Add exception handler for all events. This will catch uncaught exceptions thrown by event handlers and display an alert instead of crashing. Improvement, not fix, for #1308 and #1268.

git-svn-id: http://svn.osgeo.org/qgis/trunk@9319 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/core/qgsapplication.cpp

@@ -19,11 +19,10 @@
 #include "qgsproviderregistry.h"
 
 #include <QDir>
+#include <QMessageBox>
 #include <QPalette>
 
-#include <qgsconfig.h>
-
-#include <iostream>
+#include "qgsconfig.h"
 
 // for htonl
 #ifdef WIN32
@@ -68,6 +67,21 @@ QgsApplication::QgsApplication( int & argc, char ** argv, bool GUIenabled )
 QgsApplication::~QgsApplication()
 {}
 
+bool QgsApplication::notify( QObject * receiver, QEvent * event )
+{
+  // Send event to receiver and catch unhandled exceptions
+  bool done = true;
+  try
+  {
+    done = QApplication::notify( receiver, event );
+  }
+  catch ( std::exception & e )
+  {
+    QMessageBox::critical( activeWindow(), tr( "Exception" ), e.what() );
+  }
+  return done;
+}
+
 void QgsApplication::setPrefixPath( const QString thePrefixPath, bool useDefaultPaths )
 {
   mPrefixPath = thePrefixPath;

src/core/qgsapplication.h

@@ -28,6 +28,9 @@ class CORE_EXPORT QgsApplication: public QApplication
     QgsApplication( int & argc, char ** argv, bool GUIenabled );
     virtual ~QgsApplication();
 
+    //! Catch exceptions when sending event to receiver.
+    virtual bool notify( QObject * receiver, QEvent * event );
+
     /** Set the active theme to the specified theme.
      * The theme name should be a single word e.g. 'default','classic'.
      * The theme search path usually will be pkgDataPath + "/themes/" + themName + "/"