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Alpha: Phoenix LiveView components for interactive Selecto query building and data exploration

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selecto_components lib selecto_components views detail pagination.ex
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lib/selecto_components/views/detail/pagination.ex 

defmodule SelectoComponents.Views.Detail.Pagination do

  @moduledoc false



  alias SelectoComponents.Form.ParamsState



  def apply_page(socket, page) when is_integer(page) do

    safe_page = clamp_page(page, socket.assigns[:view_meta] || %{})



    params =

      socket.assigns[:used_params] ||

        ParamsState.view_config_to_params(socket.assigns.view_config)



    params = Map.put(params, "detail_page", Integer.to_string(safe_page))



    updated_socket =

      socket

      |> Phoenix.Component.assign(:current_detail_page, safe_page)



    updated_socket = ParamsState.view_from_params(params, updated_socket)



    {:ok, updated_socket, params}

  end



  def apply_page(socket, _page), do: apply_page(socket, 0)



  def clamp_page(page, view_meta) do

    requested_page = max(page, 0)

    per_page = max(Map.get(view_meta, :per_page, 30), 1)

    total_rows = max(Map.get(view_meta, :total_rows, 0), 0)



    max_page =

      if total_rows > 0 do

        div(total_rows - 1, per_page)

      else

        0

      end



    min(requested_page, max_page)

  end

end