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org.zkoss.bind.impl.BindComboitemRenderer Maven / Gradle / Ivy
/* BindComboitemRenderer.java
Purpose:
Description:
History:
Aug 17, 2011 3:47:56 PM, Created by henrichen
Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.impl;
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.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.Attributes;
import org.zkoss.zul.Combobox;
import org.zkoss.zul.Comboitem;
import org.zkoss.zul.ComboitemRenderer;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.ListSubModel;
/**
* comboitem renderer for binding.
* @author henrichen
* @since 6.0.0
*/
public class BindComboitemRenderer extends AbstractRenderer implements ComboitemRenderer {
private static final long serialVersionUID = 1463169907348730644L;
public void render(final Comboitem item, final Object data, final int index) throws Exception {
final Combobox cb = (Combobox) item.getParent();
final ListModel model = cb.getModel();
final int size = model.getSize();
final Template tm = resolveTemplate(cb, item, data, index, size, "model");
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 = cb.getAttribute(varnm);
Object oldIter = cb.getAttribute(itervarnm);
cb.setAttribute(varnm, data);
cb.setAttribute(itervarnm, iterStatus);
final Component[] items = filterOutShadows(cb, tm.create(cb, item, null, null));
// Bug ZK-2882
if (oldVar == null) {
cb.removeAttribute(varnm);
} else {
cb.setAttribute(varnm, oldVar);
}
if (oldIter == null) {
cb.removeAttribute(itervarnm);
} else {
cb.setAttribute(itervarnm, oldIter);
}
if (items.length != 1)
throw new UiException("The model template must have exactly one item, not " + items.length);
final Comboitem nci = (Comboitem) items[0];
nci.setAttribute(BinderCtrl.VAR, varnm); // for the converter to get the value
if (model instanceof ListSubModel) {
//ZK-992 wrong item when binding to combbox with submodel implementation
//combobox has a internal model as the submodel,
//I don't have way to access the submodel, and user doesn't has info to notify model[index] changed.
//so I set the value directly.
nci.setAttribute(varnm, data);
} else {
// ZK-2552
nci.setAttribute(AbstractRenderer.IS_TEMPLATE_MODEL_ENABLED_ATTR, true);
nci.setAttribute(AbstractRenderer.CURRENT_INDEX_RESOLVER_ATTR, new IndirectBinding(data) {
public Binder getBinder() {
return BinderUtil.getBinder(nci, true);
}
protected ListModel getModel() {
return cb.getModel();
}
public Component getComponent() {
return nci;
}
});
addItemReference(cb, nci, index, varnm); //kept the reference to the data, before ON_BIND_INIT
}
nci.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
//move TEMPLATE_OBJECT (was set in resoloveTemplate) to current for check in addTemplateTracking
nci.setAttribute(TemplateResolver.TEMPLATE_OBJECT, item.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
//add template dependency
addTemplateTracking(cb, nci, data, index, size);
if (nci.getValue() == null) //template might set it
nci.setValue(data);
item.setAttribute(Attributes.MODEL_RENDERAS, nci);
//indicate a new item is created to replace the existent one
item.detach();
//bug #ZK-677: combobox selection is lost after reload model
//binding Comboitem immediately, @see BindUiLifeCycle#afterComponentAttached
Events.sendEvent(new Event(BinderCtrl.ON_BIND_INIT, nci));
}
}
}
