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index.zulzul<zk>
<div viewModel="@id('vm') @init('pkg$.SortingViewModel')" height="100%">
<listbox model="@init(vm.model)" mold="paging">
<listhead>
<listheader label="name" sort="auto(name)"/>
<listheader label="age" sort="auto(age)"/>
<listheader label="address" sort="auto(address)"/>
</listhead>
<template name="model">
<listitem>
<listcell label="@init(each.name)"/>
<listcell label="@init(each.age)"/>
<listcell label="@init(each.address)"/>
</listitem>
</template>
</listbox>
</div>
</zk>SortingViewModel.javajavaimport org.zkoss.bind.annotation.Init;
import org.zkoss.zul.AbstractListModel;
import org.zkoss.zul.FieldComparator;
import org.zkoss.zul.event.ListDataEvent;
import org.zkoss.zul.ext.Sortable;
import java.util.*;
public class SortingViewModel {
private SortableListModel model;
@Init
public void init() {
model = new SortableListModel();
model.setPageSize(10);
}
public SortableListModel getModel() {
return model;
}
private static class SortableListModel extends AbstractListModel implements Sortable {
public static final String NATURAL = "natural";
public static final String ASCENDING = "ascending";
public static final String DESCENDING = "descending";
private String sortField;
private String sortDir = NATURAL;
private Map<Integer, List<Person>> pagingCache = new HashMap<>();
@Override
public int getSize() {
return dbDummy.size();
}
@Override
public Object getElementAt(int index) {
final int activePage = index / getPageSize();
final int pageStart = activePage * getPageSize();
List<Person> pageElements = pagingCache.computeIfAbsent(activePage, pageToLoad -> {
System.out.println(String.format("loading page " + activePage));
//query page from DB (here I am using just the dummyDB) including sort constraint (here I do it in memory)
return queryPersons(getPageSize(), pageStart, sortField, ASCENDING.equals(sortDir));
});
//decide how many pages to keep in pagingCache, e.g. using an LRU map
return pageElements.get(index - pageStart);
}
@Override
public void sort(Comparator comparator, boolean ascending) {
//ZK's sort="auto(field)" will produce a FieldComparator see https://www.zkoss.org/javadoc/latest/zk/org/zkoss/zul/Listheader.html#setSort(java.lang.String)
FieldComparator fieldCmpr = (FieldComparator) comparator;
sortField = fieldCmpr.getRawOrderBy();
sortDir = ascending ? ASCENDING : DESCENDING;
//pages will look different after sorting
pagingCache.clear();
//tell the listbox to re-render
this.fireEvent(ListDataEvent.STRUCTURE_CHANGED, -1, -1);
}
@Override
public String getSortDirection(Comparator comparator) {
FieldComparator fieldCmpr = (FieldComparator) comparator;
return fieldCmpr.getOrderBy().equals(sortField) ? sortDir : NATURAL;
}
}
public static class Person {
private String name;
private int age;
private String address;
public Person(String name) {
this.name = name;
this.age = (int) (Math.random() * 50) + 20;
this.address = name + "'s address";
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getAddress() {
return address;
}
}
// dummy DB
private static List<Person> dbDummy = new ArrayList<>();
static {
for (int i = 0; i < 1000; i++) {
dbDummy.add(new Person("User-" + (i + 1)));
}
}
public static List<Person> queryPersons(int limit, int offset, String orderBy, boolean ascending) {
if(orderBy != null) {
dbDummy.sort(getPersonComparatorForField(orderBy, ascending));
}
return new ArrayList(dbDummy.subList(offset, offset + limit));
}
public static Comparator<Person> getPersonComparatorForField(String field, boolean ascending) {
Comparator<Person> cmp = null;
switch (field) {
case "name":
cmp = Comparator.comparing(Person::getName);
break;
case "age":
cmp = Comparator.comparing(Person::getAge);
break;
case "address":
cmp = Comparator.comparing(Person::getAddress);
break;
default:
throw new IllegalArgumentException("wrong field");
}
return ascending ? cmp : cmp.reversed();
}
}