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Graham Nelson b0c0bf87ea Further post-fragmentation tidying
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Codename Twilight</title>
<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
<meta name="viewport" content="width=device-width initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="en-gb">
<link href="../docs-assets/Contents.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Progress.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Navigation.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Fonts.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Base.css" rel="stylesheet" rev="stylesheet" type="text/css">
<script>
function togglePopup(material_id) {
var popup = document.getElementById(material_id);
popup.classList.toggle("show");
}
</script>
<link href="../docs-assets/Popups.css" rel="stylesheet" rev="stylesheet" type="text/css">
<link href="../docs-assets/Colours.css" rel="stylesheet" rev="stylesheet" type="text/css">
</head>
<body class="commentary-font">
<nav role="navigation">
<h1><a href="../index.html">
<img src="../docs-assets/Inform.png" height=72">
</a></h1>
<ul><li><a href="../compiler.html">compiler tools</a></li>
<li><a href="../other.html">other tools</a></li>
<li><a href="../extensions.html">extensions and kits</a></li>
<li><a href="../units.html">unit test tools</a></li>
</ul><h2>Other Tools</h2><ul>
<li><a href="../inblorb/index.html">inblorb</a></li>
<li><a href="index.html"><span class="selectedlink">indoc</span></a></li>
<li><a href="../inpolicy/index.html">inpolicy</a></li>
<li><a href="../inrtps/index.html">inrtps</a></li>
</ul><h2>Foundation</h2><ul>
<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
</ul>
</nav>
<main role="main">
<!--Weave of 'Codename Twilight' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../other.html">Other Tools</a></li><li><a href="index.html">indoc</a></li><li><a href="index.html#4">Chapter 4: Navigation Styles</a></li><li><b>Codename Twilight</b></li></ul></div>
<p class="purpose">The "twilight" style of navigational gadgets, a minimal version of "midnight".</p>
<ul class="toc"><li><a href="4-ct.html#SP1">&#167;1. Creation</a></li><li><a href="4-ct.html#SP2">&#167;2. Top</a></li><li><a href="4-ct.html#SP4">&#167;4. Index top</a></li><li><a href="4-ct.html#SP5">&#167;5. Middle</a></li><li><a href="4-ct.html#SP6">&#167;6. Bottom</a></li><li><a href="4-ct.html#SP7">&#167;7. Contents page</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Creation. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="function-syntax">Twilight::create</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Twilight::create</span></span>:<br/>Navigational Designs - <a href="4-nd.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ND</span><span class="plain-syntax"> = </span><a href="4-nd.html#SP1" class="function-link"><span class="function-syntax">Nav::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"twilight"</span><span class="plain-syntax">, </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">, </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ND</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">simplified_examples</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ND</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">simplified_letter_rows</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_CHAPTER_TITLE_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP2" class="function-link"><span class="function-syntax">Twilight::twilight_chapter_title</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_SECTION_TITLE_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP3" class="function-link"><span class="function-syntax">Twilight::twilight_section_title</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_INDEX_TOP_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP4" class="function-link"><span class="function-syntax">Twilight::twilight_navigation_index_top</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_NAV_MIDDLE_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP5" class="function-link"><span class="function-syntax">Twilight::twilight_navigation_middle</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_NAV_BOTTOM_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP6" class="function-link"><span class="function-syntax">Twilight::twilight_navigation_bottom</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_CONTENTS_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP7" class="function-link"><span class="function-syntax">Twilight::twilight_navigation_contents_files</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">ND</span><span class="plain-syntax">, </span><span class="constant-syntax">RENDER_CONTENTS_HEADING_MTID</span><span class="plain-syntax">, </span><a href="4-ct.html#SP7" class="function-link"><span class="function-syntax">Twilight::twilight_navigation_contents_heading</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">ND</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. Top. </b>At the front end of a section, before any of its text.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_chapter_title</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_chapter_title</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">volume</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">chapter</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"h2"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">chapter_full_title</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"h2"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_section_title</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_section_title</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">volume</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">chapter</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="reserved-syntax">section</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="../../../inweb/docs/foundation-module/5-htm.html#SP14" class="function-link"><span class="function-syntax">HTML::begin_div_with_class_S</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"bookheader"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"table"</span><span class="plain-syntax">, </span><span class="string-syntax">"width=\"100%%\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"tr"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"td"</span><span class="plain-syntax">, </span><span class="string-syntax">"width=80 valign=\"top\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">previous_section</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP12" class="function-link"><span class="function-syntax">HTMLUtilities::image_element</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Back.png"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP8" class="function-link"><span class="function-syntax">HTMLUtilities::general_link</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"standardlink"</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">previous_section</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">section_URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">img</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP12" class="function-link"><span class="function-syntax">HTMLUtilities::image_element</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"BackDisabled.png"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="string-syntax">"%S.html"</span><span class="plain-syntax">, </span><span class="identifier-syntax">indoc_settings</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">contents_leafname</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP12" class="function-link"><span