add GraniteQRCodeGenerator and all needed dependencies

build.sbt

@@ -17,6 +17,7 @@ libraryDependencies ++= Seq(
   "javax.servlet" % "javax.servlet-api" % "3.1.0" % "provided",
   "com.vaadin" % "vaadin-core" % vaadinVersion,
   "com.typesafe.akka" %% "akka-actor" % akkaVersion,
+  GraniteQRCodeGenerator.qrcode,
   "org.slf4j" % "slf4j-simple" % "1.7.25"
 )
 

project/.gitignore

@@ -1 +1,2 @@
+/project/
 /target/

project/GraniteQRCodeGenerator.scala

@@ -0,0 +1,21 @@
+import sbt._
+
+object GraniteQRCodeGenerator {
+
+  val qrcodeVersion = "1.1.4"
+
+  /** Granite QRCode Generator
+    * https://www.webcomponents.org/element/LostInBrittany/granite-qrcode-generator
+    *
+    * https://mvnrepository.com/artifact/org.webjars.bowergithub.lostinbrittany/granite-qrcode-generator/1.1.4
+    *
+    * intransitive, because of the reference to org.webjars.bowergithub.lifthrasiir » qr.js	[0.0.20110119...
+    * is not available in repositories
+    *
+    * Content manually copied to frontend/bower_components/qrjs
+    *
+    */
+
+  val qrcode = "org.webjars.bowergithub.lostinbrittany" % "granite-qrcode-generator" % qrcodeVersion intransitive()
+
+}

src/main/scala/org/scala_vienna/raffle/CreatorView.scala

@@ -25,9 +25,12 @@ import org.vaadin.addons.vaactor.Vaactor
 )
 class CreatorView extends VerticalLayout with Vaactor.HasActor {
 
+  val qrCode = new GraniteQRCodeGenerator()
+
   add(
     new H1("Vaactor Raffle"),
-    new Button("Create raffle", { _ => Manager ! Manager.Create })
+    new Button("Create raffle", { _ => Manager ! Manager.Create }),
+    new Button("QR-Code", _ => add(qrCode))
   )
 
   override def receive: Receive = {

src/main/scala/org/scala_vienna/raffle/GraniteQRCodeGenerator.scala

@@ -0,0 +1,10 @@
+package org.scala_vienna.raffle
+
+import com.vaadin.flow.component.dependency.HtmlImport
+import com.vaadin.flow.component.{Component, Tag}
+
+@Tag("granite-qrcode-generator")
+@HtmlImport("bower_components/granite-qrcode-generator/granite-qrcode-generator.html")
+class GraniteQRCodeGenerator extends Component {
+
+}

src/main/webapp/frontend/bower_components/qrjs/.bower.json

@@ -0,0 +1,14 @@
+{
+  "name": "qrjs",
+  "homepage": "https://github.com/lifthrasiir/qr.js",
+  "version": "0.0.20110119",
+  "_release": "0.0.20110119",
+  "_resolution": {
+    "type": "version",
+    "tag": "v0.0.20110119",
+    "commit": "b3d7fdedeb909f9b12b8435697d75175d961cbc6"
+  },
+  "_source": "git://github.com/lifthrasiir/qr.js.git",
+  "_target": "*",
+  "_originalSource": "lifthrasiir/qr.js"
+}

src/main/webapp/frontend/bower_components/qrjs/README.md

@@ -0,0 +1,8 @@
+# qr.js: QR code generator in pure Javascript (2011)
+
+This is a fairly standalone script for producing QR code on the fly.
+Originally developed for my own interest, the code is fully commented and well-structured.
+The code is in the public domain (or to be exact, [Creative Commons Zero](https://creativecommons.org/publicdomain/zero/1.0/)),
+and you can use it for absolutely any purpose.
+
+See also a [node.js module based on qr.js](https://github.com/shesek/qruri), packaged by Nadav Ivgi.