public void setColors(List<Color> colors) {
   model.setColors(colors);
 }
 public InputGraph getFirstSnapshot() {
   return group.getGraphs().get(model.getFirstPosition());
 }
 public InputGraph getSecondSnapshot() {
   return group.getGraphs().get(model.getSecondPosition());
 }
 public CompilationViewModel(RangeSliderModel model, Group group) {
   this.model = model;
   this.group = group;
   model.getChangedEvent().addListener(rangeSliderChangedListener);
 }