[osg-users] CompositeViewer issues

Brad Huber bradh at procerus.com
Fri Apr 29 10:54:17 PDT 2011


A while back I sent an email regarding a bug in CompositeViewer.  Please see
the text below.  I've also reattached the code for convenience.

The bug still exists in the trunk code and I am currently trying to resolve
it.  I am trying to get a little better understanding before I submit any
possible changes.  Basically my question is when the frame of the
window/graphics context is selected (but the mouse has not yet been over any
views within the window), what view do you send/address events to?  I think
the main thing that I am wondering is since a context can contain multiple
views, is there a "master" view per context?

Thanks
-Brad

-----Original Message-----
From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Brad Huber
Sent: Monday, September 27, 2010 9:07 AM
To: 'OpenSceneGraph Users'
Subject: Re: [osg-users] CompositeViewer issues

Has anyone had a chance to try the sample program I posted to see if the bug
is the same in Linux?

Thanks
-Brad

-----Original Message-----
From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Brad Huber
Sent: Thursday, September 23, 2010 1:22 PM
To: 'OpenSceneGraph Users'
Subject: Re: [osg-users] CompositeViewer issues

Robert,

Attached is a simple stripped down app that demonstrates the problem.

The program creates two windows (2 views total).  The 1st has a HUD and the
2nd doesn't.  Resizing the 2nd window causes the HUD in the first window to
resize (it shouldn't).  I am reliably producing this bug on my Win7 machine.
I'm quite confident that this bug will be reproducible on all Windows.  I am
a little bit less sure of Linux/Mac, etc.

I've included a Visual Studio 2005 project but since there is only one
source file it should be easy to get it building under Linux.

Thanks
-Brad

-----Original Message-----
From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: Wednesday, September 22, 2010 2:25 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] CompositeViewer issues

Hi Brad,

Could you see if you can reproduce this problem with the one of the OSG
examples, or a small tweak of one to reproduce this problem.  If I can
reproduce it reliably then there is a much better chance of spotting the
culprit and finding a solution.

Cheers,
Robert.

On Tue, Sep 21, 2010 at 10:27 PM, Brad Huber <bradh at procerusuav.com> wrote:
> Hello,
>
>
>
> I recently converted our osg based application over to use Composite
Viewer
> because we need multiple Views on the same scene graph.  I’m running 
> in to
a
> little snag which appears to be a bug in CompositeViewer.
>
>
>
> Simple way of explaining the manifestation of the issue is that I have 
> two Windows and two Views (one view per window) and they both have 
> event handlers attached to the views which react to the 
> osgGA::GUIEventAdapter::RESIZE event.  Resizing works hunky dory for 
> view
0
> but it does not work correctly for view 1.  I believe the culprit is
related
> to these lines of code found in CompositeViewer::eventTraversal().
>
>
>
> osgViewer::View* masterView = getViewWithFocus() ? getViewWithFocus() :
> _views[0].get();
>
> .
>
> .
>
> .
>
> viewEventsMap[masterView].insert( viewEventsMap[masterView].end(), 
> gw_events.begin(), gw_events.end() );
>
>
>
> The problem is that when resizing, apparently getViewWithFocus() 
> returns NULL (I guess because the mouse is over the window frame and 
> not the view within the window.  Therefore a resize event is taken out 
> of the graphics window queue for the 2nd window and stuck into the 
> event queue for the 0 view (a mismatch).  The effect for me is that 
> the when I resize one window the HUD I have set up in the other window 
> receives the resize event and changes which obviously isn’t what I want J.
>
>
>
> This does seem to be somewhat intermittent and may be related to 
> whether your mouse tends to fall off the window frame towards the view 
> or away
from
> the view

>
>
>
> PS I don’t have a solution in hand yet.  I thought I would throw this 
> out there in case it’s a known issue or something.
>
>
>
> Thanks
>
> -Brad
>
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.
> org
>
>
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