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index.zulzul<?link rel="stylesheet" type="text/css" href="/style.css"?>
<window viewModel="@id('vm') @init('pkg$.TodoListViewModel')"
border="normal" width="60%" vflex="1" style="margin:auto" >
<caption label="My ToDo List" iconSclass="z-icon-list-alt" />
<vlayout hflex="1" vflex="1">
<hlayout hflex="1">
<textbox value="@bind(vm.subject)" onOK="@command('addTodo')" hflex="1" placeholder="What needs to be done?" />
<button onClick="@command('addTodo')" iconSclass="z-icon-plus-square" />
</hlayout>
<listbox model="@init(vm.todoListModel)" vflex="1">
<listhead>
<listheader hflex="min"/> <!-- checkbox -->
<listheader/> <!-- TO-DO item -->
<listheader hflex="min"/> <!-- delete button -->
</listhead>
<template name="model">
<listitem >
<listcell>
<checkbox checked="@init(each.complete)@save(each.complete)" onCheck="@command('completeTodo',todo=each)"/>
</listcell>
<listcell>
<textbox value="@init(each.subject)@save(each.subject)" inplace="true" width="100%"
sclass="@load(each.complete?'complete-todo':'')" onChange="@command('updateTodo', todo=each)"/>
</listcell>
<listcell>
<button onClick="@command('deleteTodo',todo=each)" iconSclass="z-icon-times"/>
</listcell>
</listitem>
</template>
</listbox>
</vlayout>
</window>TodoListViewModel.javajava
import org.zkoss.bind.BindUtils;
import org.zkoss.bind.annotation.*;
import org.zkoss.lang.Strings;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zul.ListModelList;
import java.util.*;
public class TodoListViewModel {
//data for the view
private String subject;
private ListModelList<Todo> todoListModel;
//service class
private TodoListService todoListService = new TodoListService();
public TodoListViewModel(){
//get data from the service layer
List<Todo> todoList = todoListService.getTodoList();
//ListModelList optimizes rendering performance for ZK components
todoListModel = new ListModelList<Todo>(todoList);
}
@Command //@Command declares a command method
@NotifyChange("subject") //@NotifyChange tells ZK which property changed by this method
public void addTodo(){
if(Strings.isBlank(subject)){
Clients.showNotification("Subject is blank, nothing to do ?");
}else{
//save data
Todo todo = new Todo(subject);
todo = todoListService.saveTodo(todo);
//update the model, by using ListModelList, you don't need to notify todoListModel change
//it is efficient that only update one item of the listbox
todoListModel.add(todo);
//clear value for the next todo.
subject = null;
}
}
@Command
public void completeTodo(@BindingParam("todo") Todo todo){
//update to the database
todoListService.updateTodo(todo);
BindUtils.postNotifyChange(null, null, todo, "complete");
}
@Command
public void deleteTodo(@BindingParam("todo") Todo todo){
//delete the todo in the database
todoListService.deleteTodo(todo);
//update ListModel, by using ListModelList, you don't need to notify todoListModel change
todoListModel.remove(todo);
}
@Command
public void updateTodo(@BindingParam("todo") Todo todo){
//update todo in the database
todoListService.updateTodo(todo);
}
//getter & setter for the binding of the view
public ListModelList<Todo> getTodoListModel() {
return todoListModel;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
}
TodoListService.javajava
import java.util.*;
/**
* using synchronized is just because we use static userList in this demo to for the concurrent access.
*/
public class TodoListService {
static int todoId = 0;
static List<Todo> todoList = new ArrayList<Todo>();
static{
todoList.add(new Todo(todoId++,"dig a hole"));
todoList.add(new Todo(todoId++,"name it love"));
todoList.add(new Todo(todoId++,"watch people fell in love"));
}
public synchronized List<Todo>getTodoList() {
List<Todo> list = new ArrayList<Todo>();
for(Todo todo:todoList){
list.add(Todo.clone(todo));
}
return list;
}
public synchronized Todo getTodo(Integer id){
int size = todoList.size();
for(int i=0;i<size;i++){
Todo t = todoList.get(i);
if(t.getId().equals(id)){
return Todo.clone(t);
}
}
return null;
}
public synchronized Todo saveTodo(Todo todo){
todo = Todo.clone(todo);
todo.setId(todoId++);
todoList.add(todo);
return todo;
}
public synchronized Todo updateTodo(Todo todo){
if(todo.getId()==null){
throw new IllegalArgumentException("can't update a null-id todo, save it first");
}else{
todo = Todo.clone(todo);
int size = todoList.size();
for(int i=0;i<size;i++){
Todo t = todoList.get(i);
if(t.getId().equals(todo.getId())){
todoList.set(i, todo);
return todo;
}
}
throw new RuntimeException("Todo not found "+todo.getId());
}
}
public synchronized void deleteTodo(Todo todo){
if(todo.getId()!=null){
int size = todoList.size();
for(int i=0;i<size;i++){
Todo t = todoList.get(i);
if(t.getId().equals(todo.getId())){
todoList.remove(i);
return;
}
}
}
}
}
Todo.javajava
import java.io.Serializable;
/**
* Todo entity
*/
public class Todo implements Serializable, Cloneable {
private static final long serialVersionUID = 1L;
Integer id;
boolean complete;
String subject;
public Todo() {
}
public Todo(Integer id, String subject) {
this.id = id;
this.subject = subject;
}
public Todo(String subject) {
this.subject = subject;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public boolean isComplete() {
return complete;
}
public void setComplete(boolean complete) {
this.complete = complete;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Todo other = (Todo) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
public static Todo clone(Todo todo) {
try {
return (Todo) todo.clone();
} catch (CloneNotSupportedException e) {
// not possible
}
return null;
}
}