offline_document_viewer 0.1.0

View PDF, Word, Excel and PowerPoint documents fully offline. Renders on the device with bundled open-source engines — no network, no server, no cloud.

Changelog

0.1.0

First release.

Added

• DocumentView — renders a document with no chrome of its own.
• DocumentViewController — search, navigation, outline, status and typed failures, as a ChangeNotifier.
• DocumentSource.file / .bytes / .asset.
• DocumentPreflight — standalone validation you can run before showing UI.
• Sealed DocumentFailure hierarchy with RecoveryHints and no user-facing strings, so wording stays with the host application.

Formats

Nine formats, each verified rendering on a device.

• PDF through PDFium, natively.
• DOCX, XLSX, PPTX, XLS and CSV through bundled JavaScript engines.
• XLSX ships a custom xl/styles.xml parser covering borders, fonts, alignment, theme colours with tint and shade, merges, frozen panes and hidden rows and columns — none of which SheetJS Community Edition exposes.
• RTF is converted to HTML in Dart, preserving paragraphs, emphasis, colours, alignment and lists.
• DOC and PPT are read through a Dart OLE compound file reader and shown as text, labelled textOnly. Word's piece table is followed so mixed 8-bit and UTF-16 runs decode correctly; PowerPoint's slide masters, speaker notes and internal version stamps are skipped so only slide content is shown.

Bundled engine fixes

Eight upstream defects are patched in the vendored engines; each is marked in the source and documented in THIRD_PARTY_NOTICES.md.

• docx-preview: themeFill ignored, themeTint/themeShade not applied, and w:val="auto" overriding theme text colours.
• PPTXjs: bullet fonts not inherited from layout or master, Wingdings excluded from dingbat conversion, numeric XML character references left undecoded, a hard crash on a missing docProps/app.xml, and numCol / vert ignored.

Layout

• Word pages, slides and spreadsheets are scaled to the viewport on render. Fixed-width documents otherwise read as broken on a phone rather than merely zoomed out.

Compatibility

• Android Gradle Plugin 9 rejects a ProGuard file referenced by flutter_inappwebview 6.1.x. The dependency constraint is left open so an application can select the 6.2 line without this package forcing a pre-release on everyone; the README explains when to do so.

Security

• Zip bomb, path traversal and entry-count checks that read the central directory without inflating anything.
• Strict per-platform Content Security Policy with connect-src 'none'.
• Navigation outside the document workspace refused.
• Android WebView renderer-process death contained and surfaced as a recoverable failure.