I found a cool solution, that is we have to use WidgetPresenter with
PopupPanel (say LoadingPresenter). So in my Custom AsyncCall class, i need
to fire loadingPresenter. It won't work if we use PopupPanel class inside
AsyncCall, i don't understand why? but work if we use PopupPanel Presenter
widget
public abstract class AsyncCall<T> implements AsyncCallback<T> {
/** Call the service method using cb as the callback. */
public AsyncCall()
{
Utility.eventBus.fireEvent(new ShowLoadingEvent(true));
}
public final void onFailure(Throwable caught)
{
//myp.hide();
Utility.eventBus.fireEvent(new ShowLoadingEvent(false));
onCustomFailure(caught);
}
public final void onSuccess(T result)
{
//myp.hide();
Utility.eventBus.fireEvent(new ShowLoadingEvent(false));
onCustomSuccess(result);
}
/** the failure method needed to be overwritte */
protected abstract void onCustomFailure(Throwable caught);
/** overwritte to do something with result */
protected abstract void onCustomSuccess(T result);
}
To make RPC Call, simple use this:
private AsyncCall<GetDataResult> getDataCallback=new
AsyncCall<GetDataResult>(){
@Override
public void onCustomFailure(Throwable caught) {
}
@Override
public void onCustomSuccess(GetVerbFromTripleResult result) {
//show data here (it may take long time)
}
};
and then it run really smoothly.
On Saturday, October 26, 2013 8:21:57 PM UTC+11, Tom wrote:
>
> I am using GWTP to build my webapp. Here is my problem. I have a customer
> page (CustPresenter). When that page is visited, it will call & load Data
> from Database.
>
> It may take a while to load all data, so I *want my current Browser locked
> * so that the user can not click any things while data has not finished
> downloading yet.
>
> So here is what I am thinking. I want to show a DialogBox right before I
> make the RPC call & hide it when the call finishes. Look at the below code:
>
> public class CustPresenter extends
> Presenter<CustPresenter.MyView, CustPresenter.MyProxy> {
>
> private DialogBox loadingDialogBox=new DialogBox();
>
> @Inject DispatchAsync dispatchAsync;
>
> @Override
> public void prepareFromRequest(PlaceRequest request){
> super.prepareFromRequest(request);
> loadingDialogBox.show();
> GetData getDataAction=new GetData();
> dispatchAsync.execute(getDataAction, getDataCallback);
>
> }
>
> private AsyncCallback<GetDataResult> getDataCallback=new
> AsyncCallback<GetDataResult>(){
>
> @Override
> public void onFailure(Throwable caught) {
> loadingDialogBox.hide();
> }
>
> @Override
> public void onSuccess(GetVerbFromTripleResult result) {
> //show data here (it may take long time)
> loadingDialogBox.hide();
> }
> };
> }
>
> However, when runing, the dialogbox only shows up for 1 second & then
> disappears. Right After that all the UiBinder Guis show up on the Customer
> Page & user can click any buttons on the page while the data has not
> finished downloading yet. This is not a correct behavior.
>
> I want to do something like this http://sqlfiddle.com/#!2/a2581/1. As u
> can see, when u first time open that link, a loading panel popups & u can't
> click anything until all guis show up.
>
> So, why do I have this problem?
>
> How to fix it?
>
> Or generally, What is the simplest way to show "loading indicator" during
> an RPC call in GWTP?
>
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