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RxKotlinFX

Kotlin extensions to the RxJavaFX library. This framework works especially well with TornadoFX. See a fully functional demo here!

Documentation

Learning RxJava with JavaFX

Binaries

Binaries and dependency information for Maven, Ivy, Gradle and others can be found at http://search.maven.org.

Example for Maven:

<dependency>
    <groupId>com.github.thomasnield</groupId>
    <artifactId>rxkotlinfx</artifactId>
    <version>x.y.z</version>
</dependency>

Gradle:

repositories {
    mavenCentral()
}
dependencies {
    compile 'com.github.thomasnield:rxkotlinfx:x.y.z'
}

Contributing

Feel free to contribute and help streamline a pragmatic UI stack with Kotlin, RxJava, and JavaFX. Speaking of stacks, this project may be used in conjunction with TornadoFX and RxKotlin. Please make sure no extension naming conventions conflict with these two other libraries :)

Features

RxKotlinFX is the convergence of interoperability between RxJava, JavaFX, and Kotlin.

RxKotlinFX contains Kotlin extensions to RxJavaFX as well as additional Observable operators specific to JavaFX. It also is in exporatory stages to add helpful Node extension functions that return Observables. This exploration is inspired by the JavaFX/Kotlin interop project TornadoFX. Where TornadoFX handles layouts, node extensions, DI, and other JavaFX/Kotlin interoperations, this library will seek to integrate RxJava with JavaFX in the same spirit using Kotlin. The vision is to add useful extensions that put Observable streams as properties and functions on JavaFX components, especially where ObservableValue properties are not readily available.

RxJavaFX Extensions

The core API implements RxJavaFX static factories as extension functions.

Observable of Button ActionEvents

val myButton = Button("Press Me")
val subscription = myButton.actionEvents().subscribe { println("Pressed!") } 

Creating a Reactive Binding

val myButton = Button("Press Me")

val countBinding = myButton.actionEvents().map { 1 }
    .scan(0, { x,y -> x + y })
    .map { it.toString() }
    .toBinding()
    
val myLabel = Label()
myLabel.textProperty().bind(countBinding)

Observable of ObservableList Events

val items = FXCollections.observableArrayList("Alpha", "Beta", "Gamma")

val changes = items.changes()

changes.filter { it.flag == Flag.ADDED }
        .map { it.value }
        .subscribe { println("ADDED $it") }

items.add("Delta")
items.add("Epsilon")

OUTPUT

ADDED Delta
ADDED Epsilon

Turning an ObservableList into a Hot Concatenation

val observableList = FXCollections.observableArrayList<String>()

observableList.onChangedObservable()
        .flatMap {
            it.toObservable().map { it.length }
                    .map { it.toString() }
                    .reduce { s1,s2 -> s1 + "|"  + s2  }
        }
        .subscribe { println(it) }

observableList.setAll("Alpha", "Beta", "Gamma")
observableList.add("Delta")
observableList.add("Epsilon")
observableList.remove("Alpha")

OUTPUT

5|4|5
5|4|5|5
5|4|5|5|7
4|5|5|7

Using a Dialog or Alert

val dialog = Alert(AlertType.CONFIRMATION, "Are you sure you want to continue?")

dialog.toObservable().filter { it == ButtonType.YES }
	.subscribe { println("You pressed YES") } 

Using and Disposing CompositeBinding

val binding1: Binding = ...
val binding2: Binding = ... 

//adding one at a time
val bindings = CompositeBinding()
val bindings += binding1
val bindings += binding2

//or all at once
val bindings = CompositeBinding(binding1,binding2)

//do stuff, then dispose Bindings
bindings.dispose()

Operators

RxKotlinFX has a growing list of operators placed as extension functions onto Observable that aid interoperability with JavaFX.

The doOnXXXCount() operators are especially helpful for providing a status update of how many items have been "processed" by an Observable.

val source = Observable.range(1,1000)
val processedCountLabel = Label()

source.map { it * 10 }
     .doOnNextFx { processedCountLabel.text = "Processed $it items" }
     .subsribe { doSomethingWith(it) }

Control Extensions

The rest of the project will likely add convenient extension functions to emit events as Observable values, much like the TornadoFX project has done. For example, helpful Observable extension functions and properties can be added to TableView and ListView, such as selection events.

val tableView: TableView<MyItem> = ...
val selections: Observable<MyItem> = tableView.itemSelections
val rowIndexSelections: Observable<Int> = tableView.rowIndexSelections

Check releases as well the Nodes code file to see a list of available extensions. Feel free to contribute if you see any missing.

Bugs and Feedback

For bugs, questions and discussions please use the Github Issues.

LICENSE

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.