在Java窗口中捕获(捕获)鼠标光标 [英] Capture (trap) the mouse cursor in a window in Java

问题描述

我正在寻找一种方法，将进入到该窗口的鼠标捕获或捕获到该窗口中，就像将鼠标捕获在虚拟机窗口中一样，直到用户按CTRL + ALT + DEL或在某些情况下释放鼠标其他方式.如何在Java中做到这一点?全屏模式不是一种选择.

I am looking for a way to capture or trap the mouse in a window after it has entered that window much like a mouse is trapped in a virtual machine window until a user presses CTRL+ALT+DEL or release the mouse in some other manner. How do I make this happen in Java? Going full screen is not an option.

这里有一些SSCCE.此代码会将您的鼠标捕获在窗口中.要想摆脱困境，您只需要在生成的框架内直接移至关闭按钮即可.如果您会注意到鼠标试图离开的时间，它会自动返回到(0,0).我需要知道的是如何使它返回到其离开的坐标.我尝试用getX()和getY()代替(0,0)，但是机器人没有将鼠标移回那里(我认为响应时间很慢).我还让机器人将鼠标移回了crosshair.x和crosshair.y，但是(在其他情况下)如果用户在适当的时候单击鼠标，它仍然可以使鼠标退出.有什么想法吗?

Here is some SSCCE for ya. This code will trap your mouse in the window. To get out you just have to within the generated frame and move directly to the close button. If you will notice when your mouse tries to leave it automatically goes back to (0,0). What I need to know is how do I get it to go back to the coordinates where it exited from. I tried getX() and getY() in place of (0,0) but the robot does not return the mouse there (I think the response time is to slow). I also have had the robot move the mouse back to crosshair.x and crosshair.y but this (as well as the others) still allows the mouse to escape if the user clicks at the right moment. Any thoughts?

主类:

import java.awt.AWTException;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferStrategy;
import java.awt.image.MemoryImageSource;
import java.awt.Point;
import java.awt.Robot;
import java.awt.Toolkit;
import javax.swing.JFrame;

public class Game extends JFrame implements MouseMotionListener, MouseListener{

    private int windowWidth = 640;
    private int windowHeight = 480;
        private Crosshair crosshair;

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

    public Game() {
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(windowWidth, windowHeight);
        this.setResizable(false);
        this.setLocation(0,0);
        this.setVisible(true);

        this.createBufferStrategy(2);
                addMouseMotionListener(this);
                addMouseListener(this);
        initGame();

        while(true) {
            long start = System.currentTimeMillis();
            gameLoop();
            while(System.currentTimeMillis()-start < 5) {
                            //empty while loop
            }
        }
    }

    private void initGame() {
            hideCursor();
            crosshair = new Crosshair (windowWidth/2, windowHeight/2);
    }

        private void gameLoop() {
            //game logic
            drawFrame();
        }

        private void drawFrame() {

            BufferStrategy bf = this.getBufferStrategy();
            Graphics g = (Graphics)bf.getDrawGraphics();
            try {
                g = bf.getDrawGraphics();
                Color darkBlue = new Color(0x010040);
                g.setColor(darkBlue);
                g.fillRect(0, 0, windowWidth, windowHeight);
                drawCrossHair(g);
            } finally {
                g.dispose();
            }
            bf.show();
            Toolkit.getDefaultToolkit().sync();
        }

        private void drawCrossHair(Graphics g){
            Color yellow = new Color (0xEDFF62);
            g.setColor(yellow);
            g.drawOval(crosshair.x, crosshair.y, 40, 40);

            g.fillArc(crosshair.x + 10, crosshair.y + 21 , 20, 20, -45, -90);
            g.fillArc(crosshair.x - 1, crosshair.y + 10, 20, 20, -135, -90);
            g.fillArc(crosshair.x + 10, crosshair.y - 1, 20, 20, -225, -90);
            g.fillArc(crosshair.x + 21, crosshair.y + 10, 20, 20, -315, -90);
        }

        @Override
        public void mouseDragged(MouseEvent e) {
        //empty method
        }

        @Override
        public void mouseMoved(MouseEvent e) {
        crosshair.x = e.getX();
        crosshair.y = e.getY();
        }

        private void hideCursor() {
            int[] pixels = new int[16 * 16];
            Image image = Toolkit.getDefaultToolkit().createImage(new MemoryImageSource(16, 16, pixels, 0, 16));
            Cursor transparentCursor = Toolkit.getDefaultToolkit().createCustomCursor(image, new Point(0, 0), "invisiblecursor");
            getContentPane().setCursor(transparentCursor);
    }

        public void mouseExited(MouseEvent e) {
            System.out.println("Event: " + e);
            try {
                Robot robot = new Robot();
                robot.mouseMove(0, 0);// When I use (getX(),getY()) instead of (0,0) the robot will not move the mouse at all even though getX() and getY() are the coordinates I want the mouse to be moved to.  Also the mouse can still escape, even when crosshair.x and crosshair.y are used as the coordinates.  It seems that robot is too slow.
            }
            catch (AWTException ex) {
                ex.printStackTrace();
            }
        }

        public void mouseEntered(MouseEvent e){
        }

        public void mousePressed(MouseEvent e) {
        }

        public void mouseReleased(MouseEvent e) {
        }

        public void mouseClicked(MouseEvent e) {
        }
}

另一个班级:

public class Crosshair{
        public int x;
    public int y;
    public Crosshair(int x, int y) {
        this.x = x;
        this.y = y;
        }
}

推荐答案

我想您可以使用

I guess you could use a Global Event Listener to listen for mouse entered events for the frame. Then on a mouse exited event I suppose you could use the Robot to reset the location of the mouse once it leaves the frame.

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