if (opened) {
canvas.setPart(LIST);
canvas.setDrawOnTop(true);
Font font = canvas.getCurrentStyle().getFont();
Border itemMargin = canvas.getCurrentStyle().getMargin();
int height = (font.getLineHeight() + itemMargin.getTotalHeight()) * options.get().size() + canvas.getCurrentStyle().getBackgroundBorder().getTotalHeight();
canvas.addInteractionRegion(mainListener, Rect2i.createFromMinAndSize(0, 0, canvas.size().x, canvas.size().y + height));
Rect2i location = Rect2i.createFromMinAndSize(0, canvas.size().y, canvas.size().x, height);
canvas.drawBackground(location);
int itemHeight = itemMargin.getTotalHeight() + font.getLineHeight();
canvas.setPart(LIST_ITEM);
for (int i = 0; i < optionListeners.size(); ++i) {
if (optionListeners.get(i).isMouseOver()) {
canvas.setMode(HOVER_MODE);
} else {
canvas.setMode(DEFAULT_MODE);
}
Rect2i itemRegion = Rect2i.createFromMinAndSize(0, canvas.size().y + itemHeight * i, canvas.size().x, itemHeight);
canvas.drawBackground(itemRegion);
optionRenderer.draw(options.get().get(i), canvas, itemMargin.shrink(itemRegion));
canvas.addInteractionRegion(optionListeners.get(i), itemRegion);
}
} else {
canvas.addInteractionRegion(mainListener);
}