Hi Gianni, Rather than adding/removing the event handler I would add a flag to the event handle to say whether it's active or not and then enable/disable as required.
Robert. On 24 October 2014 08:57, Gianni Ambrosio <[email protected]> wrote: > Hi All, > I implemented a PointPicker derived from osgGA::GUIEventHandler and > overloading: > > virtual bool handle(const osgGA::GUIEventAdapter& > ea,osgGA::GUIActionAdapter& aa, osg::Object*, osg::NodeVisitor*); > > in which I handle both osgGA::GUIEventAdapter::PUSH and > osgGA::GUIEventAdapter::RELEASE cases and always return false. > > In my Qt application I have a ViewerWidget that inherits from > osgQt::GLWidget and osgViewer::CompositeViewer. All key events ara handled > in ViewerWidget by overloading keyPressEvent(QKeyEvent*). > Now, I thought to activate the PointPicker by pressing 'C' key. So for > "Qt::Key_C" key I call: > > getView(0)->addEventHandler(pointPicker); > > Since the point picker must be deactivated after the first pick, then I > thought to handle the mouse release event on the ViewerWidget side also, > overloading the method mouseReleaseEvent: > > ViewerWidget::mouseReleaseEvent(QMouseEvent* event) > > where I call: > > superclass::mouseReleaseEvent(event); > getView(0)->removeEventHandler(pointPicker); > > The problem is that when removeEventHandler is called the event has not > been already processed by PointPiker::handle(...). So > osgGA::GUIEventAdapter::RELEASE case never happens. I tryed to call > eventTraversal() as follows: > > superclass::mouseReleaseEvent(event); > eventTraversal(); > getView(0)->removeEventHandler(pointPicker); > > but unfortunately it does not solve the problem. > > I found a workaround but I will appreciate if someone could explain how to > solve this case. > > Regards, > Gianni > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=61405#61405 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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