Method SetEnabled

Interaction/Widgets/vtkDistanceWidget.cxx:141–277

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//------------------------------------------------------------------------------
void vtkDistanceWidget::SetEnabled(int enabling)
{
  // The handle widgets are not actually enabled until they are placed.
  // The handle widgets take their representation from the
  // vtkDistanceRepresentation.
  if (enabling)
  {
    if (this->WidgetState == vtkDistanceWidget::Start)
    {
      reinterpret_cast<vtkDistanceRepresentation*>(this->WidgetRep)->VisibilityOff();
    }
    else
    {
      // The interactor must be set prior to enabling the widget.
      if (this->Interactor)
      {
        this->Point1Widget->SetInteractor(this->Interactor);
        this->Point2Widget->SetInteractor(this->Interactor);
      }

      this->Point1Widget->SetEnabled(1);
      this->Point2Widget->SetEnabled(1);
    }
  }

  if (enabling) //----------------
  {
    if (this->Enabled) // already enabled, just return
    {
      return;
    }

    if (!this->Interactor)
    {
      vtkErrorMacro(<< "The interactor must be set prior to enabling the widget");
      return;
    }

    int X = this->Interactor->GetEventPosition()[0];
    int Y = this->Interactor->GetEventPosition()[1];

    if (!this->CurrentRenderer)
    {
      this->SetCurrentRenderer(this->Interactor->FindPokedRenderer(X, Y));
      if (this->CurrentRenderer == nullptr)
      {
        return;
      }
    }

    // We're ready to enable
    this->Enabled = 1;
    this->CreateDefaultRepresentation();
    this->WidgetRep->SetRenderer(this->CurrentRenderer);

    // Set the renderer, interactor and representation on the two handle
    // widgets.
    this->Point1Widget->SetRepresentation(