32 lines
1.3 KiB
Rust
32 lines
1.3 KiB
Rust
// ================================================================================================
|
|
// COMPUTED FIELDS - Provider and Context
|
|
// ================================================================================================
|
|
|
|
/// Context information provided to computed field calculations
|
|
#[derive(Debug, Clone)]
|
|
pub struct ComputedContext<'a> {
|
|
/// All field values in the form (index -> value)
|
|
pub field_values: &'a [&'a str],
|
|
/// The field index being computed
|
|
pub target_field: usize,
|
|
/// Current field that user is editing (if any)
|
|
pub current_field: Option<usize>,
|
|
}
|
|
|
|
/// User implements this to provide computed field logic
|
|
pub trait ComputedProvider {
|
|
/// Compute value for a field based on other field values.
|
|
/// Called automatically when any field changes.
|
|
fn compute_field(&mut self, context: ComputedContext) -> String;
|
|
|
|
/// Check if this provider handles the given field.
|
|
fn handles_field(&self, field_index: usize) -> bool;
|
|
|
|
/// Get list of field dependencies for optimization.
|
|
/// If field A depends on fields [1, 3], only recompute A when fields 1 or 3 change.
|
|
/// Default: depend on all fields (always recompute) with a reasonable upper bound.
|
|
fn field_dependencies(&self, field_index: usize) -> Vec<usize> {
|
|
(0..100).collect()
|
|
}
|
|
}
|