Jtextfield 的 Java Swing 圆形边框

Question

当我这样做时:

LineBorder lineBorder =new LineBorder(Color.white, 8, true);
jTextField2.setBorder(lineBorder );

我得到这样的结果:

如何在不显示方角和文本半切的情况下设置圆角边框？

非常感谢。

最好的问候

Answer 1

您可以覆盖 JTextFiled 构建您自己的圆角 JTextField。您必须覆盖它的 paintComponent()、paintBorder() 和 contains() 方法。您需要绘制 roundRect 作为文本字段的形状。

例子:

public class RoundJTextField extends JTextField {
    private Shape shape;
    public RoundJTextField(int size) {
        super(size);
        setOpaque(false); // As suggested by @AVD in comment.
    }
    protected void paintComponent(Graphics g) {
         g.setColor(getBackground());
         g.fillRoundRect(0, 0, getWidth()-1, getHeight()-1, 15, 15);
         super.paintComponent(g);
    }
    protected void paintBorder(Graphics g) {
         g.setColor(getForeground());
         g.drawRoundRect(0, 0, getWidth()-1, getHeight()-1, 15, 15);
    }
    public boolean contains(int x, int y) {
         if (shape == null || !shape.getBounds().equals(getBounds())) {
             shape = new RoundRectangle2D.Float(0, 0, getWidth()-1, getHeight()-1, 15, 15);
         }
         return shape.contains(x, y);
    }
}

要查看效果:

    JFrame frame = new JFrame("Rounded corner text filed demo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 400);
    frame.setLayout(new FlowLayout());
    JTextField field = new RoundJTextField(15);
    frame.add(field);
    frame.setVisible(true);