ENH: add Role for Float, int and string parameter

Code/Wrappers/QtWidget/otbWrapperQtWidgetFloatParameter.cxx

@@ -55,6 +55,7 @@ void QtWidgetFloatParameter::DoUpdateGUI()
     {
     font.setBold(false);
     }
+
   m_QDoubleSpinBox->setFont(font);
 }
 
@@ -78,6 +79,11 @@ void QtWidgetFloatParameter::DoCreateWidget()
   m_QHBoxLayout->addStretch();
 
   this->setLayout(m_QHBoxLayout);
+
+  if (m_FloatParam->GetRole() == Role_Output)
+    {
+    m_QDoubleSpinBox->setEnabled( false );
+    }
 }
 
 void QtWidgetFloatParameter::SetValue(double value)

Code/Wrappers/QtWidget/otbWrapperQtWidgetIntParameter.cxx

@@ -51,6 +51,11 @@ void QtWidgetIntParameter::DoCreateWidget()
   m_QHBoxLayout->addStretch();
 
   this->setLayout(m_QHBoxLayout);
+
+  if (m_IntParam->GetRole() == Role_Output)
+    {
+    m_QSpinBox->setEnabled( false );
+    }
 }
 
 void QtWidgetIntParameter::DoUpdateGUI()

Code/Wrappers/QtWidget/otbWrapperQtWidgetModel.cxx

@@ -55,7 +55,9 @@ void QtWidgetModel::ExecuteAndWriteOutputSlot()
 
   // launch the output image writing
   AppliThread * taskAppli = new AppliThread( m_Application );
+  connect(taskAppli, SIGNAL(ApplicationExecutionDone()), this, SLOT(NotifyUpdate()));
   connect(taskAppli, SIGNAL(ApplicationExecutionDone()), this, SLOT(ActivateExecuteButton()));
+
   taskAppli->Execute();
 
   // Tell the Progress Reporter to begin

Code/Wrappers/QtWidget/otbWrapperQtWidgetStringParameter.cxx

@@ -54,6 +54,11 @@ void QtWidgetStringParameter::DoCreateWidget()
   connect( GetModel(), SIGNAL(UpdateGui()), this, SLOT(UpdateGUI() ) );
 
   this->setLayout(m_HLayout);
+
+  if (m_StringParam->GetRole() == Role_Output)
+    {
+    m_Input->setEnabled( false );
+    }
 }
 
 void QtWidgetStringParameter::SetValue(const QString& value)