Thanks for taking this issue on, Eliot. I tried to implement inside/outside
floats in the DocBook XSL stylesheets, and ran into similar problems trying
to get them to work in both XEP and XSL Formatter. The examples given by
the two companies use different page setups, and I wasn't able to find a
compromise page setup that could work for both processesors.
Both examples of inside/outside floats provided by the processor
documentation sets used what seemed to me to be tricks. XEP's example used
negative body-region margins with compensating start and end indents. XSL
Formatter's example used a zero-width block-container element. I understand
the necessity to resort to such tricks, because XSL-FO does not specify
inside/outside floats. I just wish the tricks would work the same way in
both processors. 8^)
Bob Stayton
Sagehill Enterprises
DocBook Consulting
bobs@sagehill.net
----- Original Message -----
From: "Eliot Kimber" <ekimber@innodata-isogen.com>
To: "xep-support" <xep-support@renderx.com>
Sent: Friday, January 28, 2005 3:59 PM
Subject: [xep-support] Inside/Outside Floats
> Here is a working sample of inside/outside floats that I've worked up. I
> think I now understand why this works. I've constructed the page
> geometry in this example so that you can have edge regions (the
> XEP-provided stuff I've seen assumes you have non-zero margins on your
> page master, which I almost never do so that I can put marks out to the
> edge of the paper if I need to. It also reduces the number of variables
> that have to be considered when doing geometry calculations.)
>
> I have found two possible issues with this sample:
>
> 1. The horizontal placement of floats differs from that produced by XSL
> Formatter in that XSL Formatter only floats to the edge of the parent
> block's effective edge based on that block's start or end indent. XEP
> floats to the edge of the nearest ancestor reference area (i.e., the
> edge of the region-body). I believe that XEP's behavior is correct based
> on my reading of the spec. I have asked Antenna House to defend their
> interpretation.
>
> 2. When I specify space-before on the child block-container of fo:float,
> XEP *always* renders the space, regardless of the conditionality
> setting. However, I believe that conditional space-before should be
> discarded in this case because side floats establish new reference
> areas. XSL Formatter does discard the conditional space in this case.
>
> The behavior in issue 2 isn't actually a problem for me--what I was
> hoping to be able to do was to have conditional space before the float
> that would be discarded if and only if the float's before edge was
> adjacent to the region-body's before edge (i.e., the float was anchored
> in the first line of the first normally-positioned block area on a
> page). However, because floats establish new reference areas, I see no
> way to get this behavior.
>
> This is a concern for me because I'm trying to emulate a hand-laid-out
> page design where marignalia were spaced out vertically along the page.
> With FO, you can get the floats to stack automatically (using
> clear="both" on the floats) but you can't get conditional space between
> the stacked floats and you can't normally know which floats will start
> on a new page.
>
> I think that what would be required would be for fo:float to be a
> specialization of block-container that explicitly had space-before/after
> properties and was clearly defined as behaving as an initial child of
> its containing reference area when it's before edge is adjacent to the
> before edge of its containing reference area.
>
> So hmph.
>
> Here is my sample FO instance:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format"
> font-family="sans-serif" font-size="9pt" line-height="120%">
> <fo:layout-master-set>
> <!-- This layout reflects the XEP approach to doing "duplex"
> marginalia (inside/outside), in which you use negative margins
> on the region body for the edge opposite the side you want the
> marginalia in (i.e., start edge for odd page with outside-edge
> marginalia).
>
> You then use start indent and end indent greater than or equal
> to the negative margins to bring the body contents back onto
> the page in the correct place.
>
> For this design we want a body column of 4in and an offset
> column of 3in, with 0.5in for the side regions (creating the
> effective page margin).
>
> Note that the negative inside-edge indent is equal to the width
> of the offset column minus the width of the edge regions (e.g.,
> -2.5in instead of -3in):
>
> inside-indent = 0 - (offset-column-width - edge-region-width)
>
> This is with no page margins (which allows for bleeds and so
> forth).
