FlexiBook

Adaptive layout books for 1.20.1-26.2 neoforge&fabric

more versions coming soon

Custom DataComponent + client layout engine + AdaptiveBookScreen, keeping a book-like interaction while supporting:

You can use web book editor without coding. It is in sourcecode repo on Github Description almost copied from Github README.md

• HTML-subset markup ([h1] / [p] / [b] / [color] / [img] / [link] …)
• Resolve translation keys and reflow pagination when the book opens (current client language)
• Auto scale-down for long content; optional two-column layout
• Safe links: registered command ids only, or confirmed http(s) URLs
• In-book search highlight
• Built-in default font flexibook:default (unihex Unifont; omitting font does not fall back to minecraft:default)
• AdaptiveBookBuilder / FlexiBookAPI for other mods
• Data-driven themes (assets/<ns>/flexibook/themes/<id>.json)

Requirements

• JDK 21 for Gradle (JDK 25/26 breaks on Gradle/Groovy bytecode)
• Minecraft 1.21.1
• NeoForge 21.1.x (see neo_version in gradle.properties)

Build

# If default java is not 21:
export JAVA_HOME=/usr/lib/jvm/java-21-openjdk
# Or set org.gradle.java.home=... in gradle.properties

./gradlew build
# jar: build/libs/flexibook-1.0.0.jar

./gradlew runClient

In-game

Creative tab FlexiBook:

• Blank flexi_book
• FlexiBook Field Guide sample (EN/ZH lang; adaptive layout, i18n, rich text, images, links, search)

Right-click to open; arrow keys or buttons to turn pages; search at the bottom.

Data-driven books from a resource pack (after enabling the pack, F3+T):

/flexibook list
/flexibook give <namespace:bookId>
# e.g. /flexibook give note:note11

Requires permission level ≥ 2. Creative only lists blank + built-in demo; custom packs use the command.

Integrating other mods

Full reference (dependencies, Builder, markup, link safety, components, i18n, theme JSON, FAQ): docs/API.md.

ItemStack book = FlexiBookAPI.builder("my_guide")
    .titleKey("mymod.book.title")
    // .defaultFont(...) optional → runtime resolvedFont() = flexibook:default
    .h1("mymod.book.ch1")
    .p("mymod.book.p1")
    .font("mymod.book.quote", ResourceLocation.withDefaultNamespace("uniform")) // per-paragraph override
    .bullet("mymod.book.b1")
    .image(ResourceLocation.fromNamespaceAndPath("mymod", "textures/gui/icon.png"), 48, 48)
    .link("mymod.book.click", FlexiBookAPI.commandAction("mymod:open_map"))
    .divider()
    .fromMarkup("[p]mymod.book.extra[/p]") // whole-book raw only if elements are empty
    .buildItem();

// Safe actions only (do not register arbitrary shell)
FlexiBookAPI.registerCommandAction("mymod:open_map", ctx -> ctx.message("mymod.map.opened"));

Raw markup only (no explicit font still uses the built-in default):

AdaptiveBookContent content = AdaptiveBookContent.ofMarkup(
    new TranslatableText("mymod.book.title"),
    """
    [h1]mymod.book.ch1[/h1]
    [p]mymod.book.p1[/p]
    [bullet]mymod.book.b1[/bullet]
    """
);
// content.resolvedFont() → flexibook:default
ItemStack stack = FlexiBookAPI.createBook(content);

DataComponent id: flexibook:adaptive_book_content.

Themes register from resource pack JSON: assets/<namespace>/flexibook/themes/<path>.json → id namespace:path.
Font priority: span/heading font → book-level font → flexibook:default (see docs/API.md §12).

Six-part pack layout

assets/<ns>/
  lang/*.json
  font/*
  textures/gui/book.png
  textures/item/flexi_book.png   # optional: overrides flexibook item icon when under assets/flexibook/...
  flexibook/
    books/<id>.json              # index: content + theme + optional font
    contents/<id>.json           # body
    themes/<id>.json

ItemStack stack = FlexiBookAPI.createBookFromDefinition(
    ResourceLocation.fromNamespaceAndPath("myguide", "guide"));

Markup cheat sheet

Escape: \[ \].

v1 scope

Done: DataComponent, dual storage (elements or rawMarkup), TagParser, adaptive layout + cache, single-page Screen, Builder, bilingual sample book, search, data-driven themes (default + contain + JSON reload), built-in flexibook:default unihex (same ZIP as editor), standalone editor with Unihex preview, pack export/import, /flexibook give|list.

Not in v1 / simplified:

• Full lectern support (FlexiBookAPI.LecternCompat stub only)
• No hijacking vanilla written_book
• In-book WYSIWYG edit, tables, auto TOC, 3D page-turn animation

License

GNU GPL v3 © PhantomDaze