Adopt iOS Audiobooks navigation patterns for consistency

• Challenge: provide ways to help readers find their place (same as audiobooks), particularly in different book types with lots of pages, and potentially lots of chapters and bookmarks

Features

Chapters (thin lines), bookmarks (red dots) and session marker (white dot) with HUD visual feedback when "scrubbing" borrow patterns from audiobooks on iOS; HUD travel distance relative to fixed Touch Bar length is proportionate to window width

Chapters (thin lines), bookmarks (red dots) and session marker (white dot) with HUD visual feedback when "scrubbing" borrow patterns from audiobooks on iOS; HUD travel distance relative to fixed Touch Bar length is proportionate to window width

Slightly different scrubbing behavior for fixed-layout ePubs (e.g. comics, Read-Aloud book types); graphical HUD shows the target page thumbnail, and main page updates only on finger release

Slightly different scrubbing behavior for fixed-layout ePubs (e.g. comics, Read-Aloud book types); graphical HUD shows the target page thumbnail, and main page updates only on finger release

Impact

• Released features in time with the launch of the very first MacBook Pros to feature Touch Bar

  https://twitter.com/marrathon/status/880133705951588353

  https://twitter.com/andreas_k_huber/status/838710802764922880

  https://twitter.com/hpjtwitt/status/993495141124984832

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