Hi Paolo,
What do you expect from the loading? Automatic application to the field
calculator (sounds scary to me), or just the ability to choose from past
expressions?
If the latter, then maybe a central expression storage (per user) would
make more sense than a per layer expression store. Because you may want
to reuse the same expression on another similar layer, even in different
projects.
To me the expressions do not have a natural 1:1 match to a layer like
the .prj or the .qml file has.
But I can see value in a central storage of expressions used in the
past, regardless of layer and QGIS project. But it would just be used as
a way to load and save expressions as templates to start from and not an
automatic application to some calculation or the label engines. These
settings should be better stored in the project itself rather than in a
separate file.
Do we agree on that or did I misunderstand you?
Andreas
On Fri, 19 Oct 2012 07:58:57 +0200, Paolo Cavallini wrote:
Il 19/10/2012 07:51, Andreas Neumann ha scritto:
For me personally, copy/paste works fine. No need for load and save.
I do not fully understand the use case for autoloading (association
with a layer). Can you explain why this is desirable? Do you really
always want the same expression in all projects for one particular
layer?
I think users will fin useful to have their expression per layer, so
they can refresh a field with the same calculation, without the need
to
rememberwhich formula they used (very stupi example: refreshing the
AREA
field). In this way, a DBF can be used almost like a spreadsheet.
For advanced users it is probably useless, for newbies it can save a
loto of time, effort and frustration remembering which expression
they
used, what is the exact syntax, where (if) they copied the expression
somewhere, etc.
All the best.
--
--
Andreas Neumann
Böschacherstrasse 10A
8624 Grüt (Gossau ZH)
Switzerland
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