java - 如何使用changelistener监视鼠标位置y的变化？

我希望通过将changelistener附加到整数来实现此目标
（mouse.x）。但是getPointerInfo（）。getLocation（）;一旦初始化。之后，位置不会更新。如何使这些变更侦听器在值的更改上起作用？

也许有更好的方法可以做到这一点。任何帮助表示赞赏。

public class TheMidiApp extends Application {

@Override
public void start(Stage stage) throws Exception {
Point mouse = java.awt.MouseInfo.getPointerInfo().getLocation();
System.out.println("MouseX " + mouse.x);
System.out.println("MouseY " + mouse.y);

//Changelistener X
IntegerProperty changeValueMouseX = new SimpleIntegerProperty(mouse.x);
changeValueMouseX.addListener(new ChangeListener<Number>(){
    @Override
    public void changed(ObservableValue <? extends Number> observableValue, Number oldValue, Number newValue){
        System.out.println("OLD MOUSE X VALUE: " + oldValue);
        System.out.println("NEW MOUSE X VALUE: " + newValue);
    }
});

//Changelistener Y
IntegerProperty changeValueMouseY = new SimpleIntegerProperty(mouse.y);
changeValueMouseX.addListener(new ChangeListener<Number>(){
    @Override
    public void changed(ObservableValue <? extends Number> observableValue, Number oldValue, Number newValue){
        System.out.println("OLD MOUSE Y VALUE: " + oldValue);
        System.out.println("NEW MOUSE Y VALUE: " + newValue);
    }
});

MouseX = mouse.x;
MouseY = mouse.y;

最佳答案

您在根节点上需要一个侦听器。

public class JavaFXApplication29 extends Application {

    @Override
    public void start(Stage primaryStage) {


        AnchorPane root = new AnchorPane();
        Scene scene = new Scene(root, 500, 500);

        root.setOnMouseMoved(new EventHandler<MouseEvent>(){
            @Override
            public void handle(MouseEvent event) {
                System.out.println("mouse X: " + event.getX());
                System.out.println("mouse Y: " + event.getY());
            }
        });

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

关于java - 如何使用changelistener监视鼠标位置y的变化？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40848902/