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index.zulzul<zk>
<window border="normal" title="hello" apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init('pkg$.TestViewModel')">
<button label="Refresh" onClick="@command('refresh')"/>
<grid mold="paging" model="@bind(vm.items)" pageSize="@load(vm.pageSize)">
<custom-attributes org.zkoss.zul.grid.rod="true"/>
<columns>
<column label="ID"/>
<column label="Name"/>
</columns>
<rows>
<template name="model">
<row>
<label value="@load(each.id)"/>
<label value="@load(each.name)"/>
</row>
</template>
</rows>
</grid>
getSize() invoke counter: <label value="@bind(vm.sizeCounter)"/>
</window>
</zk>TestViewModel.javajavaimport org.zkoss.bind.annotation.*;
import org.zkoss.zhtml.Filedownload;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.select.Selectors;
import org.zkoss.zk.ui.select.annotation.Wire;
import org.zkoss.zul.AbstractListModel;
import org.zkoss.zul.Combobox;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.ListModelList;
public class TestViewModel {
private ListModel<TestItem> items;
private int pageSize = 10;
@AfterCompose
public void afterCompose(@ContextParam(ContextType.VIEW) final Component view) {
Selectors.wireComponents(view, this, false);
refresh();
}
@Command
@NotifyChange({"items", "sizeCounter"})
public void refresh() {
items = new TestListModel(pageSize);
}
public ListModel<TestItem> getItems() {
return items;
}
public int getPageSize() {
return pageSize;
}
public long getSizeCounter() {
if(items != null)
return ((TestListModel) items).getSizeCounter();
else
return 0;
}
}
TestListModel.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
import java.io.*;
import java.util.*;
public class TestListModel extends AbstractListModel<TestItem> {
private List<TestItem> testItems;
private int pageSize;
private final Map<Integer, TestItem> cache;
private int size = -1;
private long sizeCounter;
public TestListModel(final int pageSize) {
super();
generateItems(1000);
this.pageSize = pageSize;
this.cache = new HashMap<Integer, TestItem>();
}
@Override
public TestItem getElementAt(final int index) {
TestItem testItem = cache.get(index);
if (testItem == null) {
try {
final List<TestItem> testItems = getTestItems(index, pageSize);
int indexKey = index;
for (final TestItem o : testItems) {
cache.put(indexKey, o);
indexKey++;
}
} catch (final Exception e) {
} finally {
}
} else {
return testItem;
}
testItem = cache.get(index);
if (testItem == null) {
throw new RuntimeException("Element at index " + index + " cannot be found in the database.");
} else {
return testItem;
}
}
@Override
public int getSize() {
sizeCounter++;
if (size < 0) {
try {
size = (int) getFullItemsSize();
} catch (final Exception e) {
} finally {
}
}
return size;
}
private void generateItems(int size) {
testItems = new ArrayList(size);
Random rnd = new Random();
for(int i = 0; i < size; i++) {
testItems.add(new TestItem(i, java.util.UUID.randomUUID().toString()));
}
}
private List<TestItem> getTestItems(int index, int pageSize) {
List<TestItem> chunk = new ArrayList<TestItem>();
int end;
if((index + pageSize) > getFullItemsSize())
end = getFullItemsSize();
else
end = index + pageSize;
chunk = testItems.subList(index, end);
return chunk;
}
private int getFullItemsSize() {
return testItems.size();
}
public long getSizeCounter() {
return sizeCounter;
}
}TestItem.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
public class TestItem {
private int id;
private String name;
public TestItem(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
}