notify change of grid/list/tree inside a grid/list/tree

Question

I saw multiple questions of people who wants to update a part of a grid/list/tree with mvvm but they didn\'t wanted to refresh the whole list.

For all the people who has

Answer 1

This is a simpel example. The most important of the whole code is this :

BindUtils.postNotifyChange(null, null, person, "childs");

First simple pojo class :

package be.chillworld;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author chillworld
 */
public class Person {
    private int id;
    private String naam;
    private List childs = new ArrayList();

    public Person(int id) {
        this.id = id;
        naam = "test " + id;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setNaam(String naam) {
        this.naam = naam;
    }

    public String getNaam() {
        System.out.println("asked getter (naam) of "+ id);
        return naam;
    }

    public List getChilds() {
        System.out.println("asked getter (childs) of "+ id);
        return childs;
    }

    public void setChilds(List childs) {
        this.childs = childs;
    }

    public boolean addChild(Person person) {
        return childs.add(person);
    }

    @Override
    public String toString() {
        return "Person{" + "id=" + id + ", name=" + getNaam() + '}';
    }
}

then the IndexVM:

package be.chillworld;

import java.util.ArrayList;
import java.util.List;
import org.zkoss.bind.BindUtils;
import org.zkoss.bind.annotation.BindingParam;
import org.zkoss.bind.annotation.Command;

/**
 *
 * @author chillworld
 */
public class IndexVm {

    private List persons;
    int i;

    public IndexVm() {
        System.out.println("starting creating list");
        persons = new ArrayList();
        for (i = 0; i < 100; i++) {
            Person person = new Person(i);
            person.addChild(new Person(++i));
            persons.add(person);
        }
        System.out.println("ending creating list");

    }

    public List getPersons() {
        return persons;
    }

    public void setPersons(List persons) {
        this.persons = persons;
    }

    @Command
    public void showIndex(@BindingParam("person") Person person) {
        System.out.println("changed name");
        person.setNaam("Chillworld");
        BindUtils.postNotifyChange(null, null, person, "naam");
    }

    @Command
    public void addChild(@BindingParam("person") Person person) {
        System.out.println("add child");
        Person child = new Person(++i);
        child.setNaam("new child");
        person.addChild(child);
        BindUtils.postNotifyChange(null, null, person, "childs");
    }
}

and at last the index.zul :