In this recipe, we will show how to optimize widget set loading strategies. We will show how to speed up the starting of a Vaadin application by reducing the number of widgets that are initially downloaded from the server. A widget is a client-side implementation of a component, whic needs to be downloaded to the client browser.
First, we will create a simple UI class, which we are going to optimize:
public class MyVaadinUI extends UI {
@Override
protected void init(VaadinRequest request) {
new WidgetSetOptimizer().extend(this);
final VerticalLayout layout = new VerticalLayout();
layout.setMargin(true);
setContent(layout);
Button button = new Button("Click Me");
button.addClickListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
layout.addComponent(new Label("Thank you for clicking"));
}
});
layout...