,6 +991,28 @@ and it is mainly a hint for the user interface to protect users from removing la
 in the project. The removeMapLayer(), removeMapLayers() calls do not block removal of layers listed here.
 
 .. versionadded:: 3.2
+%End
+
+    void generateTsFile( const QString &locale );
+%Docstring
+Triggers the collection strings of .qgs to be included in ts file and calls writeTsFile()
+
+.. versionadded:: 3.4
+%End
+
+    virtual QString translate( const QString &context, const QString &sourceText, const char *disambiguation = 0, int n = -1 ) const;
+
+%Docstring
+Translates the project with QTranslator and qm file
+
+:return: the result string (in case there is no QTranslator loaded the sourceText)
+
+: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
 
   signals:
@@ -997,7 +1027,7 @@ just before a new project is read).
 .. versionadded:: 3.2
 %End
 
-    void readProject( const QDomDocument & );
+    void readProject( const QDomDocument &, QgsReadWriteContext &context );
 %Docstring
 Emitted when a project is being read.
 %End
@@ -1335,6 +1365,27 @@ home path will be automatically determined from the project's file path.
 .. seealso:: :py:func:`homePathChanged`
 
 .. versionadded:: 3.2
+%End
+
+    void registerTranslatableContainers( QgsTranslationContext *translationContext, QgsAttributeEditorContainer *parent, const QString &layerId );
+%Docstring
+Registers the translatable containers into the tranlation context
+this is a rekursive function to get all the child containers
+
+:param translationContext: where the objects will be registered
+:param parent: parent-container containing list of children
+
+.. versionadded:: 3.4
+%End
+
+    void registerTranslatableObjects( QgsTranslationContext *translationContext );
+%Docstring
+Registers the translatable objects into the tranlation context
+so there can be created a ts file these values
+
+:param translationContext: where the objects will be registered
+
+.. versionadded:: 3.4
 %End
 
 };

python/core/auto_generated/qgsprojecttranslator.sip.in

@@ -0,0 +1,41 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgsprojecttranslator.h                                      *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
+
+
+
+class QgsProjectTranslator
+{
+%Docstring
+This abstract class is to call translate() for project data from wherever QgsReadWriteContext is available.
+
+.. versionadded:: 3.4
+%End
+
+%TypeHeaderCode
+#include "qgsprojecttranslator.h"
+%End
+  public:
+
+
+    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
+
+.. versionadded:: 3.4
+%End
+
+    virtual ~QgsProjectTranslator();
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgsprojecttranslator.h                                      *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/

python/core/auto_generated/qgsreadwritecontext.sip.in

@@ -98,7 +98,21 @@ Returns the stored messages and remove them
 .. versionadded:: 3.2
 %End
 
+    const QgsProjectTranslator *projectTranslator( ) const;
+%Docstring
+Returns the project translator
 
+.. versionadded:: 3.4
+%End
+
+    void setProjectTranslator( QgsProjectTranslator *projectTranslator );
+%Docstring
+Sets the project translator
+
+.. versionadded:: 3.4
+%End
+
+      public:
 };
 
 

python/core/auto_generated/qgsrelation.sip.in

@@ -35,11 +35,12 @@ class QgsRelation
 Default constructor. Creates an invalid relation.
 %End
 
-    static QgsRelation createFromXml( const QDomNode &node );
+    static QgsRelation createFromXml( const QDomNode &node, QgsReadWriteContext &context );
 %Docstring
 Creates a relation from an XML structure. Used for reading .qgs projects.
 
