Hi everyone,
I have a GWT application that uses RPC calls heavily. I would like to display a spinner icon whenever a call is in progress. It is easy enough to display the icon, but I want to do it seamlessly in one place so I don't have to explicitly hide and show the icon for each call.
I guess I am looking for something similar to jQuery's ajaxStart and ajaxStop events.
Has anyone done something like this before?
Cheers Tin
Why don't you implement this behaviour in a concrete implementation of AsyncCallback and subclass all the AsyncCallbacks from this one. Alternatively you could use a decorator pattern where you use a regular AsyncCallback and decorate it with another one that shows/hides the popup.
Alternatively, if you use a Command Pattern, you could just add these events to your command pattern implementation and you can register a handler that shows/hides a popup every time a request is send/received.