Method ProcessEventsHandler

Interaction/Widgets/vtkAbstractWidget.cxx:200–248

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkAbstractWidget::ProcessEventsHandler(
  vtkObject* vtkNotUsed(object), unsigned long vtkEvent, void* clientdata, void* calldata)
{
  vtkAbstractWidget* self = reinterpret_cast<vtkAbstractWidget*>(clientdata);

  // if ProcessEvents is Off, we ignore all interaction events.
  if (!self->GetProcessEvents())
  {
    return;
  }

  // if the event has data then get the translation using the
  // event data
  unsigned long widgetEvent = vtkWidgetEvent::NoEvent;
  if (calldata && vtkCommand::EventHasData(vtkEvent))
  {
    widgetEvent =
      self->EventTranslator->GetTranslation(vtkEvent, static_cast<vtkEventData*>(calldata));
  }
  else
  {
    int modifier = vtkEvent::GetModifier(self->Interactor);

    // If neither the ctrl nor the shift keys are pressed, give
    // NoModifier a preference over AnyModifier.
    if (modifier == vtkEvent::AnyModifier)
    {
      widgetEvent = self->EventTranslator->GetTranslation(vtkEvent, vtkEvent::NoModifier,
        self->Interactor->GetKeyCode(), self->Interactor->GetRepeatCount(),
        self->Interactor->GetKeySym());
    }

    if (widgetEvent == vtkWidgetEvent::NoEvent)
    {
      widgetEvent =
        self->EventTranslator->GetTranslation(vtkEvent, modifier, self->Interactor->GetKeyCode(),
          self->Interactor->GetRepeatCount(), self->Interactor->GetKeySym());
    }
  }

  // Save the call data for widgets if needed
  self->CallData = calldata;

  // Invoke the widget callback
  if (widgetEvent != vtkWidgetEvent::NoEvent)
  {
    self->CallbackMapper->InvokeCallback(widgetEvent);
  }
}

//------------------------------------------------------------------------------
void vtkAbstractWidget::Render()