REX about JavaFX8 used in SlideshowFX. This presentation covers concept from JavaFX as well as technologies like OSGi, Vert.x, LeapMotion, nashorn and friends in order to make them communicate inside one application developed in JavaFX. This presentation was made at the ElsassJUG

1. Thierry Wasylczenko
@twasyl
#JavaFX.forReal()
martine mocht den Code
ElsassJUG

2. Disclaimer
Swing lovers won’t be hurt and no beard or mustach will be shaved.
You will maybe discover new technologies or concepts. Don’t be
afraid.
The presentation of technologies are not promotional.
SlideshowFX is my own open source project and will only be used as
an example of implementations of technologies presented.
2

3. presentation.agenda()
public class Presentation extends Application {
public void init() { Speaker.load("twasyl"); }
public void start(Stage stage) {
JavaFX.getVersion(8).load();
new ScriptEngineManager().getEngineByName("nashorn");
Bundle.deploy("OSGi");
Markups.stream().filter(m -> m.name.equals("asciidoctor")));
vertx.createHttpServer().listen(8080, "localhost");
leapMotionController.isConnected();
}
public void stop() { Speaker.shutdown("twasyl"); }
}
3

4. 4

5. 5

6. 6

7. #JavaFX 8
7

8. <2 />
<8>

9. FXML

10. FXML-the easy one
<BorderPane xmlns:fx="http://javafx.com/fxml">
<top>
<MenuBar>
<Menu text="File">
<MenuItem text="Quit" />
</Menu>
</MenuBar>
</top>
<center>
<FlowPane>
<Button text="Show" />
<Button text="more" />
</FlowPane>
</center>
</BorderPane>
10

11. FXML-the controller
• The backend of FXML
• Associated to the view
public class MyController implements Initializable {
// Some interesting things to code
@Override
public void initialize(URL url, ResourceBundle resourceBundle)
// Some other interesting things to code !
}
}
11

12. FXML + controller
<BorderPane fx:controller="com.SuperController">
<center>
<Button text="Click !" fx:id="myButton"
onAction="#doSomething" />
</center>
</BorderPane>
public class SuperController implements Initializable {
@FXML private Button myButton;
@FXML private void doSomething(ActionEvent e) {}
}
12

13. FXML-fx:define
<BorderPane fx:controller="com.SuperController">
<fx:define>
<Double fx:id="MY_DOUBLE" fx:value="20.0" />
</fx:define>
<center>
<TextField text="$MY_DOUBLE" />
</center>
</BorderPane>
13

14. FXML-fx:factory
...
<ComboBox promptText="IP address">
<items><NetworkUtils fx:factory="getObservableIPs" /></items>
</ComboBox>
...
public class NetworkUtils {
public static ObservableList<String> getObservableIPs() {
/* ... */
}
}
14

15. FXML-fx:reference
<BorderPane fx:controller="com.SuperController">
<fx:define>
<TabPane fx:id="myTabPane" />
<FXCollections fx:id="myList" fx:factory="observableArrayList"
<fx:reference source="myTabPane" />
</FXCollections>
</fx:define>
<center>
<fx:reference source="myTabPane" />
</center>
</BorderPane>
15

16. Customization

17. • CSS
• Inline
• Stylesheets
• Programmatically
• Custom pseudo state
• A component’s type = a CSS class
• Button  .button
• TextField  .text-field
• ...
Customization 17

18. Customization -CSS
<AnchorPane>
<stylesheets>
<URL value="@/path/of/your/stylesheet.css" />
</stylesheets>
<Button text="Button 1" style="-fx-background-color: red" />
<Button text="Button 2" class="my-super-class" />
</AnchorPane>
button1.setStyle("-fx-text-fill: white");
button2.getStyleClass().add("my-super-class");
18

19. Customization -Pseudo state
PseudoClass ps = PseudoClass.getPseudoClass("awesome");
myButton.pseudoClassStateChanged(ps, true);
.button:awesome {
-fx-text-fill: orange;
}
#myButton:awesome {
-fx-text-fill: green;
}
19

