java - 如何为JButton设置自定义渐变？

Question

我想做类似 this 的事情，但仅为我需要的一两个按钮设置自定义渐变，而不是为所有 JButton 实例设置自定义渐变。并动态设置/取消设置它 - 类似于按钮选择/取消选择模式。

Answer 1

所以，这就是答案。

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;

    class JGradientButton extends JButton{
        Color color1 = Color.WHITE;
        Color color2 = Color.PINK;
        JGradientButton(){
            super("Gradient Button");
            setContentAreaFilled(false);
            setFocusPainted(false); // used for demonstration
            addActionListener(new ActionListener() {

                @Override
                public void actionPerformed(ActionEvent evt) {
                    color2 = (color2==Color.PINK) ? Color.GREEN : Color.PINK;
                    //System.out.println(button.isSelected());
                }
            });

        }

        @Override
        protected void paintComponent(Graphics g){
            Graphics2D g2 = (Graphics2D)g.create();
            g2.setPaint(new GradientPaint(
                    new Point(0, 0), 
                    color1, 
                    new Point(0, getHeight()), 
                    color2));
            g2.fillRect(0, 0, getWidth(), getHeight());
            g2.dispose();

            super.paintComponent(g);
        }


    }

还有...

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public final class JGradientButtonDemo {
    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                createAndShowGUI();         
            }
        });
    }

    private static void createAndShowGUI(){
        final JFrame frame = new JFrame("Gradient JButton Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new FlowLayout());
        frame.add(new JGradientButton());
        frame.setSize(new Dimension(300, 150)); // used for demonstration
        //frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }


}