如何覆盖所有JButton的默认鼠标按下背景色，使其当前背景色更暗? [英] How can I override the default mousepressed background color of all JButtons into a darker shade of its current background color?

问题描述

说我有十个JButtons，每个都有明确设置的自己的背景色. 现在，它们都具有默认的鼠标按下背景色，但是如何将它们设置为各自背景色的暗色，而又不一一对应呢?

Say I have ten JButtons each with their own background color explicitly set. Now, they all get the default mousepressed background color but how can I set it to be a shade darker of their respective background colors without doing it one by one?

我知道我可以覆盖UIManager中的颜色:

I know that I can override the color in UIManager :

UIManager.put("Button.select", Color.RED);

我在这里找到的如何在其上更改JButton颜色鼠标按下了吗?

但是这只会将其更改为单一颜色.按下时，我所有的按钮都会变成红色背景.

But that will change it to a single color only. All of my buttons will get a red background when pressed.

有没有办法使其类似于:

Is there a way to make it something like:

UIManager.put("Button.select", JButton.getBackground().darker());

我正在尝试学习Java摇摆，所以请忍着我的无知.

I'm trying to learn java swing so bear with my ignorance.

推荐答案

一种方法是创建自己的ButtonUI.为了避免重新发明轮子的麻烦，您可以扩展ButtonUI的子类.

One way to do this, is to create your own ButtonUI. To avoid the hassle of reinventing the wheel, you can exend a subclass of ButtonUI.

例如BasicButtonUI这样:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.util.Objects;
import java.util.Random;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.plaf.basic.BasicButtonUI;

public class MainWithBasicButtonUI {
    
    public static class SelectButtonUI extends BasicButtonUI {
        protected Color selectColor;
        
        public void setSelectColor(final Color selectColor) {
            this.selectColor = Objects.requireNonNull(selectColor);
        }
        
        public Color getSelectColor() {
            return selectColor;
        }
        
        @Override
        protected void paintButtonPressed(final Graphics g,
                                          final AbstractButton b){
            if (b.isContentAreaFilled()) {
                Dimension size = b.getSize();
                g.setColor(getSelectColor());
                g.fillRect(0, 0, size.width, size.height);
            }
        }
    }
    
    private static void createAndShowGUI() {
        final int rows = 3, cols = 3;
        final Color[] colors = new Color[]{Color.RED.brighter(), Color.GREEN.brighter(), Color.CYAN};
        final JPanel buttons = new JPanel(new GridLayout(rows, cols, 2, 2));
        final Random rand = new Random();
        for (int i = 0; i < rows * cols; ++i) {
            final JButton b = new JButton("Button");
            b.setBackground(colors[rand.nextInt(colors.length)]);
            final SelectButtonUI ui = new SelectButtonUI();
            ui.setSelectColor(b.getBackground().darker());
            b.setUI(ui);
            buttons.add(b);
        }
        final JFrame frame = new JFrame("App");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(buttons);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    
    public static void main(final String[] args) {
        SwingUtilities.invokeLater(MainWithBasicButtonUI::createAndShowGUI);
    }
}

，或者甚至更好的是，MetalButtonUI像这样:

or, even better, MetalButtonUI like so:

import java.awt.Color;
import java.awt.GridLayout;
import java.util.Objects;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.plaf.metal.MetalButtonUI;

public class MainWithMetalButtonUI {
    
    public static class SelectButtonUI extends MetalButtonUI {
        public SelectButtonUI() {
            selectColor = super.getSelectColor();
        }
        
        public void setSelectColor(final Color selectColor) {
            this.selectColor = Objects.requireNonNull(selectColor);
        }
        
        @Override
        protected Color getSelectColor() {
            return selectColor;
        }
    }
    
    private static void createAndShowGUI() {
        final int rows = 3, cols = 3;
        final Color[] colors = new Color[]{Color.RED.brighter(), Color.GREEN.brighter(), Color.CYAN};
        final JPanel buttons = new JPanel(new GridLayout(rows, cols, 2, 2));
        final Random rand = new Random();
        for (int i = 0; i < rows * cols; ++i) {
            final JButton b = new JButton("Button");
            b.setBackground(colors[rand.nextInt(colors.length)]);
            final SelectButtonUI ui = new SelectButtonUI();
            ui.setSelectColor(b.getBackground().darker());
            b.setUI(ui);
            buttons.add(b);
        }
        final JFrame frame = new JFrame("App");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(buttons);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    
    public static void main(final String[] args) {
        SwingUtilities.invokeLater(MainWithMetalButtonUI::createAndShowGUI);
    }
}

唯一的问题是，您所有的按钮总是看起来像金属的L& F.

The only problem with this, is that all your buttons are always going to look like in the metal L&F.

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