I upgraded from Ubuntu 11.04 to 12.04, and as a weird side-effect, my OSG app
no longer handles middle-clicks correctly. When I inspect the GUIEventAdapter
object that represents a middle-click event, the mouse button flag is unset,
rather than set to GUIEventAdapter::MOUSE_MIDDLE_BUTTON.
My program uses SphericalManipulator, which uses middle clicks to translate the
camera focus, so this is a problem. As a workaround, I've made a subclass of
SphericalManipulator called SphericalManipulator2. It overloads the handle()
method, so that it makes a copy of the shift-leftbutton event, modifies it to
look like a middle button event, then passes the modified event to the
superclass (SphericalManipulator)'s handle() implementation. See below:
Code:
bool SphericalManipulator2::handle(const osgGA::GUIEventAdapter&
original_event, osgGA::GUIActionAdapter& adapter) {
const GUIEventAdapter* event = &original_event;
// GUIEventAdapter forces us to allocate on the heap, not the stack.
osg::ref_ptr<EventAdapter> modified_event(new EventAdapter(original_event));
int modkey = original_event.getModKeyMask();
if ( original_event.getButton() & GUIEventAdapter::LEFT_MOUSE_BUTTON &&
(modkey & GUIEventAdapter::MODKEY_SHIFT) ) {
modified_event->setButton(GUIEventAdapter::RIGHT_MOUSE_BUTTON);
event = &*modified_event;
}
return SphericalManipulator::handle(event, adapter);
}
Very oddly, the application shows no change in behavior. Shift-left clicks are
still treated as left clicks, and middle clicks are of course still being
ignored.
So two questions:
1) Is my whole approach wrong? Are there better ways of getting
SphericalManipulator to handle shift-clicks as middle clicks (to translate the
camera focus)?
2) If the approach isn't wrong, why might the above code not be working?
Any help would be greatly appreciated.
-- Matt[/list][/code]
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=48548#48548
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
