Method SetEnabled

Interaction/Widgets/vtkLineWidget.cxx:234–331

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

//------------------------------------------------------------------------------
void vtkLineWidget::SetEnabled(int enabling)
{
  if (!this->Interactor)
  {
    vtkErrorMacro(<< "The interactor must be set prior to enabling/disabling widget");
    return;
  }

  if (enabling) //-----------------------------------------------------------
  {
    vtkDebugMacro(<< "Enabling line widget");

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

    if (!this->CurrentRenderer)
    {
      this->SetCurrentRenderer(this->Interactor->FindPokedRenderer(
        this->Interactor->GetLastEventPosition()[0], this->Interactor->GetLastEventPosition()[1]));
      if (this->CurrentRenderer == nullptr)
      {
        return;
      }
    }

    this->PointWidget->SetCurrentRenderer(this->CurrentRenderer);
    this->PointWidget1->SetCurrentRenderer(this->CurrentRenderer);
    this->PointWidget2->SetCurrentRenderer(this->CurrentRenderer);

    this->Enabled = 1;

    // listen for the following events
    vtkRenderWindowInteractor* i = this->Interactor;
    i->AddObserver(vtkCommand::MouseMoveEvent, this->EventCallbackCommand, this->Priority);
    i->AddObserver(vtkCommand::LeftButtonPressEvent, this->EventCallbackCommand, this->Priority);
    i->AddObserver(vtkCommand::LeftButtonReleaseEvent, this->EventCallbackCommand, this->Priority);
    i->AddObserver(vtkCommand::MiddleButtonPressEvent, this->EventCallbackCommand, this->Priority);
    i->AddObserver(
      vtkCommand::MiddleButtonReleaseEvent, this->EventCallbackCommand, this->Priority);
    i->AddObserver(vtkCommand::RightButtonPressEvent, this->EventCallbackCommand, this->Priority);
    i->AddObserver(vtkCommand::RightButtonReleaseEvent, this->EventCallbackCommand, this->Priority);

    // Add the line
    this->CurrentRenderer->AddActor(this->LineActor);
    this->LineActor->SetProperty(this->LineProperty);

    // turn on the handles
    for (int j = 0; j < 2; j++)
    {
      this->CurrentRenderer->AddActor(this->Handle[j]);
      this->Handle[j]->SetProperty(this->HandleProperty);
    }

    this->BuildRepresentation();
    this->SizeHandles();
    this->RegisterPickers();