Deck

A navigable ordered collection of surfaces within a region. A deck represents movement through contextual space.

Examples:

• discover deck
• communication deck
• navigation deck
• system deck
• calendar deck

A deck is NOT:

• a carousel (content loops; decks represent distinct contextual states)
• a tab bar (fixed navigational strip)
• a menu (command list)
• a scroll view (continuous content)

Deck orientation — the primary navigation axis:

• vertical — Elonn's initial implementation
• horizontal
• radial
• stacked

Sub-concepts:

• active surface — the currently focused surface within a deck; only one surface is active at a time
• adjacent surfaces — neighboring surfaces partially visible during navigation; provide spatial awareness and transition continuity
• deck transition — movement between surfaces; may be gesture-driven, programmatic, voice-driven, gaze-driven, or keyboard-driven
• snap threshold — normalized gesture distance required to commit a transition (typically 12–18%)
• interpolation — continuous visual transition state between surfaces; controls position, opacity, scale, depth, and rotation
• stack depth — relative visual depth of a surface within a deck
• reveal edge — visible portion of an adjacent surface; critical for orientation and spatial continuity

Allowed:

• deck
• [name] deck (e.g., discover deck, communication deck)
• deck transition
• active surface
• adjacent surface

Forbidden:

• carousel
• tab
• stack (ambiguous with call stack; use deck)
• slider
• pager

Notes:

• Decks exist inside regions. Surfaces exist inside decks.
• Elonn's initial implementation is a vertical stacked deck.

Related:

• surface
• region
• runtime
• block
• navigation