Bug 1498: GraphUI: Fix Picking Traversal throughout Groups in Z-Descending Order, testing Children and fallback to Group if positive

Picking algo in Z-Ascending order worked only by chance, as it picked up any bottom node.

+++

Proper algo is in Z-Descending order to block occluded (child) nodes:

for-all s : shapes
  p1 = testPicking(s)
  if ( s is Container ) {
    p2 = testPicking(s.childs)
    if( null != p2 ) {
      p1 = p2; // override w/ child prio
    }
  }
  return p1
}

Further, testPicking(shape) shall only return a positive shape,
if the event dispatching check (mouse-over, click, ..)
signals end-of-traversal - as originally intended.

Overall philosophy is to pick the 'deepest' child of a group
if responding, otherwise the next higher interactive group.

0 files changed, 0 insertions, 0 deletions