[vtkusers] who 'observes' event?

[Amy Henderson]

At 11:00 AM 6/2/2004, A J wrote:
>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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