java在Windows上移动父阶段时移动子阶段

Question

我想知道，当我们在Windows上移动父阶段时，是否有办法将JavaFX子阶段与其父阶段一起移动。事实上，在MacOS上，这似乎是默认行为。正如你在这段视频中看到的：https://imgur.com/a/r3qIklu，我可以独立移动缩略图场景，当我移动主窗口时，缩略图（顺便说一句，它是主窗口的子场景）仍然“附加”到父窗口并跟随它

然而，在Windows上，正如您在这里看到的：https://imgur.com/a/SPEkYJ2，结果是不一样的。移动父阶段时，缩略图将保持在其当前位置。如何在Windows上重现MacOS的行为

以下是我的阶段的初始化方式，仅供参考：

public void start(Stage primaryStage) {
    //App's main stage
    Parent root = FXMLLoader.load(getClass().getResource("../spaception.fxml"));
    Scene scene = new Scene(root, 1400, 700);
    primaryStage.setScene(scene);
    primaryStage.show();
    //...

    //Child stage (Thumbnail)
    Parent thumbnailRoot = FXMLLoader.load(getClass().getResource("../thumbnail.fxml"));
    Stage thumbnailStage = new Stage();
    thumbnailStage.initOwner(primaryStage);
    thumbnailStage.initStyle(StageStyle.UNDECORATED);
    thumbnailStage.setX(primaryStage.getX()+1100);
    thumbnailStage.setY(primaryStage.getY()+540);
    Scene scene = new Scene(thumbnailRoot, 250, 145);
    thumbnailStage.setScene(scene);
    thumbnailStage.show();
}

Answer 1

将root和thumbnailRoot放在一个常规的Pane中（这相当于Swing中的空布局）

要允许用户移动thumbnailRoot，请向其添加鼠标事件处理程序以进行按下和拖动，并保留跟踪thumbnailRoot位置和鼠标拖动的专用字段

简单示例实现：

import javafx.application.Application;
import javafx.geometry.Bounds;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.MenuBar;
import javafx.scene.layout.Pane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseButton;

public class ParentAndThumbnail
extends Application {
    private Bounds thumbnailBoundsOnPress;

    private double pressedX;
    private double pressedY;

    @Override
    public void start(Stage stage) {
        Label positionLabel = new Label("Current position: x y");

        VBox left =
            new VBox(6, new Button("+"), new Button("-"), new Button("C"));
        left.setFillWidth(true);
        left.setPadding(new Insets(6));
        left.getChildren().forEach(
            c -> ((Button) c).setMaxWidth(Double.MAX_VALUE));

        VBox right =
            new VBox(6, new Button("+"), new Button("-"), new Button("C"));
        right.setFillWidth(true);
        right.setPadding(new Insets(6));
        right.getChildren().forEach(
            c -> ((Button) c).setMaxWidth(Double.MAX_VALUE));

        MenuBar menuBar = new MenuBar(
            new Menu("File", null,
                new MenuItem("New"),
                new MenuItem("Open"),
                new MenuItem("Save"),
                new MenuItem("Exit")),
            new Menu("Edit", null,
                new MenuItem("Cut"),
                new MenuItem("Copy"),
                new MenuItem("Paste")));

        ImageView imagePane =
            new ImageView(new Image("parent-stage-background.png"));

        BorderPane root = new BorderPane(
            imagePane, menuBar, left, positionLabel, right);

        BorderPane thumbnailRoot = new BorderPane(
            new ImageView(new Image("thumbnail-background.png")));
        thumbnailRoot.setStyle(
            "-fx-border-width: 4px 30px 4px 30px; " +
            "-fx-border-color: black");

        thumbnailRoot.setOnMousePressed(e -> {
            if (e.getButton() == MouseButton.PRIMARY) {
                thumbnailBoundsOnPress = thumbnailRoot.getBoundsInParent();
                pressedX = e.getScreenX();
                pressedY = e.getScreenY();
            }
        });
        thumbnailRoot.setOnMouseDragged(e -> {
            if (e.getButton() == MouseButton.PRIMARY) {
                thumbnailRoot.setLayoutX(
                    thumbnailBoundsOnPress.getMinX()
                    + e.getScreenX() - pressedX);
                thumbnailRoot.setLayoutY(
                    thumbnailBoundsOnPress.getMinY()
                    + e.getScreenY() - pressedY);
            }
        });

        Pane overlay = new Pane();
        overlay.getChildren().addAll(root, thumbnailRoot);

        stage.setOnShown(e -> {
            thumbnailRoot.setLayoutX(root.getWidth() - 400);
            thumbnailRoot.setLayoutY(root.getHeight() - 200);
        });

        stage.setScene(new Scene(overlay));
        stage.setTitle("Spaception");
        stage.show();
    }

    public static class Main {
        public static void main(String[] args) {
            Application.launch(ParentAndThumbnail.class, args);
        }
    }
}

您可以在一个应用程序中完成相同的功能。fxml文件：只需将背景和缩略图放在窗格中即可。如果愿意，也可以在那里添加鼠标事件处理程序

这是我用作舞台背景的图片。巴布亚新几内亚：

这是我用作缩略图背景的图像。巴布亚新几内亚：