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Dala is a native mobile framework for Elixir powered by the BEAM VM. Build iOS and Android apps with OTP, lightweight processes, fault tolerance, AI/ML.

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dala lib dala hardware scanner.ex
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lib/dala/hardware/scanner.ex 

defmodule Dala.Hardware.Scanner do

  @compile {:nowarn_undefined, [:Nx]}

  @moduledoc """

  QR code and barcode scanner.



  Requires `:camera` permission (request via `Dala.Permissions.request/2`).



  Opens a full-screen camera preview. When a code is detected the view dismisses

  automatically and the result is delivered to `handle_info`:



      handle_info({:scan, :result,    %{type: :qr, value: "https://..."}}, socket)

      handle_info({:scan, :cancelled},                                       socket)



  iOS: `AVCaptureMetadataOutput`. Android: `CameraX` + ML Kit `BarcodeScanning`.



  > **Android dependency:** add to `app/build.gradle`:

  > `implementation 'com.google.mlkit:barcode-scanning:17.2.0'`

  > `implementation 'androidx.camera:camera-camera2:1.3.0'`

  > `implementation 'androidx.camera:camera-lifecycle:1.3.0'`

  > `implementation 'androidx.camera:camera-view:1.3.0'`

  """



  @type format ::

          :qr

          | :ean13

          | :ean8

          | :code128

          | :code39

          | :upca

          | :upce

          | :pdf417

          | :aztec

          | :data_matrix



  @doc """

  Open the barcode scanner.



  Options:

    - `formats: [format]` — list of barcode formats to detect (default `[:qr]`)

  """

  @spec scan(Dala.Ui.Socket.t(), keyword()) :: Dala.Ui.Socket.t()

  def scan(socket, opts \\ []) do

    formats = Keyword.get(opts, :formats, [:qr]) |> Enum.map(&Atom.to_string/1)

    formats_json = :json.encode(formats)

    Dala.Platform.Native.scanner_scan(formats_json)

    socket

  end

end