Hi Michael,
"Bishop, Michael W. CONTR J9C880" <[EMAIL PROTECTED]> wrote on
09/15/2006 01:29:18 PM:
> Is there any way to determine whether or not an SVG is visible? I?m
looking
> for a global solution. I?m trying to work with layers:
I guess I'm not sure what you mean by visibility. As you hint
below visibility doesn't mean much for a group (as any child can
set 'visibility="visible"' and be visible). Also many things like
fill='none' stroke='none', or opacity='0' are treated very similar
to visibility='hidden'.
> <g style=?display:none?> is the way I indicate a layer is not visible.
I?m
> sure there are other ways to turn it off as well.
display:none is a bit different as children can not override this.
Additionally a display:none element won't have any 'peer' in the
Graphics tree. The easiest thing is to use the CSS DOM to query
the value of the 'display' property on the element.
> However, for visible layers:
>
> <g> and <g style=?display:block?> would work and I?m sure there are
other ways.
In SVG there is display:none and display:<anything else> so you simply
need to check if the display properties value is 'none'. The first case
will have it's parent's value for display.
> Is there a way to find this out? Maybe at a lower-level? Is there a
point
> where Batik decides whether or not to draw a particular object?
Obviously a
> <g> tag isn?t typically ?drawn? anyway so this setting would apply to
its
> children which may complicate the solution.
We use 'batik.bridge.CSSUtilities.convertDisplay(Element e)' to
determine this.
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