Re: [xep-support] Restriction in item 2 of section 1.4 of XEP spec

From: Nikolai Grigoriev (grig@renderx.com)
Date: Sat Feb 08 2003 - 09:47:43 PST

  • Next message: Werner Donné: "Re: [xep-support] Restriction in item 2 of section 1.4 of XEP spec"

    Hi Werner,

    > At the moment I see no other way to center a block with an explicit
    > width and which is stacked in another block then to generate
    > expressions such as:
    > margin-left="50% - <width> div 2 - <padding-left>"

    As a workaround, you can use a borderless table:

    <fo:table table-layout="fixed" table-width="100%">
      <fo:table-column column-width="proportional-column-width(1)"/>
      <fo:table-column column-width="...put...your...width...here..."/>
      <fo:table-column column-width="proportional-column-width(1)"/>
      <fo:table-body>
        <fo:table-cell column-number="2">
          <fo:block>Your content here</fo:block>
        </fo:table-cell>
      </fo:table-body>
    </fo:table>

    This is 100% compliant FO.

    > Therefore, I wonder when the afore-mentioned restriction on expressions
    > will be lifted.

    Not very soon. As you probably guessed, the current state of expressions
    comprises all those that can be calculated _on the source tree_. To extend
    expressions further, one should postpone their computation until the width
    of the containing area is known. This is hard to combine with acceptable
    performance.

    Regards,
    Nikolai Grigoriev
    RenderX
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