If the first layer loaded is a basemap layer zoom to user's country

python/PyQt6/core/auto_additions/qgslocaleutils.py

@@ -0,0 +1,7 @@
+# The following has been generated automatically from src/core/qgslocaleutils.h
+try:
+    QgsLocaleUtils.countryBounds = staticmethod(QgsLocaleUtils.countryBounds)
+    QgsLocaleUtils.territoryBounds = staticmethod(QgsLocaleUtils.territoryBounds)
+    QgsLocaleUtils.systemLocaleGeographicBounds = staticmethod(QgsLocaleUtils.systemLocaleGeographicBounds)
+except (NameError, AttributeError):
+    pass

python/PyQt6/core/auto_generated/qgslocaleutils.sip.in

@@ -0,0 +1,63 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgslocaleutils.h                                            *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.py again   *
+ ************************************************************************/
+
+
+
+class QgsLocaleUtils
+{
+%Docstring(signature="appended")
+Contains locale related utility functions.
+
+.. versionadded:: 4.0
+%End
+
+%TypeHeaderCode
+#include "qgslocaleutils.h"
+%End
+  public:
+
+    static QgsRectangle countryBounds( const QString &country );
+%Docstring
+Returns the approximate bounds of a ``country`` (in EPSG:4326).
+
+Returns an invalid rectangle if the country could not be matched.
+
+.. seealso:: :py:func:`territoryBounds`
+%End
+
+    static QgsRectangle territoryBounds( const QLocale &locale );
+%Docstring
+Returns the approximate bounds of a locale, by territory (in EPSG:4326).
+
+Returns an invalid rectangle if the territory could not be matched.
+
+.. seealso:: :py:func:`countryBounds`
+
+.. seealso:: :py:func:`systemLocaleGeographicBounds`
+%End
+
+    static QgsRectangle systemLocaleGeographicBounds();
+%Docstring
+Returns the approximate bounds of the current system locale (in
+EPSG:4326).
+
+This method retrieves the territory from the system locale, and attempts
+to retrieve the approximate bounds of the matching country.
+
+Returns an invalid rectangle if the system locale territory could not be
+matched.
+%End
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgslocaleutils.h                                            *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.py again   *
+ ************************************************************************/

python/PyQt6/core/core_auto.sip

@@ -94,6 +94,7 @@
 %Include auto_generated/qgslegendsettings.sip
 %Include auto_generated/qgslegendstyle.sip
 %Include auto_generated/qgslocaldefaultsettings.sip
+%Include auto_generated/qgslocaleutils.sip
 %Include auto_generated/qgslocalizeddatapathregistry.sip
 %Include auto_generated/qgslogger.sip
 %Include auto_generated/qgsmapclippingregion.sip

python/core/auto_additions/qgslocaleutils.py

@@ -0,0 +1,7 @@
+# The following has been generated automatically from src/core/qgslocaleutils.h
+try:
+    QgsLocaleUtils.countryBounds = staticmethod(QgsLocaleUtils.countryBounds)
+    QgsLocaleUtils.territoryBounds = staticmethod(QgsLocaleUtils.territoryBounds)
+    QgsLocaleUtils.systemLocaleGeographicBounds = staticmethod(QgsLocaleUtils.systemLocaleGeographicBounds)
+except (NameError, AttributeError):
+    pass

python/core/auto_generated/qgslocaleutils.sip.in

@@ -0,0 +1,63 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgslocaleutils.h                                            *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.py again   *
+ ************************************************************************/
+
+
+
+class QgsLocaleUtils
+{
+%Docstring(signature="appended")
+Contains locale related utility functions.
+
+.. versionadded:: 4.0
+%End
+
+%TypeHeaderCode
+#include "qgslocaleutils.h"
+%End
+  public:
+
+    static QgsRectangle countryBounds( const QString &country );
+%Docstring
+Returns the approximate bounds of a ``country`` (in EPSG:4326).
+
+Returns an invalid rectangle if the country could not be matched.
+
+.. seealso:: :py:func:`territoryBounds`
+%End
+
+    static QgsRectangle territoryBounds( const QLocale &locale );
+%Docstring
+Returns the approximate bounds of a locale, by territory (in EPSG:4326).
+
+Returns an invalid rectangle if the territory could not be matched.
+
+.. seealso:: :py:func:`countryBounds`
+
+.. seealso:: :py:func:`systemLocaleGeographicBounds`
+%End
+
+    static QgsRectangle systemLocaleGeographicBounds();
+%Docstring
+Returns the approximate bounds of the current system locale (in
+EPSG:4326).
+
+This method retrieves the territory from the system locale, and attempts
+to retrieve the approximate bounds of the matching country.
+
+Returns an invalid rectangle if the system locale territory could not be
+matched.
+%End
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgslocaleutils.h                                            *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.py again   *
+ ************************************************************************/