class="function-syntax">HTMLUtilities::image_element</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Home.png"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP8" class="function-link"><span class="function-syntax">HTMLUtilities::general_link</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"standardlink"</span><span class="plain-syntax">, </span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="identifier-syntax">img</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_section</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP12" class="function-link"><span class="function-syntax">HTMLUtilities::image_element</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Forward.png"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP8" class="function-link"><span class="function-syntax">HTMLUtilities::general_link</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"standardlink"</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_section</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">section_URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">img</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">img</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP12" class="function-link"><span class="function-syntax">HTMLUtilities::image_element</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"ForwardDisabled.png"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"td"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"tr"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"table"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="../../../inweb/docs/foundation-module/5-htm.html#SP14" class="function-link"><span class="function-syntax">HTML::end_div</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">, </span><span class="string-syntax">"class=\"sectionheading\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="../../../inweb/docs/foundation-module/4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">section_anchor</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><a href="../../../inweb/docs/foundation-module/5-htm.html#SP17" class="function-link"><span class="function-syntax">HTML::anchor</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">section_anchor</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%c%S"</span><span class="plain-syntax">, </span><span class="constant-syntax">SECTION_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. Index top. </b>And this is a variant for index pages, such as the index of examples.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_navigation_index_top</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_navigation_index_top</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="reserved-syntax">filename</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">title</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"h2"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">title</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"h2"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. Middle. </b>At the middle part, when the text is over, but before any example cues.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_navigation_middle</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_navigation_middle</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">volume</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">section</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP11" class="function-link"><span class="function-syntax">HTMLUtilities::ruled_line</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. Bottom. </b>At the end of the section, after any example cues and perhaps also example
bodied. (In a section with no examples, this immediately follows the middle.)
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_navigation_bottom</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_navigation_bottom</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">volume</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">section</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="../../../inweb/docs/foundation-module/5-htm.html#SP14" class="function-link"><span class="function-syntax">HTML::begin_div_with_class_S</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"bookfooter"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">previous_section</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP8" class="function-link"><span class="function-syntax">HTMLUtilities::general_link</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"footerlink"</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">previous_section</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">section_URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Previous"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" / "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next_section</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP8" class="function-link"><span class="function-syntax">HTMLUtilities::general_link</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"footerlink"</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">next_section</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">section_URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Next"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" / "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="string-syntax">"%S.html"</span><span class="plain-syntax">, </span><span class="identifier-syntax">indoc_settings</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">contents_leafname</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-haj.html#SP8" class="function-link"><span class="function-syntax">HTMLUtilities::general_link</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"footerlink"</span><span class="plain-syntax">, </span><span class="identifier-syntax">url</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Contents"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">url</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="../../../inweb/docs/foundation-module/5-htm.html#SP14" class="function-link"><span class="function-syntax">HTML::end_div</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. Contents page. </b>Twilight provides a contents page of its very own: actually, several.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_navigation_contents_files</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_navigation_contents_files</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">volume</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">volume</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="4-cm.html#SP9" class="function-link"><span class="function-syntax">Midnight::write_contents_page</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="identifier-syntax">V</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Twilight::twilight_navigation_contents_heading</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">Twilight::twilight_navigation_contents_heading</span></span>:<br/><a href="4-ct.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">navigation_design</span><span class="plain-syntax"> *</span><span class="identifier-syntax">self</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="reserved-syntax">volume</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"h2"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">vol_title</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"h2"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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