>>>>> "SC" == Sam Cheung <[EMAIL PROTECTED]> writes:
SC> Hi, I am interested in using Batik as a HTML CSS engine. There is
SC> an abstract CSSEngine class, which has a constructor taking
SC> ValueManager, Shorthandmanager as parameters.
SC> Could someone please tell me what is the purpose of those
SC> managers? Are those SVG specified? If I build a CSS engine for
SC> HTML CSS in general, how should I implmenet the ValueManager and
SC> ShorthandManager?
So roughly speaking a ValueManager handles converting the text of
a particular property (like 'width') to it's CSS Value (Stephane wrote
all this stuff but he's been busy lately so please excuse looseness of
CSSness here :). If you look in the batik/css/engine/value subtree
Batik already provides ValueManagers for many common CSS types (some
may need rework to handle differences between SVG & HTML - In
particular lengths).
I believe ShorthandManager is for CSS shorthand properties (like
'margin' is a shorthand for setting 'margin-top', 'margin-left', ...).
The only example currently in Batik seems to be the 'marker' property
see 'batik.css.engine.value.svg.MarkerShorthandManager'.
If you look at the examples already in Batik most of them are
fairly straight forward to implement. Some of them can be a bit
harder (like percentages for lengths). Still given the complexity of
proper CSS handling (cascade, computed values, rule matching, etc.) I
don't think this could be made any easier.
BTW you had asked how to lookup the style on an element, I think
the method you wanted was 'CSSEngine.getCascadedStyleMap', to use the
result you will also want to use CSSEngine.getPropertyIndex().
Good luck.
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