Struct PaneAffordanceTheme 

pub struct PaneAffordanceTheme {
    pub background: Color,
    pub splitter_idle: Color,
    pub splitter_hover: Color,
    pub splitter_active: Color,
    pub snap: Color,
    pub focus_ring: Color,
    pub high_contrast: bool,
}

Themeable colors for pane interaction affordances (bd-3bfbp).

Covers the splitter rail/handle in its three interaction states (idle / hover / active), the magnetic-snap dock-preview emphasis, and the keyboard focus ring around the active pane. Every color is derived from a ResolvedTheme slot — there are no ad-hoc hardcoded values — and then contrast-clamped so the affordance stays visible against the pane surface it is drawn on:

• In the default profile each state meets at least WCAG AA: the large-text bar (3.0:1) for the ever-present low-emphasis idle divider, and the normal-text bar (4.5:1) for the meaning-bearing hover/active/snap/ring states.
• In the high-contrast profile (high_contrast = true) every state is lifted to WCAG AAA (7.0:1).

Clamping preserves the themed hue when it already passes the target, and otherwise blends it toward whichever extreme (pure black or pure white) maximizes contrast with the surface, by the smallest amount that reaches the target ratio. This keeps affordances on-palette in well-designed themes while guaranteeing they never become invisible in low-contrast ones.

Fields

background: Color

Surface the affordances are drawn on (the pane background).

splitter_idle: Color

Idle splitter rail/handle (low-emphasis, always-present divider).

splitter_hover: Color

Hovered splitter (pointer over the handle).

splitter_active: Color

Actively dragged splitter.

snap: Color

Magnetic-snap / dock-preview emphasis.

focus_ring: Color

Keyboard focus ring around the active pane.

high_contrast: bool

Whether this was built in the high-contrast profile.

Implementations

impl PaneAffordanceTheme

pub fn from_resolved(theme: &ResolvedTheme, high_contrast: bool) -> Self

Derive affordance colors from a resolved theme.

high_contrast selects the WCAG target tier (AA vs AAA). Pass the effective accessibility preference for the host here.

pub fn min_contrast_ratio(&self) -> f64

The minimum WCAG contrast ratio across all affordance states vs the surface. Useful as a single accessibility health metric in tests.

Trait Implementations

impl Clone for PaneAffordanceTheme

fn clone(&self) -> PaneAffordanceTheme

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PaneAffordanceTheme

impl Debug for PaneAffordanceTheme

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

Formats the value using the given formatter.

impl Eq for PaneAffordanceTheme

impl PartialEq for PaneAffordanceTheme

fn eq(&self, other: &PaneAffordanceTheme) -> 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 PaneAffordanceTheme