问题描述

我不理解 JTextPane 中的包装行为.如果我插入一个短文本，然后是一个 JComponent，然后再插入一个短文本，如果框架足够大，我可以在一行中看到插入的内容.但是如果文本更长以至于需要多行，组件总是被放置在一个新的行中.

I don't understand the wrapping behavior in a JTextPane. If I insert a short text, then a JComponent and then again the short text I can see the inserted stuff in one line if the frame is large enough of course. But if the text is much longer so that it takes several lines the component is always placed in a new line.

我已经认识到，在将组件插入 JTextPane 后，它的文本会变长一个字符.因此，如果一个组件被 JTextPane 视为一个字符，为什么它的行为不像一个字符?可能取决于java版本吗?我使用 Java(TM) SE 运行时环境(内部版本 1.7.0-b147)

I have recognized that after a component has been inserted into a JTextPane its text gets longer by one character. So if a component is considered by a JTextPane as a character why doesn't it behave like a character? May it depend on the java version? I use Java(TM) SE Runtime Environment (build 1.7.0-b147)

下面是我的代码(用 shortText/longText 实例化变量 currentText 以重现上述行为):

Below is my code (instantiate the variable currentText with shortText/longText to reproduce the mentioned behavior):

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;

public class Test {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        JTextPane textPane = new JTextPane();
        textPane.setContentType("text/html");

        String shortText = "one two three four five six seven";
        String longText = "A text component that can be marked up with attributes that are represented graphically. You can find how-to information and examples of using text panes in Using Text Components, a section in The Java Tutorial. This component models paragraphs that are composed of runs of character level attributes. Each paragraph may have a logical style attached to it which contains the default attributes to use if not overridden by attributes set on the paragraph or character run. Components and images may be embedded in the flow of text.";
        String currentText = shortText;

        try {
            // insert text before the component
            textPane.getDocument().insertString(textPane.getDocument().getLength(), currentText,
                    new SimpleAttributeSet());

            textPane.setSelectionStart(textPane.getDocument().getLength());
            textPane.setSelectionEnd(textPane.getDocument().getLength());

            JComboBox component = new JComboBox();
            component.setMaximumSize(component.getPreferredSize());
            textPane.insertComponent(component);

            // insert text after the component
            textPane.getDocument().insertString(textPane.getDocument().getLength(), currentText,
                    new SimpleAttributeSet());

        } catch (BadLocationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        textPane.setEditable(false);

        frame.add(new JScrollPane(textPane));
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

推荐答案

由于您设置的内容类型，这种奇怪的行为似乎发生了.尝试删除此行:

That strange behavior seems to happen due to the content type you set. Try removing this line:

textPane.setContentType ( "text/html" );

然后您会发现一切正常.我不确定它为什么会发生 - 可能是一些渲染错误或只是预期的行为.

and you will see that everything works fine after that. I am not sure why it happens - might be either some rendering bug or just an intended behavior.

附:我不认为在文本窗格中使用 Swing 组件(无论原因是什么)是一个不错的选择.但这只是我的看法...

P.S. I don't think that using Swing components inside text pane (whatever the reason is) is a good option. But that is just my opinion...

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