// This method performs intersection testing at the given XY coords, and returns true if
// any intersections were found. It will break after processing the first pickable Window
// it finds.
bool WindowManager::pickAtXY(float x, float y, WidgetList& wl)
{
Intersections intr;
osg::Camera* camera = _view->getCamera();
osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(camera->getGraphicsContext());
if (gw)
{
_view->computeIntersections(camera, osgUtil::Intersector::WINDOW, x, y, intr, _nodeMask);
}
if (!intr.empty())
{
// Get the first Window at the XY coordinates; if you want a Window to be
// non-pickable, set the NodeMask to something else.
Window* activeWin = 0;
// Iterate over every picked result and create a list of Widgets that belong
// to that Window.
for(Intersections::iterator i = intr.begin(); i != intr.end(); i++) {
Window* win = dynamic_cast<Window*>(i->nodePath.back()->getParent(0));
// Make sure that our window is valid, and that our pick is within the
// "visible area" of the Window.
if(
!win ||
(win->getVisibilityMode() == Window::VM_PARTIAL && !win->isPointerXYWithinVisible(x, y))
) {
continue;
}
// Set our activeWin, so that we know when we've got all the Widgets
// that belong to it.
if(!activeWin) activeWin = win;
// If we've found a new Widnow, break out!
else if(activeWin != win) break;
Widget* widget = dynamic_cast<Widget*>(i->drawable.get());
if(!widget) continue;
// We need to return a list of every Widget that was picked, so
// that the handler can operate on it accordingly.
else wl.push_back(widget);
}
if(wl.size()) {
// Potentially VERY expensive; only to be used for debugging. :)
if(_flags & WM_PICK_DEBUG) _updatePickWindow(&wl, x, y);
return true;
}
}
if(_flags & WM_PICK_DEBUG) _updatePickWindow(0, x, y);
return false;
}
