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index.zulzul<?component name="customListbox" class="pkg$.CustomListbox"?>
<zk>
<window border="normal" title="hello" apply="pkg$.TestComposer">
<textbox id="inp" />
<customListbox id="listi">
<listitem height="28px">
<listcell label="ZK Jet 0.8.0 is released" />
<listcell label="2008/11/17 17:41:29" />
</listitem>
<listitem height="28px">
<listcell label="URLs for iPhone-Optimized Google Sites" />
<listcell label="2008/11/17 15:56:37" />
</listitem>
</customListbox>
</window>
</zk>
TestComposer.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 org.zkoss.zk.ui.select.annotation.Wire;
import java.util.List;
import java.util.ArrayList;
import java.lang.InterruptedException;
import java.lang.Thread;
public class TestComposer extends GenericForwardComposer{
private @Wire Listbox listi;
public void doAfterCompose(Component comp) throws Exception {
List<String> modelElements = new ArrayList<>();
super.doAfterCompose(comp);
this.listi.getChildren().forEach(child -> {
child.getChildren().forEach(ce -> {
if(ce instanceof Listcell) {
Listcell cell = (Listcell) ce;
modelElements.add(cell.getLabel());
}
});
});
ListModel<String> model = new ListModelList(modelElements);
listi.setModel(model);
}
public void onBlur$inp(Event e){
this.refresh();
}
public void onSelect$listi(Event e){
int index = this.listi.getSelectedIndex();
this.log("selected index: " + index);
}
public void log(String msg) {
Clients.log(msg);
}
public void refresh() {
this.listi.setModel(getModel(this.listi));
}
private ListModelList getModel(Listbox box) {
ListModel<String> lm = box.getModel();
return ((ListModelList) lm);
}
}
CustomListbox.javajavaimport java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import 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 org.zkoss.zul.event.*;
public class CustomListbox extends Listbox{
private Map<String, Integer> previousUUIDMap = new HashMap<>();
private String previousSelectedUUID = null;
@Override
public void setModel(ListModel<?> model) {
if(model != null){
// our listener must go first
model.addListDataListener(new ListDataListener() {
@SuppressWarnings("boxing")
@Override
public void onChange(ListDataEvent event) {
if (event.getType() == ListDataEvent.CONTENTS_CHANGED) {
Clients.log("Contents Changed fired");
List<Listitem> items = getItems();
previousUUIDMap.clear();
for(Listitem item : items) {
previousUUIDMap.put(item.getUuid(), item.getIndex());
}
}
}
});
}
List<Listitem> items = getItems();
previousUUIDMap.clear();
for(Listitem item : items) {
previousUUIDMap.put(item.getUuid(), item.getIndex());
}
super.setModel(model);
}
@Override
public void service(AuRequest request, boolean everError) {
if (Events.ON_SELECT.equals(request.getCommand())) {
if (request.getData().containsKey("items")) {
List<String> items = (List<String>) request.getData().get("items");
if (items.size() == 1) {
this.previousSelectedUUID = items.get(0);
Clients.log("previous UUID: " + this.previousSelectedUUID);
} else {
// multiselect
this.previousSelectedUUID = null;
}
}
}
super.service(request, everError);
}
@Override
public void service(Event event, Scope scope) throws Exception {
if (event instanceof SelectEvent<?, ?>) {
SelectEvent<?, ?> selectEvent = (SelectEvent<?, ?>) event;
// no item selected, may be Event bug
if (selectEvent.getSelectedItems().isEmpty()) {
List<Listitem> items = getItems();
if (this.previousSelectedUUID != null && this.previousUUIDMap.containsKey(this.previousSelectedUUID)) {
int index = this.previousUUIDMap.get(this.previousSelectedUUID).intValue();
if (items.size() > index) {
ListModelList<Object> model = (ListModelList<Object>) getModel();
ArrayList<Object> selection = new ArrayList<>();
selection.add(model.getElementAt(index));
model.setSelection(selection);
Clients.log("restored index: " + index);
}
}
}
}
super.service(event, scope);
}
}