[vtkusers] who 'observes' event?

[A J]

No because I don't do Iren->Start()
I only do Iren->Render()

I can't have it do Iren->Start() because then it will remain in this loop 
forever..

I have data which is modified many times a second, and every time it is 
modified, I call Iren->Render()

Thats the basics of it..


>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'.......?
>
>Can you interact with the data in it? (e.g., rotate it with the mouse, 
>etc.)
>- Amy
>
>
>>>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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