ENH: better handling of exceptions thrown during DoUpdateParameters()

Modules/Wrappers/QtWidget/include/otbWrapperQtWidgetView.h

@@ -55,6 +55,7 @@ public:
 public slots:
   void CloseSlot();
   void UnhandledException(QString message);
+  void OnExceptionRaised(QString message);
 
 private slots:
   void UpdateMessageAfterExecuteClicked();

Modules/Wrappers/QtWidget/src/otbWrapperQtWidgetModel.cxx

@@ -70,7 +70,42 @@ QtWidgetModel
 ::NotifyUpdate()
 {
   // Update the parameters
-  m_Application->UpdateParameters();
+  try
+  {
+    m_Application->UpdateParameters();
+  }
+  catch(otb::ApplicationException& err)
+  {
+    m_Application->GetLogger()->Debug("Caught otb::ApplicationException during application update:\n");
+    m_Application->GetLogger()->Debug(string(err.what()) + "\n");
+    emit ExceptionRaised( err.what() );
+  }
+  catch(otb::ImageFileReaderException& err)
+  {
+    m_Application->GetLogger()->Debug("Caught otb::ImageFileReaderException during application update:\n");
+    m_Application->GetLogger()->Debug(string(err.what()) + "\n");
+    string message( string("Cannot open image ") + err.m_Filename + string(". ") + err.GetDescription() );
+    m_Application->GetLogger()->Fatal( message + string("\n"));
+    emit ExceptionRaised( message.c_str() );
+  }
+  catch(itk::ExceptionObject& err)
+  {
+    m_Application->GetLogger()->Debug("Caught itk::ExceptionObject during application update:\n");
+    m_Application->GetLogger()->Debug(string(err.what()) + "\n");
+    m_Application->GetLogger()->Fatal(string(err.GetDescription()) + "\n");
+    emit ExceptionRaised( err.GetDescription() );
+  }
+  catch(std::exception& err)
+  {
+    m_Application->GetLogger()->Fatal(string("Caught std::exception during application update: ") + err.what() + "\n");
+    emit ExceptionRaised( err.what() );
+  }
+  catch(...)
+  {
+    m_Application->GetLogger()->Fatal("Caught unknown exception during application update.\n");
+    emit ExceptionRaised("Unknown exception");
+  }
+
   emit UpdateGui();
 
   // Notify all

Modules/Wrappers/QtWidget/src/otbWrapperQtWidgetView.cxx

@@ -82,6 +82,8 @@ void QtWidgetView::CreateGui()
   QVBoxLayout  *finalLayout = new QVBoxLayout();
   finalLayout->addWidget(mainGroup);
 
+  connect( m_Model, SIGNAL(ExceptionRaised(QString)), this, SLOT(OnExceptionRaised(QString)) );
+
   // Make the final layout to the widget
   this->setLayout(finalLayout);
 }
@@ -188,9 +190,14 @@ void QtWidgetView::CloseSlot()
 
 void QtWidgetView::UnhandledException(QString message)
 {
-  m_TabWidget->setCurrentIndex(1);
+  this->OnExceptionRaised(message);
   m_LogText->append(message);
 }
 
+void QtWidgetView::OnExceptionRaised(QString message)
+{
+  m_TabWidget->setCurrentIndex(1);
+}
+
 }
 }