java - 如何创建带圆角的 JButton 扩展？

Question

这是问题 "Java rounded Swing JButton" 的延续.我已经搜索了 javax.swing.JButton 的扩展，它将继承所有运行时行为并且只是覆盖角的绘制。

使用 noah.w 给出的代码在 sun forums page结果如下所示:

我希望能够在背景中有相同的渐变，在鼠标悬停时发生变化等。有人知道该怎么做吗？

从图片创建 Java Swing 窗口的代码是:

public class XrButton extends JButton implements MouseListener {

    private static final long serialVersionUID = 9032198251140247116L;

    String text;
    boolean mouseIn = false;

    public XrButton(String s) {
        super(s);
        text = s;
        setBorderPainted(false);
        addMouseListener(this);
        setContentAreaFilled(false);
    }

    @Override
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        if (getModel().isPressed()) {
            g.setColor(g.getColor());
            g2.fillRect(3, 3, getWidth() - 6, getHeight() - 6);
        }
        super.paintComponent(g);

        if (mouseIn)
            g2.setColor(Color.red);
        else
            g2.setColor(new Color(128, 0, 128));

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setStroke(new BasicStroke(1.2f));
        g2.draw(new RoundRectangle2D.Double(1, 1, (getWidth() - 3),
                (getHeight() - 3), 12, 8));
        g2.setStroke(new BasicStroke(1.5f));
        g2.drawLine(4, getHeight() - 3, getWidth() - 4, getHeight() - 3);

        g2.dispose();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().setLayout(new FlowLayout());

        XrButton xrButton = new XrButton("XrButton");
        JButton jButton = new JButton("JButton");

        frame.getContentPane().add(xrButton);

        frame.getContentPane().add(jButton);

        frame.setSize(150, 150);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public void mouseClicked(MouseEvent e) {
    }

    public void mouseEntered(MouseEvent e) {
        mouseIn = true;
    }

    public void mouseExited(MouseEvent e) {
        mouseIn = false;
    }

    public void mousePressed(MouseEvent e) {
    }

    public void mouseReleased(MouseEvent e) {
    }

Answer 1

我认为您在这里有 2 个选择:

1.在你的组件的paint方法中实现你自己的绘制

2.为您的外观和感觉创建新的 ButtonUI。在这种情况下，我建议使用 Synch LAF

在这两种情况下绘制不同的状态是你的责任