[vtkusers] Grab Alt key once again.

[Mengda Wu]

Thanks for your reply!
I think the window manager (e.g. menu bar can intercept "Alt" key) may be
just one of the reasons.

Another reason is found to be in vtkRenderWindowInteractor.cxx/.h. If you
search for "AltKey" in the files, you will notice that the variable has not
been changed anywhere. If you search for "ControlKey", you can see the
difference.

My suggestion would be to add another variable "alt" in
SetEventInformation(). And make "AltKey" really reflects if "alt" key is
received by the vtkRenderWindowInteractor. Of course, this will also
require changes in other locations where this function is called (e.g. in
QVTKInteractorAdapter.cxx).

Thanks,
Mengda




On Mon, Sep 2, 2013 at 4:08 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> Your window manager is intercepting the alt click. If you really need
> it, then google for a solution on your specific platform.
>
>
> On Mon, Sep 2, 2013 at 3:39 PM, Mengda Wu <wumengda at gmail.com> wrote:
> > Hi all,
> >
> >    I have similar problem with Alt key on Windows 7 64 bit machine. Does
> > anyone know why is that? My guess is the alt key event is not even
> > propagated to VTK event handling. The following VTK example page also
> > mentioned this issue.
> >
> > http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/ShiftAndControl
> >
> > Thanks,
> > Mengda
> >
> >
> > On Mon, Feb 20, 2012 at 11:57 AM, Jesús Spí­nola <jspinola at gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> I want to know when the "Alt" key is pressed so I use
> >> vtkRenderWindowInteractor::GetAltKey(), but it seems it only returns
> true
> >> when "AltGr" is pressed. When I press "Alt" key, I always get false.
> >> I tested under W7 x64.
> >>
> >> Is that a bug or should I use another method?
> >>
> >> Thanks in advance!
> >>
> >> --
> >> Jesús Spínola
> >>
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