JTextFieldの角を丸める
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Posted by aterai at
Last-modified:
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
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サンプルコード
JTextField textField01 = new JTextField(20) {
@Override protected void paintComponent(Graphics g) {
if (!isOpaque()) {
int w = getWidth() - 1;
int h = getHeight() - 1;
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(UIManager.getColor("TextField.background"));
g2.fillRoundRect(0, 0, w, h, h, h);
g2.setPaint(Color.GRAY);
g2.drawRoundRect(0, 0, w, h, h, h);
g2.dispose();
}
super.paintComponent(g);
}
@Override public void updateUI() {
super.updateUI();
setOpaque(false);
setBorder(BorderFactory.createEmptyBorder(4, 8, 4, 8));
}
};
View in GitHub: Java, Kotlin解説
- 上:
Override: JTextField#paintComponent(...)
JTextField#paintComponent(...)
をオーバーライドBorder
をEmptyBorder
に変更JTextField#setOpaque(false)
を設定- 参考: Unleash Your Creativity with Swing and the Java 2D API!
- 背景が画像などの場合でも角丸が描画可能
- 下:
setBorder(new RoundedCornerBorder())
RoundedCornerBorder
を設定角を親コンポーネントの背景色で上書きしているので、背景が画像などの場合はその上に角が描画されてしまうJTextField
の縁と背景を透明化し、RoundedCornerBorder
から取得した図形を描画するように修正JTextField textField02 = new JTextField(20) { @Override protected void paintComponent(Graphics g) { if (!isOpaque() && getBorder() instanceof RoundedCornerBorder) { Graphics2D g2 = (Graphics2D) g.create(); g2.setPaint(getBackground()); g2.fill(((RoundedCornerBorder) getBorder()).getBorderShape( 0, 0, getWidth() - 1, getHeight() - 1)); g2.dispose(); } super.paintComponent(g); } @Override public void updateUI() { super.updateUI(); setOpaque(false); setBorder(new RoundedCornerBorder()); } }; class RoundedCornerBorder extends AbstractBorder { private static final Color ALPHA_ZERO = new Color(0x0, true); @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); Shape border = getBorderShape(x, y, width - 1, height - 1); g2.setPaint(ALPHA_ZERO); Area corner = new Area(new Rectangle2D.Double(x, y, width, height)); corner.subtract(new Area(border)); g2.fill(corner); g2.setPaint(Color.GRAY); g2.draw(border); g2.dispose(); } public Shape getBorderShape(int x, int y, int w, int h) { int r = h; // h / 2; return new RoundRectangle2D.Double(x, y, w, h, r, r); } @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
- Unleash Your Creativity with Swing and the Java 2D API!
- Border on an rounded JTextField? (Swing / AWT / SWT / JFace forum at JavaRanch)
- java - how i remove unneeded background under roundedborder? - Stack Overflow