JavaFX Properties and Bindings

JavaFX Properties and Bindings

Use this skill when UI state should stay synchronized without manual widget updates scattered throughout the codebase.

Example

import javafx.beans.binding.Bindings;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;

public class CounterView extends VBox {

    private final IntegerProperty count = new SimpleIntegerProperty(0);

    public CounterView() {
        var label = new Label();
        label.textProperty().bind(Bindings.format("Count: %d", count));

        var increment = new Button("Increment");
        increment.setOnAction(event -> count.set(count.get() + 1));

        getChildren().addAll(label, increment);
    }

    public IntegerProperty countProperty() {
        return count;
    }
}

Setup notes

• Expose properties when other UI parts need to bind to them.
• Prefer bindings for derived display values and listeners for side effects.
• Keep domain logic out of event handlers when a presentation model would make the state clearer.