JavaFX:事件

package sample;

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.control.Button;
import javafx.scene.control.Label;

// 实现事件处理方法
public class ButtonHandle implements EventHandler<ActionEvent> {

    Label label=new Label();
    Button ok=new Button("ok");
    Button cancel=new Button("cancel");

    @Override
    public void handle(ActionEvent actionEvent) {
        if (actionEvent.getSource()==ok){
            label.setText(" you get ok item");
        }else if (actionEvent.getSource()==cancel){
            label.setText(" you get cancel item");
        }
    }
}

package sample;

import javafx.application.Application;
import javafx.event.Event;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Pos;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
//        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");

//        FlowPane root = new FlowPane();
        Pane root=new Pane();
        primaryStage.setTitle("Hello World");

        ButtonHandle handle=new ButtonHandle();

        // 方法01

        //为ok 按钮注册事件处理起
//        handle.ok.setOnAction(handle);
        //为cancel按钮注册事件处理起
//        handle.cancel.setOnAction(handle);

        // 方法02
//        handle.ok.addEventHandler(ActionEvent.ACTION,handle);
//        handle.cancel.addEventHandler(ActionEvent.ACTION,handle);

        //方法03
        /*handle.ok.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                handle.label.setText("你单击的是ok按钮");
            }
        });

        handle.cancel.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                handle.label.setText("你单击的是cancel按钮");
            }
        });
*/
        // 方法4
        handle.ok.setOnAction(actionEvent -> {
            handle.label.setText("你单击的是ok按钮");
        });
        handle.cancel.setOnAction(actionEvent -> {
            handle.label.setText("你单击的是cancel按钮");
        });


        //  圆
        final Circle circle=new Circle(140,50,40, Color.YELLOWGREEN);


        // 为圆对象设置鼠标事件处理
         //鼠标进入事件
        circle.setOnMouseEntered(e->{
            handle.label.setText("鼠标进入圆");
        });
        // 鼠标离开事件
        circle.setOnMouseExited(
                e->handle.label.setText("鼠标离开圆")
        );
        // 鼠标按压事件
        circle.setOnMousePressed(e->{
            handle.label.setText("鼠标被按下");
        });
        circle.setOnMouseDragged(e->{
            circle.setCenterX(e.getX());
            circle.setCenterY(e.getY());
        });

        Text text=new Text(300,220,"M");




        root.setLayoutX(100);
        root.setLayoutY(300);
//        root.setAlignment(Pos.CENTER);
        root.getChildren().addAll(handle.ok,handle.cancel,handle.label,circle,text);





        primaryStage.setScene(new Scene(root, 640, 480));
        primaryStage.show();
    }


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