>
> -->
> <fo:simple-page-master master-name="odd-page" page-width="8.5in"
> page-height="11in"
> >
> <fo:region-body
> margin-left="-2.5in"
> margin-right="0.5in"
> margin-top="0.75in"
> margin-bottom="0.75in"
> border-color="blue"
> border-style="solid"
> border-width="0.5pt"
> />
> <fo:region-before region-name="region-before-odd"
> precedence="false" extent="0.5in"/>
> <fo:region-after extent="0.5in" precedence="false"/>
> <fo:region-start extent="0.5in"/>
> <fo:region-end extent="0.5in"/>
> </fo:simple-page-master>
> <fo:simple-page-master master-name="even-page" page-width="8.5in"
> page-height="11in"
> >
> <fo:region-body
> margin-left="0.5in"
> margin-right="-2.5in"
> margin-top="0.75in"
> margin-bottom="0.75in"
> border-color="blue"
> border-style="solid"
> border-width="0.5pt"
> />
> <fo:region-before region-name="region-before-even"
> precedence="false" extent="0.5in"/>
> <fo:region-after extent="0.5in" precedence="false"/>
> <fo:region-start extent="0.5in"/>
> <fo:region-end extent="0.5in"/>
> </fo:simple-page-master>
> <fo:page-sequence-master master-name="body-pages">
> <fo:repeatable-page-master-alternatives>
> <fo:conditional-page-master-reference
> master-reference="odd-page" odd-or-even="odd"/>
> <fo:conditional-page-master-reference
> master-reference="even-page" odd-or-even="even"/>
> </fo:repeatable-page-master-alternatives>
> </fo:page-sequence-master>
> </fo:layout-master-set>
> <fo:page-sequence master-reference="body-pages">
> <fo:static-content flow-name="region-before-odd">
> <fo:block-container display-align="after"
> block-progression-dimension="100%"
> border-after-style="solid" border-after-color="black"
> border-after-width="1pt">
> <fo:block font-size="10pt" text-align="outside">Odd
page</fo:block>
> </fo:block-container>
> </fo:static-content>
> <fo:static-content flow-name="region-before-even">
> <fo:block-container display-align="after"
> block-progression-dimension="100%"
> border-after-style="solid" border-after-color="black"
> border-after-width="1pt">
> <fo:block font-size="10pt" text-align="outside">Even
> page</fo:block>
> </fo:block-container>
> </fo:static-content>
> <fo:static-content flow-name="xsl-region-after">
> <fo:block text-align="outside" font-size="10pt"
> border-before-style="solid"
> border-before-color="black" border-before-width="1pt">
> <fo:page-number/>
> </fo:block>
> </fo:static-content>
> <fo:flow flow-name="xsl-region-body"
> start-indent="3in"
> end-indent="3in"
>
> >
> <fo:wrapper><!-- odd page -->
> <fo:block font-weight="bold" font-size="14pt">Test of floats
> into margins. Odd page</fo:block>
> <fo:block space-before="1em">This sample tests the facility in
> XEP that allows you
> to create inside/outside floats.</fo:block>
> <fo:block space-before="1em">This layout reflects the XEP
> approach to doing "duplex" marginalia (inside/outside),
> in which you use negative margins on the region body for the
> edge opposite the
> side you want the marginalia in (i.e., start edge for odd
> page with outside-edge
> marginalia).
> </fo:block>
> <fo:block space-before="1em">
> You then use start indent and end indent equal to the negative
> margins to bring the body contents back onto the page in the
> correct place.
> </fo:block>
> <fo:block space-before="1em">
> For this design we want a body column of 4in and an offset
> column of 3in, with
> 0.5in for the side regions (creating the effective page
margin).
