GridScrollToTest.java

package com.example.application;

import com.vaadin.flow.component.UI;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.component.page.Push;
import com.vaadin.flow.data.provider.ListDataProvider;
import com.vaadin.flow.router.Route;
import com.vaadin.flow.theme.Theme;
import com.vaadin.flow.theme.lumo.Lumo;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.UUID;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;

@Route("scrollTo")
@Theme(Lumo.class)
@Push
public class GridScrollToTest extends VerticalLayout {

    private Grid<Dto> grid = null;
    private ListDataProvider<Dto> dataProvider;

    public GridScrollToTest() {
        setSizeFull();
        ScheduledExecutorService scheduler = newSingleThreadScheduledExecutor();

        Button addItem = new Button("Add");
        addItem.addClickListener(buttonClickEvent -> {
            dataProvider.getItems().add(getNewMockDto());
            dataProvider.refreshAll();
            Optional<UI> optionalUI = addItem.getUI();
            if (optionalUI.isPresent()) {
                UI ui = optionalUI.get();
                scheduler.schedule(() -> {
                    ui.access(() -> {
                        grid.scrollToIndex(dataProvider.getItems().size());
                    });
                }, 100, TimeUnit.MILLISECONDS);
            }
        });


        grid = new Grid<>(Dto.class);
        List<Dto> data = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            data.add(getNewMockDto());
        }
        dataProvider = new ListDataProvider<>(data);
        grid.setDataProvider(dataProvider);

        add(addItem, grid);
    }

    private Dto getNewMockDto() {
        return new Dto(UUID.randomUUID().toString());
    }

    public static class Dto {
        private String uuid;

        public Dto(String uuid) {
            super();
            this.uuid = uuid;
        }

        public String getUuid() {
            return uuid;
        }
    }
}