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index.zulzul<zk>
No form binding
<div viewModel="@id('vm')@init('pkg$.SelectedItemsViewModel')">
With forEach
<listbox multiple="true"
selectedItems="@bind(vm.selectedItems)">
<forEach items="@load(vm.items)" var="item">
<listitem value="${item}">
<listcell label="${item.label}" />
</listitem>
</forEach>
</listbox>
With model
<listbox multiple="true" model="@load(vm.items)" selectedItems="@bind(vm.selectedItems)">
<template name="model" var="item">
<listitem value="${item}">
<listcell label="${item.label}"/>
</listitem>
</template>
</listbox>
Selected Entries
<button label="select first item" onClick="@command('setFirstItemSelection')"/>
<separator bar="true" orient="horizontal" />
<listbox model="@load(vm.selectedItems)">
<template name="model" var="item">
<listitem value="${item}">
<listcell label="${item.label}"/>
</listitem>
</template>
</listbox>
</div>
<separator bar="true" orient="horizontal" />
form binding
<div viewModel="@id('vm2')@init('pkg$.SelectedItemsProxyViewModel')">
<div form="@id('fx') @load(vm2.itemContainer) @save(vm2.itemContainer, before={'save'}) ">
with forEach
<!-- WORKAROUND: custom converter -->
<!--<listbox multiple="true" selectedItems="@bind(vm2.selectedItems) @converter(vm2.proxiedListitemComparator)"> -->
<listbox multiple="true" selectedItems="@bind(vm2.selectedItems)">
<forEach items="@load(fx.items)" var="item">
<listitem value="${item}">
<listcell label="${item.label}" />
</listitem>
</forEach>
</listbox>
<!-- WORKAROUND: custom converter -->
<!--<listbox multiple="true" model="@load(fx.items)" selectedItems="@bind(vm2.selectedItems) @converter(vm2.proxiedListitemComparator)">-->
With model
<listbox multiple="true" model="@load(fx.items)" selectedItems="@bind(vm2.selectedItems)">
<template name="model" var="item">
<listitem value="${item}">
<listcell label="${item.label}"/>
</listitem>
</template>
</listbox>
</div>
<button label="select first item" onClick="@command('setFirstItemSelection')"/>
<separator bar="true" orient="horizontal" />
Selected entries
<listbox model="@load(vm2.selectedItems)">
<template name="model" var="item">
<listitem value="${item}">
<listcell label="${item.label}"/>
</listitem>
</template>
</listbox>
</div>
</zk>SelectedItemsViewModel.javajavaimport java.util.LinkedList;
import java.util.List;
import org.zkoss.bind.BindUtils;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.Init;
public class SelectedItemsViewModel {
private List<Item> items;
private List<Item> selectedItems;
@Init
public void init() {
items = new LinkedList<Item>();
selectedItems = new LinkedList<Item>();
items.add(new Item("a"));
items.add(new Item("b"));
items.add(new Item("c"));
selectedItems.add(items.get(1));
selectedItems.add(items.get(2));
}
public List<Item> getSelectedItems() {
return selectedItems;
}
public void setSelectedItems(List<Item> selectedItems) {
this.selectedItems = selectedItems;
}
public List<Item> getItems() {
return items;
}
@Command
public void setFirstItemSelection() {
// selectedItems.clear();
selectedItems.add(items.get(0));
BindUtils.postNotifyChange(null, null, this, "selectedItems");
}
}
SelectedItemsProxyViewModel.javajava
import java.util.LinkedList;
import java.util.List;
import org.zkoss.bind.BindUtils;
import org.zkoss.bind.Converter;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.Init;
public class SelectedItemsProxyViewModel {
private ItemsContainer itemContainer;
private List<Item> selectedItems;
private Converter proxiedListitemConverter;
@Init
public void init() {
List<Item >items = new LinkedList<Item>();
selectedItems = new LinkedList<Item>();
items.add(new Item("a"));
items.add(new Item("b"));
items.add(new Item("c"));
selectedItems.add(items.get(1));
selectedItems.add(items.get(2));
itemContainer = new ItemsContainer(items);
}
public List<Item> getSelectedItems() {
return selectedItems;
}
public void setSelectedItems(List<Item> selectedItems) {
this.selectedItems = selectedItems;
