static {
div.setStyleName("valign-wrapper loader-wrapper");
preLoader.getElement().getStyle().setProperty("margin", "auto");
preLoader.add(new MaterialSpinner("blue"));
preLoader.add(new MaterialSpinner("red"));
preLoader.add(new MaterialSpinner("yellow"));
preLoader.add(new MaterialSpinner("green"));
}
public static void showLoading(boolean isShow, Panel con) {
if (isShow) {
if (!(con instanceof RootPanel)) {
div.getElement().getStyle().setProperty("position", "absolute");
}
div.setStyleName("valign-wrapper loader-wrapper");
div.add(preLoader);
con.add(div);
} else {
div.removeFromParent();
preLoader.removeFromParent();
}
}