为什么我的自定义按钮不起作用？

Question

所以我制作了自定义按钮（是的，我没有使用 JButtons 是有原因的）但由于某些原因它们无法正常工作。我相信这与我使用的 MouseAdapter 有关，但我不能肯定地说。澄清一下，我已经创建了按钮的视觉效果，并且可以正常工作，但由于某种原因点击不起作用。如您所见，我已经放入了调试代码，但它也没有打印出来。这是我的代码：

J面板：

package com.kraken.towerdefense.graphics;

import com.kraken.towerdefense.TowerDefense;
import com.kraken.towerdefense.scene.Scene;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.RoundRectangle2D;

public class Screen extends JPanel implements Runnable {

    Thread thread = new Thread(this);

    private int FPS = 0;

    public Scene scene;

    TowerDefense tD;

    private boolean running = false;

    public RoundRectangle2D.Float playGame, quitGame;
    public boolean playGameHighlighted, quitGameHighlighted;

    @Override
    public void run() {
        long lastFrame = System.currentTimeMillis();
        int frames = 0;

        running = true;

        while (running) {
            repaint();

            frames++;

            if (System.currentTimeMillis() - 1000 >= lastFrame) {
                FPS = frames;
                frames = 0;

                lastFrame = System.currentTimeMillis();
            }
        }

        System.exit(0);
    }

    public Screen(TowerDefense tD) {
        thread.start();

        addMouseMotionListener(new MouseAdapter() {

            @Override
            public void mouseMoved(MouseEvent e) {
                playGameHighlighted = playGame.contains(e.getPoint());
                quitGameHighlighted = quitGame.contains(e.getPoint());
                repaint();
            }

            @Override
            public void mousePressed(MouseEvent e) {
                if (playGameHighlighted) {
                    scene = Scene.GAME;
                    repaint();

                    System.out.println("playGameHighlighted and mouse clicked");
                }

                if (quitGameHighlighted) {
                    running = false;

                    System.out.println("quitGameHighlighted and mouse clicked");
                }

                System.out.println("mouse clicked");
            }
        });

        this.tD = tD;
        scene = Scene.MENU;

        setBackground(new Color(217, 217, 217));
    }

    @Override
    public void paintComponent(Graphics g2) {
        super.paintComponent(g2);

        playGame = new RoundRectangle2D.Float((getWidth() / 2) - 200, (getHeight() / 2) - 100, 400, 100, 10, 10);
        quitGame = new RoundRectangle2D.Float((getWidth() / 2) - 200, (getHeight() / 2) + 20, 400, 100, 10, 10);

        Graphics2D g = (Graphics2D) g2.create();
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        g.clearRect(0, 0, getWidth(), getHeight());

        g.drawString("FPS: " + FPS, 10, 10);

        if (scene == Scene.MENU) {
            if (playGameHighlighted) {
                g.setColor(new Color(255, 152, 56));
            } else {
                g.setColor(new Color(4, 47, 61));
            }
            g.fill(playGame);

            if (quitGameHighlighted) {
                g.setColor(new Color(255, 152, 56));
            } else {
                g.setColor(new Color(4, 47, 61));
            }
            g.fill(quitGame);

            g.setColor(Color.WHITE);
            g.setFont(new Font("Gisha", Font.PLAIN, 20));
            g.drawString("Play", (getWidth() / 2) - (g.getFontMetrics().stringWidth("Play") / 2), (getHeight() / 2) - 45);
            g.drawString("Quit", (getWidth() / 2) - (g.getFontMetrics().stringWidth("Quit") / 2), (getHeight() / 2) + 75);

            g.setColor(Color.BLACK);
            g.setFont(new Font("Gisha", Font.PLAIN, 30));
            g.drawString("Tower Defense Menu", (getWidth() / 2) - (g.getFontMetrics().stringWidth("Tower Defense Menu") / 2), (getHeight() / 4) - 15);
            g.draw(playGame);
            g.draw(quitGame);
        }
    }
}

JFrame:

package com.kraken.towerdefense;

import com.kraken.towerdefense.graphics.Screen;

import javax.swing.*;

public class TowerDefense extends JFrame {

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

    public TowerDefense() {
        setExtendedState(MAXIMIZED_BOTH);
        setUndecorated(true);
        setTitle("Tower Defense");

        setDefaultCloseOperation(EXIT_ON_CLOSE);

        setResizable(false);

        Screen screen = new Screen(this);
        this.add(screen);

        setVisible(true);
    }

}

场景枚举：

package com.kraken.towerdefense.scene;

public enum Scene {
    MENU,
    GAME
}

这就是我的代码，如有任何帮助，我们将不胜感激。谢谢！

Answer 1

MouseMotionListener只会监听某一组鼠标事件，为了得到鼠标点击事件的通知，需要使用MouseListener.

幸运的是，使用 MouseAdapter 非常容易...

MouseAdapter ma = new MouseAdapter() {

    @Override
    public void mouseMoved(MouseEvent e) {
        playGameHighlighted = playGame.contains(e.getPoint());
        quitGameHighlighted = quitGame.contains(e.getPoint());
        repaint();
    }

    @Override
    public void mousePressed(MouseEvent e) {
        if (playGameHighlighted) {
            scene = Scene.GAME;
            repaint();

            System.out.println("playGameHighlighted and mouse clicked");
        }

        if (quitGameHighlighted) {
            running = false;

            System.out.println("quitGameHighlighted and mouse clicked");
        }

        System.out.println("mouse clicked");
    }
};
addMouseMotionListener(ma);
addMouseListener(ma);

仔细查看 How to Write a Mouse Listener 了解更多详情

为什么我的自定义按钮不起作用？

Why are my custom buttons not working?

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mouselistener