CODEWITHSUNDEEP
javajavafxpositionmouse-cursor
Rolch2015
Rolch2015

Reputation: 1541

Retrieve mouse position in JavaFX without event

I want to retrieve the x and y coordinates of the current mouse position before showing a stage.

So far, the only way I found to get the mouse position in JavaFX is within a MouseEvent, which does not apply to my situation. Furthermore, I found the possibility to retrieve the position via java.awt.MouseInfo. This, however, I think is a bad idea (I use JavaFX not AWT) and, at least in my case, results in a HeadlessException.

Is there an other clean possibility to retrieve the mouse position in JavaFX without getting too hackish (e.g. simulating a MouseEvent just for getting the position)?

Thank you very much!

Upvotes: 4

Views: 2990

Answers (2)

Tharindu Sathischandra
Tharindu Sathischandra

Reputation: 2004

As @lambad suggested Robot class seems to be a decent way to achieve your need.

I think it is more appropiate to use JavaFX version of Robot which is javafx.scene.robot.Robot.

You could simply use getMousePosition() method which returns the current mouse (x,y) screen coordinates as a javafx.geometry.Point2D.

import javafx.scene.robot.Robot;

Robot robot = new Robot();

System.out.println("X is: " + robot.getMousePosition().getX());
System.out.println("Y is: " + robot.getMousePosition().getY());

Note: Robot objects must be constructed and used on the JavaFX Application Thread.

Upvotes: 1

lambad
lambad

Reputation: 1066

Well, you could get mouse coordinates using Robot class. Here is an example. 

com.sun.glass.ui.Robot robot =
                com.sun.glass.ui.Application.GetApplication().createRobot();

        int y = robot.getMouseY();
        System.out.println("y point = " + y);
        int x = robot.getMouseX();
        System.out.println("x point= " + x);

It tried it on linux (elementary OS) and it works.

Update: After some googling, I found TestFX which looks like an attempt to implement a prototype for Robot class. Have a look at links given below. https://github.com/TestFX/Robot http://mail.openjdk.java.net/pipermail/openjfx-dev/2015-December/018412.html

You can also do something like this, to get the coordinates.

public void start(Stage primaryStage) throws Exception {
        GlassRobot robot = new GlassRobotImpl();
        Point2D point = robot.getMouseLocation();
        double x = point.getX();
        double y = point.getY();
        System.out.println("y = " + y);
        System.out.println("x = " + x);
        if(x > 10) {
              primaryStage.show();
       }
public static void main(String[] args) {
        launch(args);
    }

Upvotes: 5

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