Struct ParamSnapshot 

pub struct ParamSnapshot<'a> {
    pub get_param: &'a dyn Fn(u32) -> f32,
    pub get_param_plain: &'a dyn Fn(u32) -> f32,
    pub format_param: &'a dyn Fn(u32) -> String,
    pub get_meter: &'a dyn Fn(u32) -> f32,
    pub get_options: &'a dyn Fn(u32) -> Vec<String>,
    pub default_normalized: &'a dyn Fn(u32) -> f32,
    pub next_discrete_normalized: &'a dyn Fn(u32) -> f32,
    pub param_name: &'a dyn Fn(u32) -> String,
    pub widget_type: &'a dyn Fn(u32) -> WidgetType,
}

Immutable view of one frame’s worth of parameter state.

Each field is a borrowed closure, so the snapshot itself is cheap to construct - no copying of values up front. Closures are read on demand as widgets/dispatch need them.

Fields

get_param: &'a dyn Fn(u32) -> f32

Read normalized value (0.0–1.0).

get_param_plain: &'a dyn Fn(u32) -> f32

Read plain (unit-scaled) value.

format_param: &'a dyn Fn(u32) -> String

Format the current plain value as a display string.

get_meter: &'a dyn Fn(u32) -> f32

Read a meter value (0.0–1.0).

get_options: &'a dyn Fn(u32) -> Vec<String>

Enumerate option display strings for a discrete/enum parameter. Returns empty if the parameter is continuous or not dropdown-shaped.

default_normalized: &'a dyn Fn(u32) -> f32

Default normalized value, used for reset-on-double-click.

next_discrete_normalized: &'a dyn Fn(u32) -> f32

Compute the next normalized value after a click-to-cycle selector advance. Wraps around at the end of the range.

param_name: &'a dyn Fn(u32) -> String

Parameter display name. Used as a fallback label when a layout entry did not supply its own (e.g. XY-pad axis names).

widget_type: &'a dyn Fn(u32) -> WidgetType

Auto-detected widget type from the parameter’s range. widgets::draw uses this when the layout entry did not specify an explicit widget kind.