JavaFX 2 and Scala - Like Milk and Cookies (33rd Degrees)

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JavaFX 2.0 and Scala, Like Milk
and Cookies Stephen Chin
Chief Agile
Methodologis...

Meet the Presenter

Stephen Chin
> Chief Agile
...

JavaFX 2.0 Platform
Immersive Application Experience
> Cross-platform
Animation, Video, Charting
> Integrate Java,...

Programming Languages
> JavaFX Script is no longer supported by Oracle
 Existing JavaFX Script based applications...

JavaFX

Scala

5

JavaFX With Java

JavaFX in Java
> JavaFX API uses an enhanced JavaBeans
pattern
> Similar in feel to other UI toolkits (Swing,
...

Example Application
public class HelloStage extends Application {
@Override public void start(Stage stage) {
sta...

Example Application Using Builders
public class HelloStage extends Application {

@Override public void start(Stage st...

Observable Properties
> Supports watching for changes to
properties
> Implemented via anonymous inner
classes
...

Observable Pseudo-Properties
final Rectangle rect = new Rectangle();
rect.setX(40);
rect.setY(40);
rect.setWidth(100);
rec...

Observable Pseudo-Properties
final Rectangle rect = new Rectangle();
rect.setX(40); The property we...

Observable Pseudo-Properties
final Rectangle rect = new Rectangle();
rect.setX(40); Only one list...

Observable Pseudo-Properties
final Rectangle rect = new Rectangle();
rect.setX(40);
rect.setY(40);
rect.setWidth(100);
rec...

Observable Pseudo-Properties
final Rectangle rect = new Rectangle();
rect.setX(40);
rect.setY(40);
rect.setWidth(100);
rec...

Binding
> Unquestionably the biggest JavaFX
Script innovation
> Supported via a PropertyBinding class
> Lazy inv...

Sequences in Java
> Replaced with an Observable List

> Public API is based on JavaFX sequences

> Internal code can...

Vanishing Circles

18

Application Skeleton
public class VanishingCircles extends Application {
public static void main(String[] args) {
Ap...

Create the Circles
List<Circle> circles = new ArrayList<Circle>();
for (int i = 0; i < 50; i++) {
final Circle circle = ...

Setup Binding
circle.strokeWidthProperty().bind(Bindings
.when(circle.hoverProperty())
.then(4)
.otherwise(0)
);
...

Setup Event Listeners
circle.addEventHandler(MouseEvent.MOUSE_CLICKED,
new EventHandler<MouseEvent...

Begin the Animation
Timeline moveCircles = new Timeline();
for (Circle circle : circles) {
KeyValue moveX = new KeyValue...

JavaFX With Scala

24

What is Scala
2012
2001 ...

Why Scala?
> Shares many language features with JavaFX Script
that make GUI programming easier:
 Static Type ...

Java vs. Scala DSL
public class VanishingCircles extends Application { object VanishingC...

object VanishingCircles extends JFXApp {
stage = new Stage {
title = "Disappearing Circles"
width = 800
heig...

object VanishingCircles extends JFXApp {
stage = new Stage {
title = "Disappearing Circles"
width = 800
heig...

object VanishingCircles extends JFXApp {
stage = new Stage {
title = "Disappearing Circles"
width = 800
heig...

object VanishingCircles extends JFXApp {
stage = new Stage {
title = "Disappearing Circles"
width = 800
...

object VanishingCircles extends JFXApp {
stage = new Stage {
title = "Disappearing Circles"
width = 800 ...

Binding in Scala
Infix Addition/Subtraction/Multiplication/Division:
height <== rect1.height + rect2.height
Aggregate Oper...

Animation in Scala
val timeline = new Timeline {
cycleCount = INDEFINITE
autoReverse = true
keyFrames = for (circle ...

JavaFX Script-like animation
Animation in Scala syntax: at (duration) {keyframes}

val timeline = new Timeline {
c...

Animation in Scala
val timeline = new Timeline {
cycleCount = INDEFINITE
autoReverse = true
keyFrames = for (circle ...

Animation in Scala
val timeline = new Timeline {
cycleCount = INDEFINITE
autoReverse = true
keyFrames = for (circle ...

Event Listeners in Scala
> Supported using the built-in Closure syntax
> Optional arguments for event objects
> 100%...

Event Listeners in Scala
> Supported using the built-in Closure syntax
> Optional arguments for event objects
> 100%...

Event Listeners in Scala
> Supported using the built-in Closure syntax
> Optional arguments for event objects Optional...

ScalaFX Internals
a.k.a. How to Write Your Own Scala DSL

With quotes from Stephen Colebourne (@jodastephen) to help
u...

Application Initialization
> JavaFX Requires all UI code executed on the
Application Thread
> But our ScalaFX Appl...

DelayedInit
> Introduced in Scala 2.9
> How to Use It:
1. Extend a special trait called DelayedInit
2. Impleme...

Hierarchical Implicit Conversions
> ScalaFX defines a set of proxies that mirror the
JavaFX hierarchy
> JavaFX cla...

N-Level Implicit Precedence
> Scala throws an exception if two implicits have the
same precedence
> Classes that a...

Properties
> JavaFX supports properties of type Boolean,
Integer, Long, Float, Double, String, and Object
> Proper...

@specialized
> Special annotation that generates primitive
variants of the class
> Improves performance by avoidin...

Bindings
> How does Scala know what order to evaluate this
in?

text <== when (rect.hover || circle.hover
&& !disa...

Operator Precedence Rules
> First Character Determines Precedence
Lowest Precedence
10. (all letters) E...

Operator Precedence

text <== when (rect.hover || circle.hover
11 10 9

&&...

Conclusion
> You can use Scala and JavaFX together.
> ScalaFX provides cleaner APIs that are tailor
designed for S...

Stephen Chin
steveonjava@gmail.com
tweet: @steveonjava

Pro JavaFX 2 Platform ...

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