Dynamic UI

Besides regular UIComponents, there are also DynamicUIComponent. This is a UI component that can be updated and rebuilt on demand. This is similar to Flutter's StatefulWidget.

This is an example of a DynamicUIComponent

public class ExampleDynamic extends DynamicUIComponent {
    private int t;

    @Override
    public void tick() {
        t++;
        rebuild();
    }

    @Override
    public UIComponent build(Layout layout) {
        return new Align.Builder()
                .withVertical(LayoutSetting.START)
                .withHorizontal(LayoutSetting.END)
                .build(new Padding(new Pad.Builder().withRight(10).withTop(10).build(), new Text.Builder(String.valueOf(t))));
    }
}

So here, you can see DynamicUIComponent has a method called tick that you can override. In this case, a value t is being incremented every tick, and the UI is being rebuilt.

danger

Note that DynamicUIComponent is an abstract class, and it has fields used to update the UI when rebuilt, DO NOT touch those unless you absolutely know what you are doing.