src/app/qgscustomprojectiondialog.cpp

@@ -24,6 +24,7 @@
 #include "qgsapplication.h"
 #include "qgslogger.h"
 #include "qgsgenericprojectionselector.h"
+#include "qgscrscache.h"
 
 //qt includes
 #include <QFileInfo>
@@ -291,6 +292,8 @@ bool QgsCustomProjectionDialog::saveCRS( QgsCoordinateReferenceSystem myCRS, QSt
   existingCRSparameters[myId] = myCRS.toProj4();
   existingCRSnames[myId] = myName;
 
+  QgsCRSCache::instance()->updateCRSCache( QString( "USER:%1" ).arg( myId ) );
+
   // If we have a projection acronym not in the user db previously, add it.
   // This is a must, or else we can't select it from the vw_srs table.
   // Actually, add it always and let the SQL PRIMARY KEY remove duplicates.

src/core/qgscrscache.cpp

@@ -57,6 +57,28 @@ const QgsCoordinateTransform* QgsCoordinateTransformCache::transform( const QStr
   }
 }
 
+void QgsCoordinateTransformCache::invalidateCrs( const QString& crsAuthId )
+{
+  //get keys to remove first
+  QHash< QPair< QString, QString >, QgsCoordinateTransform* >::const_iterator it = mTransforms.constBegin();
+  QList< QPair< QString, QString > > updateList;
+
+  for ( ; it != mTransforms.constEnd(); ++it )
+  {
+    if ( it.key().first == crsAuthId || it.key().second == crsAuthId )
+    {
+      updateList.append( it.key() );
+    }
+  }
+
+  //and remove after
+  QList< QPair< QString, QString > >::const_iterator updateIt = updateList.constBegin();
+  for ( ; updateIt != updateList.constEnd(); ++updateIt )
+  {
+    mTransforms.remove( *updateIt );
+  }
+}
+
 QgsCRSCache* QgsCRSCache::mInstance = 0;
 
 QgsCRSCache* QgsCRSCache::instance()
@@ -77,6 +99,16 @@ QgsCRSCache::~QgsCRSCache()
   delete mInstance;
 }
 
+void QgsCRSCache::updateCRSCache( const QString& authid )
+{
+  QgsCoordinateReferenceSystem s;
+  if ( s.createFromOgcWmsCrs( authid ) )
+  {
+    mCRS.insert( authid, s );
+  }
+  QgsCoordinateTransformCache::instance()->invalidateCrs( authid );
+}
+
 const QgsCoordinateReferenceSystem& QgsCRSCache::crsByAuthId( const QString& authid )
 {
   QHash< QString, QgsCoordinateReferenceSystem >::const_iterator crsIt = mCRS.find( authid );

src/core/qgscrscache.h

@@ -34,6 +34,8 @@ class CORE_EXPORT QgsCoordinateTransformCache
         @param srcAuthId auth id string of source crs
         @param destAuthId auth id string of dest crs*/
     const QgsCoordinateTransform* transform( const QString& srcAuthId, const QString& destAuthId );
+    /**Removes transformations where a changed crs is involved from the cache*/
+    void invalidateCrs( const QString& crsAuthId );
 
   private:
     static QgsCoordinateTransformCache* mInstance;
@@ -49,6 +51,8 @@ class CORE_EXPORT QgsCRSCache
     const QgsCoordinateReferenceSystem& crsByAuthId( const QString& authid );
     const QgsCoordinateReferenceSystem& crsByEpsgId( long epsg );
 
+    void updateCRSCache( const QString &authid );
+
   protected:
     QgsCRSCache();