[osg-users] osgWidget::WindowManager::_lastEvent suggestion

[Simon Notheis]

Hi Robert,

sorry for my late reply, but your posting didn't make it to the gmane newsgroup which I am using. So I'll give the forum a try :-)

I didn't modify the OSG code because we're using various installations here (windows and linux). The WindowManager has a memeber
EventInterface* _lastEvent which tracks the last EventInterface (i.e. Widget) that received a mouse event (ENTER, PUSH, ....).

If a new mouse event is received, the WindowManager checks if he should send a mouse LEAVE event to the widget stored in _lastEvent.

What I do, is that I initially focus the widgets/menus via mouse, but then use keyboard interaction to select items and that interaction my replace all widgets in the menu list by new ones. So when I after that move the mouse again, WindowManager tries to send a mouse LEAVE to _lastEvent which at that mpoint may be an invalid pointer.

So my idea was to just use osg::ref_ptr<EventInterface> _lastEvent instead and do some additional _lastEvent.valid() checks. But since I'm not too familiar with the internals of the WindowManager I don't know exactly what implications this would have.

In our own code, we are just forwarding the WindowManagers mouse and keyboard event to our own listener classes, so I just added a ref_ptr there, so that I have a "backup" of the original widget that is stored in WindowManager::_lastEvent so that the WM can call whatever function he wants.

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