Steve Bennett wrote:
On Fri, Feb 4, 2011 at 5:46 AM, Sebastian Klein <[email protected]> wrote:
Its a draft, so if you have suggestions / criticism, we should discuss it.
Let me suggest to change the symbol from double colon to something
unoccupied, e.g. a slash:
way[access=private]::access ---> way[access=private]/access
The CSS spec has ::first_letter and ::before as examples for so called
pseudo elements [1]. The first makes the rule apply only to the first letter
and the latter inserts text like paragraph numbering into the document [2]
I just noticed this thread. First, can I check my understanding of the
goal here. MapCSS currently allows multiple things to be rendered for
a single rule, but only if they have distinct z-indexes. Any
information from a single rule for a given z-index is merged. So what
this aims to do is remove that limitation: multiple, independent
renderings of a single rule, possibly on the same z-index.
The z-index looks like an innocent property, but in fact it does a lot
behind the scenes. The idea is to demote z-index to an ordinary property
(that can be overridden by subsequent rules) and make the rendering of
new parts more explicit.
My basic use case is the following (JOSM):
You have a list of styles that the user has activated [1]. Usually there
is one base style and then a couple of styles provided by other users [2]:
* parking lanes
* max speed
* highlight of modified objects
* more POI symbols (e.g. for sea maps)
...
Now as a style sheet author, you usually like to put your stuff on a
different layer. How do you know, that a certain z-index is still available?
At the same time, it should be possible to _modify_ the rules from the
base style. (That's what the "cascading" css is all about, right.) E.g.
in the last example (more POI symbols) it doesn't make sense to have 2
symbols of different size, overlapping each other. You either replace
the symbol or keep the old.
This is my "requirement" and I'm open for ideas, that solve it in a
elegant and easy-to-use way.
Sebastian
[1] https://josm.openstreetmap.de/wiki/Help/Dialog/MapStyleDialog
[2] https://josm.openstreetmap.de/wiki/Styles
my proposal:
<http://wiki.openstreetmap.org/wiki/Talk:MapCSS/0.2#Dealing_with_z-index_and_cascades_more_sensibly>
PS: it was a dumb idea to replace "::" by "/". Then ::* would become /*
and this would start a comment. :)
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