What Is "leader" Formatting Object?

This section describes 'leader' formatting object, which is an inline-level formatting object that generates an inline area with flexible width with a repeating pattern to fill gaps between other inline areas.

What Is "leader" Formatting Object? "leader" is an inline-level formatting object that generates an inline area with flexible width with a repeating pattern to fill gaps between other inline areas.

Typical usages of "leader" formatting objects are:

"leader" formatting objects support the following main attributes:

If "leader" formatting object is used in block to generate a single line, you may want to use text-align-last="justify" to fill the full length of the line. Note that text-align="justify" does not apply to the last line of a paragraph. If a paragraph has only one line, it is considered as the last line.

To help understanding how to use "leader" formatting objects, I wrote this XSL-FO example, leader-Formatting-Object.fo:

<?xml version="1.0" encoding="utf-8"?>
<!-- leader-Formatting-Object.fo
 - Copyright (c) 2016, HerongYang.com, All Rights Reserved.
-->
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
 <fo:layout-master-set>
  <fo:simple-page-master master-name="page" 
   margin="0.08in" page-height="3.3in" page-width="2.55in">
   <fo:region-body region-name="body" background-color="#eeeeee"/>
  </fo:simple-page-master>
 </fo:layout-master-set>
 <fo:page-sequence master-reference="page">
  <fo:flow flow-name="body">
   <fo:block margin="6pt" font-size="10pt" font-weight="bold"
    text-align="center">
Superman (1978)
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align="center">
Directed by Richard Donner
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" font-weight="bold"
    text-align="center">
Cast
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Marlon Brando <fo:leader leader-pattern="space"/> Jor-El
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Gene Hackman <fo:leader leader-pattern="dots"/> Lex Luthor
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Christopher Reeve <fo:leader leader-pattern="rule"/> Superman
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Christopher Reeve <fo:leader leader-pattern="rule" 
leader-length="20%"/> Superman
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Christopher Reeve <fo:leader leader-pattern="rule" 
leader-length.maximum="10%"/> Superman
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Christopher Reeve <fo:leader leader-pattern="rule" 
leader-length.maximum="0.2in"/> Superman
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Christopher Reeve <fo:leader leader-pattern="rule" 
leader-length="0.2in"/> Superman
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Ned Beatty <fo:leader leader-pattern="rule" rule-style="double"/> Otis
   </fo:block>
   <fo:block margin="6pt" font-size="8pt" text-align-last="justify">
Jackie Cooper <fo:leader leader-pattern="use-content">~</fo:leader> 
Perry White
   </fo:block>
   </fo:flow>
 </fo:page-sequence>
</fo:root>

If you process this example XSL-FO document with Apache FOP tool and view the output, you will see that the cast list of the Superman movie generated with different styles of "leader" formatting objects:

"leader" Formatting Objects

Last update: 2016.

Table of Contents

 About This XSL-FO Tutorial Book

 Introduction of XSL-FO

 Apache™ FOP (Formatting Objects Processor)

 RenderX XEP as an XSL-FO Tool

 Introduction of Area Model

 XSL-FO Document Basics and Examples

 Page Layout Masters

 Block-Level Formatting Objects

Inline-Level Formatting Objects

 What Are Inline-Level Formatting Objects?

 What Is "inline" Formatting Object?

 "inline" Splitting for Line Break

 What Is "line-height" Attribute?

 What Is "baseline-shift" Attribute?

 "inline" with Mixed Content

 FOP Failed on "block" inside "inline"

 What Is "inline-container" Formatting Object?

 What Is "charecter" Formatting Object?

What Is "leader" Formatting Object?

 What Are "page-number*" Formatting Objects?

 Including Graphics in XSL-FO document

 Table of Rows and Columns

 List, Item, Label, and Body

 Floating Blocks - "float" and "footnote"

 Hyperlinks, Table of Contents and Indexes

 Headers and Footers using "static-content"

 Font Attributes and Font Families

 Apache FOP Font Configurations

 RenderX XEP Font Configurations

 References

 PDF Printing Version