20. • Fully customized UI
• CSS already known
• Specifities
• Not always that easy
Customization
REX
20

21. Properties

22. Properties -types
IntegerProperty intP = new SimpleIntegerProperty();
DoubleProperty doubleP = new SimpleDoubleProperty();
// ...
BooleanProperty booleanP = new SimpleBooleanProperty();
StringProperty stringP = new SimpleStringProperty();
ObjectProperty<Conference> objectP = new SimpleObjectProperty<>();
22

23. Properties -binding
IntegerProperty intP1 = new SimpleIntegerProperty();
IntegerProperty intP2 = new SimpleIntegerProperty();
intP1.bind(intP2);
intP2.set(10);
System.out.println("And P1? " + intP1.get());
23

24. Properties -binding
IntegerProperty intP1 = new SimpleIntegerProperty();
IntegerProperty intP2 = new SimpleIntegerProperty();
intP1.bindBidirectional(intP2);
intP2.set(10);
System.out.println("And P1? " + intP1.get());
intP1.set(20);
System.out.println("And P2? " + intP2.get());
24

25. Properties -Events
IntegerProperty intP1 = new SimpleIntegerProperty();
intP1.addListener((valueInt, oldInt, newInt) -> {
System.out.println("Change");
});
intP1.set(10);
25

26. Properties -POJO 2.0
public class Conference {
private StringProperty name = new SimpleStringProperty();
public StringProperty nameProperty() { return this.name; }
public String getName() { return this.name.get(); }
public void setName(String name) { this.name.set(name); }
}
final Conference jug = new Conference();
tf.textProperty().bindBidirectional(jug.nameProperty());
26

27. Not serializable

28. Properties -POJO 1.5
public class Conference {
private PropertyChangeStatus pcs =
new PropertyChangeStatus(this);
private String name;
public void addPropertyChangeListener(PropertyChangeListener list
this.pcs.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(PropertyChangeListener l
this.pcs.removePropertyChangeListener(listener);
}
28

29. Properties -POJO 1.5
public class Conference {
// ...
public void addPropertyChangeListener(String propertyName, Proper
this.pcs.addPropertyChangeListener(propertyName, listener);
}
public void removePropertyChangeListener(String propertyName, Pro
this.pcs.removePropertyChangeListener(propertyName, listener);
}
// ...
}
29

30. Properties -POJO 1.5
public class Conference {
// ...
public String getName() { return this.name; }
public void setName(String name) {
final String old = this.name;
this.name = name;
this.pcs.firePropertyChange("name", old, this.name);
}
}
30

31. Properties -POJO 1.5
final Conference jug = new Conference();
JavaBeanStringPropertyBuilder builder = new ...
JavaBeanStringProperty nameProperty = builder.bean(jug)
.name("name")
.build();
nameProperty.addListener((valueName, oldIName, newName) -> {
// ...
});
31

32. Controls

33. ImageView

34. ImageView-FXML
<ImageView>
<image>
<Image url="@/path/to/my-image.png" preserveRatio="true"
smooth="true" backgroundLoading="true"
requestedHeight="20" requestedWidth="20" />
</image>
</ImageView>
34

35. ImageView-Java
final URL url = ...
final InputStream stream = ...
final Image image1 = new Image(url, true);
final Image image2 = new Image(stream);
final ImageView view = new ImageView(image1);
• Prefer the Image contructor with a URL
35

36. WebView

37. WebView-the State
final WebView browser = new WebView();
browser.getEngine().stateProperty().addListener((stateValue, oldSta
if(newState == Worker.State.SUCCEEDED) {
final Element div = browser.getEngine().getDocument()
.getElementById("twasyl");
if(div != null) {
div.getTextContent();
}
}
});
37

38. WebView-interact with events
• When the page sends event:
webEngine.setOnAlert(event -> { /* ... */ } );
webEngine.setOnError(event -> { /* ... */ } );
webEngine.setPromptHandler(event -> { /* ... */ } );
38

