Raspberry Pi Can't Hide Mouse Cursor in Javafx Application

Creating a JavaFX transparent window that ignores mouse and key events

What you want isn't possible in plain JavaFX.

You can check out my answer here, that's the closest thing. But you can't overlay a transparent canvas over the entire desktop and forward the mouse events to the underlying windows.

Having the Canvas semi-transparent would catch all events, but you could see the underlying windows. But when you have the Canvas fully transparent, your application wouldn't catch any events.

However, your "concrete example" could be solved in a different way. Here's the code:

import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.PointerInfo;

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class CircleAroundCursor extends Application {

    double radius = 50;

    @Override
    public void start(Stage primaryStage) {

        Group root = new Group();

        Circle circle = new Circle( radius * 2,radius * 2,radius);
        circle.setStroke(Color.RED);
        circle.setFill(Color.TRANSPARENT);

        root.getChildren().add(circle);

        Scene scene = new Scene(root, Color.TRANSPARENT);

        scene.getRoot().setStyle("-fx-background-color: transparent");

        primaryStage.initStyle(StageStyle.TRANSPARENT);
        primaryStage.setScene(scene);
        primaryStage.show();
        primaryStage.setAlwaysOnTop(true);


        AnimationTimer loop = new AnimationTimer() {

            @Override
            public void handle(long now) {

                PointerInfo info = MouseInfo.getPointerInfo();
                Point p = info.getLocation();

                primaryStage.setX(p.getX() - radius * 2);
                primaryStage.setY(p.getY() - radius * 2);

            }
        };
        loop.start();
    }

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

This at least solves "I want to make a red circle surround the user's mouse cursor wherever it goes, but the user input will not be interrupted"

Note: Here AWT classes are mixed with FX classes. You may need to use an EDT & FX thread handling. It does work without though.

Screenshot:

JavaFX: how to set tooltip location relative to the mouse cursor?

Although the question is a little bit old,but remains unanswered.

1. Part 1

What about something that is using Button current position in screen
and set the tooltip position accordingly?

Button button = new Button();
button.setTooltip(new Tooltip("Hey i am a Button"));
button.getTooltip().setOnShowing(s->{

    //Get button current bounds on computer screen
    Bounds bounds = button.localToScreen(button.getBoundsInLocal());
    button.getTooltip().setX(bounds.getMaxX());
    button.getTooltip().setY(bounds.getMinY());

});

2. Part 2

(You can do also with mouse but add somewhere a mouseMoveListener,in
the example it is added on the Button but i would prefer to add it on
the Stage Scene if we are speaking about a lot of Button)

    double currentMouseX;
    double currentMouseY;
    button.setOnMouseMoved(m->{
        currentMouseX=m.getScreenX();
        currentMouseY=m.getScreenY();
    });

    button.getTooltip().setOnShowing(s->{       
        button.getTooltip().setX(currentMouseX+button.getTooltip().getWidth()+5);
        button.getTooltip().setY(currentMouseY);                
    });

Finnaly:

Actually in the IDE you are using type button.getTooltip().setOn.. and you will see all the available methods that you can use to control tooltip before and after showing or hiding.

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