Struct TextFontFamilyConfig 

pub struct TextFontFamilyConfig {
    pub ui_sans: Vec<String>,
    pub ui_serif: Vec<String>,
    pub ui_mono: Vec<String>,
    pub common_fallback_injection: TextCommonFallbackInjection,
    pub common_fallback: Vec<String>,
}

Overrides for the default font family selection used by the text system.

This is intended to be persisted in settings/config files and applied by the host/runner. It configures the three generic families used by TextStyle.font (Ui/Serif/Monospace).

Notes:

• Entries are treated as ordered “try this first” candidates; backends will pick the first installed family name and ignore unknown ones.
• This does not attempt to model per-script fallback chains yet (ADR 0029); for now, we expose a single common_fallback list for cross-script “no tofu” baseline behavior.

Fields

ui_sans: Vec<String>

ui_serif: Vec<String>

ui_mono: Vec<String>

common_fallback_injection: TextCommonFallbackInjection

Controls how common_fallback is injected into the effective font stack.

• platform_default: prefer deterministic injection on wasm/bundled-only environments; on native system-font builds, keep named families on the system-fallback lane but inject the framework no-tofu baseline into generic UI families.
• none: never inject common_fallback into the explicit stack (system fallback only).
• common_fallback: inject common_fallback into both generic and named family stacks to enforce a “no tofu” baseline (may override system fallback selection on desktop).

common_fallback: Vec<String>

Additional family candidates appended to the framework fallback stack.

This list is intended to cover “missing glyph” cases for mixed-script UIs (CJK + emoji + RTL) without requiring per-span font selection.

Trait Implementations

impl Clone for TextFontFamilyConfig

fn clone(&self) -> TextFontFamilyConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextFontFamilyConfig

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

Formats the value using the given formatter.

impl Default for TextFontFamilyConfig

fn default() -> TextFontFamilyConfig

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TextFontFamilyConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for TextFontFamilyConfig

fn eq(&self, other: &TextFontFamilyConfig) -> 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 Serialize for TextFontFamilyConfig

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for TextFontFamilyConfig

impl StructuralPartialEq for TextFontFamilyConfig