public native boolean defaultTrack(Tracker tracker);
public native void defaultDraw(Drawer drawer);
protected boolean onDraw(Drawer drawer) {
Callable onDrawEntry = list.getOnDrawEntry();
if (onDrawEntry != null) {
Object result = ScriptographerEngine.invoke(onDrawEntry, list, drawer, this);
if (result != null)
return ConversionUtils.toBoolean(result);
}