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https://github.com/interacto/interacto-javafx

Front-end framework for processing user interface events in JavaFX
https://github.com/interacto/interacto-javafx

event-processing framework front-end java javafx javafx-frameworks javafx-library user-interaction user-interface

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Front-end framework for processing user interface events in JavaFX

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# Interacto JavaFX



The JavaFX binding of the Interacto library.



Interacto is a UI library that eases the processing of user interface events.

A developer uses the Interacto fluent API to configure how a selected user interaction is transformed into a (undoable) command.



## Examples



Following a serie of examples. For each example, the first code chunk is the JavaFX code that uses standard UI events.

The second is the equivalent Interacto code.

 



- A very basic example. I want to undo the latest command by clicking on the undo button.



```java

undoButton.setOnAction(evt -> {

    // do the undo job here

});

```



```java

buttonBinder()

    .toProduce(Undo::new)

    .on(undoButton)

    .bind();

```



What differences?



You do not use UI event and listeners but pre-defined user interactions (provided by `buttonBinder` here).

In this case, the benefits is not direct as a button interaction is quite simple (it involves a single UI event).



You define commands (the `Undo` class here): classes that will do the job, and you can also add undo/redo features in your commands. 

Defining commands as classes have several benefits here:

your UI processing code is less complex as the command bahevior is defined in a specific class;

you can easily make your commands undoable;

you can access and manage the history of executed commands;

you factorise your code as commands may be executed in several places in your code. 



- I want to delete a selected object by pressing on the key `DELETE`.



```java

canvas.addEventHandler(KeyEvent.KEY_TYPED, evt -> {

    if(evt.getCode() == KeyCode.DELETE) {

        // do the deletion job here

    }

});

```



```java

shortcutBinder()

    .toProduce(() -> new DeleteShapes(canvas.getSelection()))

    .on(canvas)

    .with(KeyCode.DELETE)

    .bind();

```



Instead of having an `if` statement checking the key, you can use the routine `with` that will do the job for you.

So it reduces the cyclomatic complexity.



- I want to drag-and-drop (DnD) the selected color of a color picker onto an object to change its color.



A much more complex example in vanilla JavaFX.



```java

lineCol.addEventHandler(MouseEvent.MOUSE_DRAGGED, evt -> {

    lineCol.getScene().setCursor(new ColorCursor(lineCol.getValue()));

});



lineCol.addEventHandler(MouseEvent.MOUSE_RELEASED, evt -> {

    if(evt.getPickResult().getIntersectedNode() instanceof Shape) {

        // do the command here

    }

    lineCol.getScene().setCursor(Cursor.DEFAULT);

});

```



With this example, the Interacto code is not less verbose but much more direct and avoids the use of spaghetti of callbacks.



```java

nodeBinder()

    .usingInteraction(DnD::new)

    .toProduce(i -> new ChangeColour(lineCol.getValue(), null))

    .on(colorPicker)

    .first(i -> lineCol.getScene().setCursor(new ColorCursor(lineCol.getValue())))

    .then((i, c) -> i.getTgtObject().map(view -> (MyShape) view.getUserData()).ifPresent(sh -> c.setShape(sh)))

    .when(i -> i.getTgtObject().orElse(null) instanceof Shape)

    .endOrCancel(i -> colorPicker.getScene().setCursor(Cursor.DEFAULT))

    .bind();

```



with explanations:



```java

nodeBinder()

    // I want to use a built-in DnD interaction

    .usingInteraction(DnD::new)

    // to produce as output a command that will change the color of the targeted object

    .toProduce(i -> new ChangeColour(lineCol.getValue(), null))

    // the DnD operates on the color picker

    .on(colorPicker)

    // at the beginning of the DnD I change the cursor of the app

    .first(i -> lineCol.getScene().setCursor(new ColorCursor(lineCol.getValue())))

    // on each update of the ongoing DnD I look at the current targeted object

    .then((i, c) -> i.getTgtObject().map(view -> (MyShape) view.getUserData()).ifPresent(sh -> c.setShape(sh)))

    // 'When' is a predicate that constraints the execution of the command.

    // I want to change the color of a Shape object only

    .when(i -> i.getTgtObject().orElse(null) instanceof Shape)

    // when the DnD ends or is cancelled, I set the default cursor

    .endOrCancel(i -> colorPicker.getScene().setCursor(Cursor.DEFAULT))

    // I build the widget binding

    .bind();

```