Don't panic in Fortaleza - ScalaFX

JavaFX

Scala

Como fazer em casa algo que custa mais de U$15 mil?

Gastando apenas R$20mil?

Stage { title: "Hello World" width: 400 height: 250 scene: Scene { fill: Color.ALICEBLUE content: Text { font: Font { name: "Envy Code R" size: 20 } x: 105, y: 120 content: "Hello World!" } }}

JavaFX Script 1.3


public class HelloWorld extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage primaryStage) { primaryStage.setTitle("Hello World"); Group root = new Group(); Scene scene = new Scene(root, 400, 250, Color.ALICEBLUE); Text text = new Text(); text.setX(105); text.setY(120); text.setFont(Font.font("Envy Code R", 20)); text.setText("Hello World!"); root.getChildren().add(text); primaryStage.setScene(scene); primaryStage.show(); }}


Stage { Scene { Text { "Hello World!" x: 105, y: 120 font: Font { name: "Envy Code R" size: 20pt } } fill: ALICEBLUE } title: "Hello World" width: 400 height: 250}


public void start(Stage primaryStage) { primaryStage.setTitle("Hello World"); primaryStage.setScene( SceneBuilder.create() .width(400) .height(250) .fill(Color.ALICEBLUE) .root( GroupBuilder.create().children( TextBuilder.create() .x(105) .y(120) .text("Hello World!") .font(Font.font("Envy Code R", 20)) .build() ).build() ) .build()); primaryStage.show();}

scene graph

CSS styling

animations & transitions

event management

.dmg.msi.exe

.rpm

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GroovyFX.start { primaryStage -> def sg = new SceneGraphBuilder() sg.stage( title: 'Hello World', show: true) { scene( fill: aliceblue, width: 400, height: 250) { text( x: 105, y: 120, text: "Hello World!" font: '20pt "Envy Code R"') } }}


object HelloWorld extends JFXApp { stage = new JFXApp.PrimaryStage { title = "Hello World" scene = new Scene(400, 250) { fill = Color.ALICEBLUE content = new Text { font = Font("Envy Code R", 20) x = 105; y = 120 text = "Hello World!" } } }}

I can honestly say if someone had shown me the Programming in Scala book by Martin Odersky, Lex Spoon & Bill Venners back in 2003, I'd probably have never created Groovy.

James Strachan

James Strachan

Scala is statically typed and compiles down to the same fast bytecode as Java so it's usually about as fast as Java.


Scala has type inference - so it's typically as concise as Ruby/Groovy but that everything has static types.



Scala has high order functions and closure support along with sequence comprehensions so you can write beautifully concise code.



Scala does take a little bit of getting used to - I confess the first few times I looked at Scala it wasn't that pleasing on the eye.

Scala has high order functions and closure support along with sequence comprehensions so you can write beautifully concise code.

Static

ally ty

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JVM bytecode

Type inference

High order functions

Closu

res

Sequence comprehension Not t

hat p

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eye

Beautifully concise code

Por que Scala?

> Compartilha muitas funcionalidades do JavaFX Script que tornam a programação de interfaces mais fácil:

Checagem estática de tipos – Encontre seus erros em tempo de compilaçãoClosures / traits – Misture os comportamentos e passe-os como referênciaDeclarativa – Expresse a interface como ela deve aparecer

> Scala também permite implementar suas DSLs!Conversões implícitas – extensão de classes typesafeSobrecarga de operadores – com regras de precedênciaDelayedInit / @specialized – funcionalides avançadas da linguagem

object VanishingCircles extends JFXApp { stage = new JFXApp.PrimaryStage { title = "Vanishing Circles" width = 800 height = 600 scene = new Scene { fill = BLACK content = for (i <- 0 until 50) yield new Circle { centerX = random * 800 centerY = random * 600 radius = 150 fill = color(random, random, random, 0.2) effect = new BoxBlur(10, 10, 3) } } }}

Classe base para aplicações ScalaFX


Definição Declarativa do Stage


Definições das propriedades no corpo


Criação de Sequência via Comprehension

Animação em ScalaFX

val timeline = new Timeline { cycleCount = INDEFINITE autoReverse = true keyFrames = for (circle <- circles) yield at (40 s) { Set( circle.centerX -> random * stage.width.get, circle.centerY -> random * stage.height.get ) }}timeline.play

Sintaxe de animação como no JavaFX Script:

at (duração) {keyframes}


val timeline = new Timeline { cycleCount = INDEFINITE autoReverse = true keyFrames = for (circle <- circles) yield at (40 s) { Set( circle.centerX -> random * stage.width.get, circle.centerY -> random * stage.height.get ) }}timeline.play Sobrecarga de operador para

sintaxe de animação


val timeline = new Timeline { cycleCount = INDEFINITE autoReverse = true keyFrames = for (circle <- circles) yield at (40 s) { Set( circle.centerX -> random * stage.width tween EASE_BOTH, circle.centerY -> random * stage.height tween EASE_IN ) }}timeline.play Sintaxe tween

opcional

Event Listeners em ScalaFX

> Suportado usando sintaxe Closure embutida> Argumentos opcionais para tratamento de eventos> 100% tipagem forte

Sintaxe compacta{body}

onMouseClicked = {

Timeline(at(3 s){radius->0}).play

}

Event Listeners em ScalaFX

> Suportado usando sintaxe Closure embutida> Argumentos opcionais para tratamento de eventos> 100% tipagem forte

onMouseClicked = { (e: MouseEvent) =>

Timeline(at(3 s){radius->0}).play

}

Evento = parametro opcional {(event) => body}

Binding em ScalaFX

Adição/Subtração/Multiplicação/Divisão Infixas:

height <== rect1.height + rect2.height

Operadores de Agregação:

width <== max(rect1.width, rect2.width, rect3.width)

Expressões Condicionais:

strokeWidth <== when (hover) choose 4 otherwise 0

Expressões Compostas:

text <== when (rect.hover || circle.hover && !disabled) choose textField.text + " is enabled" otherwise "disabled"

2001Scala começou

2003/2004Scala v1.0

2006Scala v2.0

2013Scala 2.10.1 (última)

Alain Béarez

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(* ~10×106 ms Unix Epoch)

Don't panic in Fortaleza - ScalaFX

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