[vtkusers] Actor -- isMovable?

[Piotr Byzia]

Hi,

I want to set an actor to be movable or non-movable, depending on  
settings which I control through PyQT GUI.
In other words, having a few actors on the scene I want to set  
checkboxes in my GUI that would freeze a given actor, and the rest of  
them to react as usual to the mouse movements / clicks.

Regarding visibility of the actor I'm using GetProperty().SetOpacity 
(0.0) on an instance of any given actor.
I can't see anything related to movement in the GetProperty()  
properties, I believe it's somewhere else?

Here are most important parts of the code I'm using to generate a  
single actor:

self.ren = vtk.vtkRenderer()
self.ren.SetBackground(0, 0, 0)
self.widget_3d.GetRenderWindow().AddRenderer(self.ren)

apd=vtk.vtkAppendPolyData()

for i in xrange(len(coordinates)):
     line=vtk.vtkLineSource()

     line.SetPoint1(coordinates[i][0]) # 1st atom coordinates for a  
given bond
     line.SetPoint2(coordinates[i][1]) # 2nd atom coordinates for a  
given bond
     line.SetResolution(21)
     apd.AddInput(line.GetOutput())

mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(apd.GetOutput())
lines_actor = vtk.vtkActor()
lines_actor.SetMapper(mapper)
lines_actor.GetProperty().SetColor(0.7, 0.0, 0.0)
lines_actor.GetProperty().SetOpacity(1.0)

self.ren.AddActor(lines_actor)


I found SetCurrentStyleToTrackballActor(), but I want to control this  
behavior from my GUI.
Besides, trackball mode is very inconvenient in my case, with  
molecules in "lines" representation (it's hard to pick a single line).

Thanks,
Piotr Byzia