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org.zkoss.bind.impl.BindListitemRenderer Maven / Gradle / Ivy
/* BindListitemRenderer.java
Purpose:
Description:
History:
Aug 17, 2011 3:35:42 PM, Created by henrichen
Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.impl;
import java.io.Serializable;
import org.zkoss.bind.Binder;
import org.zkoss.bind.sys.BinderCtrl;
import org.zkoss.bind.sys.TemplateResolver;
import org.zkoss.lang.Objects;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;
import org.zkoss.zk.ui.util.ForEachStatus;
import org.zkoss.zk.ui.util.Template;
import org.zkoss.zul.Attributes;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listgroup;
import org.zkoss.zul.Listgroupfoot;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.ListitemRenderer;
/**
* Listitem renderer for binding.
* @author henrichen
* @since 6.0.0
*/
public class BindListitemRenderer extends AbstractRenderer implements ListitemRenderer, Serializable {
private static final long serialVersionUID = 1463169907348730644L;
public void render(final Listitem item, final Object data, final int index) throws Exception {
final Listbox listbox = (Listbox) item.getParent();
final int size = listbox.getModel().getSize();
//B70-ZK-2555: in order to handle dynamic template name
final String subtype = item instanceof Listgroup ? "group" : item instanceof Listgroupfoot ? "groupfoot" : null;
final Template tm = resolveTemplate(listbox, item, data, index, size, "model", subtype);
if (tm == null) {
item.setLabel(Objects.toString(data));
item.setValue(data);
} else {
final ForEachStatus iterStatus = new AbstractForEachStatus() { //provide iteration status in this context
private static final long serialVersionUID = 1L;
public int getIndex() {
return index;
}
public Object getCurrent() {
return data;
}
public Integer getEnd() {
return size;
}
};
final String var = (String) tm.getParameters().get(EACH_ATTR);
final String varnm = var == null ? EACH_VAR : var; //var is not specified, default to "each"
final String itervar = (String) tm.getParameters().get(STATUS_ATTR);
final String itervarnm = itervar == null ? (var == null ? EACH_STATUS_VAR : varnm + STATUS_POST_VAR)
: itervar; //provide default value if not specified
//bug 1188, EL when nested var and itervar
Object oldVar = listbox.getAttribute(varnm);
Object oldIter = listbox.getAttribute(itervarnm);
listbox.setAttribute(varnm, data);
listbox.setAttribute(itervarnm, iterStatus);
final Component[] items = filterOutShadows(listbox, tm.create(listbox, item, null, null));
//Bug ZK-2789: do not use setAttribute when actually trying to removeAttribute
if (oldVar != null) {
listbox.setAttribute(varnm, oldVar);
} else {
listbox.removeAttribute(varnm);
}
if (oldIter != null) {
listbox.setAttribute(itervarnm, oldIter);
} else {
listbox.removeAttribute(itervarnm);
}
if (items.length != 1)
throw new UiException("The model template must have exactly one item, not " + items.length);
final Listitem nli = (Listitem) items[0];
nli.setAttribute(BinderCtrl.VAR, varnm); // for the converter to get the value
// ZK-2552
nli.setAttribute(AbstractRenderer.IS_TEMPLATE_MODEL_ENABLED_ATTR, true);
nli.setAttribute(AbstractRenderer.CURRENT_INDEX_RESOLVER_ATTR, new IndirectBinding(data) {
public Binder getBinder() {
return BinderUtil.getBinder(nli, true);
}
protected ListModel getModel() {
return listbox.getListModel();
}
public Component getComponent() {
return nli;
}
});
addItemReference(listbox, nli, index, varnm); //kept the reference to the data, before ON_BIND_INIT
nli.setAttribute(itervarnm, iterStatus);
//sync open state
if (nli instanceof Listgroup && item instanceof Listgroup) {
((Listgroup) nli).setOpen(((Listgroup) item).isOpen());
}
//ZK-1787 When the viewModel tell binder to reload a list, the other component that bind a bean in the list will reload again
//move TEMPLATE_OBJECT (was set in resoloveTemplate) to current for check in addTemplateTracking
Object obj = item.removeAttribute(TemplateResolver.TEMPLATE_OBJECT);
//Bug ZK-2789: do not use setAttribute when actually trying to removeAttribute
if (obj != null) {
nli.setAttribute(TemplateResolver.TEMPLATE_OBJECT, obj);
} else {
nli.removeAttribute(TemplateResolver.TEMPLATE_OBJECT);
}
//add template dependency
addTemplateTracking(listbox, nli, data, index, size);
if (nli.getValue() == null) //template might set it
nli.setValue(data);
item.setAttribute(Attributes.MODEL_RENDERAS, nli);
//indicate a new item is created to replace the existent one
item.detach();
}
}
}
