Show datum transform parameters in datum transform selection dialog

src/core/qgscoordinatetransform.h

@@ -213,6 +213,7 @@ class CORE_EXPORT QgsCoordinateTransform : public QObject
 
     /**Returns list of datum transformations for the given src and dest CRS*/
     static QList< QList< int > > datumTransformations( const QgsCoordinateReferenceSystem& srcCRS, const QgsCoordinateReferenceSystem& destCRS );
+    static QString datumTransformString( int datumTransform );
 
     int sourceDatumTransform() const { return mSourceDatumTransform; }
     void setSourceDatumTransform( int dt ) { mSourceDatumTransform = dt; }
@@ -284,7 +285,6 @@ class CORE_EXPORT QgsCoordinateTransform : public QObject
     /**Removes +nadgrids and +towgs84 from proj4 string*/
     static QString stripDatumTransform( const QString& proj4 );
     static void searchDatumTransform( const QString& sql, QList< int >& transforms );
-    static QString datumTransformString( int datumTransform );
 };
 
 //! Output stream operator

src/gui/qgsdatumtransformdialog.cpp

@@ -1,4 +1,5 @@
 #include "qgsdatumtransformdialog.h"
+#include "qgscoordinatetransform.h"
 
 QgsDatumTransformDialog::QgsDatumTransformDialog( const QList< QList< int > >& dt, QWidget* parent, Qt::WindowFlags f ): QDialog( parent, f )
 {
@@ -10,10 +11,11 @@ QgsDatumTransformDialog::QgsDatumTransformDialog( const QList< QList< int > >& d
     QString itemText;
     for ( int i = 0; i < 2; ++i )
     {
-      itemText = QString::number( it->at( i ) );
-      if ( itemText.compare( "-1" ) != 0 )
+      int nr = it->at( i );
+      if ( nr != -1 )
       {
-        item->setText( i, itemText );
+        item->setData( i, Qt::UserRole, nr );
+        item->setText( i, QgsCoordinateTransform::datumTransformString( nr ) );
       }
     }
     mDatumTransformTreeWidget->addTopLevelItem( item );
@@ -37,15 +39,12 @@ QList< int > QgsDatumTransformDialog::selectedDatumTransform()
   {
     for ( int i = 0; i < 2; ++i )
     {
-      bool conversionOk = false;
-      QString itemText = item->text( i );
-      int transformNr = itemText.toInt( &conversionOk );
-      if ( !itemText.isEmpty() && conversionOk )
+      int transformNr = item->data( i, Qt::UserRole ).toInt();
+      if ( transformNr != -1 )
       {
         list << transformNr;
       }
     }
   }
-
   return list;
 }

src/ui/qgsdatumtransformdialogbase.ui

@@ -11,14 +11,19 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>Select datum transformations</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QTreeWidget" name="mDatumTransformTreeWidget">
      <column>
       <property name="text">
-       <string/>
+       <string>src transform</string>
+      </property>
+     </column>
+     <column>
+      <property name="text">
+       <string>dst transform</string>
       </property>
      </column>
      <column>