#2769 listbox scroll bar position issue if ROD is true

[ashish dasnurkar]

The way to reproduce :

- create a Listbox (with ROD) with a specified height
- set a ListModel (listbox.setModel(Listmodel model)) with a large dataset (> 500 Listitems) to the Listbox
- Scroll down to the Listbox
- Set a new Listmodel (setModel) with few Listitem (5 Listitems)
- The scroll bar stay a the same position and the Listitems are not correct

Reproducible on 5.0.7.1 EE and 5.0.8-FL EE version on any browser

test.zul code
<zk xmlns:w="http://www.zkoss.org/2005/zk/client">
<window id="win" border="none" apply="test.ListboxControl">
<custom-attributes org.zkoss.zul.listbox.rod="true"/>
<listbox checkmark="true" multiple="true" id="testListbox" height="400px" width="800px">
<listhead sizable="true">
<listheader label="Test"/>
</listhead>
</listbox>

<button id="btnNewModel" label="Run Bug (make a scroll to the middle first)"/>
</window>
</zk>

test/ListboxControl.java (test.ListboxControl)

package test;

import java.util.ArrayList;
import java.util.List;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.ListModelList;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listcell;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.ListitemRenderer;

public class ListboxControl extends GenericForwardComposer {

private Listbox testListbox;

/**
*
*/
private static final long serialVersionUID = -8768290877229863939L;

@Override
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);

testListbox.setItemRenderer(new ListitemRenderer() {

@Override
public void render(Listitem arg0, Object arg1) throws Exception {
arg0.setValue(arg1);

DummyItem di = (DummyItem) arg1;

Listcell lc = new Listcell();

lc.setLabel(di.getTest());

lc.setParent(arg0);
}
});

List<DummyItem> ditems = generateDummyItems("First items", 500);

ListModelList lstModelList = new ListModelList(ditems);

testListbox.setModel(lstModelList);

}

public void onClick$btnNewModel() {
List<DummyItem> ditems = generateDummyItems("Second items", 5);

ListModelList lstModelList = new ListModelList(ditems);

testListbox.setModel(lstModelList);
}

public static List<DummyItem> generateDummyItems(String prefix, int size) {

List<DummyItem> newList = new ArrayList<DummyItem>();

for (int i = 0; i < size; i++) {
newList.add(new DummyItem(prefix + i));
}
return newList;
}

public static class DummyItem {
protected String test;

public DummyItem() {

}

public DummyItem(String test) {
setTest(test);
}

public String getTest() {
return test;
}

public void setTest(String test) {
this.test = test;
}

}

}

as mentioned on http://www.zkoss.org/forum/listComment/16780

[Jumper Chen]

This artifact has been marked as a duplicate of artifact 3352909 with reason:
No explanation provided.

[Jumper Chen]

reopen this bug, this case is not real duplicated with another.

[Jumper Chen]

Bug fixed since 2011/07/14