ModalConfirmExample.java

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.ButtonBuilder;
import javafx.scene.control.LabelBuilder;
import javafx.scene.effect.BoxBlur;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.HBoxBuilder;
import javafx.scene.paint.Color;
import javafx.scene.web.WebView;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

/**
 * Demonstrates a modal confirm box in JavaFX. Dialog is rendered upon a blurred
 * background. Dialog is translucent.
 */
public class ModalConfirmExample extends Application {

	public static void main(String[] args) {

		launch(args);
	}

	@Override
	public void start(final Stage primaryStage) {

		// initialize the stage
		primaryStage.setTitle("Modal Confirm Example");
		final WebView webView = new WebView();
		webView.getEngine().load("http://docs.oracle.com/javafx/");
		primaryStage.setScene(new Scene(webView));
		primaryStage.show();

		// initialize the confirmation dialog
		final Stage dialog = new Stage(StageStyle.TRANSPARENT);
		dialog.initModality(Modality.WINDOW_MODAL);
		dialog.initOwner(primaryStage);
		dialog.setScene(new Scene(HBoxBuilder
				.create()
				.styleClass("modal-dialog")
				.children(
						LabelBuilder.create().text("Will you like this page?")
								.build(),
						ButtonBuilder.create().text("Yes").defaultButton(true)
								.onAction(new EventHandler<ActionEvent>() {

									@Override
									public void handle(ActionEvent actionEvent) {

										// take action and close the dialog.
										System.out.println("Liked: "
												+ webView.getEngine()
														.getTitle());
										primaryStage.getScene().getRoot()
												.setEffect(null);
										dialog.close();
									}
								}).build(),
						ButtonBuilder.create().text("No").cancelButton(true)
								.onAction(new EventHandler<ActionEvent>() {

									@Override
									public void handle(ActionEvent actionEvent) {

										// abort action and close the dialog.
										System.out.println("Disliked: "
												+ webView.getEngine()
														.getTitle());
										primaryStage.getScene().getRoot()
												.setEffect(null);
										dialog.close();
									}
								}).build()).build(), Color.TRANSPARENT));
		dialog.getScene()
				.getStylesheets()
				.add(getClass().getResource("modal-dialog.css")
						.toExternalForm());

		// allow the dialog to be dragged around.
		final Node root = dialog.getScene().getRoot();
		final Delta dragDelta = new Delta();
		root.setOnMousePressed(new EventHandler<MouseEvent>() {

			@Override
			public void handle(MouseEvent mouseEvent) {

				// record a delta distance for the drag and drop operation.
				dragDelta.x = dialog.getX() - mouseEvent.getScreenX();
				dragDelta.y = dialog.getY() - mouseEvent.getScreenY();
			}
		});
		root.setOnMouseDragged(new EventHandler<MouseEvent>() {

			@Override
			public void handle(MouseEvent mouseEvent) {

				dialog.setX(mouseEvent.getScreenX() + dragDelta.x);
				dialog.setY(mouseEvent.getScreenY() + dragDelta.y);
			}
		});

		// show the confirmation dialog each time a new page is loaded.
		webView.getEngine().getLoadWorker().stateProperty()
				.addListener(new ChangeListener<Worker.State>() {

					@Override
					public void changed(
							ObservableValue<? extends Worker.State> observableValue,
							Worker.State state, Worker.State newState) {

						if (newState.equals(Worker.State.SUCCEEDED)) {
							primaryStage.getScene().getRoot()
									.setEffect(new BoxBlur());
							dialog.show();
						}
					}
				});
	}

	// records relative x and y co-ordinates.
	class Delta {

		double x, y;
	}
}