39. • WebHistory
• int getMaxSize()
• ObservableList<WebHistory.Entry>
getEntries()
• WebHistory.Entry
• Date getLastVisitedDate()
• String getTitle()
• String getUrl()
WebView-history 39

40. • Stylesheet inheritance
• HTML buttons inherit from JavaFX
buttons
• ...
• Performance
WebView
REX
40

41. TableView

42. TableView-basics
@FXML private TableView<Conference> confs;
@Override public void initialize(URL location, ResourceBundle bundl
final Conference conf1 = new Conference("BreizhJUG");
final Conference conf2 = new Conference("NantesJUG");
final Conference conf3 = new Conference("NormandyJUG");
final Conference conf4 = new Conference("ElsassJUG");
this.confs.getItems().addAll(conf1, conf2, conf3, conf4);
}
42

43. TableView-display an image 1/3
public class ImageCell extends TableCell<Conference, Image> {
protected void updateItem(Image item, boolean empty) {
if(!empty && item != null) {
final ImageView view = new ImageView(item);
setGraphic(view);
} else {
setGraphic(null);
}
}
}
43

44. TableView-display an image 2/3
public class ImageCellFactory implements
Callback<TableColumn<Conference, Image>,
TableCell<Conference, Image>> {
@Override
public TableCell<Conference, Image> call(TableColumn<Conference,
final TableCell<Conference, Image> cell =
new ImageCell<Conference, Image>();
return cell;
}
}
44

45. TableView-display an image 3/3
@FXML private TableView<Conference> confs;
@Override public void initialize(URL location, ResourceBundle bundl
final TableColumn<Conference, Image> logoColumn =
new TableColumn<>("Logo");
logoColumn.setCellValueFactory(
new PropertyValueFactory<Conference, Image>("logo")
);
logoColumn.setCellFactory(new ImageCellFactory());
this.confs.getColumns().add(logoColumn);
}
45

46. TableView-FXML
<TableView fx:id="confs">
<columns>
<TableColumn text="Logo">
<cellValueFactory>
<PropertyValueFactory property="logo" />
</cellValueFactory>
<cellFactory> <ImageCellFactory /> </cellFactory>
</TableColumn>
</columns>
</TableView>
46

47. Concurrency

48. • Questions:
1. How to not block my UI when I
download a file ?
2. How to work with the file when
download is done ?
• javafx.concurrent
• Worker
• Task
• Service
• ScheduledService
concurrency.setTricky(true) 48

49. • Implements Worker
• Task#updateMessage(String)
• Task#updateProgress(long,long)
• Task#get() // blocking
• Task#getValue() // non-blocking
• Task#succeeded()
• Task#running()
• Task#failed()
• Task#cancelled()
• Worker.State
Concurrency-Task 49

50. Concurrency-Task example 1/2
public class DownloadPresentationTask extends Task<File> {
@Override
protected File call() throws Exception {
return new File("awesome.pdf");
}
@Override
protected void succeeded() {
super.succeeded();
this.updateMessage("Download successful");
this.updateProgress(0, 0);
}
}
50

51. Concurrency-Task example 2/2
final DownloadPresentationTask task = new DownloadPresentationTask(
task.stateProperty().addListener((value, oldState, newState) -> {
if(newState == Worker.State.SUCCEEDED
&& task.getValue() != null) {
// Do awesome things
}
});
new Thread(task).start();
51

52. Packaging

53. • Native applications
• Embed a JRE
• No need to download a JRE
• javafxpackager tool
• Ant tasks
Packaging 53

54. UI testing

55. • Automaton
• Support both Swing and JavaFX 2
• Works with JavaFX 8
• Tests can be written in groovy
• TestFX
• Very fluent API
UI testing 55

