Cell level recalc in MVVM grid?

answered 2013-05-20 08:49:22 +0800

benbai
2228 ● 6
http://www.zkoss.org

An easier way is calculate value in zul page via mvvm,

e.g.,

zul

<zk>
     <window apply="org.zkoss.bind.BindComposer"
        viewModel="@id('vm') @init('test.TestVM')">
        <grid model="@bind(vm.model)">
            <template name="model">
                <row>
                    <intbox value="@bind(each.cost)"/>
                    <intbox value="@bind(each.amount)"/>
                    <label value="@bind(each.cost * each.amount)"/>
                </row>
            </template>
        </grid>
    </window>
</zk>

TestVM.java

package test;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.zkoss.zul.ListModel;
import org.zkoss.zul.ListModelList;

/**
 * tested with ZK 6.5.1.1
 * 
 * @author benbai
 *
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public class TestVM {
    ListModelList _model;
    public ListModel getModel () {
        if (_model == null) {
            List l = new ArrayList();
            Random r = new Random();
            for (int i = 0; i < 10; i++) {
                l.add(new TestData(r.nextInt(10), r.nextInt(10)));
            }
            _model = new ListModelList(l);
        }
        return _model;
    }
}

TestData.java

package test;

public class TestData {
    private int _cost;
    private int _amount;
    public TestData (int cost, int amount) {
        _cost = cost;
        _amount = amount;
    }
    public void setCost (int cost) {
        _cost = cost;
    }
    public int getCost () {
        return _cost;
    }
    public void setAmount (int amount) {
        _amount = amount;
    }
    public int getAmount () {
        return _amount;
    }
    public int getTotalPrice () {
        return _cost * _amount;
    }
}

or you need to handle event and notify change manually.