Changing Border Color of AWT TextField

问题:

In AWT application I need to set border color of TextField.

In JTextField, I know that we do can do the following

JTextField tf = new JTextField();
tf.setBorder(BorderFactory.createLineBorder(Color.decode("#2C6791")));

But setBorder() method is not availiable in awt TextField. Is there any workaround for this problem?

回答1:

The AWT TextField does not support borders, as you've found. You could emulate a border by putting the text field inside a Panel that's just slightly larger than the textfield and changing the background color of the panel.

回答2:

For compatibility with look & feel variations, the setBorder() API recommends the following: "In general, when you want to set a border on a standard Swing component other than JPanel or JLabel, we recommend that you put the component in a JPanel and set the border on the JPanel."

Addendum: While this suggests an approach, it is irrelevant to a pure AWT application.

回答3:

tf.setBorder(new LineBorder(Color.red,1));
//new LineBorder(color,width);

回答4:

tf.setBorder(new LineBorder(Color.red,1));
//new LineBorder(color,width);

Because the method is overloaded you can define the Color, and leave the rest to the default. Alternatively, you can define the whole method and choose the Color, line Thickness, and type of corners; rounded or not.

    public LineBorder(Color color) {
        this(color, 1, false);
    }
    public LineBorder(Color color, int thickness)  {
        this(color, thickness, false);
    }
    @ConstructorProperties({"lineColor", "thickness", "roundedCorners"})
    public LineBorder(Color color, int thickness, boolean roundedCorners)  {
        lineColor = color;
        this.thickness = thickness;
        this.roundedCorners = roundedCorners;
    }