Event handler for objects of the same Pane

Question

i'm studying the mechanism of the event handler on javaFX ,but i'm not sure that i have understand it , in Fact I have a little doubt : if i have two object , they have all necessary code to handle the event (EventHandler interface ecc..),that they BELONG at the SAME stackPane ,the question is : is there a way for the 1st object to launch an event (ActionEvent for example ) that will be handled by the 2 object though they belong at the same Pane? Because for what i have understand about the "event route",this is not possible ,at least directly. In essence my little program have a splitpane that divided in two stackpane the screen,in the left panel i have put a gridpane with the button, each of them have the function that permit to draw a different shape ,in the right panel with a canvas.

My idea it was to launch an ActionEvent in setonaction of each button ,implements the EventHandlers on canvas to capture the event with relative handle method ,and in the corp of he handle mode discriminate which button is Clicked for drawing the correct shape. Can someone help me ? Thanks a lot anyway

Answer 1

            package es1;

            import javafx.application.Application;
            import javafx.event.ActionEvent;
            import javafx.event.Event;
            import javafx.event.EventHandler;
            import javafx.scene.Scene;
            import javafx.scene.control.Button;
            import javafx.scene.control.SplitPane;
            import javafx.scene.control.TextField;
            import javafx.scene.layout.StackPane;
            import javafx.stage.Stage;

    /**
     *
     * @author DAVIDE
     */
         public class Es1 extends Application {

                @Override
                public void start(Stage primaryStage) {
                Button btn = new Button();
                btn.setText("Say 'Hello World'");
                btn.setOnAction(new EventHandler<ActionEvent>() {

                @Override
                public void handle(ActionEvent event) {
                    System.out.println("Hello World!");
                    lanciaevento(this.getClass().toString());

                }
            });

            //add a button on left panel and a textfiled on the right for test if the event launched
            //on the click of the button is reached by the textfield 
            Textfield text = new Textfield();
            StackPane panel1 = new StackPane();
            panel1.getChildren().addAll(btn);
            StackPane panel2 = new StackPane();
            panel2.getChildren().addAll(text);

            splitpane divisore = new splitpane();
            divisore.addEventHandler(ActionEvent.ACTION, divisore);
            divisore.getItems().addAll(panel1,panel2);


            Scene scene = new Scene(divisore, 600, 450);

            primaryStage.setTitle("Hello World!");
            primaryStage.setScene(scene);
            primaryStage.show();

        }


        public void lanciaevento(String oggetto)
        {
            ActionEvent evento    = new ActionEvent();
        }

        /**
         * @param args the command line arguments
         */


        public static void main(String[] args) {
            launch(args);
        }


       }

---

            package es1;

            import javafx.event.ActionEvent;
            import javafx.event.EventHandler;
            import javafx.scene.control.SplitPane;

            /**
             *
             * @author DAVIDE
             */
            public class splitpane extends SplitPane implements EventHandler<ActionEvent>{

                private String message_event;



                public String get_message()
                {
                 return(message_event);
                }

                public void set_message(String messaggio)
                {
                 message_event = messaggio;   

                }

                @Override
                public void handle(ActionEvent event) {
                            System.out.println("mi ha mandato un messaggio "+event.getSource().toString());

                }



            }

---

             /*
     * To change this license header, choose License Headers in Project Properties.

package es1;

   import javafx.event.ActionEvent;
   javafx.event.EventHandler;
   import javafx.scene.control.TextField;

/**
 *
 * @author DAVIDE
 */
public class Textfield extends TextField implements EventHandler<ActionEvent> {


    @Override
    public void handle(ActionEvent event) {
        this.appendText(event.getSource().toString());
    }

}