[vtkusers] Handling "holding down" a key

[Jim Peterson]

FWIW, I would consider modifying the image in an orientationWidget to 
indicate which plane was selected.

David Gobbi wrote:
> Hi David,
>
> Clicking the 'x' key to change the state is preferable.  You just need
> to add a visual cue to inform the user of the current state, e.g. you
> can change the shape of the mouse cursor or draw a horizontal arrow
> somewhere.
>
>   David
>
>
> On Sun, Sep 12, 2010 at 9:20 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
>   
>> On Sun, Sep 12, 2010 at 10:35 AM, David Gobbi <david.gobbi at gmail.com> wrote:
>>     
>>> Hi David,
>>>
>>> The "key repeat" is done by the operating system, not by VTK.  The
>>> only keys that do not repeat are the modifier keys: shift, control,
>>> alt, etcetera.  What key are you using, and on what operating system
>>> or GUI toolkit?
>>>
>>> The work-around is to add a timer to your code, so that if a repeat
>>> occurs within a certain number of milliseconds you can ignore it.
>>>
>>>  David
>>>       
>> I am on Fedora 13, using the 'x' key, and from a standard
>> vtkRenderWindow (no GUI toolkit).
>>
>> I am trying to modify vtkInteractorStyleTrackballActor to allow the
>> user to "lock" the translation or rotation of an actor to a single
>> axis at a time. That is, if I'm holding the 'x' key while translating
>> the actor (moving the mouse with the middle mouse button held down) I
>> want the actor only to move along the x axis. I guess the easy fix is
>> to do this by toggling the flag with a keypress rather than dealing
>> with using a timer to allow the key to be held down? The problem is
>> the user has no way to track the state of this flag - where if he was
>> holding down the key the state would be obvious!
>>
>> David D.
>>
>>     
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