创建一个忽略鼠标和按键事件的JavaFX透明窗口 [英] Creating a JavaFX transparent window that ignores mouse and key events

问题描述

我想制作一个JavaFX应用程序，该应用程序基本上用Canvas对象覆盖整个用户屏幕，因此基本上我可以在用户屏幕上绘制任何东西.

I want to make a JavaFX application that basically overlays the entire user screen with a Canvas object, so basically I can draw anything on the user's screen.

制作一个覆盖整个屏幕的窗口很简单.可以通过以下教程实现使其基本透明: https://assylias.wordpress.com /2013/12/08/383/

Making a window that covers the whole screen is simple. Making it essentially transparent can be achieved with this tutorial: https://assylias.wordpress.com/2013/12/08/383/

所以阻止我的唯一一件事是，很明显，尽管窗口是透明的，它仍然可以捕获用户的鼠标和按键事件.

So the one and only thing stopping me is the fact that obviously, the window, albeit being transparent it will still capture user mouse and key events.

有没有办法可以做到这一点?举一个更具体的例子，想象一下我想在用户鼠标光标的任何地方画一个红色圆圈，但是用户输入不会被打断.

Is there a way I can achieve this? For a more concrete example, imagine I want to make a red circle surround the user's mouse cursor wherever it goes, but the user input will not be interrupted.

推荐答案

在 plain JavaFX中无法实现所需的功能.

What you want isn't possible in plain JavaFX.

您可以查看我的答案

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.

使Canvas为半透明会捕获所有事件，但是您可以看到基础窗口.但是当您具有完全透明的Canvas时，您的应用程序将不会捕获任何事件.

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.

但是，您的具体示例"可以通过其他方式解决.这是代码:

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);
    }
}

这至少解决了我想在用户鼠标光标所在的位置上画一个红色圆圈，但用户输入不会被打断"

注意:此处AWT类与FX类混合在一起.您可能需要使用EDT& FX线程处理.它确实可以正常工作.

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

屏幕截图:

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