56. Tooling

57. SceneBuilder
• FXML WYSIWYG editor + CSS support
57

58. Scenic View 58

59. #JavaScript
59

60. • Execute standalone JavaScript
function sayHello(name) {
print("Hello " + name);
}
sayHello('Thierry');
$ jjs hello.js
Hello Thierry
Nashorn 60

61. • Execute Java from JavaScript
$ jjs java.js
[Hello, world]
Nashorn
function displayList() {
var ArrayList = Java.type('java.util.ArrayList'
var lst = new ArrayList();
lst.add("Hello");
lst.add("world");
print(lst);
}
61

62. Nashorn -embedding
ScriptEngineManager engineManager = new ScriptEngineManager();
ScriptEngine engine = engineManager.getEngineByName("nashorn");
engine.eval("function sum(a, b) { return a + b; }");
System.out.println(engine.eval("sum(1, 2);"));
62

63. • Useful ?
• Web-based app
• One browser to test
• Web developer for front
• Java deveveloper for back
• SlideshowFX
• Polyglotism
Nashorn -JavaFX 63

64. Nashorn -JavaFX
WebView webView = new WebView();
// Make a Java object available in the page
JSObject window = (JSObject) webView.getEngine()
.executeScript("window");
window.setMember("sfx", SlideshowFXController.this);
// Execute some JavaScript
webView.getEngine().executeScript("sum(1, 2);");
64

65. • What’s done:
• DOM manipulation
• Get current slide
• Inject custom JS libraries
• Advantages
• JavaFX – HTML communication
• Tip
• Use Base64 strings for interopability
Nashorn -SlideshowFX
REX
65

66. #OSGi
66

67. • Jigsaw will bring modularity
• Penrose : explore interoperability between
Jigsaw & OSGi
• For now: modularity = OSGi
In Jigsaw's shadow 67

68. • The Dynamic Module System for Java
• June 2014
• OSGi Release 6
• ClassPath
• Handle it or die
OSGi -Huh? 68

69. • OSGi container
• Apache Felix
• Apache Karaf
• eclipse equinox
• Services
• To be registered
OSGi -services 69

70. OSGi -embedding
Map configurationMap = new HashMap<>();
configurationMap.put("org.osgi.framework.bootdelegation",
"sun.misc, javax.*, javafx.*");
configurationMap.put("felix.auto.deploy.action", "install,start"
// Starting OSGi
FrameworkFactory frameworkFactory = ServiceLoader.load(FrameworkFac
Framework osgiFramework = frameworkFactory.newFramework(configurati
try {
osgiFramework.start();
LOGGER.fine("OSGI container has bee started successfully");
} catch (BundleException e) {
LOGGER.log(Level.SEVERE, "Can not start OSGi server");
}
70

71. OSGi -deploy services
Bundle bundle = null;
try {
bundle = osgiFramework.getBundleContext()
.installBundle("file:/Users/twasyl/MyBundle.jar");
} catch (BundleException e) {
// Log
}
if(bundle != null) {
try {
bundle.start();
} catch (BundleException e) {
// Log
}
}
71

72. OSGi -JavaFX tips
FXMLLoader loader = new FXMLLoader(getClass().getClassLoader()
.getResource("/path/to/my.fxml"));
Pane root = null;
try {
// Tip: need to set the ClassLoader
loader.setClassLoader(getClass().getClassLoader());
root = loader.load();
this.controller = loader.getController();
} catch (IOException e) {
// Log
}
72

73. • What’s done
• Embed Felix
• Support new syntax
• Add extensions
• Add hosting connectors
• Advantage
• Extend the app without modifying the
app
• Tips
• Think ClassLoader
• Think boot delegation
OSGi -SlideshowFX
REX
73

74. #asciidoctor
74

75. • Simplified syntax for complex rendering
• Diagrams
• Formulas
• Written in Ruby
• Ports
• JavaScript
• JVM
The popular syntax 75

