Method LeftButtonPressEvent

Rendering/Core/vtkRenderWindowInteractor.cxx:1096–1126

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

//------------------------------------------------------------------
void vtkRenderWindowInteractor::LeftButtonPressEvent()
{
  if (!this->Enabled)
  {
    return;
  }

  // are we translating multitouch into gestures?
  if (this->RecognizeGestures)
  {
    if (!this->PointersDown[this->PointerIndex])
    {
      this->PointersDown[this->PointerIndex] = 1;
      this->PointersDownCount++;
    }
    // do we have multitouch
    if (this->PointersDownCount > 1)
    {
      // did we just transition to multitouch?
      if (this->PointersDownCount == 2)
      {
        this->InvokeEvent(vtkCommand::LeftButtonReleaseEvent, nullptr);
      }
      // handle the gesture
      this->RecognizeGesture(vtkCommand::LeftButtonPressEvent);
      return;
    }
  }

  this->InvokeEvent(vtkCommand::LeftButtonPressEvent, nullptr);
}

//------------------------------------------------------------------
void vtkRenderWindowInteractor::LeftButtonReleaseEvent()