在JTextPane中包装长单词（Java 7） [英] Wrap long words in JTextPane (Java 7)

问题描述

在最多6个Java的所有版本中，放置在JScrollPane中的JTextPane的默认行为是：如果可能，在字边界处换行。如果没有，那么无论如何都要包装它们。

In all versions of Java up to 6, the default behaviour of a JTextPane put inside a JScrollPane was: wrap lines at word boundaries if possible. If not, then wrap them anyway.

在JDK 7中，默认行为似乎是：如果可能的话，在字边界处换行。如果没有，只需扩展JTextPane的宽度（永远不要换长字）。

In JDK 7, the default behaviour seems to be: wrap lines at word boundaries if possible. If not, just expand the width of the JTextPane (never wrap long words).

很容易重现这个，这里是SSCCE：

It is easy to reproduce this, here is a SSCCE:

public class WrappingTest extends JFrame
{

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

    public WrappingTest ()
    {
        setSize(200,200);
        getContentPane().setLayout(new BorderLayout());
        JTextPane jtp = new JTextPane();
        JScrollPane jsp = new JScrollPane(jtp);
        jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        getContentPane().add(jsp,BorderLayout.CENTER);
        setVisible(true);
    }

}

只需在JDK 6中运行它在JDK 7中，写一些小字，然后写一个长字，你就会看到差异。

Just run it in JDK 6 and in JDK 7, write some small words, and write a long word, and you will see the difference.

我的问题很简单... JDK中的新默认行为7完全混淆了我的一个程序（他们应该更加小心Oracle更改这种默认值......它们似乎并不重要但是当你使用JTextPane显示通常包含很长字符串的数据时，它们就是并非如此不重要 - 实际上我要提交一份错误报告，但我想在/如果他们不解决它的情况下有一个解决方法）。有什么方法可以回到以前的行为吗？

My question is simple... the new default behaviour in JDK 7 totally messes a program of mine (they should be more careful at Oracle with changing this kind of defaults... they seem unimportant but when you're using a JTextPane to display data that usually contains very long strings of letters, they're not so unimportant - in fact I'm going to file a bug report, but I'd like to have a workaround while/if they don't resolve it). Any way to go back to the previous behaviour?

请注意，我已经检查了相关问题的答案如何在JTextPane中实现自动换行，以及如何制作它包装一个没有空格的字符串？但它没有回答这个问题 - 它提供了一种使JTextPane完全不考虑空白的方法，但对我来说，如果可能的话，所需的行为就是在空白处分割行，以及其他地方，如果不可能（如以前的Java版本）。

Note that I have checked the answer to the related question How is word-wrapping implemented in JTextPane, and how do I make it wrap a string without spaces? but it doesn't answer this question - it provides a way of making the JTextPane wrap without any regard at all for whitespace, but for me the desired behaviour is split lines at whitespace if possible, and elsewhere if not possible (as in previous Java versions).

推荐答案

对我来说，修复工作（在1.7.0_09下测试） ）

For me the fix works (tested under 1.7.0_09)

import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;

public class WrapTestApp extends JFrame {

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

    public WrapTestApp () {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(200,200);
        getContentPane().setLayout(new BorderLayout());
        JTextPane jtp = new JTextPane();
        jtp.setEditorKit(new WrapEditorKit());
        JScrollPane jsp = new JScrollPane(jtp);
        jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        getContentPane().add(jsp, BorderLayout.CENTER);
        jtp.setText("ExampleOfTheWrapLongWordWithoutSpaces");
        setVisible(true);
    }

    class WrapEditorKit extends StyledEditorKit {
        ViewFactory defaultFactory=new WrapColumnFactory();
        public ViewFactory getViewFactory() {
            return defaultFactory;
        }

    }

    class WrapColumnFactory implements ViewFactory {
        public View create(Element elem) {
            String kind = elem.getName();
            if (kind != null) {
                if (kind.equals(AbstractDocument.ContentElementName)) {
                    return new WrapLabelView(elem);
                } else if (kind.equals(AbstractDocument.ParagraphElementName)) {
                    return new ParagraphView(elem);
                } else if (kind.equals(AbstractDocument.SectionElementName)) {
                    return new BoxView(elem, View.Y_AXIS);
                } else if (kind.equals(StyleConstants.ComponentElementName)) {
                    return new ComponentView(elem);
                } else if (kind.equals(StyleConstants.IconElementName)) {
                    return new IconView(elem);
                }
            }

            // default to text display
            return new LabelView(elem);
        }
    }

    class WrapLabelView extends LabelView {
        public WrapLabelView(Element elem) {
            super(elem);
        }

        public float getMinimumSpan(int axis) {
            switch (axis) {
                case View.X_AXIS:
                    return 0;
                case View.Y_AXIS:
                    return super.getMinimumSpan(axis);
                default:
                    throw new IllegalArgumentException("Invalid axis: " + axis);
            }
        }

    }
}

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