/** Updates view. Rebuilds items and label if necessary, recalculate items sizes. */
private void updateView() {
if (rebuildItems()) {
calculateLayoutWidth(getWidth(), MeasureSpec.EXACTLY);
layout(getWidth(), getHeight());
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
layout(r - l, b - t);
}