python/core/core_auto.sip

@@ -94,6 +94,7 @@
 %Include auto_generated/qgslegendsettings.sip
 %Include auto_generated/qgslegendstyle.sip
 %Include auto_generated/qgslocaldefaultsettings.sip
+%Include auto_generated/qgslocaleutils.sip
 %Include auto_generated/qgslocalizeddatapathregistry.sip
 %Include auto_generated/qgslogger.sip
 %Include auto_generated/qgsmapclippingregion.sip

src/core/CMakeLists.txt

@@ -556,6 +556,7 @@ set(QGIS_CORE_SRCS
   qgsmessageoutput.cpp
   qgsmimedatautils.cpp
   qgsmultirenderchecker.cpp
+  qgslocaleutils.cpp
   qgsobjectcustomproperties.cpp
   qgsofflineediting.cpp
   qgsogcutils.cpp
@@ -1226,6 +1227,7 @@ set(QGIS_CORE_HDRS
   qgslegendstyle.h
   qgslocaldefaultsettings.h
   qgslocalec.h
+  qgslocaleutils.h
   qgslocalizeddatapathregistry.h
   qgslogger.h
   qgsmapclippingregion.h

src/core/qgslocaleutils.cpp

@@ -0,0 +1,76 @@
+/***************************************************************************
+    qgslocaleutils.cpp
+     -------------
+    Date                 : September 2025
+    Copyright            : (C) 2025 Nyall Dawson
+    Email                : nyall dot dawson at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgslocaleutils.h"
+#include "qgsapplication.h"
+#include "qgsvectorlayer.h"
+#include "qgsreadwritelocker.h"
+#include "qgsfeaturerequest.h"
+#include "qgsexpression.h"
+#include <QReadWriteLock>
+#include <mutex>
+
+QgsRectangle QgsLocaleUtils::countryBounds( const QString &country )
+{
+  static QReadWriteLock sMutex;
+  static QMap< QString, QgsRectangle > sCache;
+  QgsReadWriteLocker locker( sMutex, QgsReadWriteLocker::Read );
+  {
+    auto it = sCache.constFind( country );
+    if ( it != sCache.constEnd() )
+      return it.value();
+  }
+
+  locker.changeMode( QgsReadWriteLocker::Write );
+  const QString fileName = QgsApplication::pkgDataPath() + QStringLiteral( "/resources/data/world_map.gpkg|layername=countries" );
+  QgsVectorLayer::LayerOptions options;
+  options.forceReadOnly = true;
+  auto layer = std::make_unique< QgsVectorLayer >( fileName, QStringLiteral( "World Map" ), QStringLiteral( "ogr" ), options );
+
+  QgsFeatureRequest req = QgsFeatureRequest().setFilterExpression( QgsExpression::createFieldEqualityExpression( QStringLiteral( "Name" ), country ) ).setNoAttributes();
+  QgsFeatureIterator featureIt = layer->getFeatures( req );
+  QgsFeature f;
+  QgsRectangle rect;
+  if ( featureIt.nextFeature( f ) )
+  {
+    rect = f.geometry().boundingBox();
+  }
+
+  sCache.insert( country, rect );
+  return rect;
+}
+
+QgsRectangle QgsLocaleUtils::territoryBounds( const QLocale &locale )
+{
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+  const QString territoryName = QLocale::countryToString( locale.country() );
+#else
+  const QString territoryName = QLocale::territoryToCode( locale.territory() );
+#endif
+
+  return countryBounds( territoryName );
+}
+
+QgsRectangle QgsLocaleUtils::systemLocaleGeographicBounds()
+{
+  static std::once_flag initialized;
+  static QgsRectangle sRes;
+  std::call_once( initialized, []
+  {
+    sRes = territoryBounds( QLocale::system() );
+  } );
+
+  return sRes;
+}

