PrependLoadStateBuilder<PageKey, Value> class

A widget that builds a custom UI at the start of the list (prepend) based on the DataSource's loading state.

It provides hasMore and isLoading states to the builder, allowing you to:

• Show a button only when hasMore is true.
• Disable the button when isLoading is true.

Example:

PrependLoadStateBuilder(
  dataSource: dataSource,
  builder: (context, hasMore, isLoading) {
    // If there is no more data, show nothing.
    if (!hasMore) {
      return const SizedBox.shrink();
    }

    // Show a manual trigger button.
    // Disable it while loading to prevent double-tapping.
    return FilledButton(
      onPressed: isLoading ? null : () => dataSource.prepend(),
      child: const Text('Load Previous'),
    );
  },
)