Swing/RoundedTextField のバックアップ(No.12)

  • title: JTextFieldの角を丸める tags: [JTextField, Border, Shape] author: aterai pubdate: 2010-10-04T21:07:50+09:00 description: JTextFieldの角を丸めて表示するようBorderを設定しています。 hreflang: 
       href: http://java-swing-tips.blogspot.com/2012/03/rounded-border-for-jtextfield.html
   lang: en

概要

JTextFieldの角を丸めて表示するようBorderを設定しています。

Screenshot

screenshot

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サンプルコード

JTextField textField01 = new JTextField(20) {
  //Unleash Your Creativity with Swing and the Java 2D API!
  //http://web.archive.org/web/20091205092230/http://java.sun.com/products/jfc/tsc/articles/swing2d/index.html
  @Override protected void paintComponent(Graphics g) {
    if (!isOpaque()) {
      int w = getWidth();
      int h = getHeight();
      Graphics2D g2 = (Graphics2D) g.create();
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                          RenderingHints.VALUE_ANTIALIAS_ON);
      g2.setColor(UIManager.getColor("TextField.background"));
      g2.fillRoundRect(0, 0, w - 1, h - 1, h, h);
      g2.setColor(Color.GRAY);
      g2.drawRoundRect(0, 0, w - 1, h - 1, h, h);
      g2.dispose();
    }
    super.paintComponent(g);
  }
};
textField01.setOpaque(false);
textField01.setBackground(new Color(0, 0, 0, 0)); //Nimbus
textField01.setBorder(BorderFactory.createEmptyBorder(4, 8, 4, 8));
textField01.setText("aaaaaaaaaaa");
View in GitHub: Java, Kotlin

解説

  • 下
    • RoundedCornerBorderを設定
class RoundedCornerBorder extends AbstractBorder {
  @Override public void paintBorder(
      Component c, Graphics g, int x, int y, int width, int height) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    int r = height - 1;
    RoundRectangle2D round = new RoundRectangle2D.Float(
        x, y, width - 1, height - 1, r, r);
    Container parent = c.getParent();
    if (parent != null) {
      g2.setColor(parent.getBackground());
      Area corner = new Area(new Rectangle2D.Float(x, y, width, height));
      corner.subtract(new Area(round));
      g2.fill(corner);
    }
    g2.setColor(Color.GRAY);
    g2.draw(round);
    g2.dispose();
  }
  @Override public Insets getBorderInsets(Component c) {
    return new Insets(4, 8, 4, 8);
  }
  @Override public Insets getBorderInsets(Component c, Insets insets) {
    insets.set(4, 8, 4, 8);
    return insets;
  }
}

参考リンク

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