[vtkusers] BreakLoopFlag in vtkXRenderWindowInteractor

[Berk Geveci]

	Thanks Chris,

	It's been already implemented.

	Berk

Chris Myers wrote:
> 
> I saw in the recent changes log that the vtkXRenderWindowInteractor
> has finally been fixed to return gracefully rather than exiting
> entirely:
> 
> =============================================================================
> U graphics/vtkXRenderWindowInteractor.cxx
> 
>   revision 1.88
> date: 2000/10/03 15:50:40;  author: berk;  state: Exp;  lines: +20 -3
> Changed Start() so that it returns instead of calling exit()
> =============================================================================
> 
> I've downloaded the latest nightly release, and indeed, the Interactor
> returns instead of calling exit(), as advertised.  This is particularly
> useful inside an interpreter like Python.
> 
> Unfortunately, a subsequent call to vtkXRenderWindowInteractor::Start()
> does not restart the interactor, because the internal BreakLoopFlag
> is still set to 1 (from the previous exit) and the interactor just
> turns around and returns again.
> 
> To be really useful, there needs to be some way of resetting the
> BreakLoopFlag to 0 so that control can be returned to the interactor
> once more.  Here are some possibilities:
> 
> (1) Put an explicit call to this->BreakLoopFlag=0 inside
> vtkXRenderWindowInteractor::Start() before entering the do-while
> loop that checks the value of BreakLoopFlag.
> 
> (2) Provide a new Restart() method on vtkXRenderWindowInteractor that
> sets the flag back to 0 and calls Start() again.
> 
> (3) Expose the SetBreakLoopFlag method to the wrapped Python interface
> so that the user can reset it before calling Start() again.
> 
> Option (1) worked for me when I tried it.  (It seemed to be the
> simplest and quickest thing to try.)  Option (3) seems to be the least
> preferable.  Any of the three is preferable to nothing at all.  It
> would be nice if a decision could be made, and the code updated.
> 
> Thanks,
> 
> Chris
> 
> ==========================================================================
> Chris Myers
> Cornell Theory Center
> --------------------------------------------------------------------------
> 636 Rhodes Hall              email: myers at tc.cornell.edu
> Cornell University           phone: (607) 255-5894 / fax: (607) 254-8888
> Ithaca, NY 14853             http://www.tc.cornell.edu/~myers
> ==========================================================================
> 
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