 :param node: The dom node containing the relation information
+:param context: to pass project translator
 
 :return: A relation
 %End

python/core/auto_generated/qgstranslationcontext.sip.in

@@ -0,0 +1,79 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgstranslationcontext.h                                     *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
+
+
+
+
+class QgsTranslationContext
+{
+%Docstring
+used for the collecting of strings of .qgs to be translated and writing of ts file
+
+.. versionadded:: 3.4
+%End
+
+%TypeHeaderCode
+#include "qgstranslationcontext.h"
+%End
+  public:
+
+    QgsTranslationContext( );
+%Docstring
+Constructor
+%End
+
+    QgsProject *project() const;
+%Docstring
+Returns the project
+
+.. seealso:: :py:func:`setProject`
+%End
+
+    void setProject( QgsProject *project );
+%Docstring
+Sets the ``project`` where the translation need to be done for
+
+.. seealso:: :py:func:`project`
+%End
+
+    QString fileName() const;
+%Docstring
+Returns the TS fileName
+
+.. seealso:: :py:func:`setFileName`
+%End
+
+    void setFileName( const QString &fileName );
+%Docstring
+Sets the ``name`` 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 translationString: name and path of the object need to be translated
+:param layerName: the name of the layer
+%End
+
+    void writeTsFile( const QString &locale );
+%Docstring
+Writes the Ts-file
+%End
+
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgstranslationcontext.h                                     *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/

src/app/qgsprojectproperties.cpp

@@ -830,7 +830,6 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas *mapCanvas, QWidget *pa
   connect( mMetadataWidget, &QgsMetadataWidget::titleChanged, titleEdit, &QLineEdit::setText );
   connect( titleEdit, &QLineEdit::textChanged, mMetadataWidget, &QgsMetadataWidget::setTitle );
 
-  //fill ts language checkbox
   //fill ts language checkbox
   QString i18nPath = QgsApplication::i18nPath();
   QDir i18Dir( i18nPath, QStringLiteral( "qgis*.qm" ) );
@@ -845,10 +844,10 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas *mapCanvas, QWidget *pa
 
     // QTBUG-57802: eo locale is improperly handled
     QString displayName = l.startsWith( QLatin1String( "eo" ) ) ? QLocale::languageToString( QLocale::Esperanto ) : QLocale( l ).nativeLanguageName();
-    cbtsLocale->addItem( QIcon( QString( ":/images/flags/%1.svg" ).arg( l ) ), displayName, l );
+    cbtsLocale->addItem( QIcon( QStringLiteral( ":/images/flags/%1.svg" ).arg( l ) ), displayName, l );
   }
 
-  cbtsLocale->addItem( QIcon( QString( ":/images/flags/%1.svg" ).arg( QStringLiteral( "en_US" ) ) ), QLocale( QStringLiteral( "en_US" ) ).nativeLanguageName(), QStringLiteral( "en_US" ) );
+  cbtsLocale->addItem( QIcon( QStringLiteral( ":/images/flags/%1.svg" ).arg( QStringLiteral( "en_US" ) ) ), QLocale( QStringLiteral( "en_US" ) ).nativeLanguageName(), QStringLiteral( "en_US" ) );
   cbtsLocale->setCurrentIndex( cbtsLocale->findData( settings.value( QStringLiteral( "locale/userLocale" ), QString() ).toString() ) );
 
   connect( generateTsFileButton, &QPushButton::clicked, this, &QgsProjectProperties::onGenerateTsFileButton );
@@ -2214,7 +2213,7 @@ void QgsProjectProperties::setCurrentPage( const QString &pageWidgetName )
   }
 }
 
-void QgsProjectProperties::onGenerateTsFileButton()
+void QgsProjectProperties::onGenerateTsFileButton() const
 {
   QString l = cbtsLocale->currentData().toString();
   QgsProject::instance()->generateTsFile( l );

src/app/qgsprojectproperties.h

@@ -93,7 +93,7 @@ class APP_EXPORT QgsProjectProperties : public QgsOptionsDialogBase, private Ui:
     void scaleItemChanged( QListWidgetItem *changedScaleItem );
 
     //! generate the ts file with the locale selected in the checkbox
-    void onGenerateTsFileButton();
+    void onGenerateTsFileButton() const;
 
