如何覆盖单个按钮的Nimbus按钮边距

Question

我创建了一个文本字段组件,里面有一个"x"按钮,用于清除字段的文本.即,我可以使用不会改变按钮上的利润-这当使用Windows的系统的外观和感觉(Windows版),但我有尝试使用雨云时得到正确的看问题的伟大工程button.setMargin(new Inset(0, 0, 0, 0),我可以用系统的外观感觉

在使用Nimbus时,我确实寻求帮助设置边距,这似乎是一个常见的问题.我能够找到允许我更改边距的部分解决方案,但是它会更改所有按钮的边距,我只希望单个按钮与默认值不同.

我明确地设置'x'按钮大小,根据'x'字符串的边界计算,这样它就足以显示'x'.

使用Window的系统外观时的结果,这是我正在寻找的一般外观:

使用默认Nimbus外观时的结果; 'x'溢出了Nimbus允许的空间,导致省略号.

使用Nimbus并覆盖Button.contentMargins的结果:现在'x'按钮看起来正确,但'test'按钮看起来很糟糕.

源代码:

import java.awt.Graphics;
import java.awt.Insets;
import java.awt.geom.Rectangle2D;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.LookAndFeel;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.UnsupportedLookAndFeelException;

public class TextFieldTest {        
    public static void main(String[] args) {
        boolean useNimbusLookAndFeel    = false;
        boolean overrideNimbusDefaults  = false;
        String lafName = UIManager.getSystemLookAndFeelClassName();

        if ( useNimbusLookAndFeel ) {
            for ( LookAndFeelInfo info : UIManager.getInstalledLookAndFeels() ) {
                if ( "Nimbus".equals(info.getName()) ) {
                    lafName = info.getClassName();      
                    break;
                }
            }
        }

        try {
            UIManager.setLookAndFeel(lafName);              
        }
        catch (ClassNotFoundException e) {}
        catch (InstantiationException e) {}
        catch (IllegalAccessException e) {}
        catch (UnsupportedLookAndFeelException e) {}

        //Code to set override default button insets for Nimbus:
        if ( useNimbusLookAndFeel && overrideNimbusDefaults ) {
            LookAndFeel laf = UIManager.getLookAndFeel();               
            if ( laf != null ) {
                UIDefaults def = laf.getDefaults();
                def.put("Button.contentMargins", new Insets(0,0,0,0));
            }
        }       

        //Create frame:
        JPanel panel = new JPanel();        
        panel.add(new JButton("test"));
        panel.add(new DeletableTextField());

        JFrame frame = new JFrame();
        frame.getContentPane().add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }   

    static class DeletableTextField extends JTextField {
        JButton         mButton     = null;

        public DeletableTextField() {
            super(30);
            setup();
        }

        private void setup() {
            mButton = new JButton("x");
            mButton.setMargin(new Insets(0, 0, 0, 0));
            add(mButton);
        }

        @Override
        public void paint(Graphics g) {
            g.setFont(mButton.getFont());
            Rectangle2D rect    = g.getFontMetrics().getStringBounds(mButton.getText(), g);
            int stringWidth     = (int)rect.getWidth();

            int topOffset       = 3;
            int rightOffset     = 3;
            int bottomOffset    = 3;
            int width           = (int)Math.ceil(stringWidth * 2.5);
            int height          = getHeight() - (bottomOffset + topOffset);         
            int x_coord         = getWidth() - (rightOffset + width);

            mButton.setMargin(new Insets(0, 0, 0, 0));
            mButton.setBounds(x_coord, topOffset, width, height);

            super.paint(g);
        }
    }
}

我知道我可以通过其他方式实现这一点,比如在顶部绘制我自己的'x',但我认为利用当前的外观按钮绘制功能来统一外观会更好.

所以我想问一下,在使用Nimbus外观时,如果没有改变所有按钮的边距,是否有任何方法可以改变单个JButton的边距.或者,如果已经存在看起来相似的摆动组件(带有"x"按钮的文本字段),我可以使用它.

Answer 1

Nimbus支持LAF属性的每个实例覆盖,在您的上下文中类似于:

  mButton = new JButton("x");
  UIDefaults def = new UIDefaults();
  def.put("Button.contentMargins", new Insets(0,0,0,0));
  mButton.putClientProperty("Nimbus.Overrides", def);