How to use container with multiple components

Vaadin 6 / 7 / 8 Framework Data Binding
1

Hi,

Let me first describe my scenario: I have two tabs, one displaying a table of user accounts, the other one displaying a table of user groups. Both tables are filled using a BeanItemContainer - one with accounts, one with groups. The groups table displays the number of accounts in a generated column. At the account table I have a generated column too, that creates links that than clicked open a window with group assignment functionality (TwinColSelect).

I pass the account BeanItem to the window and use it as PropertyDataSource for TwinColSelect.

accountGroupSelection = new TwinColSelect();
accountGroupSelection.setCaption("Groups");
accountGroupSelection.setNullSelectionAllowed(true);
accountGroupSelection.setMultiSelect(true);
accountGroupSelection.setImmediate(false);
accountGroupSelection.setWriteThrough(false);
accountGroupSelection.setContainerDataSource(passedGroupsItemContainer);
accountGroupSelection.setItemCaptionPropertyId("name");
accountGroupSelection.setPropertyDataSource(passedAccountItem.getItemProperty("groups"));

The TwinColSelect got the same BeanItemContainer set as ContainerDataSource than the user groups table. This works fine so far.

When updating the group <> account assignment via the TwinColSelect I do:

BeanItem<UserGroup> selectedGroupItem = passedGroupsItemContainer.getItem(selectedGroup);
Property accountsProperty = selectedGroupItem.getItemProperty("accounts");
accountsProperty.setValue(selectedGroup.getAccounts());

The issue I have is that the accounts column isn’t updated after setting new property value. Maybe someone can bring me on the right path with that.

Thanks!

Michael

2

Hi Michael!

Do I understand you correctly in that the accounts table is displaying the list of accounts that are stored in the user group item’s account property? If this is the case I think you’ll have to update the accounts container manually to reflect the new state of the account property.

But it’s hard to say anything for sure without more information.

HTH,
/Jonatan

3

Hi Jonatan,

thanks for your reply. I actually got the issue resolved. Problem was the generated column - this isn’t updated automatically. Therefore I tried two things that both worked:

a) I overwrote com.vaadin.ui.Table#formatPropertyValue(java.lang.Object, java.lang.Object, com.vaadin.data.Property) to display size of groups

b) I attached a ValueChangeNotifier

Property groupsProperty = source.getContainerProperty(itemId, "groups");

// we must hook value change listener to ensure updates
if (groupsProperty instanceof Property.ValueChangeNotifier)
{
    Property.ValueChangeNotifier notifier = (Property.ValueChangeNotifier) groupsProperty;
    notifier.addListener(new Property.ValueChangeListener() 
    {
        public void valueChange(Property.ValueChangeEvent event) 
        {
            accounts.setValue((account.getGroups().size()));
        }
    });
}

Michael