我如何在JTextPane中为文本和下划线设置不同的颜色？

Question

只是尝试在JTextPane中为文本着色--但问题是文本和下划线不能有不同的颜色。我该怎么做，或者这可能吗？下面的示例打印所有文本并用红色下划线。

JTextPane pane = new JTextPane();

StyleContext context = new StyleContext();

Style style = pane.addStyle("Black", null);
StyleConstants.setAlignment(style, StyleConstants.ALIGN_RIGHT);
StyleConstants.setFontSize(style, 14);
StyleConstants.setSpaceAbove(style, 4);
StyleConstants.setSpaceBelow(style, 4);
StyleConstants.setForeground(style, Color.BLACK);

StyledDocument document = pane.getStyledDocument();


style = pane.addStyle("Red Underline", style);
StyleConstants.setForeground(style, Color.RED);
StyleConstants.setUnderline(style, true);

pane.getDocument().insertString(0,  "Test String", style);

Answer 1

基本上需要创建3个类：

>

您需要扩展javax.swing.text.LabelView来执行修改视图的操作（无论是否添加彩色下划线）。您将重写paint（Graphics,Shape)方法。您可以在重写的类中使用这一行访问属性-属性应该是在文本之外执行其他操作的触发器（比如添加下划线）。

getElement().getAttributes().getAttribute（“属性名称”）；

import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.basic.BasicTextPaneUI;
import javax.swing.text.*;

public class TempProject extends JPanel{


    public static void main(String args[])    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

                //Adding pane
                JTextPane pane = new JTextPane();
                pane.setEditorKit(new CustomEditorKit());
                pane.setText("Underline With Different Color");

                //Set Style
                StyledDocument doc = (StyledDocument)pane.getDocument();
                MutableAttributeSet attrs = new SimpleAttributeSet();
                attrs.addAttribute("Underline-Color", Color.red);
                doc.setCharacterAttributes(0, doc.getLength()-1, attrs, true);

                JScrollPane sp = new JScrollPane(pane);
                frame.setContentPane(sp);  
                frame.setPreferredSize(new Dimension(400, 300));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);


            }
        });
    }

    public static class CustomEditorKit extends StyledEditorKit{

        public ViewFactory getViewFactory(){
            return new CustomUI();
        }
    }

    public static class CustomUI extends BasicTextPaneUI{
        @Override
        public View create(Element elem){
            View result = null;
            String kind = elem.getName();
            if(kind != null){
                if(kind.equals(AbstractDocument.ContentElementName)){
                    result = new MyLabelView(elem);
                } else if(kind.equals(AbstractDocument.ParagraphElementName)){
                    result = new ParagraphView(elem);
                }else if(kind.equals(AbstractDocument.SectionElementName)){
                    result = new BoxView(elem, View.Y_AXIS);
                }else if(kind.equals(StyleConstants.ComponentElementName)){
                    result = new ComponentView(elem);
                }else if(kind.equals(StyleConstants.IconElementName)){
                    result = new IconView(elem);
                } else{
                    result = new LabelView(elem);
                }
            }else{
                result = super.create(elem);
            }

            return result;
        }
    }

    public static class MyLabelView extends LabelView{

        public MyLabelView(Element arg0) {
            super(arg0);
        }

        public void paint(Graphics g, Shape a){
            super.paint(g, a);
            //Do whatever other painting here;
            Color c = (Color)getElement().getAttributes().getAttribute("Underline-Color");
            if(c != null){
                int y = a.getBounds().y + (int)getGlyphPainter().getAscent(this);
                int x1 = a.getBounds().x;
                int x2 = a.getBounds().width + x1;

                g.setColor(c);
                g.drawLine(x1, y, x2, y);
            }

        }

    }

}

这个答案主要是留给后人的，我认为添加一个链接代码的简化版本和解释将有助于使事情更容易理解。