如何在Swing

Question

如何在Swing中使用内部阴影创建这样的JButton？

我想用不同的JButton边框创建Color，例如上边框和左边框颜色应为黑色，右下边框颜色应为白色。

但总的来说，我想要像上面的图像一样，在顶部和左侧都有深灰色的内部阴影。

Answer 1

首先我认为你可以通过一个简单的BevelBorder来实现这个目标，但不幸的是你不能轻松地设置边框的厚度......所以我必须基本上做一个自定义的Border。如果您不喜欢paintBorder方法中的按钮样式，则可以对其进行更多自定义，但您必须知道如何使用Graphics。这就是我所拥有的：

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.Border;

/**
 *
 */
public class MyBorder implements Border {

    private int thickness_ = 4;
    private Color white = Color.WHITE;
    private Color gray = Color.GRAY;
    private Color black = Color.BLACK;

    public static void main(String[] args) {

        JFrame frm = new JFrame("Border Test");
        frm.setLayout(new FlowLayout());
        JButton btn = new JButton("Button");

        MyBorder border = new MyBorder();

        btn.setBorder(border);
        btn.setFocusPainted(false);
        btn.setPreferredSize(new Dimension(60,30));
        btn.setBackground(Color.LIGHT_GRAY);

        frm.add(btn);
        frm.setSize(200,200);
        frm.setVisible(true);

    }

    public void paintBorder(Component c, Graphics g, int x, int y, int width,
            int height) {
        Color oldColor = g.getColor();
        int i;

        for (i = 0; i < thickness_; i++) {
            g.setColor(white);
            g.drawRect(x + i, y + i, width - i - i - 1, height - i - i - 1); //White Rectangle
        }
        for (i = 0; i < thickness_/2; i++) {
            g.setColor(black);
            g.drawLine(x + i, y + i, (width - x) - (i * 2), y + i); //Top Outer Edge
            g.drawLine(x + i, y + i, x + i, (height - y) - (i * 2));  //Left Outer Edge
        }
        for (i = thickness_/2; i < thickness_; i++) {
            g.setColor(gray);
            g.drawLine(x + i, y + i, (width - x) - (i * 2), y + i); //Top Inner Edge
            g.drawLine(x + i, y + i, x + i, (height - y) - (i * 2)); //Left Inner Edge

        }
        g.setColor(oldColor);
    }

    public int getThickness() {
        return thickness_;
    }

    public void setThickness(int i) {
        thickness_ = i;
    }

    public boolean isBorderOpaque() {
        return true;
    }

    public Insets getBorderInsets(Component c) {
        return new Insets(thickness_, thickness_, thickness_, thickness_);
    }

}