Acá va un poco de luz ( here's a little bit of light ).
public class AccountManager extends Composite implements
HasValueChangeHandlers<Integer> {
public AccountManager() {
......
......
......
......
initWidget(bar);
}
protected Integer getValue() {
return <some value>;
}
private void loadAccounts() {
AccountRemote.Util.getInstance().getAllAccount(new
DefaultCallback() {
@SuppressWarnings("unchecked")
public void onSuccess(Object result) {
if (result != null) {
accounts = (List<Account>)
result;
// Save the accounts
accountList.clear();
accountsHM.clear();
for (Account account :
accounts) {
accountList.addItem
(account.getAccountName());
// Save the accounts
accountsHM.put
(account.getAccountName(), account);
}
// Update the list of the
accounts in all clients
ValueChangeEvent.fire
(this,getValue());
}
}
});
public HandlerRegistration addValueChangeHandler(final
ValueChangeHandler<Integer> handler) {
return addHandler(handler,ValueChangeEvent.getType());
}
}
On 9 jun, 18:15, Iván López <[email protected]> wrote:
> Hi all!,
>
> I've a little problem upgrading my code from 1.5.3 to 1.6.4. I've
> an AccountManager class that manages the accounts and when a change is
> done it fires an event to all the components to update its list of
> accounts.
>
> AccountManager:
>
> private ChangeListenerCollection changeListeners;
>
> public void addChangeListener(ChangeListener listener) {
> if (changeListeners == null) {
> changeListeners = new ChangeListenerCollection();
> }
> changeListeners.add(listener);
> }
> public void removeChangeListener(ChangeListener listener) {
> if (changeListeners != null) {
> changeListeners.remove(listener);
> }
> }
> private void fireChangeEvent() {
> if (changeListeners != null) {
> changeListeners.fireChange(accountMainPanel);
> }
> }
>
> private void loadAccounts() {
> AccountRemote.Util.getInstance().getAllAccount(new
> DefaultCallback()
> {
>
> @SuppressWarnings("unchecked")
> public void onSuccess(Object result) {
> if (result != null) {
> accounts = (List<Account>)result;
>
> // Save the accounts
> accountList.clear();
> accountsHM.clear();
> for (Account account : accounts) {
>
> accountList.addItem(account.getAccountName());
>
> // Save the accounts
>
> accountsHM.put(account.getAccountName(), account);
> }
>
> // Update the list of the
> accounts in all clients
> fireChangeEvent();
> }
> }
> });
> }
>
> And in the clients I have this code:
> // ChangeListener to update the account list whenever an
> account
> change is done.
> ApplicationParameters.getInstance().getApplication
> ().getAccountManager().addChangeListener(new ChangeListener() {
> public void onChange(Widget sender) {
> // Update the accounts
> setFilterAccounts(ApplicationParameters.getInstance().getApplication
> ().getAccountManager().getAccounts());
> }
> });
>
> Now I'm trying to update this code to use EventHandlers but I've no
> idea what I should change. I've try with:
> public HandlerRegistration addChangeHandler(ChangeHandler handler) {
> return addDomHandler(handler, ChangeEvent.getType());
> }
>
> But I cann't control when fire the event, I mean, when I change
> something the event is fired and the clients are updated even if it is
> not necessary.
>
> Please, could someone bring me to the light :-).
>
> Thanks a lot.
>
> Regards, Iván.
>
> P.S: Excuse me for me poor english.
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