The "twilight" style of navigational gadgets, a minimal version of "midnight".

• §1. Creation
• §2. Top
• §4. Index top
• §5. Middle
• §6. Bottom
• §7. Contents page

§1. Creation.

navigation_design *Twilight::create?Usage of Twilight::create:
Navigational Designs - §1(void) {
    navigation_design *ND = Nav::new(I"twilight", FALSE, FALSE);
    ND->simplified_examples = TRUE;
    ND->simplified_letter_rows = TRUE;
    METHOD_ADD(ND, RENDER_CHAPTER_TITLE_MTID, Twilight::twilight_chapter_title);
    METHOD_ADD(ND, RENDER_SECTION_TITLE_MTID, Twilight::twilight_section_title);
    METHOD_ADD(ND, RENDER_INDEX_TOP_MTID, Twilight::twilight_navigation_index_top);
    METHOD_ADD(ND, RENDER_NAV_MIDDLE_MTID, Twilight::twilight_navigation_middle);
    METHOD_ADD(ND, RENDER_NAV_BOTTOM_MTID, Twilight::twilight_navigation_bottom);
    METHOD_ADD(ND, RENDER_CONTENTS_MTID, Twilight::twilight_navigation_contents_files);
    METHOD_ADD(ND, RENDER_CONTENTS_HEADING_MTID, Twilight::twilight_navigation_contents_heading);
    return ND;
}

§2. Top. At the front end of a section, before any of its text.

void Twilight::twilight_chapter_title?Usage of Twilight::twilight_chapter_title:
§1(navigation_design *self, text_stream *OUT, volume *V, chapter *C) {
    HTML_OPEN("h2");
    WRITE("%S", C->chapter_full_title);
    HTML_CLOSE("h2");
}

§3.

void Twilight::twilight_section_title?Usage of Twilight::twilight_section_title:
§1(navigation_design *self, text_stream *OUT, volume *V, chapter *C, section *S) {
    HTML::begin_div_with_class_S(OUT, I"bookheader", __FILE__, __LINE__);
    HTML_OPEN_WITH("table", "width=\"100%%\"");
    HTML_OPEN("tr");
    HTML_OPEN_WITH("td", "width=80 valign=\"top\"");
    if (S->previous_section) {
        TEMPORARY_TEXT(img)
        HTMLUtilities::image_element(img, I"Back.png");
        HTMLUtilities::general_link(OUT, I"standardlink", S->previous_section->section_URL, img);
        DISCARD_TEXT(img)
    } else {
        HTMLUtilities::image_element(OUT, I"BackDisabled.png");
    }
    TEMPORARY_TEXT(url)
    TEMPORARY_TEXT(img)
    WRITE_TO(url, "%S.html", indoc_settings->contents_leafname);
    HTMLUtilities::image_element(img, I"Home.png");
    HTMLUtilities::general_link(OUT, I"standardlink", url, img);
    DISCARD_TEXT(img)
    DISCARD_TEXT(url)
    if (S->next_section) {
        TEMPORARY_TEXT(img)
        HTMLUtilities::image_element(img, I"Forward.png");
        HTMLUtilities::general_link(OUT, I"standardlink", S->next_section->section_URL, img);
        DISCARD_TEXT(img)
    } else {
        HTMLUtilities::image_element(OUT, I"ForwardDisabled.png");
    }
    HTML_CLOSE("td");
    HTML_CLOSE("tr");
    HTML_CLOSE("table");
    HTML::end_div(OUT);

    HTML_OPEN_WITH("p", "class=\"sectionheading\"");
    if (Str::len(S->section_anchor) > 0) HTML::anchor(OUT, S->section_anchor);
    WRITE("%c%S", SECTION_SYMBOL, S->title);
    HTML_CLOSE("p");
}

§4. Index top. And this is a variant for index pages, such as the index of examples.

void Twilight::twilight_navigation_index_top?Usage of Twilight::twilight_navigation_index_top:
§1(navigation_design *self, text_stream *OUT, text_stream *filename, text_stream *title) {
    HTML_OPEN("h2");
    WRITE("%S", title);
    HTML_CLOSE("h2");
}

§5. Middle. At the middle part, when the text is over, but before any example cues.

void Twilight::twilight_navigation_middle?Usage of Twilight::twilight_navigation_middle:
§1(navigation_design *self, text_stream *OUT, volume *V, section *S) {
    HTMLUtilities::ruled_line(OUT);
}

§6. Bottom. 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.)

void Twilight::twilight_navigation_bottom?Usage of Twilight::twilight_navigation_bottom:
§1(navigation_design *self, text_stream *OUT, volume *V, section *S) {
    HTML::begin_div_with_class_S(OUT, I"bookfooter", __FILE__, __LINE__);
    HTML_OPEN("p");
    if (S->previous_section) {
        HTMLUtilities::general_link(OUT, I"footerlink", S->previous_section->section_URL, I"Previous");
        WRITE(" / ");
    }
    if (S->next_section) {
        HTMLUtilities::general_link(OUT, I"footerlink", S->next_section->section_URL, I"Next");
        WRITE(" / ");
    }
    TEMPORARY_TEXT(url)
    WRITE_TO(url, "%S.html", indoc_settings->contents_leafname);
    HTMLUtilities::general_link(OUT, I"footerlink", url, I"Contents");
    DISCARD_TEXT(url)
    HTML_CLOSE("p");
    HTML::end_div(OUT);
}

§7. Contents page. Twilight provides a contents page of its very own: actually, several.

void Twilight::twilight_navigation_contents_files?Usage of Twilight::twilight_navigation_contents_files:
§1(navigation_design *self) {
    volume *V;
    LOOP_OVER(V, volume)
        Midnight::write_contents_page(self, V);
}

void Twilight::twilight_navigation_contents_heading?Usage of Twilight::twilight_navigation_contents_heading:
§1(navigation_design *self, text_stream *OUT, volume *V) {
    HTML_OPEN("h2");
    WRITE("%S", V->vol_title);
    HTML_CLOSE("h2");
}