更改 Nimbus LaF 中 JButton 的默认键值

Question

I have a two Buttons in my program

JButton button1 = new JButton();
button1.setText("First Button");
JButton button2 = new JButton("Second Button");

I have tried to change the LaF of the button, I am able to change the button background color using the following code

UIManager.put(Button.background new color(134,201,236));

But when i tried to change the other key values like "Button.disabled" , "Button[Default+Focused+Pressed].backgroundPainter" the code did not work for me. Could someone help me how to change the default key values which uses Painter?

Answer 1

Gotta love Nimbus.

Okay to start with, you're going to want to keep these values close...

Button.background = DerivedColor(color=214,217,223 parent=control offsets=0.0,0.0,0.0,0 pColor=214,217,223
Button.contentMargins = javax.swing.plaf.InsetsUIResource[top=6,left=14,bottom=6,right=14]
Button.defaultButtonFollowsFocus = false
Button.disabled = DerivedColor(color=214,217,223 parent=control offsets=0.0,0.0,0.0,0 pColor=214,217,223
Button.disabledText = DerivedColor(color=142,143,145 parent=nimbusDisabledText offsets=0.0,0.0,0.0,0 pColor=142,143,145
Button.focusInputMap = javax.swing.plaf.InputMapUIResource@70e4bd3a
Button.font = javax.swing.plaf.FontUIResource[family=SansSerif,name=sansserif,style=plain,size=12]
Button.foreground = DerivedColor(color=0,0,0 parent=text offsets=0.0,0.0,0.0,0 pColor=0,0,0
ButtonUI = javax.swing.plaf.synth.SynthLookAndFeel
Button[Default+Focused+MouseOver].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@3e5d2085
Button[Default+Focused+Pressed].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@78662669
Button[Default+Focused].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@2988e80b
Button[Default+MouseOver].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@7c508d6d
Button[Default+Pressed].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@2b5ec36a
Button[Default+Pressed].textForeground = DerivedColor(color=255,255,255 parent=nimbusSelectedText offsets=0.0,0.0,0.0,0 pColor=255,255,255
Button[Default].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@62c2ed06
Button[Disabled].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@c6499e5
Button[Disabled].textForeground = DerivedColor(color=142,143,145 parent=nimbusDisabledText offsets=0.0,0.0,0.0,0 pColor=142,143,145
Button[Enabled].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@742746e1
Button[Focused+MouseOver].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@293f9e9c
Button[Focused+Pressed].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@5ce0ec60
Button[Focused].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@7463fda8
Button[MouseOver].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@3a3dad8b
Button[Pressed].backgroundPainter = javax.swing.plaf.nimbus.ButtonPainter@6f231f2e

These are basically the default key/values used by Nimbus to paint a standard button...

Basically, what you have to do is provide your own Painter , for example...

public class ButtonPainter implements Painter {

    private Color light, dark;
    private GradientPaint gradPaint;

    public ButtonPainter(Color light, Color dark) {
        this.light = light;
        this.dark = dark;
    }

    @Override
    public void paint(Graphics2D g, Object c, int w, int h) {
        System.out.println("...");
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        gradPaint = new GradientPaint((w / 2.0f), 0, light, (w / 2.0f), (h / 2.0f), dark, true);
        g.setPaint(gradPaint);
        g.fillRect(2, 2, (w - 5), (h - 5));

        Color outline = new Color(0, 85, 0);
        g.setColor(outline);
        g.drawRect(2, 2, (w - 5), (h - 5));
        Color trans = new Color(outline.getRed(), outline.getGreen(), outline.getBlue(), 100);
        g.setColor(trans);
        g.drawRect(1, 1, (w - 3), (h - 3));
    }
}

And then replace the UIManager values

UIManager.getLookAndFeelDefaults().put("Button[Enabled].backgroundPainter", new ButtonPainter(Color.YELLOW, Color.RED));
UIManager.getLookAndFeelDefaults().put("Button[Focused].backgroundPainter", new ButtonPainter(Color.YELLOW, Color.RED));

For example...

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.RenderingHints;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.Painter;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.ColorUIResource;

public class TestNimbus {

    public static void main(String[] args) {
        new TestNimbus();
    }

    public TestNimbus() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                System.out.println(UIManager.get("Button[Default+Focused].backgroundPainter"));

                UIManager.getLookAndFeelDefaults().put("Button[Enabled].backgroundPainter", new ButtonPainter(Color.YELLOW, Color.RED));
                UIManager.getLookAndFeelDefaults().put("Button[Focused].backgroundPainter", new ButtonPainter(Color.YELLOW, Color.RED));

                System.out.println(UIManager.get("Button[Default+Focused].backgroundPainter"));


                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new GridBagLayout());
                frame.add(new JButton("First Button"));
                frame.add(new JButton("Second Button"));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class ButtonPainter implements Painter {

        private Color light, dark;
        private GradientPaint gradPaint;

        public ButtonPainter(Color light, Color dark) {
            this.light = light;
            this.dark = dark;
        }

        @Override
        public void paint(Graphics2D g, Object c, int w, int h) {
            System.out.println("...");
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            gradPaint = new GradientPaint((w / 2.0f), 0, light, (w / 2.0f), (h / 2.0f), dark, true);
            g.setPaint(gradPaint);
            g.fillRect(2, 2, (w - 5), (h - 5));

            Color outline = new Color(0, 85, 0);
            g.setColor(outline);
            g.drawRect(2, 2, (w - 5), (h - 5));
            Color trans = new Color(outline.getRed(), outline.getGreen(), outline.getBlue(), 100);
            g.setColor(trans);
            g.drawRect(1, 1, (w - 3), (h - 3));
        }
    }

}

This is a global change, so all buttons will be affected by this change. I believe there's a way to do so only those controls you want to change can be affected, but you will need to do some more research into that yourself ;)

Answer 2

Here's a hack that works:

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.plaf.synth.SynthButtonUI;
import javax.swing.plaf.synth.SynthGraphicsUtils;

public class FlatButton extends JButton {

    private static final SynthButtonUI UI = new SynthButtonUI();
    private static final SynthGraphicsUtils UTIL = new SynthGraphicsUtils();

    public FlatButton() {
    }

    public FlatButton(Icon icon) {
        super(icon);
    }

    public FlatButton(String text) {
        super(text);
    }

    public FlatButton(Action a) {
        super(a);
    }

    public FlatButton(String text, Icon icon) {
        super(text, icon);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D)g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setPaint(this.getBackground());
        final Dimension d = this.getPreferredSize();
        g2d.fillRect(0,0, d.width, d.height);
        this.paintBorder(g);

        g2d.setColor(this.getForeground());
        g2d.setFont(this.getFont());
        UTIL.paintText(
          UI.getContext(this), g, this.getText(), this.getIcon(),
          this.getHorizontalAlignment(), this.getVerticalAlignment(),
          this.getHorizontalTextPosition(), this.getVerticalTextPosition(),
          this.getIconTextGap(), this.getDisplayedMnemonicIndex(), 0);

    }
}