Struct RailMetrics 

pub struct RailMetrics {
    pub pad: f64,
    pub gap: f64,
    pub num_gutter: f64,
    pub header_h: f64,
    pub add_h: f64,
    pub add_margin: f64,
    pub menu_w: f64,
    pub menu_row_h: f64,
    pub menu_sep_h: f64,
    pub menu_pad: f64,
    pub menu_row_inset: f64,
}

The rail’s geometry, on the spacing scale. RailMetrics::DEFAULT restates the scale as the constants above — what PageSidebar::begin_frame has always laid out with, for a host that runs its layout pass without a Theme. A host that has one calls PageSidebar::begin_frame_with_theme and the same values are read from theme.tokens instead, so a density change reaches the rail.

Fields

pad: f64

Inset around the list and the header label (spacing.s3).

gap: f64

Vertical gap between thumbnails (spacing.s3).

num_gutter: f64

Width of the page-number gutter left of the thumbnails (spacing.s6).

header_h: f64

Height of the panel header band (spacing.s8).

add_h: f64

Height of the bottom add button (metrics.bar_height when themed; the restated default is 36).

add_margin: f64

Gap under the add button, to the rail’s bottom edge (spacing.s2).

menu_w: f64

Width of the context-menu popover (no token; the constant is kept).

menu_row_h: f64

Height of one menu row (spacing.s8).

menu_sep_h: f64

Height of the separator before Delete (spacing.s2).

menu_pad: f64

Padding above the first and below the last menu row (spacing.s2).

menu_row_inset: f64

Inset of a menu row, and of the menu from the rail’s edges (spacing.s1).

Implementations

impl RailMetrics

pub const DEFAULT: RailMetrics

The spacing scale restated, for a layout pass with no Theme.

pub fn from_theme(theme: &Theme) -> RailMetrics

The same geometry read from the theme’s tokens. The add button is a bar button (metrics.bar_height) rather than the restated 36; the menu width has no token and keeps its constant.

Trait Implementations

impl Clone for RailMetrics

fn clone(&self) -> RailMetrics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RailMetrics

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

Formats the value using the given formatter.

impl Default for RailMetrics

fn default() -> RailMetrics

Returns the “default value” for a type.

impl PartialEq for RailMetrics

fn eq(&self, other: &RailMetrics) -> 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 Copy for RailMetrics

impl StructuralPartialEq for RailMetrics