Align fo:float top-flush with wrapping text's ascender line
Is there a technique/method to align a side-float top flush with the ascender line of the text flowing around it?
Here's my example code:
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
<fo:simple-page-master master-name="pages">
<fo:region-body margin-left="1in" margin-right="1in" margin-top="1in" margin-bottom="1in" />
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body">
<fo:wrapper line-stacking-strategy="font-height" line-height.conditionality="discard" line-height="1.8" font-size="24pt">
<fo:block space-after="2lh">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-1</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block space-after="2lh">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-2</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:wrapper>
</fo:flow>
</fo:page-sequence>
</fo:root>
I think I understand why this is: For FLOAT-1, the line-height.conditionality="discard" of the wrapping fo:block kicks in at the top of the reference area and removes the upper half-leading portion. This is intended, so that any element in my document starts at the same perceived vertical position, be it a table, image or paragraph. However, when we're not at the top edge of a reference area, the upper portion of the half-leading is not discarded, and the fo:float aligns with the before edge of the line box (not the before edge of the nominal-requested-line-rectangle).
Is there a programmatic, universal technique to have floats anchored at the start of a paragraph align with the paragraph font's ascender line, not its first line box?
I'd like to have FLOAT-2 be aligned the same way visually as FLOAT-1, in any potential location throughout the document. Generally wrapping each and every paragraph also in an outer fo:block-container is likely not an option in my case, as that would have spacing/layout side-effects in many other places, I fear…
I am trying with Antennahouse FO Formatter 7.2.
Solution
- If the floats are graphics, you can use the
axf:initial-lettersextension (see https://www.antenna.co.jp/AHF/help/en/ahf-ext.html#axf.initial-letters) to position and size the graphics. - You can specify
space-beforeon thefo:block-containerin the float. - I'm not sure why the
line-height.conditionality="discard"isn't always applied, but you can get it back with anfo:initial-property-set. - You can set
axf:baseline-grid="new"on eachfo:block. - You can put an
fo:block-containeraround eachfo:block(although you've already discounted that option)
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format"
xmlns:axf="http://www.antennahouse.com/names/XSL/Extensions"
line-height="1.8" font-size="24pt"
line-stacking-strategy="font-height">
<fo:layout-master-set>
<fo:simple-page-master master-name="pages">
<fo:region-body margin-left="1in" margin-right="1in" margin-top="1in" margin-bottom="1in" />
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body" axf:baseline-grid="new">
<fo:block space-after="2lh" axf:initial-letters="2">
<fo:external-graphic src="logo-antenna-200x200.png"/>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block space-after="2lh" axf:initial-letters="2">
<fo:external-graphic src="logo-antenna-200x200.png"/>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:flow>
</fo:page-sequence>
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body" line-height.conditionality="discard">
<fo:block space-after="2lh">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-1</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block space-after="2lh">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black" space-before="(1lh - 1em) div 2" space-before.conditionality="retain">
<fo:block>FLOAT-2</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:flow>
</fo:page-sequence>
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body" line-height.conditionality="discard">
<fo:block space-after="2lh"><fo:initial-property-set line-height.conditionality="discard" />
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-1</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block space-after="2lh"><fo:initial-property-set line-height.conditionality="discard" />
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-2</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:flow>
</fo:page-sequence>
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body">
<fo:block space-after="2lh" axf:baseline-grid="new">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-1</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block space-after="2lh" axf:baseline-grid="new">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-2</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:flow>
</fo:page-sequence>
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body" line-height.conditionality="discard">
<fo:block space-after="2lh">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-1</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block-container space-after="2lh">
<fo:block>
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-2</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:block-container>
</fo:flow>
</fo:page-sequence>
</fo:root>
Another alternative that uses text-altitude:
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body">
<fo:block space-after="2lh" text-altitude="0">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block line-height.conditionality="discard">FLOAT-1</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block space-after="2lh" text-altitude="0">
<fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block line-height.conditionality="discard">FLOAT-2</fo:block>
</fo:block-container>
</fo:float>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:flow>
</fo:page-sequence>
<fo:inline line-height.conditionality="discard"> around the fo:float:
<fo:page-sequence master-reference="pages">
<fo:flow flow-name="xsl-region-body">
<fo:block line-height.conditionality="discard" space-after="2lh">
<fo:inline line-height.conditionality="discard"><fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-1</fo:block>
</fo:block-container>
</fo:float></fo:inline>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
<fo:block line-height.conditionality="discard" space-after="2lh">
<fo:inline line-height.conditionality="discard"><fo:float float="start">
<fo:block-container inline-progression-dimension="20%" background-color="yellow" border="1px solid black">
<fo:block>FLOAT-2</fo:block>
</fo:block-container>
</fo:float></fo:inline>Torem dolor amet adipisicing sed eiusmod incididunt labore dolore aliqua enim minim quis exercitation laboris ut ex commodo Duis irure in in velit cillum eu nulla Excepteur occaecat non sunt.</fo:block>
</fo:flow>
</fo:page-sequence>
The fo:inline is aligned with the dominant alphabetic baseline, and the fo:float is aligned with the top of the fo:inline. It's not clear to me why line-height.conditionality="discard" should work on the fo:inline, but it does.
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