I use Operation enum inside the action that tells my presenter how to handle the action. + I create number of constructors for this event to support every operation, while the event it self has all needed properties for all operations.
;) On Nov 15, 4:19 am, "slind...@gmail.com" <slind...@gmail.com> wrote: > I am attempting to implement the EventBus pattern and I find myself > creating a LOT of Events (extending GwtEvent). I'll try to illustrate > what I mean with my Car object. I have a list of cars and a button > called "Add Car". This button has a ClickHandler attached which will > fire a AddCarEvent. > > This AddCarEvent in turn triggers the display of a dialog where the > user can enter details of the car like make, model, etc. This dialog > naturally has a button called "Save" with another ClickHandler > attached. This ClickHandler fires a new event slightly different from > AddCarEvent since we now have some details of the car, so I'm calling > this event AddNewCarEvent. The event bus has a listener that triggers > when this event is fired and makes an asynchronous call to the server > with the details of the new car. The server returns the newly created > Car object (or id of it), and a new CarAddedEvent is created (this > event in turn might trigger a LoadCarsEvent to refresh the list of > cars). > > I figured I can save myself from the AddNewCarEvent by adding > properties like "model", "make" etc to the AddCarEvent object. If they > are set I'll make the async call, if not I'll display the dialog. This > saves one Event class but I still think there must be some better way. > This is just one object, and one simple action; but it quickly gets > out of hand when adding more objects and actions (ie. a Car could have > StartCar, StartNewCar, CarStarted, StopCar, StopNewCar, CarStopped > events and so on..). > > I hope this doesn't sound too crazy, and I hope someone has some ideas > to improve and perhaps simplify this, unless this actually is a > "natural" side effect of this pattern? > > Thanks and regards, > Stian -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=.
