字符串长度后强制换行 [英] Force line break after string length

问题描述

我想在使用 AH Formatter 生成的 PDF 中的 14 个字符的字符串长度后强制换行.所以这是我的 xsl 代码，没有任何换行尝试:

I want to force a line break after a string length of 14 characters in a PDF generated with AH Formatter. So this is my xsl code without any attempt of line breaking:

<xsl:attribute-set name="big" use-attribute-sets="bold">
  <xsl:attribute name="font-size">38pt</xsl:attribute>
  <xsl:attribute name="line-height">28.84pt</xsl:attribute>
  <xsl:attribute name="text-align">center</xsl:attribute>
  <xsl:attribute name="letter-spacing">1mm</xsl:attribute>
</xsl:attribute-set>

<xsl:attribute-set name="small" use-attribute-sets="bold">
  <xsl:attribute name="font-size">27pt</xsl:attribute>
  <xsl:attribute name="line-height">27pt</xsl:attribute>
  <xsl:attribute name="text-align">center</xsl:attribute>
  <xsl:attribute name="letter-spacing">1mm</xsl:attribute>
</xsl:attribute-set>

<xsl:choose>
   <xsl:when test="string-length($count_cover)>=14">
      <fo:block xsl:use-attribute-sets="small">
         <xsl:apply-templates/>
      </fo:block>
    </xsl:when>
    <xsl:otherwise>          
      <fo:block xsl:use-attribute-sets="big">
         <xsl:apply-templates/>
      </fo:block>
   </xsl:otherwise>
</xsl:choose>

是否可以使用 XSL-FO 强制换行?

Is it possible to force a line break with XSL-FO?

推荐答案

如果标题可以转成字符串，可以插入作为换行符.>

If the title can be converted into string, you can insert <fo:block/> as line break.

<xsl:variable name="cover_title" as="xs:string" select="'Very Long Cover Title! Very Long Cover Title! Very Long Cover Title! '"/>
<xsl:variable name="count_cover" as="xs:integer" select="string-length($cover_title)"/>
<xsl:variable name="lf_position" as="xs:integer" select="14"/>

<xsl:template match="/">
    <xsl:choose>
        <xsl:when test="$count_cover gt $lf_position">
            <fo:block xsl:use-attribute-sets="small">
                <xsl:analyze-string select="$cover_title" regex=".{{1}}">
                    <xsl:matching-substring>
                        <xsl:value-of select="."/>
                        <xsl:if test="position() eq $lf_position">
                            <fo:block/>
                        </xsl:if>
                    </xsl:matching-substring>
                    <xsl:non-matching-substring/>
                </xsl:analyze-string>
            </fo:block>
        </xsl:when>
        <xsl:otherwise>
            <fo:block xsl:use-attribute-sets="big">
                <xsl:value-of select="$cover_title"/>
            </fo:block>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

结果:

<fo:block font-weight="bold" font-size="27pt" line-height="27pt" text-align="center" letter-spacing="1mm">Very Long Cove<fo:block/>r Title! Very Long Cover Title! Very Long Cover Title! </fo:block>

然而，这种方法忽略了单词边界和连字控制.如果您打算制作书籍封面标题，最好使用 fo:block-container 引入 AH Formatter 扩展.

However this method ignores word boundaries and hyphenation control. If you are intending to make book cover title, it will better to introduce AH Formatter extensions by using fo:block-container.

1. 将 fo:block-container 用于封面中固定位置和大小的标题.
2. 使用@axf:overflow-condense="font-size" 设置属性@overflow="condense".https://www.antennahouse.com/product/ahf60/docs/ahf-ext.html#axf.overflow-condense
3. 在 fo:block-container 中，放置存储标题内容的 fo:block.
4. AH Formatter 会根据内容量自动调整字体大小，因此您可以获得理想的效果.

[例子]

<fo:block-container position="absolute" top="..." left="..." width="..." height="..." overflow="condense" axf:overflow-condense="font-size" font-size="27pt" text-align="center">
    <fo:block>
       <fo:inline>Very Long Cover Title! Very Long Cover Title! Very Long Cover Title!</fo:inline>
    </fo:block>
</fo:block-container>

这篇关于字符串长度后强制换行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！