Method SetEnabled

Interaction/Widgets/vtkLineWidget2.cxx:78–135

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//------------------------------------------------------------------------------
void vtkLineWidget2::SetEnabled(int enabling)
{
  int enabled = this->Enabled;

  // We do this step first because it sets the CurrentRenderer
  this->Superclass::SetEnabled(enabling);

  // We defer enabling the handles until the selection process begins
  if (enabling && !enabled)
  {
    // Don't actually turn these on until cursor is near the end points or the line.
    this->CreateDefaultRepresentation();
    this->Point1Widget->SetRepresentation(
      reinterpret_cast<vtkLineRepresentation*>(this->WidgetRep)->GetPoint1Representation());
    this->Point1Widget->SetInteractor(this->Interactor);
    this->Point1Widget->GetRepresentation()->SetRenderer(this->CurrentRenderer);

    this->Point2Widget->SetRepresentation(
      reinterpret_cast<vtkLineRepresentation*>(this->WidgetRep)->GetPoint2Representation());
    this->Point2Widget->SetInteractor(this->Interactor);
    this->Point2Widget->GetRepresentation()->SetRenderer(this->CurrentRenderer);

    this->LineHandle->SetRepresentation(
      reinterpret_cast<vtkLineRepresentation*>(this->WidgetRep)->GetLineHandleRepresentation());
    this->LineHandle->SetInteractor(this->Interactor);
    this->LineHandle->GetRepresentation()->SetRenderer(this->CurrentRenderer);

    if (this->Parent)
    {
      this->Parent->AddObserver(
        vtkCommand::KeyPressEvent, this->KeyEventCallbackCommand, this->Priority);
      this->Parent->AddObserver(
        vtkCommand::KeyReleaseEvent, this->KeyEventCallbackCommand, this->Priority);
    }
    else
    {
      this->Interactor->AddObserver(
        vtkCommand::KeyPressEvent, this->KeyEventCallbackCommand, this->Priority);
      this->Interactor->AddObserver(
        vtkCommand::KeyReleaseEvent, this->KeyEventCallbackCommand, this->Priority);
    }
  }
  else if (!enabling && enabled)
  {
    this->Point1Widget->SetEnabled(0);
    this->Point2Widget->SetEnabled(0);
    this->LineHandle->SetEnabled(0);

    if (this->Parent)
    {
      this->Parent->RemoveObserver(this->KeyEventCallbackCommand);
    }
    else
    {
      this->Interactor->RemoveObserver(this->KeyEventCallbackCommand);
    }
  }
}