     /**
      * Set WMS default extent to current canvas extent

src/core/qgsapplication.h

@@ -746,7 +746,7 @@ class CORE_EXPORT QgsApplication : public QApplication
    /**
      * Emits the signal to collect all the strings of .qgs to be included in ts file
      *
-     * \since QGIS 3.2
+     * \since QGIS 3.4
      */
     void collectTranslatableObjects( QgsTranslationContext *translationContext );
 

src/core/qgsproject.cpp

@@ -444,7 +444,7 @@ void QgsProject::setPresetHomePath( const QString &path )
 
 void QgsProject::registerTranslatableContainers( QgsTranslationContext *translationContext, QgsAttributeEditorContainer *parent, const QString &layerId )
 {
-  QList<QgsAttributeEditorElement *> elements = parent->children();
+  const QList<QgsAttributeEditorElement *> elements = parent->children();
 
   for ( QgsAttributeEditorElement *element : elements )
   {
@@ -463,7 +463,9 @@ void QgsProject::registerTranslatableContainers( QgsTranslationContext *translat
 void QgsProject::registerTranslatableObjects( QgsTranslationContext *translationContext )
 {
   //register layers
-  for ( QgsLayerTreeLayer *layer : mRootGroup->findLayers() )
+  const QList<QgsLayerTreeLayer *> layers = mRootGroup->findLayers();
+
+  for ( const QgsLayerTreeLayer *layer : layers )
   {
     translationContext->registerTranslation( QStringLiteral( "project:layers:%1" ).arg( layer->layerId() ), layer->name() );
 
@@ -489,7 +491,8 @@ void QgsProject::registerTranslatableObjects( QgsTranslationContext *translation
   }
 
   //register layergroups
-  for ( const QgsLayerTreeGroup *groupLayer : mRootGroup->findGroups() )
+  const QList<QgsLayerTreeGroup *> groupLayers = mRootGroup->findGroups();
+  for ( const QgsLayerTreeGroup *groupLayer : groupLayers )
   {
     translationContext->registerTranslation( QStringLiteral( "project:layergroups" ), groupLayer->name() );
   }
@@ -1012,10 +1015,7 @@ bool QgsProject::readProjectFile( const QString &filename )
   if ( QFile( QStringLiteral( "%1/%2.qm" ).arg( QFileInfo( projectFile.fileName() ).absolutePath(), localeFileName ) ).exists() )
   {
     mTranslator.reset( new QTranslator() );
-    if ( mTranslator->load( localeFileName, QFileInfo( projectFile.fileName() ).absolutePath() ) )
+    mTranslator->load( localeFileName, QFileInfo( projectFile.fileName() ).absolutePath() );
-    {
-      QgsDebugMsg( "Translation loaded" );
-    }
   }
 
   std::unique_ptr<QDomDocument> doc( new QDomDocument( QStringLiteral( "qgis" ) ) );
@@ -1319,17 +1319,16 @@ bool QgsProject::readProjectFile( const QString &filename )
   {
     //project possibly translated -> rename it with locale postfix
     QString newFileName( QStringLiteral( "%1/%2.qgs" ).arg( QFileInfo( projectFile.fileName() ).absolutePath(), localeFileName ) );
-    QgsProject::instance()->setFileName( newFileName );
+    setFileName( newFileName );
 
-    if ( QgsProject::instance()->write() )
+    if ( write() )
     {
-      QgsProject::instance()->setTitle( localeFileName );
+      setTitle( localeFileName );
-
+      QgsMessageLog::logMessage( tr( "Translated project saved with locale prefix %1" ).arg( newFileName ), QObject::tr( "Project translation" ), Qgis::Success );
-      QgsDebugMsg( "Translated project saved with locale prefix " + newFileName );
     }
     else
     {
-      QgsDebugMsg( "Error saving translated project with locale prefix " + newFileName );
+      QgsMessageLog::logMessage( tr( "Error saving translated project with locale prefix %1" ).arg( newFileName ), QObject::tr( "Project translation" ), Qgis::Critical );
     }
   }
   return true;