Enum LayoutBreakpoint 

pub enum LayoutBreakpoint {
    Narrow,
    MediumNarrow,
    Medium,
    Wide,
    UltraWide,
}

Responsive layout breakpoint based on terminal width.

Topology Matrix

Surface	Narrow (<80)	MediumNarrow (80-119)	Medium (120-159)	Wide (≥160)
Search	Single pane, focus	Side-by-side tight	Side-by-side balanced	Side-by-side spacious
└ Results	Full-width or hide	min 35 cols	min 45 cols	min 50 cols
└ Detail	Full-width or hide	min 25 cols	min 32 cols	min 34 cols
└ Split handle	None (no split)	Active (draggable)	Active (draggable)	Active (draggable)
└ Navigation	Focus toggles pane	Focus + mouse + drag	Focus + mouse + drag	Focus + mouse + drag
Analytics	Compact chrome	Standard chrome	Full chrome + tabs	Full chrome + tabs
└ Tab bar	Hidden (active only)	Hidden (active only)	Full tab bar	Full tab bar
└ Filter summary	Hidden	Shown	Shown	Shown
└ Footer hints	Minimal	Full nav hints	Full nav hints	Full nav hints
└ Content views	min 20w×4h guard	Full area, inline adjust	Full area, inline adjust	Full area, inline adjust
Detail modal	Full-screen overlay	Full-screen overlay	Full-screen overlay	Full-screen overlay
Other modals	Centered, fixed	Centered, fixed	Centered, fixed	Centered, fixed
Footer	“narrow”	“med-n”	“med”	“wide”
Inspector	“Narrow (<80)”	“MedNarrow (80-119)”	“Medium (120-159)”	“Wide (>=160)”

Interaction expectations

• Narrow: Keyboard-primary. Tab/Enter switches between results ↔ detail. No split handle. Mouse clicks work on the visible pane only.
• MediumNarrow: Both panes visible but tight. Detail shows wrapped message previews (25-col minimum). Split handle is draggable but range is constrained.
• Medium: Comfortable dual-pane. Both panes have enough room for full content. Split handle draggable within 25–75% range.
• Wide: Spacious dual-pane. Extra width used for wider result columns and full detail formatting. Split handle draggable within 25–75% range.

Ultra-narrow fallback

Below ULTRA_NARROW_MIN_WIDTH (30) or ULTRA_NARROW_MIN_HEIGHT (6), the full UI is not rendered. Instead, a compact “terminal too small” message is shown. This prevents layout panics and unreadable content at degenerate sizes (e.g., 10x3). See LayoutBreakpoint::is_ultra_narrow.

Analytics surface notes

Analytics view content areas do NOT consume LayoutBreakpoint — each view checks its assigned Rect dimensions directly (e.g., area.height < 4 as a minimum guard) and adapts layout inline. The breakpoint drives the outer chrome: header tab bar visibility, filter summary, and footer hint density. See AnalyticsTopology for the per-breakpoint contract.

Variants

Narrow

<80 cols: single pane with tab switching (very tight)

MediumNarrow

80-119 cols: side-by-side with tight detail pane

Medium

120-159 cols: side-by-side results/detail with balanced ratio

Wide

=160 cols: comfortable side-by-side results + detail panes

UltraWide

=240 cols: massive screen real-estate with expansive detail pane

Implementations

impl LayoutBreakpoint

pub fn from_width(cols: u16) -> Self

Classify from terminal width.

pub fn is_ultra_narrow(width: u16, height: u16) -> bool

Check whether the given dimensions are below the ultra-narrow threshold.

When true, the UI should render a minimal fallback instead of the full surface. This prevents empty/broken layouts at very constrained sizes.

pub fn search_topology(self) -> SearchTopology

Return the search surface topology contract for this breakpoint.

pub fn analytics_topology(self) -> AnalyticsTopology

Return the analytics surface topology contract for this breakpoint.

pub fn visibility_policy(self) -> VisibilityPolicy

Return the visibility policy for optional UI elements at this breakpoint.

pub fn footer_label(self) -> &'static str

Short label for the status footer.

pub fn inspector_label(self) -> &'static str

Descriptive label for the inspector overlay.

pub fn cockpit_topology(self, mode: CockpitMode) -> CockpitTopology

Return the cockpit overlay topology for this breakpoint and mode.

Trait Implementations

impl Clone for LayoutBreakpoint

fn clone(&self) -> LayoutBreakpoint

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LayoutBreakpoint

impl Debug for LayoutBreakpoint

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for LayoutBreakpoint

impl PartialEq for LayoutBreakpoint

fn eq(&self, other: &LayoutBreakpoint) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for LayoutBreakpoint