Acivities and Places - passing by reference
I'm refactoring a MVP app I have that currently uses Events and an AppController to handle navigation transitions. Activities and Places appear to only pass state via tokens, not by passing by reference. is there another way? A use case may help here: Think of two screens, A Student List screen and an Add Edit Student screen. Without places using events, clicking on a Student in Student List fires off an event CONTAINING the student, so when the Add Edit Student view picks it up, it already knows about the student. With Places when you click on a student in student list, the PlaceManager gives you a place and an id for that student. The Add Edit Student Actiivity has to look up the student based off the passed in id. This seems like a major design drawback. What I was expecting was some method to pass the object. In the case where someone navigates straight to: #AddEditStudentPlace:2 I would expect my code to handle the fact that it does not have a passed in student and in THAT case, fetch it from the server. If you've already clicked on the Student in a list view, it's insane to look it up again. That's about as un GWT as you can get. Yes I could put it in a app cache, but that's a hack and introduces client side memory issues. There must be some way to handle this that keeps the model simple. The only thing I can think of is putting my events back in on top of places, but what good is that?? If I do that, why even use Places? -- 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-toolkit@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=en.
Acivities and Places - passing by reference
you need to put your student into EditStudentPlace and initialize new EditStudentActivity with it in ActivityMapper -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/FVmmXZR2-pYJ. To post to this group, send email to google-web-toolkit@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=en.
Re: Acivities and Places - passing by reference
SWEET. That was exactly it. I added a setStudent and getStudent to StudentAddEditPlace In my activity mapper I get the activity for the place, then set the student into the activity that I get from the place. Subtle but obvious now that I see it. Thank you very much. -Dave On Feb 2, 2:44 pm, John99 smy...@gmail.com wrote: you need to put your student into EditStudentPlace and initialize new EditStudentActivity with it in ActivityMapper -- 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-toolkit@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=en.
Re: Acivities and Places - passing by reference
Hi, If you want activities to be talking to each other, one way of
achieving them is via encapsulating the data in the Place, as mentioned
above.
Imagine a complex application, where in a lot of objects are required by
different activities. In events like that, you have to pass on all the
required objects through Place(s). Which is kind of chain, where sometimes,
some values have to be passed just to enable the construction of all the
possible places/activities that could be triggered from there.
A simple solution on that case could be to have a singleton value store,
and use it for value types.
@Singleton
public class ValueStore {
private MapString, Object values = new HashMapString, Object();
public Object getValue(String key) {
return values.get(key);
}
public void putValue(String key, Object value) {
values.put(key, value);
}
public boolean hasValue(String key) {
return values.containsKey(key);
}
}
Such that the data populated in one activity could be consumed by a host of
other related activities.
Just another way of achieving the same!
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