yew_datatable_core/features/aggregation/
aggregation_fn.rs

1//! Custom aggregation function type for column-specific aggregation logic.
2//!
3//! Allows users to provide custom aggregation functions for columns
4//! that require specialized aggregation behavior in grouped rows.
5
6use std::fmt;
7
8/// Type alias for the boxed aggregation closure.
9type AggregateFn<T> = Box<dyn Fn(&[&T]) -> String + Send + Sync>;
10
11/// Custom aggregation function type.
12///
13/// Wraps a function that aggregates a slice of row references
14/// into a string representation.
15pub struct AggregationFn<T> {
16    /// The aggregation function.
17    aggregate: AggregateFn<T>,
18}
19
20impl<T> AggregationFn<T> {
21    /// Creates a new aggregation function.
22    ///
23    /// # Parameters
24    ///
25    /// - `f`: A function that aggregates row references into a string.
26    ///
27    /// # Returns
28    ///
29    /// - `AggregationFn<T>`: A new aggregation function instance.
30    pub fn new<F>(f: F) -> Self
31    where
32        F: Fn(&[&T]) -> String + Send + Sync + 'static,
33    {
34        Self { aggregate: Box::new(f) }
35    }
36
37    /// Aggregates a list of rows.
38    ///
39    /// # Parameters
40    ///
41    /// - `rows`: A slice of row references to aggregate.
42    ///
43    /// # Returns
44    ///
45    /// - `String`: The aggregated result as a string.
46    pub fn aggregate(&self, rows: &[&T]) -> String {
47        // Invoke the aggregation function.
48        (self.aggregate)(rows)
49    }
50}
51
52/// Formats the aggregation function for debug output.
53impl<T> fmt::Debug for AggregationFn<T> {
54    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
55        f.debug_struct("AggregationFn").finish_non_exhaustive()
56    }
57}
yew_datatable_core/features/aggregation/aggregation_fn.rs

yew_datatable_core/features/aggregation/
aggregation_fn.rs
