PlaceholderData<TQueryData>.compute constructor

const PlaceholderData<TQueryData>.compute(
  1. TQueryData? compute(
    1. TQueryData? previousData,
    2. Query<TQueryData>? previousQuery
    )
)

The callback form: return previousData to keep the last page's content on screen while the new key loads, or anything else derived from it. Returning null means no placeholder.

Implementation

const factory PlaceholderData.compute(
  TQueryData? Function(
          TQueryData? previousData, Query<TQueryData>? previousQuery)
      compute,
) = PlaceholderDataCompute<TQueryData>;