Struct BuildContext 

pub struct BuildContext<'a> {

    pub view: &'a CatalogView,
    pub recipes: &'a RecipeIndex,
    pub data: &'a Value,
    pub local: &'a mut LocalState,
    pub template: &'a dyn Fn(&str) -> Option<UiNode>,
    pub viewport_height: f32,
    pub viewport_width: f32,
    pub hairline: f32,
    pub row_extent: f32,
    pub menu_row: f32,
    pub tab_bar: f32,
    pub checkbox: f32,
    pub gap_px: &'a dyn Fn(&str) -> f32,
    pub expand_controls: bool,
    pub strings: &'a StringTable,
    pub breakpoint: Option<String>,
    pub locale: &'a str,
    pub wide: bool,
    pub today: Option<String>,
    pub formatter: &'a dyn Formatter,
    pub now: f64,
    pub data_version: u64,
    pub read_only: bool,
}

Fields

view: &'a CatalogView

recipes: &'a RecipeIndex

data: &'a Value

local: &'a mut LocalState

template: &'a dyn Fn(&str) -> Option<UiNode>

Reduce a template component by id into a normalized subtree.

viewport_height: f32

viewport_width: f32

Round 2: the viewport width (horizontal windows).

hairline: f32

$control.hairline (Resizable handles, list dividers) and $control.row (the extent of an unmeasured list item).

row_extent: f32

menu_row: f32

EXP-1259: $control.buttonSm, a menu row’s height (a searchable submenu’s list window).

tab_bar: f32

VAPP-162: $control.tabBar, the item height of a vertical bar Segmented (the navigation rail).

checkbox: f32

EXP-1548: $control.checkbox, the width of a Table’s selection column (part of the table’s minimum width).

gap_px: &'a dyn Fn(&str) -> f32

The theme’s default gap for List items per gap enum, in px.

expand_controls: bool

Expand form controls into label/field/description parts (a themed surface); off = geometry mode, every native is ONE measured leaf.

strings: &'a StringTable

The surface’s built-in string table.

breakpoint: Option<String>

The active breakpoint (None = base) for responsive native props.

locale: &'a str

The surface locale (week start).

wide: bool

The surface is at least md wide (the toast stack sits bottom-end).

today: Option<String>

Today as yyyy-mm-dd (the host’s clock; calendars open on it).

formatter: &'a dyn Formatter

Round 2: the surface formatter (Table cells, NumberField, chart ticks, pickers, calendar names, the format functions).

now: f64

The clock (epoch ms) relative times read.

data_version: u64

Bumped on every write to the data model (the key caches’ version).

read_only: bool

VAPP-200: a read-only surface: every writing control builds as disabled: true (crate::read_only::disables).