Fix #10392 (ellipsoid for measurement keep getting reset)

python/gui/qgsprojectionselector.sip

@@ -102,4 +102,7 @@ class QgsProjectionSelector : QWidget
     void refresh();
     //! Let listeners know if find has focus so they can adjust the default button
     void searchBoxHasFocus( bool );
+    //! Notify others that the widget is now fully initialized, including deferred selection of projection
+    //! @note added in 2.4
+    void initialized();
 };

src/app/qgsprojectproperties.cpp

@@ -74,6 +74,7 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas* mapCanvas, QWidget *pa
   connect( buttonBox->button( QDialogButtonBox::Apply ), SIGNAL( clicked() ), this, SLOT( apply() ) );
   connect( this, SIGNAL( accepted() ), this, SLOT( apply() ) );
   connect( projectionSelector, SIGNAL( sridSelected( QString ) ), this, SLOT( setMapUnitsToCurrentProjection() ) );
+  connect( projectionSelector, SIGNAL( initialized() ), this, SLOT( projectionSelectorInitialized() ) );
 
   connect( cmbEllipsoid, SIGNAL( currentIndexChanged( int ) ), this, SLOT( updateEllipsoidUI( int ) ) );
 
@@ -123,33 +124,10 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas* mapCanvas, QWidget *pa
   cbxAbsolutePath->setCurrentIndex( QgsProject::instance()->readBoolEntry( "Paths", "/Absolute", true ) ? 0 : 1 );
 
   // populate combo box with ellipsoids
-
-  QgsDebugMsg( "Setting upp ellipsoid" );
-
+  // selection of the ellipsoid from settings is defferred to a later point, because it would
+  // be overridden in the meanwhile by the projection selector
   populateEllipsoidList();
 
-  // Reading ellipsoid from setttings
-  QStringList mySplitEllipsoid = QgsProject::instance()->readEntry( "Measure", "/Ellipsoid", GEO_NONE ).split( ':' );
-
-  int myIndex = 0;
-  for ( int i = 0; i < mEllipsoidList.length(); i++ )
-  {
-    if ( mEllipsoidList[ i ].acronym.startsWith( mySplitEllipsoid[ 0 ] ) )
-    {
-      myIndex = i;
-      break;
-    }
-  }
-
-  // Update paramaters if present.
-  if ( mySplitEllipsoid.length() >= 3 )
-  {
-    mEllipsoidList[ myIndex ].semiMajor =  mySplitEllipsoid[ 1 ].toDouble();
-    mEllipsoidList[ myIndex ].semiMinor =  mySplitEllipsoid[ 2 ].toDouble();
-  }
-
-  updateEllipsoidUI( myIndex );
-
 
   int dp = QgsProject::instance()->readNumEntry( "PositionPrecision", "/DecimalPlaces" );
   spinBoxDP->setValue( dp );
@@ -1631,3 +1609,30 @@ void QgsProjectProperties::updateEllipsoidUI( int newIndex )
   }
   cmbEllipsoid->setCurrentIndex( mEllipsoidIndex ); // Not always necessary
 }
+
+void QgsProjectProperties::projectionSelectorInitialized()
+{
+  QgsDebugMsg( "Setting up ellipsoid" );
+
+  // Reading ellipsoid from setttings
+  QStringList mySplitEllipsoid = QgsProject::instance()->readEntry( "Measure", "/Ellipsoid", GEO_NONE ).split( ':' );
+
+  int myIndex = 0;
+  for ( int i = 0; i < mEllipsoidList.length(); i++ )
+  {
+    if ( mEllipsoidList[ i ].acronym.startsWith( mySplitEllipsoid[ 0 ] ) )
+    {
+      myIndex = i;
+      break;
+    }
+  }
+
+  // Update paramaters if present.
+  if ( mySplitEllipsoid.length() >= 3 )
+  {
+    mEllipsoidList[ myIndex ].semiMajor =  mySplitEllipsoid[ 1 ].toDouble();
+    mEllipsoidList[ myIndex ].semiMinor =  mySplitEllipsoid[ 2 ].toDouble();
+  }
+
+  updateEllipsoidUI( myIndex );
+}

src/app/qgsprojectproperties.h

@@ -163,6 +163,9 @@ class APP_EXPORT QgsProjectProperties : public QgsOptionsDialogBase, private Ui:
      */
     void updateEllipsoidUI( int newIndex );
 
+    //! sets the right ellipsoid for measuring (from settings)
+    void projectionSelectorInitialized();
+
   signals:
     //! Signal used to inform listeners that the mouse display precision may have changed
     void displayPrecisionChanged();

src/gui/qgsprojectionselector.cpp

@@ -171,6 +171,8 @@ void QgsProjectionSelector::showEvent( QShowEvent * theEvent )
   // apply deferred selection
   applySelection();
 
+  emit initialized();
+
   // Pass up the inheritance hierarchy
   QWidget::showEvent( theEvent );
 }

src/gui/qgsprojectionselector.h

@@ -205,6 +205,9 @@ class GUI_EXPORT QgsProjectionSelector : public QWidget, private Ui::QgsProjecti
     void refresh();
     //! Let listeners know if find has focus so they can adjust the default button
     void searchBoxHasFocus( bool );
+    //! Notify others that the widget is now fully initialized, including deferred selection of projection
+    //! @note added in 2.4
+    void initialized();
 };
 
 #endif