src/core/qgslocaleutils.h

@@ -0,0 +1,62 @@
+/***************************************************************************
+    qgslocaleutils.h
+     -------------
+    Date                 : September 2025
+    Copyright            : (C) 2025 Nyall Dawson
+    Email                : nyall dot dawson at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSLOCALEUTILS_H
+#define QGSLOCALEUTILS_H
+
+#include "qgis_core.h"
+#include "qgsrectangle.h"
+
+/**
+ * \ingroup core
+ * \class QgsLocaleUtils
+ * \brief Contains locale related utility functions.
+ * \since QGIS 4.0
+ */
+class CORE_EXPORT QgsLocaleUtils
+{
+  public:
+
+    /**
+     * Returns the approximate bounds of a \a country (in EPSG:4326).
+     *
+     * Returns an invalid rectangle if the country could not be matched.
+     *
+     * \see territoryBounds()
+     */
+    static QgsRectangle countryBounds( const QString &country );
+
+    /**
+     * Returns the approximate bounds of a locale, by territory (in EPSG:4326).
+     *
+     * Returns an invalid rectangle if the territory could not be matched.
+     *
+     * \see countryBounds()
+     * \see systemLocaleGeographicBounds()
+     */
+    static QgsRectangle territoryBounds( const QLocale &locale );
+
+    /**
+     * Returns the approximate bounds of the current system locale (in EPSG:4326).
+     *
+     * This method retrieves the territory from the system locale, and attempts to
+     * retrieve the approximate bounds of the matching country.
+     *
+     * Returns an invalid rectangle if the system locale territory could not be matched.
+     */
+    static QgsRectangle systemLocaleGeographicBounds();
+};
+
+#endif // QGSLOCALEUTILS_H

src/gui/layertree/qgslayertreemapcanvasbridge.cpp

@@ -25,6 +25,8 @@
 #include "qgsproject.h"
 #include "qgssettings.h"
 #include "qgsgui.h"
+#include "qgslocaleutils.h"
+#include "qgsreferencedgeometry.h"
 
 QgsLayerTreeMapCanvasBridge::QgsLayerTreeMapCanvasBridge( QgsLayerTree *root, QgsMapCanvas *canvas, QObject *parent )
   : QObject( parent )
@@ -74,13 +76,20 @@ void QgsLayerTreeMapCanvasBridge::setCanvasLayers()
   const QList<QgsLayerTreeLayer *> layerNodes = mRoot->findLayers();
   int currentSpatialLayerCount = 0;
   int currentValidSpatialLayerCount = 0;
+  bool allAddedLayersAreBasemaps = true;
   for ( QgsLayerTreeLayer *layerNode : layerNodes )
   {
     if ( layerNode->layer() && layerNode->layer()->isSpatial() )
     {
       currentSpatialLayerCount++;
       if ( layerNode->layer()->isValid() )
+      {
         currentValidSpatialLayerCount++;
+        if ( !layerNode->layer()->properties().testFlag( Qgis::MapLayerProperty::IsBasemapLayer ) )
+        {
+          allAddedLayersAreBasemaps = false;
+        }
+      }
     }
   }
 
@@ -93,8 +102,23 @@ void QgsLayerTreeMapCanvasBridge::setCanvasLayers()
 
   if ( firstValidLayers )
   {
-    // if we are moving from zero to non-zero layers, let's zoom to those data (only consider valid layers here!)
-    mCanvas->zoomToProjectExtent();
+    if ( allAddedLayersAreBasemaps )
+    {
+      const QgsRectangle localeRect = QgsLocaleUtils::systemLocaleGeographicBounds();
+      if ( !localeRect.isNull() )
+      {
+        mCanvas->setReferencedExtent( QgsReferencedRectangle( localeRect, QgsCoordinateReferenceSystem( "EPSG:4326" ) ) );
+      }
+      else
+      {
+        mCanvas->zoomToProjectExtent();
+      }
+    }
+    else
+    {
+      // if we are moving from zero to non-zero layers, let's zoom to those data (only consider valid layers here!)
+      mCanvas->zoomToProjectExtent();
+    }
   }
 
   if ( !mFirstCRS.isValid() )

tests/src/python/CMakeLists.txt

@@ -175,6 +175,7 @@ ADD_PYTHON_TEST(PyQgsLineString test_qgslinestring.py)
 ADD_PYTHON_TEST(PyQgsLineSymbolLayers test_qgslinesymbollayers.py)
 ADD_PYTHON_TEST(PyQgsLineburstSymbolLayer test_qgslineburstsymbollayer.py)
 ADD_PYTHON_TEST(PyQgsLocalDefaultSettings test_qgslocaldefaultsettings.py)
+ADD_PYTHON_TEST(PyQgsLocaleUtils test_qgslocaleutils.py)
 ADD_PYTHON_TEST(PyQgsLocalizedDataPathRegistry test_qgslocalizeddatapathregistry.py)
 ADD_PYTHON_TEST(PyQgsLocator test_qgslocator.py)
 ADD_PYTHON_TEST(PyQgsMapBoxGlStyleConverter test_qgsmapboxglconverter.py)