private boolean hasSelectedNode() {
    return GraphHelpers.any(
        m_zyGraph,
        new INodeFilter<NodeType>() {
          @Override
          public boolean qualifies(final NodeType node) {
            return node.isSelected();
          }
        });
  }
Listens to mouse wheel events in edit mode.
java/zylib/src/main/java/com/google/security/zynamics/zylib/yfileswrap/gui/zygraph/editmode/ZyEditModeMouseWheelListener.java