Method OnLeftButtonDown

Interaction/Style/vtkInteractorStyleImage.cxx:198–236

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//------------------------------------------------------------------------------
void vtkInteractorStyleImage::OnLeftButtonDown()
{
  int x = this->Interactor->GetEventPosition()[0];
  int y = this->Interactor->GetEventPosition()[1];

  this->FindPokedRenderer(x, y);
  if (this->CurrentRenderer == nullptr)
  {
    return;
  }

  // Redefine this button to handle window/level
  this->GrabFocus(this->EventCallbackCommand);
  if (!this->Interactor->GetShiftKey() && !this->Interactor->GetControlKey())
  {
    this->WindowLevelStartPosition[0] = x;
    this->WindowLevelStartPosition[1] = y;
    this->StartWindowLevel();
  }

  // If shift is held down, do a rotation
  else if (this->InteractionMode == VTKIS_IMAGE3D && this->Interactor->GetShiftKey())
  {
    this->StartRotate();
  }

  // If ctrl is held down in slicing mode, slice the image
  else if (this->InteractionMode == VTKIS_IMAGE_SLICING && this->Interactor->GetControlKey())
  {
    this->StartSlice();
  }

  // The rest of the button + key combinations remain the same

  else
  {
    this->Superclass::OnLeftButtonDown();
  }
}

//------------------------------------------------------------------------------
void vtkInteractorStyleImage::OnLeftButtonUp()