onyxsdk_pen

This plugin integrates the Onyx Pen SDK into Flutter to improve e-ink performance in drawing apps.

Most of the SDK functionality is omitted due to it being restricted to Onyx devices. We instead only provide the OnyxSdkPenArea widget. The children of this widget (typically including a CustomPaint and GestureDetector) will automatically gain fluid pen strokes.

You are responsible for taking user input and drawing it. The OnyxSdkPenArea widget will just make things faster on Onyx devices.

When used on devices that aren't Onyx Android devices, the OnyxSdkPenArea widget will just return its child.

Getting Started

Android

See this commit for an example of the following setup...

`android/app/build.gradle`

android {
    defaultConfig {
        // Onyx SDK requires 23 or higher
        minSdkVersion 23
    }

    packagingOptions {
        pickFirst 'lib/*/libc++_shared.so'
        pickFirst 'androidsupportmultidexversion.txt'
    }
}

`android/app/src/main/AndroidManifest.xml`

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.adilhanney.saber">

    <!-- Add this `tools:replace` attribute to the `application` tag -->
    <application
        tools:replace="android:label">

    </application>
</manifest>

In my case, I got a compiler error saying that I needed tools:replace="android:allowBackup" so I merged the two with tools:replace="android:label,android:allowBackup".

`android/build.gradle`

allprojects {
    repositories {
        google()
        mavenCentral()

        // Add these two lines
        maven {
            url "https://jitpack.io"
        }
        maven {
            url "http://repo.boox.com/repository/maven-public/"
            allowInsecureProtocol true
        }
    }
}

`pubspec.yaml`

dependencies:
  onyxsdk_pen: ^1.0.3

`lib/main.dart`

// Wrap your drawable widget with the OnyxSdkPenArea widget, e.g.
OnyxSdkPenArea(
  child: GestureDetector(
    onPanUpdate: (details) {},
    child: CustomPaint(
      painter: MyPainter(points),
    ),
  ),
),

You can optionally run the init method in the main function of your app to initialize the Onyx SDK. This is not required, but it will improve initial performance on non-Onyx Android devices.

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await OnyxSdkPenArea.init();
  runApp(MyApp());
}

Help wanted

I no longer have an Onyx device, so I can't really develop this plugin any further. If you are able to, we're looking for help with this feature: https://github.com/saber-notes/saber/issues/848