On Wednesday, September 12, 2012 12:53:58 AM UTC+2, Cristian Rinaldi wrote:
>
> We have an application with multiple EntryPoints. Each EntryPoint contains
> an MVP configuration with their own PlaceHistoryHandler, PlaceHistoryMapper
> and PlaceController. Depending on the order that the history handlers were
> configured, the place treatment is overlapped. I think the problem is
> raised because the implementation of PlaceHistoryHandler invokes
> PlaceController.goTo(NOWHERE) when the PlaceHistoryMapper do not find the
> place, because this place is associated with the PlaceHistoryMapper of
> another EntryPoint. How I can solve this problem? It is right to use MVP
> with multiple EntryPoints?
First, Places (and Activities) have nothing to do with MVP.
To answer your question, I'd rather say it's not quite right to load
several distinct apps in a page that tweak the URL and react to its
changes, independently of the others. The thing is, the URL -as its name
says- represents some "location" (hence the name "place" in GWT), and if
you have several independent things on a page, there's no nothing like
*one* location for the whole thing. You could use a "complex" URL
containing the "state" of each subparts (e.g.
moduleA=a&moduleB=b&moduleC=c), but that would be suboptimal in terms of
user experience (back to the UX of frames, except with a bookmarkable URL).
Let's imagine for a second that you make your apps work by "ignoring"
unknown places (that's what you were looking for right? avoiding the
goTo(NOWHERE) -or whatever is your default place actually- when
PlaceHistoryMapper doesn't understand the history token?).
1. the app loads and displays A1, B1 and C1
2. user navigates in each module:
1. A2, B1, C1 => URL is #A2
2. A2, B2, C1 => URL is #B2
3. A2, B2, C2 => URL is #C2
3. user uses his browser's back button => URL is #B2; nothing changes on
screen, because module B is already at B2, and modules A and C ignore the
place
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