76. AsciidoctorJ & OSGi
• Parse asciidoctor in Java
• from files
• from strings
RubyInstanceConfig config = new RubyInstanceConfig();
config.setLoader(AsciidoctorMarkup.class.getClassLoader());
JavaEmbedUtils.initialize(Arrays.asList(
"META-INF/jruby.home/lib/ruby/2.0",
"gems/asciidoctor-1.5.2/lib"), config);
Asciidoctor asciidoctor = Asciidoctor.Factory
.create(AsciidoctorMarkup.class.getClassLoader());
76

77. Asciidoctor -Parsing
• From strings
String html = asciidoctor.convert("I'm a hero",
new HashMap<String, Object>());
• From files
File myFile = new File("myFile.adoc");
List<File> myFiles = new ArrayList<>(); // Add files then
Map<String, Object> options = new HashMap<>();
String html = asciidoctor.convertFile(myFile, options);
String[] htmls = asciidoctor.convertFiles(myFiles, options);
77

78. • Markup syntax
• OSGi context
• Advantage
• Trendy way to define slides' content
• Tip
• Usage in an OSGi context requires a
lot of attention
Asciidoctor -SlideshowFX
REX
78

79. #Vert.x
79

80. • Lightweight for the JVM
• Polyglot components
• Java
• JavaScript
• Groovy
• CoffeeScript
• Python
• Ruby
• ...
Innovative JVM server 80

81. Vert.x-Verticles
• Verticle = piece of the server
• Do some things
• Each Verticle has an instance of Vertx
public class MyVerticle extends Verticle {
@Override
public void start() {
// Do something
}
}
81

82. Vert.x-RouteMatcher
• Respond to requests
RouteMatcher routeMatcher = new RouteMatcher();
routeMatcher.get("/my-app/about.html", request -> { /* ... */ })
.post("/my-app/submit", request -> { /* ... */ } );
HttpServer server = vertx.createHttpServer();
server.requestHandler(routeMatcher)
.listen(8080, "192.168.218.100");
82

83. Vert.x-Websockets
Handler<ServerWebSocket> handler = serverWebSocket -> {
if (serverWebSocket.path().equals("/my-app")) {
// ...
} else {
serverWebSocket.reject();
}
};
HttpServer server = vertx.createHttpServer();
server.websocketHandler(handler)
.listen( 8080, "192.168.218.100");
83

84. Vert.x-Event Bus
• Communicating system between Verticles
• Cross Vert.x instances
Handler<Message<String>> handler = message -> {
System.out.println("Hello" + message.body());
message.reply();
};
this.vertx.eventBus().registerHandler("say.hello", handler);
this.vertx.eventBus().publish("say.hello", "Thierry");
84

85. Vert.x-Shared Data
• Share data between Verticles
• Not cross Vert.x instances
Map serverInfo = vertx.sharedData().getMap("serverInfo");
Set users = vertx.sharedData().getSet("users");
serverInfo.put("ip", "192.168.218.100");
users.add("thierry");
85

86. • What’s done
• Chat using websockets
• Quizz feature
• Twitter integration
• Advantages
• Embed a web server easily
• No installation for the client
• Tip
• Store HttpServer instances as
singleton for re-usage
Vert.x-SlideshowFX
REX
86

87. #LeapMotion
87

88. • New world, new possibilities
• Forget your mouse
• Java, C++, Unity/C#, JavaScript, Python,
Objective-C
The touchless world 88

89. • -Djava.library.path
• By
• platform
• architecture
• Packaging = warning
  
LeapMotion -Native libraries 89

90. LeapMotion -The controller
• Main interface with the device
• Access
• Frames
• Configuration information
• Use listeners
Controller leapController = new Controller();
90

91. LeapMotion -The listener
• Respond to events
• onInit
• onExit
• onConnect
• onDisconnect
• onFrame
Listener wonderfulListener = new WonderfulListener();
controller.addListener(listener);
91

92. • What’s done
• Change slides
• Show a pointer
• Perform clicks
• Advantage
• Bring interactivity
• Tip
• Think gestures
LeapMotion -SlideshowFX
REX
92

93. Books 93

94. 94