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4cor3000172.69.35.2481hmt127Oct 29, 2021 4:28:46 AMlinkresources
index.zulzul<zk>
<div viewModel="@id('vm') @init('pkg$.ChosenboxVM')">
<chosenbox width="300px"
model="@init(vm.elModel)"
itemRenderer="${vm.itemRenderer}"
onSelect="@command('handleOnSelect')"
>
</chosenbox>
</div>
</zk>
ChosenboxVM.javajavaimport org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.Init;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zul.ItemRenderer;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
public class ChosenboxVM {
private ChosenboxHugeModel<Elem> elModel;
private ItemRenderer<Elem> itemRenderer = (owner, data, index) -> data.getName();
@Init
public void init() {
elModel = new ChosenboxHugeModel<Elem>() {
@Override
protected List<Elem> queryElements(String filter, int limit) {
return queryFromDB(filter, limit);
}
};
}
@Command
public void handleOnSelect() {
Clients.log("current selection: " + elModel.getSelection());
}
public ChosenboxHugeModel<Elem> getElModel() {
return elModel;
}
public ItemRenderer<Elem> getItemRenderer() {
return itemRenderer;
}
// the code below only simulates a DB you'd not keep all data in memory !!!
private List<Elem> queryFromDB(String filter, int limit) {
// query some data ... you'd use e.g. SQL here
return dbMockData.stream()
.filter(elem -> elem.getName().contains(filter))
.limit(limit)
.collect(Collectors.toList());
}
// just create some strings simulating the DB table
private List<Elem> dbMockData = Arrays.asList(Locale.getAvailableLocales())
.stream()
.map(Locale::getDisplayName)
.map(String::toLowerCase)
.map(Elem::new)
.collect(Collectors.toList());
}
Elem.javajavapublic class Elem {
private final String name;
public Elem(String name) {
this.name = name;
}
public String getName() {
return name;
}
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof Elem))
return false;
Elem other = (Elem) obj;
if (name == null) {
if (other.getName() != null)
return false;
} else if (!name.equals(other.getName()))
return false;
return true;
}
public String toString() {
return "Elem(" + name + ")";
}
}
ChosenboxHugeModel.javajavaimport org.zkoss.zul.AbstractListModel;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.ListModelList;
import org.zkoss.zul.ListSubModel;
import java.util.List;
public abstract class ChosenboxHugeModel<T> extends AbstractListModel<T> implements ListSubModel<T> {
@Override
public int getSize() {
return 0;
}
@Override
public T getElementAt(int i) {
return null;
}
protected abstract List<T> queryElements(String value, int max);
@Override
public ListModel<T> getSubModel(Object value, int nRows) {
return new ListModelList<T>(queryElements((String) value, Math.max(10, nRows)));
}
}