同一窗格对象的事件处理程序

Question

我正在研究javaFX上事件处理程序的机制，但我不确定我是否理解了它，事实上我有一点怀疑：如果我有两个对象，它们有处理事件的所有必要代码（EventHandler接口ECC..），它们属于同一stackPane，问题是：有没有一种方法让第一个对象启动一个事件（例如ActionEvent)，尽管它们属于同一Pane但将由两个对象处理？因为对于我所理解的“事件路线”来说，这是不可能的，至少是直接的。实质上我的小程序有一个splitpane将屏幕分成两个stackpane，在左边的面板上我放了一个带有按钮的gridpane，它们每个都有允许绘制不同形状的功能，在右边的面板上有一个画布。

我的想法是在每个按钮的setonaction中启动一个ActionEvent,在画布上实现EventHandlers,用相应的handle方法捕获事件,并在handle模式下判断点击了哪个按钮以绘制正确的形状。有人能帮帮我吗？不管怎样，多谢了

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());
    }

}