[vtkusers] who 'observes' event?

[A J]

Thanks Amy for your reply,

So I've already tried adding the abserver for KeyPressEvent on Iren, but 
nothing happens..
So how do I know if the render window this interactor uses is 'in 
focus'.......?


>From: Amy Henderson <amy.henderson at kitware.com>
>To: vtkusers at vtk.org
>Subject: Re: [vtkusers] who 'observes' event?
>Date: Wed, 02 Jun 2004 10:49:23 -0400
>
>Hi AJ,
>
>The whole point of using events is that you don't manually invoke them; 
>they are indications that something happened. As a VTK user, you write code 
>that watches for events and does something when a particular event occurs. 
>Add an observer for the KeyPressEvent on the render window interactor 
>(Iren, in your code). The event should happen if the render window this 
>interactor is used in has focus.
>
>- Amy
>
>At 10:42 AM 6/2/2004, A J wrote:
>>..or do I have to make my own InteractorStyle which invokes a keypress 
>>event somehow (using openGL functions I guess?)
>>I can't really find in the documentation anything that would invoke a 
>>KeyPressEvent
>>Thanks again!!!!
>>
>>
>>>From: Amy Henderson <amy.henderson at kitware.com>
>>>To: vtkusers at vtk.org
>>>Subject: Re: [vtkusers] who 'observes' event?
>>>Date: Wed, 02 Jun 2004 08:36:20 -0400
>>>
>>>Hi AJ,
>>>
>>>The Enter event is not for detecting when the Enter key on the keyboard 
>>>is pressed. The Enter event is invoked when the mouse pointer enters the 
>>>render window. (There is also a Leave event.) To detect when Enter is 
>>>pressed, you probably need to watch vtkCommand::KeyPressEvent and add 
>>>code yourself for checking whether the key that was pressed is the Enter 
>>>key.
>>>
>>>- Amy
>>>
>>>At 10:20 PM 6/1/2004, A J wrote:
>>>>Hi,
>>>>
>>>>regarding the problem of my last post - maybe the problem is I haven't 
>>>>added an observer to the correct object
>>>>
>>>>I tried it with
>>>>
>>>>            RenWin->AddObserver( vtkCommand::EnterEvent, cbc );
>>>>and       Ren-> "
>>>>and       Iren-> "
>>>>
>>>>(note that I am calling Iren->Render() to render my scene)
>>>>
>>>>but none of them seem to detect when I press the Enter key on my 
>>>>keyboard..
>>>>
>>>>If I change it to detecting Ren->AddObserver( vtkCommand::ModifiedEvent, 
>>>>cbc)
>>>>Then this works fine
>>>>
>>>>But thats the only one that I can get to work
>>>>Really I would like it to detect when I press Enter!
>>>>
>>>>So if anyone has any insight.. then please englighten me..! =S
>>>>Thank you in advance once again =)
>>>>
>>>>AJ
>>>>
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>>>
>>>
>>>
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>
>
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><http://public.kitware.com/cgi-bin/vtkfaq>
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