change map unit in project dialog when user selects a new crs

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@13619 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/app/qgsprojectproperties.cpp

@@ -49,6 +49,7 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas* mapCanvas, QWidget *pa
   connect( buttonBox, SIGNAL( rejected() ), this, SLOT( reject() ) );
   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() ) );
 
   ///////////////////////////////////////////////////////////
   // Properties stored in map canvas's QgsMapRenderer
@@ -531,6 +532,34 @@ void QgsProjectProperties::on_cbxProjectionEnabled_stateChanged( int state )
   btnGrpMapUnits->setEnabled( state == Qt::Unchecked );
 }
 
+void QgsProjectProperties::setMapUnitsToCurrentProjection()
+{
+  long myCRSID = projectionSelector->selectedCrsId();
+  if ( myCRSID )
+  {
+    QgsCoordinateReferenceSystem srs( myCRSID, QgsCoordinateReferenceSystem::InternalCrsId );
+    //set radio button to crs map unit type
+    QGis::UnitType units = srs.mapUnits();
+    switch ( units )
+    {
+      case QGis::Meters:
+        radMeters->setChecked( true );
+        break;
+      case QGis::Feet:
+        radFeet->setChecked( true );
+        break;
+      case QGis::Degrees:
+        radDecimalDegrees->setChecked( true );
+        break;
+      case QGis::DegreesMinutesSeconds:
+        radDMS->setChecked( true );
+        break;
+      default:
+        break;
+    }
+  }
+}
+
 /*!
  * Function to save dialog window state
  */

src/app/qgsprojectproperties.h

@@ -102,6 +102,11 @@ class QgsProjectProperties : public QDialog, private Ui::QgsProjectPropertiesBas
 
     void on_cbxProjectionEnabled_stateChanged( int state );
 
+    /*!
+      * If user changes the CRS, set the corresponding map units
+      */
+    void setMapUnitsToCurrentProjection();
+
   signals:
     //! Signal used to inform listeners that the mouse display precision may have changed
     void displayPrecisionChanged();