JTextPane 格式

问题描述

我有一个 JTextPane，我想在其中添加行，并根据它们的内容让它们具有不同的格式.

I have a JTextPane where I want to add lines and depending on their content have them have a different formatting.

目前我有这个

StyleContext context = new StyleContext();
StyledDocument document = new DefaultStyledDocument(context);

Style styleBold = context.getStyle(StyleContext.DEFAULT_STYLE);
StyleConstants.setBold(styleBold, true);
StyleConstants.setFontSize(styleBold, 18);

Style styleNorm = context.getStyle(StyleContext.DEFAULT_STYLE);
StyleConstants.setFontSize(styleNorm, 15);

for (int i = 0; i < temp.size(); i++) {
    String tmp = temp.get(i);
    if (tmp.substring(0, 2).equals(COMMENT_PREFIX)) {
        String addThis = " - " + tmp.substring(2);

        try {
            document.insertString(document.getLength(), addThis,
                    styleNorm);
        } //CATCH
    } else if (tmp.substring(0, 2).equals(VERSION_PREFIX)) {
        Date d = new Date(System.currentTimeMillis());
        String addThis = "Version: " + tmp.substring(2) + " - "
                + d.toString();
        try {
            document.insertString(document.getLength(), addThis,
                    styleBold);
        } //CATCH
    }
    try {
        document.insertString(document.getLength(), "
", styleNorm);
    } //CATCH
}

我去掉了 catch 语句以减少代码大小.

I took out the catch statements to reduce code size.

然而，这会使用 styleNorm 格式化我的整个文本.这是因为它是最后一个调用 Style 并且它们相互覆盖吗?如果是这样，我该如何解决这个问题?

However, this formats my entire text with the styleNorm. Is this because it's the last called Style and they overwrite eachother? If so, how do I fix this?

推荐答案

也见这里, TextComponentDemo 展示了如何应用多个StyleConstants，包括字体大小、样式、对齐方式和颜色.样式可以直接应用于 Document，如 initAttributes() 所示，或通过 StyledEditorKit 的操作，见 这里.

Also seen here, TextComponentDemo shows how to apply a number of StyleConstants, including font size, style, alignment and color. The styles may applied either directly to the Document, as shown in initAttributes(), or via the actions of StyledEditorKit, seen here.

附录:下面的示例使用 SimpleAttributeSet 创建了三个相关的样式.请注意，highAlert 改变了颜色，但保留了从 boldBlue 继承的 bold 属性.

Addendum: The example below creates three related styles using SimpleAttributeSet. Note that highAlert alters the color but retains the bold attribute inherited from boldBlue.

import java.awt.Color;
import java.awt.EventQueue;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

/**
 * @see https://stackoverflow.com/a/15600689/230513
 */
public class Test {

    private void display() throws BadLocationException {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        String s = new Date().toString();
        JTextPane jtp = new JTextPane();
        StyledDocument doc = (StyledDocument) jtp.getDocument();

        SimpleAttributeSet normal = new SimpleAttributeSet();
        StyleConstants.setFontFamily(normal, "SansSerif");
        StyleConstants.setFontSize(normal, 16);

        SimpleAttributeSet boldBlue = new SimpleAttributeSet(normal);
        StyleConstants.setBold(boldBlue, true);
        StyleConstants.setForeground(boldBlue, Color.blue);

        SimpleAttributeSet highAlert = new SimpleAttributeSet(boldBlue);
        StyleConstants.setFontSize(highAlert, 18);
        StyleConstants.setItalic(highAlert, true);
        StyleConstants.setForeground(highAlert, Color.red);

        doc.insertString(doc.getLength(), s + "
", normal);
        doc.insertString(doc.getLength(), s + "
", boldBlue);
        doc.insertString(doc.getLength(), s + "
", highAlert);
        f.add(jtp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    new Test().display();
                } catch (BadLocationException ex) {
                    ex.printStackTrace(System.err);
                }
            }
        });
    }
}

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