> </fo:block>
> <fo:block space-before="1em"
> border-color="green"
> border-style="solid"
> border-width="0.5pt"
> padding="2pt"
> >
> <fo:float float="outside" clear="both"
> >
> <fo:block-container
> start-indent="0pt"
> end-indent="0pt"
> inline-progression-dimension="2in"
> block-progression-dimension="1in"
> border="red 1pt solid"
> display-align="center"
> text-align="left"
> color="red"
> >
> <fo:wrapper
> start-indent="0pt"
> end-indent="0pt"
> >
> <fo:block start-indent="1em"
> end-indent="1em">Float="outside" [1] clear="both"
> start/end indent="0pt"
> </fo:block>
> </fo:wrapper>
> </fo:block-container>
> </fo:float>
> This is a block with an outside-floated block. The outer
> block-container
> in the float sets its start and end indent to 0pt to turn off
the
> indention that would otherwise be inherited from the flow.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> </fo:block>
> <fo:block space-before="1em"
> border-color="green"
> border-style="solid"
> border-width="0.5pt"
> padding="2pt"
> >
> <fo:float float="outside" clear="both"
> >
> <fo:block-container
> space-before="0.5in"
> start-indent="0pt"
> end-indent="0pt"
> inline-progression-dimension="2in"
> block-progression-dimension="1in"
> border="red 1pt solid"
> display-align="center"
> text-align="left"
> color="red"
> >
> <fo:wrapper
> start-indent="1em" end-indent="1em" >
> <fo:block >Float="outside"</fo:block>
> <fo:block>clear="both"</fo:block>
> <fo:block>start/end indent="0pt"</fo:block>
> <fo:block>space-before="0.5in"</fo:block>
> <!-- <fo:block>space-before.conditionality =
> "0.5in"</fo:block> -->
> </fo:wrapper>
> </fo:block-container>
> </fo:float>
> A second block with a float. The outer block-container in
> this float
> specifies a space-before value but does not specify
> space-before.conditionality value of
> "retain". Thus it should never have any space before it
> (because side floats
> establish new reference areas, and therefore establish a
> fence, which causes
> the conditional space before to be discarded).
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> </fo:block>
> <fo:block space-before="1em"
> border-color="green"
> border-style="solid"
> border-width="0.5pt"
> padding="2pt"
> >
> <fo:float float="outside" clear="both"
> >
> <fo:block-container
> space-before="0.5in"
> space-before.conditionality="retain"
> start-indent="0pt"
> end-indent="0pt"
> inline-progression-dimension="2in"
> block-progression-dimension="1in"
> border="red 1pt solid"
> display-align="center"
> text-align="left"
> color="red"
> >
> <fo:wrapper
> start-indent="1em" end-indent="1em" >
> <fo:block >Float="outside"</fo:block>
> <fo:block>clear="both"</fo:block>
> <fo:block>start/end indent="0pt"</fo:block>
> <fo:block>space-before="0.5in"</fo:block>
> <fo:block>space-before.conditionality =
"retain"</fo:block>
> </fo:wrapper>
> </fo:block-container>
> </fo:float>
> A second block with a float. The outer block-container in
> this float
> specifies a space-before value and a
> space-before.conditionality value of
> "retain". Thus it should always have 1/2 inch of space before
it.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> </fo:block>
> </fo:wrapper>
> <fo:wrapper><!-- Even page -->
> <fo:block
> break-before="page"
> space-before="1em"
> border-color="green"
> border-style="solid"
> border-width="0.5pt"
> padding="2pt"
> >
> <fo:float float="outside" clear="both"
> >
> <fo:block-container
> space-before="0.5in"
> start-indent="0pt"
> end-indent="0pt"
> inline-progression-dimension="2in"
> block-progression-dimension="1in"
> border="red 1pt solid"
> display-align="center"
> text-align="left"
> color="red"
> >
> <fo:wrapper
> start-indent="1em" end-indent="1em" >
> <fo:block >Float="outside"</fo:block>
> <fo:block>clear="both"</fo:block>
> <fo:block>start/end indent="0pt"</fo:block>
> <fo:block>space-before="0.5in"</fo:block>
> </fo:wrapper>
> </fo:block-container>
> </fo:float>
> A block that starts a page and has a float anchored as its
> first child area.
> This float's inner block-container also specifies space
> before but
> no "retain", so it should have no space before it, both
> because the
> side float establishes a reference area and because it is the
> initial child area
> of the page's region-body reference area.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> +++++++++++ ++++++++++ +++++++++++ ++++ +++++++++++++ ++ ++++
> ++++++++++.
> </fo:block>
> </fo:wrapper>
> </fo:flow>
> </fo:page-sequence>
> </fo:root>
>
> --
> W. Eliot Kimber
> Professional Services
> Innodata Isogen
> 9390 Research Blvd, #410
> Austin, TX 78759
> (512) 372-8122
>
> ekimber@innodata-isogen.com
> www.innodata-isogen.com
>
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Received on Sat Jan 29 18:26:16 2005
This archive was generated by hypermail 2.1.8 : Sat Jan 29 2005 - 18:26:16 PST