[FIXED] JavaFX 18.0.1 + Windows 11 + JDK 18.0.1.1: Canvas - cannot trigger the touch screen events

Issue

My setup:

• JavaFX SDK 18.0.1
• Windows 11
• JDK 18.0.1.1
• A screen with the touch support

When I try a simple program, none of the touch events are triggered upon touch gestures. My test app follows.

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.input.TouchEvent;
import javafx.stage.Stage;

public class JavaFXSandbox extends Application {

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

    @Override
    public void start(Stage stage) throws Exception {
        Group root = new Group();
        Scene scene = new Scene(root, 600, 600);

        Canvas canvas = new Canvas(600, 600);
        root.getChildren().add(canvas);

        stage.addEventFilter(TouchEvent.ANY, e -> System.out.println("touch event: " + e));

        stage.setScene(scene);
        stage.show();
    }
}

Is there any way of circumventing the issue, or am I misusing the JavaFX API?

Solution

After playing a bit with JavaFX, I found out that touch events are converted to mouse events such, that it's possible to simulate touch events in mouse listeners.

Answered By - coderodde
Answer Checked By - Senaida (JavaFixing Volunteer)