Timeline DragDrop

package org.primefaces.showcase.view.data.timeline;

import org.primefaces.component.timeline.TimelineUpdater;
import org.primefaces.event.timeline.TimelineDragDropEvent;
import org.primefaces.model.timeline.TimelineEvent;
import org.primefaces.model.timeline.TimelineModel;
import org.primefaces.showcase.domain.Event;

import java.io.Serializable;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

import jakarta.annotation.PostConstruct;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.context.FacesContext;
import jakarta.faces.event.AjaxBehaviorEvent;
import jakarta.faces.view.ViewScoped;
import jakarta.inject.Named;

@Named("dndTimelineView")
@ViewScoped
public class DndTimelineView implements Serializable {

    private TimelineModel<Event, ?> model;

    private LocalDateTime start;
    private LocalDateTime end;

    private final List<Event> events = new ArrayList<>();

    @PostConstruct
    public void init() {
        start = LocalDateTime.now().minusHours(4);
        end = LocalDateTime.now().plusHours(8);

        model = new TimelineModel<>();

        for (int i = 1; i <= 10; i++) {
            events.add(new Event("Event " + i));
        }

    }

    public void onDrop(TimelineDragDropEvent<Event> e) {
        // get dragged model object (event class) if draggable item is within a data iteration component,
        // update event's start and end dates.
        Event dndEvent = e.getData();
        dndEvent.setStart(e.getStartDate());
        dndEvent.setEnd(e.getEndDate());

        // create a timeline event (not editable)
        TimelineEvent event = TimelineEvent.builder()
                .data(dndEvent)
                .startDate(e.getStartDate())
                .endDate(e.getEndDate())
                .editable(false)
                .group(e.getGroup())
                .build();

        // add a new event
        TimelineUpdater timelineUpdater = TimelineUpdater.getCurrentInstance(":form:timeline");
        model.add(event, timelineUpdater);

        // remove from the list of all events
        events.remove(dndEvent);

        FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO, "The " + dndEvent.getName() + " was added", null);
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }

    public void onSwitchTimeZone(AjaxBehaviorEvent e) {
        model.clear();
    }

    public TimelineModel<Event, ?> getModel() {
        return model;
    }

    public List<Event> getEvents() {
        return events;
    }

    public LocalDateTime getStart() {
        return start;
    }

    public LocalDateTime getEnd() {
        return end;
    }
}

package org.primefaces.showcase.domain;

import java.io.Serializable;
import java.time.LocalDateTime;

public class Event implements Serializable {

    private String name;
    private LocalDateTime start;
    private LocalDateTime end;

    public Event(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public LocalDateTime getStart() {
        return start;
    }

    public void setStart(LocalDateTime start) {
        this.start = start;
    }

    public LocalDateTime getEnd() {
        return end;
    }

    public void setEnd(LocalDateTime end) {
        this.end = end;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Event event = (Event) o;

        if (name != null ? !name.equals(event.name) : event.name != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        return name != null ? name.hashCode() : 0;
    }
}