Dialog Box Problem

Question

i have created dialog box manually using stage and modility. the problem is when the dialog box executes the code following dialog box
gets executed before closing the dialog box. i want to use it like confirmation box in swing. i want to stop further execution of code till yes/no button of dialog box clicked.please suggest... please help me....

Answer 1

Ok, so it doesn't look like there is an easy way to do modality in JFX. I had thought since Swing does and JFX uses the same threading model that it should be do-able, but from what I can tell, Swing does some serious magic under the covers to make modal dialogs work.
Your best bet probably is to use callbacks instead. Make your own dialog window and instead of doing something like this:
int choice = MyDialog.show("Are you sure you want to do that?");
if (choice == MyDialog.OK)
    doTheAction();
} Do something more like:
MyDialog dialog = new MyDialog("Are you sure you want to do that?");
dialog.setOnOk(new EventHandler<ActionEvent>()
    public void handle(ActionEvent actionEvent)
        doTheAction();
});In fairness, that is probably a bit more 'correct' anyway and inline with the JFX style of doing things (although it is more code).
Here's some very, very rough code for doing something like what you want. You could obviously customise the class to take an enum of the button options available etc. It could all be improved a lot.
public class TestApp extends Application
    public static void main(String[] args) throws Exception
        launch(args);
    public void start(final Stage stage) throws Exception
        StackPane rootPane = new StackPane();
        FlowPane contentPane = new FlowPane();
        BorderPane dialogContent = new BorderPane();
        dialogContent.setStyle("-fx-background-color: white");
        dialogContent.setCenter(new Label("This is a dialog"));
        final Dialog dialog = new Dialog(dialogContent);
        dialog.setOnOk(new EventHandler<ActionEvent>()
            public void handle(ActionEvent actionEvent)
                System.out.println("Ok selected");
        dialog.setOnCancel(new EventHandler<ActionEvent>()
            public void handle(ActionEvent actionEvent)
                System.out.println("Cancel selected");
        Button showDialogButton = new Button("Show Dialog");
        showDialogButton.setOnAction(new EventHandler<ActionEvent>()
            public void handle(ActionEvent actionEvent)
                dialog.show(stage);
        contentPane.getChildren().add(showDialogButton);
        rootPane.getChildren().add(contentPane);
        BorderPane glassPane = new BorderPane();
        glassPane.setStyle("-fx-background-color: rgba(200, 200, 200, 0.5)");
        glassPane.visibleProperty().bind(dialog.showingProperty());
        rootPane.getChildren().add(glassPane);
        Scene scene = new Scene(rootPane, 300, 300);
        stage.setScene(scene);
        stage.show();
    private class Dialog extends Popup
        private BorderPane root;
        private EventHandler<ActionEvent> onOk;
        private EventHandler<ActionEvent> onCancel;
        private Button cancelButton;
        private Dialog(Node content)
            root = new BorderPane();
            root.setPrefWidth(200);
            root.setPrefHeight(200);
            root.setStyle("-fx-background-color: white; -fx-border-width: 1; -fx-border-color: gray");
            root.setTop(buildTitleBar());
            root.setCenter(content);
            root.setBottom(buildButtonBar());
            getContent().add(root);
        public void setOnOk(EventHandler<ActionEvent> onOk)
            this.onOk = onOk;
        public void setOnCancel(EventHandler<ActionEvent> onCancel)
            this.onCancel = onCancel;
        public void setContent(Node content)
            root.setCenter(content);
        private Node buildTitleBar()
            BorderPane pane = new BorderPane();
            pane.setStyle("-fx-background-color: #0000aa; -fx-text-fill: white; -fx-padding: 5");
            pane.setOnMouseDragged(new EventHandler<MouseEvent>()
                public void handle(MouseEvent event)
                    // not sure why getX and getY don't work
                    // double x = getX() + event.getX();
                    // double y = getY() + event.getY();
                    double x = event.getScreenX();
                    double y = event.getScreenY();
                    setX(x);
                    setY(y);
            Label title = new Label("My Dialog");
            pane.setLeft(title);
            Button closeButton = new Button("X");
            closeButton.setOnAction(new EventHandler<ActionEvent>()
                public void handle(ActionEvent actionEvent)
                    hide();
            pane.setRight(closeButton);
            return pane;
        protected Node buildButtonBar()
            FlowPane pane = new FlowPane(6, 6);
            pane.setAlignment(Pos.CENTER);
            Button okButton = new Button("OK");
            okButton.setOnAction(new EventHandler<ActionEvent>()
                public void handle(ActionEvent actionEvent)
                    hide();
                    if (onOk != null)
                        onOk.handle(actionEvent);
            pane.getChildren().add(okButton);
            Button cancelButton = new Button("Cancel");
            cancelButton.setOnAction(new EventHandler<ActionEvent>()
                public void handle(ActionEvent actionEvent)
                    hide();
                    if (onCancel != null)
                        onCancel.handle(actionEvent);
            pane.getChildren().add(cancelButton);
            return pane;
}