JButton 式样自定义

最新推荐文章于 2023-10-18 11:58:52 发布

Dulcie_y

最新推荐文章于 2023-10-18 11:58:52 发布

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分类专栏： swing source 文章标签： swing jbutton paint

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本文介绍了如何通过paint()方法在JButton上实现自定义样式，包括调整按钮的正常状态、鼠标悬停状态及按下状态的渐变背景颜色和透明度。通过设置透明度参数alpha，利用GradientPaint绘制不同渐变效果，同时运用AlphaComposite调整绘制顺序，最终达到美观且个性化的按钮外观。

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JButton式样的修改，包括按钮的正常状态、鼠标悬停状态以及按下状态，且不使用背景图片修改，依靠paint（）渲染。

相关代码：

public class MyButton extends JButton {
    private float alpha = 1f; // 底色的透明度，默认为不透明
    private int isMouseEntered = 1;// 鼠标是否进入按钮

    public MyButton() {
        initStyle();

    }

    public MyButton(String buttonText) {
        super(buttonText);
        initStyle();
        //添加鼠标监听
        addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                //当鼠标进入时,鼠标进入状态改为TRUE，并重绘按钮
                isMouseEntered = 0;
                repaint();
                super.mouseEntered(e);
            }
            @Override
            public void mouseExited(MouseEvent e) {
                isMouseEntered = 1;
                repaint();
            }
            @Override
            public void mousePressed(MouseEvent arg0) {
                isMouseEntered = 2;
                repaint();
            }
            @Override
            public void mouseReleased(MouseEvent e) {
                isMouseEntered = 0;
                repaint();
            }

        });

    }

    /**
     * 初始化按钮样式
     */
    private void initStyle() {
        //初始化透明按钮
        setOpaque(false);
        setBorder(null);
//      setBorderPainted(false);
        setFocusable(false);

        setBackground(null);
//      setFocusPainted(false);
        setContentAreaFilled(false);

    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;

        // 绘制渐变底色
        switch(isMouseEntered) {
        case 0:
            AlphaComposite composite = AlphaComposite.getInstance(
                    AlphaComposite.SRC_OVER, alpha);
            g2.setComposite(composite);
            drawButtonBackground(g2, this, Color.decode("#E0F1FC"), Color.decode("#DEEBFE"), 
                    Color.decode("#D6E5F5"), Color.decode("#FFFFFF"));
            break;
        case 1:

            break;
        case 2:
            AlphaComposite composite1 = AlphaComposite.getInstance(
                    AlphaComposite.SRC_OVER, alpha);
            g2.setComposite(composite1);
//          drawButtonBackground(g2, this, Color.decode("#D6E5F5"), Color.decode("#FFFFFF"), 
//                  Color.decode("#FFFFFF"), Color.decode("#D6E5F5"));
            drawButtonPressBackground(g2, this, Color.decode("#D6E5F5"), Color.decode("#EFF5FE"), 
                    Color.decode("#EFF5FE"), Color.decode("#D6E5F5"));
        default:
            break;
        }
         super.paintComponent(g);

    }

    private static void drawButtonBackground(Graphics2D g2, JToggleButton bt,
            Color c1, Color c2, Color c3, Color c4) {

        // 使平滑
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        // 造一个圆角区域
        RoundRectangle2D.Float r2d = new RoundRectangle2D.Float(0, 0,
                bt.getWidth() - 1, bt.getHeight() - 1, 10, 10);
        Shape clip = g2.getClip();
        g2.clip(r2d);
        g2.setClip(clip);

        g2.setColor(Color.decode("#afafaf"));
        g2.drawRoundRect(0, 0, bt.getWidth() - 2, bt.getHeight() - 1, 10, 10);

        // 渐变背景
        g2.setPaint(new GradientPaint(2, 2, c1, 1, bt.getHeight() / 3, c2));
        g2.fillRoundRect(2, 2, bt.getWidth() - 5, bt.getHeight() / 3, 10, 10);
        // 渐变二段
        g2.setPaint(new GradientPaint(1, bt.getHeight() / 3, c3, 1, bt
                .getHeight(), c4));
        g2.fillRoundRect(2, bt.getHeight() / 3, bt.getWidth() - 5,
        bt.getHeight() / 3 * 2 - 1, 10, 10);

//      g2.dispose();

    }

    private static void drawButtonPressBackground(Graphics2D g2, JToggleButton bt,
            Color c1, Color c2, Color c3, Color c4) {

        // 使平滑
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        // 造一个圆角区域
        RoundRectangle2D.Float r2d = new RoundRectangle2D.Float(0, 0,
                bt.getWidth() - 1, bt.getHeight() - 1, 10, 10);
        Shape clip = g2.getClip();
        g2.clip(r2d);
        g2.setClip(clip);

        // 外边框
        g2.drawRoundRect(0, 0, bt.getWidth() - 2, bt.getHeight() - 1, 10, 10);

        // 渐变背景
        g2.setPaint(new GradientPaint(1, bt.getHeight()/7, c1, 1, bt.getHeight() / 3, c2));
        g2.fillRect(2, 2, bt.getWidth() - 5, bt.getHeight() / 3);
        // 渐变二段
        g2.setPaint(new GradientPaint(1, bt.getHeight() / 3, c3, 1, bt
                .getHeight(), c4));
        g2.fillRect(2, bt.getHeight() / 3, bt.getWidth() - 5,
                bt.getHeight() / 3 * 2 - 1);

        // 内边框
        g2.setColor(Color.decode("#afafaf"));
        g2.drawRoundRect(1, 1, bt.getWidth() - 3, bt.getHeight() - 2, 9, 9);
        g2.drawRoundRect(2, 2, bt.getWidth() - 4, bt.getHeight() - 3, 8, 8);
        g2.setColor(Color.decode("#cfcfcf"));
        g2.drawRoundRect(2, 3, bt.getWidth() - 4, bt.getHeight() - 4, 8, 7);

    }
}