}
public ItemsContainer getItemContainer() {
return itemContainer;
}
@Command
public void setFirstItemSelection() {
// selectedItems.clear();
selectedItems.add(itemContainer.getItems().get(0));
BindUtils.postNotifyChange(null, null, this, "selectedItems");
}
public Converter getProxiedListitemComparator() {
if(proxiedListitemConverter == null) {
proxiedListitemConverter = new ProxiedListitemConverter();
}
return proxiedListitemConverter;
}
}Item.javajavapublic class Item {
private String label;
public String getLabel() {
return label;
}
public void setLabel(String label) {
this.label = label;
}
public Item(String label) {
this.label = label;
}
public Item() {
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((label == null) ? 0 : label.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;
Item other = (Item) obj;
if (label == null) {
if (other.label != null)
return false;
} else if (!label.equals(other.label))
return false;
return true;
}
}
ProxiedListitemConverter.javajavaimport java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import org.zkoss.bind.BindContext;
import org.zkoss.bind.Converter;
import org.zkoss.bind.proxy.FormProxyObject;
import org.zkoss.lang.Classes;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.ext.Selectable;
public class ProxiedListitemConverter implements Converter, java.io.Serializable {
private static final long serialVersionUID = 201108171811L;
@SuppressWarnings("unchecked")
public Object coerceToUi(Object val, Component comp, BindContext ctx) {
Listbox lbx = (Listbox) comp;
final ListModel<?> model = lbx.getModel();
if (model != null && !(model instanceof Selectable)) {
//model has to implement Selectable if binding to selectedItems
throw new UiException("model doesn't implement Selectable");
}
final Set<Listitem> items = new LinkedHashSet<Listitem>();
Set<Object> vals = val == null ? null : (Set<Object>) Classes.coerce(LinkedHashSet.class, val);
if (vals != null && vals.size() > 0) {
if (model != null) {
((Selectable<Object>) model).setSelection(vals);
for(int i = 0; i < model.getSize(); i++) {
Object modelEntry = model.getElementAt(i);
if(modelEntry instanceof FormProxyObject && vals.contains(((FormProxyObject)modelEntry).getOriginObject()))
((Selectable<Object>) model).addToSelection(modelEntry);
}
} else {
//no model case
for (final Iterator<?> it = lbx.getItems().iterator(); it.hasNext();) {
final Listitem li = (Listitem) it.next();
Object bean = li.getValue();
if(bean instanceof FormProxyObject) {
bean = ((FormProxyObject)bean).getOriginObject();
}
if (vals.contains(bean)) {
items.add(li);
}else {
for (Object object : vals) {
if(object instanceof FormProxyObject && ((FormProxyObject)object).getOriginObject().equals(bean)) {
items.add(li);
}
}
}
}
}
} else if (model != null && !((Selectable<Object>) model).isSelectionEmpty()) { //model !=null and no selection
((Selectable<Object>) model).clearSelection();
}
return model == null ? items : IGNORED_VALUE;
}
@SuppressWarnings("unchecked")
public Object coerceToBean(Object val, Component comp, BindContext ctx) {
Set<Object> vals = new LinkedHashSet<Object>();
if (val != null) {
final Listbox lbx = (Listbox) comp;
final ListModel<?> model = lbx.getModel();
if (model != null && !(model instanceof Selectable)) {
throw new UiException("model doesn't implement Selectable");
}
if (model != null) {
Set<?> selection = ((Selectable<?>) model).getSelection();
if (selection != null && selection.size() > 0) {
for (Object o : selection) {
vals.add(o);
}
}
} else { //no model
final Set<Listitem> items = (Set<Listitem>) Classes.coerce(HashSet.class, val);
for (Listitem item : items) {
vals.add(item.getValue());
}
}
}
return vals;
}
}
ItemsContainer.javajavaimport java.util.List;
public class ItemsContainer {
private List<Item> items;
public List<Item> getItems() {
return items;
}
public void setItems(List<Item> items) {
this.items = items;
}
public ItemsContainer(List<Item> items) {
this.items = items;
}
public ItemsContainer() {
}
}