| Can one use Show in navigation when this requires a server query? [message #273011] |
Wed, 29 September 2004 22:52 |
 Henrich Kraemer
Messages: 59
Registered: July 2009 |
Member |
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A Music View displays songs based on information provided by a song
server. The view supports navigation to it via
IShowInTarget.show(context) based on query result IFoundSong objects.
Each IFoundSong represent a single song found by a query. (The Music
plugins also support Search dialogs which take advantage of this.)
Now a different view (created by entirely unrelated people) called
MusicReviewView features reviews of songs . The songs reviewed are
identified by textual ID information such as Artist, Title and Song.
They also want to support navigation from the songs in the Music Review
view to songs in the MusicView via the “Navigate|Show In” menu.
To do this the MusicReviewView supports the IShowInSource interface
which produces the context that is than used to determine whether the
Music View is a potential target view and should appear in the menu. The
same context object is passed into the MusicView.show(context) method
when the user selects the entry.
Executing the queries seems fine when the user selects the Show in/Music
View, but it is far too expensive in order to decide whether the
according menu should appear in the first place.
What seems missing is:
1. A means for a lightweight decision whether to show the menu. In the
example this would be based on the source views inspection of whether
there are songs referenced in its current selection. The song references
found would presumably packaged into a StructuredSelection.
2. After the navigate menu action is invoked the song references
selection is turned into a selection of ISong objects based on a query
to the song server before it is passed to MusicView.show() command.
Here are my questions:
1. Is this analysis correct?
2. Should there be an eclipse mechanism to support this?
3. Should instead views like the MusicView also support a context that
is based on a selection of query objects which it then executes during
the show call?
4. Finally should Show In be used at all, given that the query can take
some time? If not is there a suggested paradigm?
Thanks....
- Henrich
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