java如何在javafx中基于时间更改场景

Question

java和JavaFX新手，请耐心听我说

我需要做一个5个3d水果模型的演示，以连续循环的方式显示，间隔15秒：水果1 15秒，然后水果2 15秒，广告等等。。持续15秒直到结果5，然后返回到结果1并继续，直到我按下ESC键，该键应关闭窗口

我也明白，最好是更改组成场景的根组对象，而不是更改场景，所以我在代码中更改了这一点

我知道需要一个时间线，以便在场景播放时改变场景中的某些内容，但我尝试了类似于此answer所述的内容，但我不了解如何每15秒切换场景根的逻辑

更新：

我放弃了时间轴选项，找到了平台。运行选项，如article上所示，当我看到窗口从场景数组中的第一个水果迭代到第二个水果时，它似乎起作用，但我不确定为什么它只在我需要每15秒运行一次时运行一次，这意味着我的场景切换器：nextSceneIndex（）应该在1和0之间来回运行

更新2：

我回到时间表的建议，我实施了塞德里克的解决方案，它奏效了。。。我再高兴不过了：）

这是我的工作代码

  public void start(Stage stage) throws Exception {

        BorderPane[] scenes = new BorderPane[]{createSceneApple(),createSceneCarrot(),createSceneTomato()};


        Timeline tl = new Timeline();
        tl.setCycleCount(Animation.INDEFINITE);
        KeyFrame kf_fruit = new KeyFrame(Duration.seconds(10),
                new EventHandler<ActionEvent>() {
                    public void handle(ActionEvent event) {

                       if (index==0){
                           root.getChildren().setAll(scenes[0]);
                           index = 1;
                       }else if(index==1){
                           root.getChildren().setAll(scenes[1]);
                           index = 2;
                       }else if(index==2){
                           root.getChildren().setAll(scenes[2]);
                           index = 0;
                       }
                    }  
        });

        tl.getKeyFrames().add(kf_fruit);
        tl.play();

        Scene scene = new Scene(root, windowWidth, windowHeight);
        stage.setScene(scene);
        stage.show();

}

Answer 1

也许你可以从这里得到一些想法。这使用了我在上面发布的链接中的代码Timeline用于循环浏览Shape列表和有关该形状的信息

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 * JavaFX App
 */
public class App extends Application {

    @Override
    public void start(Stage stage) {
        List<MyShape> shapes = new ArrayList();
        shapes.add(new MyShape("Circle", "Shape.Circle", "More Circle Info", new Circle(25, Color.BLUE)));
        shapes.add(new MyShape("Rectangle", "Shape.Rectangle", "More Rectangle Info", new Rectangle(100, 50, Color.RED)));
        shapes.add(new MyShape("Line", "Shape.Line", "More Line Info", new Line(0, 0, 100, 100)));


        TextField tf1 = new TextField();
        TextField tf2 = new TextField();
        TextArea ta1 = new TextArea();        
        VBox leftWindow = new VBox(tf1, tf2, ta1);

        StackPane rightWindow = new StackPane(shapes.get(1).getShape());

        AtomicInteger counter = new AtomicInteger();
        Timeline timeline = new Timeline(new KeyFrame(Duration.seconds(1), new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                System.out.println(counter.get() % shapes.size());
                MyShape currentShape = shapes.get(counter.getAndIncrement() % shapes.size());
                tf1.setText(currentShape.getName());
                tf2.setText(currentShape.getType());
                ta1.setText(currentShape.getMoreInfo());
                rightWindow.getChildren().set(0, currentShape.getShape());
            }
        }));
        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.play();

        BorderPane root = new BorderPane();
        root.setLeft(new StackPane(leftWindow));
        root.setRight(rightWindow);

        var scene = new Scene(root, 640, 480);
        stage.setScene(scene);
        stage.show();
    }

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

}

更新： 如果你只有两个场景，这就简化了一些事情。基本上需要设置初始视图。然后，您需要每两秒钟切换一次当前显示的视图。（我用了两秒钟，这样你就可以在视图被关闭之前看到它们）。我创建了自己版本的createSceneCarrot和createSceneApple，因为我不知道您的实现

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 * JavaFX App
 */
public class App extends Application {

    @Override
    public void start(Stage stage) {
        BorderPane[] scenes = new BorderPane[]{createSceneApple(),createSceneCarrot()};


        StackPane root = new StackPane(scenes[0]);//Set initial view;      

        Timeline timeline = new Timeline(new KeyFrame(Duration.seconds(2), (ActionEvent event) -> {
            if(root.getChildren().get(0).equals(scenes[0]))//If the first scene is loaded, load the second scene.
            {
                root.getChildren().set(0, scenes[1]);
            }
            else
            {
                root.getChildren().set(0, scenes[0]);
            }
        }));
        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.play();

        var scene = new Scene(root, 640, 640);
        stage.setScene(scene);
        stage.show();
    }

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

    public BorderPane createSceneApple()
    {
        BorderPane borderPane = new BorderPane();

        TextField tf1 = new TextField("Rectangle 1");
        TextField tf2 = new TextField("Rectangle Color: Blue");
        TextArea ta1 = new TextArea("20x40");        
        VBox leftWindow = new VBox(tf1, tf2, ta1);
        borderPane.setLeft(leftWindow);

        StackPane rightWindow = new StackPane(new Rectangle(20, 40, Color.BLUE));
        borderPane.setRight(rightWindow);

        return  borderPane;
    }

    public BorderPane createSceneCarrot()
    {
        BorderPane borderPane = new BorderPane();

        TextField tf1 = new TextField("Circle 1");
        TextField tf2 = new TextField("Circle Color: Blue");
        TextArea ta1 = new TextArea("Radius: 50");        
        VBox leftWindow = new VBox(tf1, tf2, ta1);
        borderPane.setLeft(leftWindow);

        StackPane rightWindow = new StackPane(new Circle(50, Color.RED));
        borderPane.setRight(rightWindow);

        return  borderPane;
    }
}