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org.zkoss.bind.impl.BindSelectboxRenderer Maven / Gradle / Ivy
/* BindSelectboxRenderer.java
Purpose:
Description:
History:
Dec 15, 2011 3:47:56 PM, Created by dennischen
Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.impl;
import java.io.Serializable;
import org.zkoss.lang.Objects;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zk.ui.util.ForEachStatus;
import org.zkoss.zk.ui.util.Template;
import org.zkoss.zul.ItemRenderer;
import org.zkoss.zul.Label;
import org.zkoss.zul.Selectbox;
/**
* selectbox renderer.
* @author dennischen
* @since 6.0.0
*/
public class BindSelectboxRenderer extends AbstractRenderer implements ItemRenderer, Serializable {
private static final long serialVersionUID = 1463169907348730644L;
public String render(final Component owner, final Object data, final int index) throws Exception {
final int size = ((Selectbox) owner).getModel().getSize();
final Template tm = resolveTemplate(owner, owner, data, index, size, "model");
if (tm == null) {
return Objects.toString(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 = owner.getAttribute(varnm);
Object oldIter = owner.getAttribute(itervarnm);
owner.setAttribute(varnm, data);
owner.setAttribute(itervarnm, iterStatus);
final Component[] items = filterOutShadows(owner, tm.create(owner, null, null, null));
// Bug ZK-2882
if (oldVar == null) {
owner.removeAttribute(varnm);
} else {
owner.setAttribute(varnm, oldVar);
}
if (oldIter == null) {
owner.removeAttribute(itervarnm);
} else {
owner.setAttribute(itervarnm, oldIter);
}
if (items.length != 1)
throw new UiException("The model template must have exactly one item, not " + items.length);
if (!(items[0] instanceof Label))
throw new UiException("The model template can only support Label component, not " + items[0]);
final Label lbl = ((Label) items[0]);
lbl.setAttribute(BinderImpl.VAR, varnm);
addItemReference(owner, lbl, index, varnm); //kept the reference to the data, before ON_BIND_INIT
lbl.setAttribute(itervarnm, iterStatus);
//ZK-1787 When the viewModel tell binder to reload a list, the other component that bind a bean in the list will reload again
//selectbox doesn't support 1787 because it attaching comp is always detached after render
// //lbl.setAttribute(TemplateResolver.TEMPLATE_OBJECT, owner.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
//add template dependency
addTemplateTracking(owner, lbl, data, index, size);
//to force init and load
Events.sendEvent(new Event(BinderImpl.ON_BIND_INIT, lbl));
lbl.detach();
return lbl.getValue();
}
}
}
