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org.zkoss.bind.impl.BindTreeitemRenderer Maven / Gradle / Ivy
/* BindTreeitemRenderer.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 org.zkoss.bind.sys.TemplateResolver;
import org.zkoss.lang.Objects;
import org.zkoss.lang.Strings;
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.Tree;
import org.zkoss.zul.Treecell;
import org.zkoss.zul.Treeitem;
import org.zkoss.zul.TreeitemRenderer;
import org.zkoss.zul.Treerow;
/**
* Treeitem renderer for binding.
* @author henrichen
* @since 6.0.0
*/
public class BindTreeitemRenderer extends AbstractRenderer implements TreeitemRenderer {
private static final long serialVersionUID = 1463169907348730644L;
public void render(final Treeitem item, final Object data, final int index) throws Exception {
final Tree tree = item.getTree();
final Component parent = item.getParent();
final Template tm = resolveTemplate(tree, parent, data, index, -1, "model");
// ZK-2859: to replace the id of the the original treeitem that is not from the template
final String oldId = item.getId();
if (!Strings.isEmpty(oldId)) {
item.setId("$$FAKE_ID$$");
}
if (tm == null) {
Treecell tc = new Treecell(Objects.toString(data));
Treerow tr = null;
item.setValue(data);
if (item.getTreerow() == null) {
tr = new Treerow();
tr.setParent(item);
} else {
tr = item.getTreerow();
tr.getChildren().clear();
}
tc.setParent(tr);
} 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() {
throw new UiException("end attribute is not supported");
}
};
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 = parent.getAttribute(varnm);
Object oldIter = parent.getAttribute(itervarnm);
parent.setAttribute(varnm, data);
parent.setAttribute(itervarnm, iterStatus);
final Component[] items = filterOutShadows(parent, tm.create(parent, item, null, null));
// Bug ZK-2882
if (oldVar == null) {
parent.removeAttribute(varnm);
} else {
parent.setAttribute(varnm, oldVar);
}
if (oldIter == null) {
parent.removeAttribute(itervarnm);
} else {
parent.setAttribute(itervarnm, oldIter);
}
if (items.length != 1)
throw new UiException("The model template must have exactly one item, not " + items.length);
final Treeitem ti = (Treeitem) items[0];
ti.setAttribute(BinderImpl.VAR, varnm); // for the converter to get the value
//zk-1698, mvvm tree performance issue,
//no need to use reference binding for tree because we don't allow it to notify a path change also.
ti.setAttribute(varnm, data);
ti.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
ti.setAttribute(TemplateResolver.TEMPLATE_OBJECT, parent.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
//add template dependency
addTemplateTracking(tree, ti, data, index, -1);
if (ti.getValue() == null) //template might set it
ti.setValue(data);
// ZK-2859: change the id back if ti is actually the original treeitem which is not from the template
if ("$$FAKE_ID$$".equals(ti.getId())) {
ti.setId(oldId);
}
item.setAttribute(Attributes.MODEL_RENDERAS, ti);
//indicate a new item is created to replace the existent one
item.detach();
}
}
}
