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org.zkoss.bind.impl.BindRowRenderer Maven / Gradle / Ivy
/* BindRowRenderer.java
Purpose:
Description:
History:
Aug 16, 2011 10:34:50 AM, 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.util.ForEachStatus;
import org.zkoss.zk.ui.util.Template;
import org.zkoss.zul.Attributes;
import org.zkoss.zul.Grid;
import org.zkoss.zul.Group;
import org.zkoss.zul.Groupfoot;
import org.zkoss.zul.Label;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.Row;
import org.zkoss.zul.RowRenderer;
import org.zkoss.zul.Rows;
/**
* Row renderer for binding.
* @author henrichen
* @since 6.0.0
*/
public class BindRowRenderer extends AbstractRenderer implements RowRenderer {
private static final long serialVersionUID = 1463169907348730644L;
public void render(final Row row, final Object data, final int index) {
final Rows rows = (Rows)row.getParent();
final Grid grid = (Grid)rows.getParent();
final int size = grid.getModel().getSize();
//B70-ZK-2555: in order to handle dynamic template name
final String subtype = row instanceof Group ? "group" : row instanceof Groupfoot ? "groupfoot" : null;
final Template tm = resolveTemplate(grid, row, data, index, size, "model", subtype);
if (tm == null) {
final Label label = newRenderLabel(Objects.toString(data));
label.applyProperties();
label.setParent(row);
row.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 = grid.getAttribute(varnm);
Object oldIter = grid.getAttribute(itervarnm);
grid.setAttribute(varnm, data);
grid.setAttribute(itervarnm, iterStatus);
final Component[] items = filterOutShadows(rows, tm.create(rows, row, null, null));
// Bug ZK-2882
if (oldVar == null) {
grid.removeAttribute(varnm);
} else {
grid.setAttribute(varnm, oldVar);
}
if (oldIter == null) {
grid.removeAttribute(itervarnm);
} else {
grid.setAttribute(itervarnm, oldIter);
}
if (items.length != 1)
throw new UiException("The model template must have exactly one row, not "+items.length);
final Row nr = (Row)items[0];
nr.setAttribute(BinderCtrl.VAR, varnm);
// ZK-2552
recordRenderedIndex(grid, items.length);
nr.setAttribute(AbstractRenderer.IS_TEMPLATE_MODEL_ENABLED_ATTR, true);
nr.setAttribute(AbstractRenderer.CURRENT_INDEX_RESOLVER_ATTR, new IndirectBinding(data) {
public Binder getBinder() {
return BinderUtil.getBinder(nr, true);
}
protected ListModel getModel() {
return grid.getListModel();
}
public Component getComponent() {
return nr;
}
});
addItemReference(grid, nr, index, varnm); //kept the reference to the data, before ON_BIND_INIT
nr.setAttribute(itervarnm, iterStatus);
//sync open state
if (nr instanceof Group && row instanceof Group) {
((Group)nr).setOpen(((Group)row).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
nr.setAttribute(TemplateResolver.TEMPLATE_OBJECT, row.removeAttribute(TemplateResolver.TEMPLATE_OBJECT));
//add template dependency
addTemplateTracking(grid, nr, data, index, size);
if (nr.getValue() == null) //template might set it
nr.setValue(data);
row.setAttribute(Attributes.MODEL_RENDERAS, nr);
//indicate a new row is created to replace the existent one
row.detach();
}
}
/** Returns the label for the cell generated by the default renderer.
*/
private static Label newRenderLabel(String value) {
final Label label =
new Label(value != null && value.length() > 0 ? value: " ");
label.setPre(true); //to make sure is generated, and then occupies some space
return label;
}
}
