for (int i = 0; i < displayables.size(); i++) {
IDisplayable disp = displayables.get(i);
if (!disp.isSliding()) {
disp.setIdleTime(currentTime - lastTime, true);
} else {
redraw = redraw || disp.slide();
}
}
if (backSize != null) {
redraw = redraw || doMoveUnits(currentTime - lastTime);
redraw = redraw || doScroll();