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Automate code & data workflows with interactive notebooks

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livebook lib livebook_web live output frame_component.ex
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lib/livebook_web/live/output/frame_component.ex 

defmodule LivebookWeb.Output.FrameComponent do

  use LivebookWeb, :live_component



  @impl true

  def mount(socket) do

    {:ok, assign(socket, counter: 0, output_count: 0, persistent_id_map: %{})}

  end



  @impl true

  def update(assigns, socket) do

    {update_type, assigns} = Map.pop(assigns, :update_type, nil)

    {outputs, assigns} = Map.pop!(assigns, :outputs)



    socket = assign(socket, assigns)



    socket =

      if socket.assigns.counter == 0 do

        assign(socket,

          counter: 1,

          output_count: length(outputs),

          persistent_id_map: map_idx_to_persistent_id(outputs, socket.assigns.id)

        )

      else

        socket

      end



    socket =

      case update_type do

        nil ->

          assign(socket, outputs: outputs)



        :replace ->

          prev_output_count = socket.assigns.output_count

          prev_persistent_id_map = socket.assigns.persistent_id_map



          output_count = length(outputs)

          persistent_id_map = map_idx_to_persistent_id(outputs, socket.assigns.id)



          socket =

            assign(socket,

              outputs: outputs,

              output_count: output_count,

              persistent_id_map: persistent_id_map

            )



          less_outputs? = prev_output_count > output_count

          appended_outputs? = prev_output_count > map_size(prev_persistent_id_map)



          # If there are outputs that we need to remove, increase the counter.

          # Otherwise we reuse DOM element ids via persistent_id_map

          if less_outputs? or appended_outputs? do

            update(socket, :counter, &(&1 + 1))

          else

            socket

          end



        :append ->

          socket

          |> update(:outputs, &(outputs ++ &1))

          |> update(:output_count, &(length(outputs) + &1))

      end



    {:ok, socket}

  end



  defp map_idx_to_persistent_id(outputs, root_id) do

    outputs

    |> Enum.with_index()

    |> Map.new(fn {{output_idx, _}, idx} -> {output_idx, "#{root_id}-#{idx}"} end)

  end



  @impl true

  def render(assigns) do

    ~H"""

    <div id={"frame-output-#{@id}"}>

      <%= if @output_count == 0 do %>

        <div class="text-gray-300 p-4 rounded-lg border border-gray-200">

          Empty output frame

        </div>

      <% else %>

        <div id={"frame-outputs-#{@id}-#{@counter}"} phx-update="append">

          <LivebookWeb.Output.outputs

            outputs={@outputs}

            dom_id_map={@persistent_id_map}

            socket={@socket}

            session_id={@session_id}

            input_values={@input_values}

            client_id={@client_id}

          />

        </div>

      <% end %>

    </div>

    """

  end

end