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java - 通知网格/列表/树内网格/列表/树的更改

转载 作者:太空宇宙 更新时间:2023-11-04 07:07:15 31 4
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我看到很多人想用 mvvm 更新网格/列表/树的一部分,但他们不想刷新整个列表。

对于所有遇到此问题的人,我做了以下示例。

希望这对你有用。

最佳答案

这是一个简单的例子。整个代码中最重要的是:

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

第一个简单的pojo类:

package be.chillworld;

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

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

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<Person> getChilds() {
System.out.println("asked getter (childs) of "+ id);
return childs;
}

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

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

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

然后是 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<Person> persons;
int i;

public IndexVm() {
System.out.println("starting creating list");
persons = new ArrayList<Person>();
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<Person> getPersons() {
return persons;
}

public void setPersons(List<Person> 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");
}
}

最后是index.zul:

<?xml version="1.0" encoding="UTF-8"?>
<zk xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.zkoss.org/2005/zul"
xsi:schemaLocation="http://www.zkoss.org/2005/zul
http://www.zkoss.org/2005/zul/zul.xsd">
<window border="normal" closable="false"
apply="org.zkoss.bind.BindComposer"
viewModel="@id('vm') @init('be.chillworld.IndexVm')">
<grid width="1000px" model="@load(vm.persons)">
<columns>
<column label="naam" />
<column label="add child" />
<column label="childs" />
</columns>
<template name="model" >
<row>
<textbox value="@bind(each.naam)" />
<button onClick="@command('addChild',person = each)" label="add child"/>
<grid width="400px" model="@load(each.childs)">
<columns>
<column label="naam" />
<column label="button" />
</columns>
<template name="model" var="item">
<row>
<textbox value="@bind(item.naam)" />
<button onClick="@command('showIndex',person = item)" label="change value"/>
</row>
</template>
</grid>
</row>
</template>
</grid>
</window>
</zk>

关于java - 通知网格/列表/树内网格/列表/树的更改,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21173839/

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