Swing JTextArea:自动LineWrap后正确调整对话框大小 [英] Swing JTextArea: Resize Dialog properly after automatic LineWrap

问题描述

我希望我不会错过一些重复的问题，我觉得这应该是微不足道的！

I hope I did not miss some duplicate question, I feel like this should be trivial!

无论如何，我有一个JTextArea带有文本，并且带有自动换行符:

Anyway, I have a JTextArea with text in it, with automatic line wraps:

public PleaseResize(){
    super();
    Container cp = this.getContentPane();

    JTextArea area = new JTextArea();
    area.setColumns(20);
    area.setLineWrap(true);
    area.setEditable(false);
    area.setWrapStyleWord(true);
    area.setText("Once upon a midnight dreary, while I pondered, weak and weary, over many a quaint an curious volume of forgotten lore.");
    cp.add(area, BorderLayout.CENTER);

    cp.add(new JButton("Hallo"), BorderLayout.SOUTH);
    this.pack();
}

我希望文本区域垂直调整大小以显示整个文本...但是没有.如果我通过按\n来选择换行符，它的大小会很合适，但是使用自动换行时，它会保持原来的大小.

I want the text area to resize vertically to display the whole text... but it does not. It resizes happily if I choose the line breaks via pushing in \n, but with automatic wrapping, it just remains the size it is.

我不知何故觉得自己完全缺少了一些东西...

I somehow feel like I am missing something totally obvious...

进行说明:

在创建时，我不知道文本将有多少行(由于发生自动换行符).我正在通过XML文件接收文本，并且换行后，它的范围在0到30行之间.我有垂直的空间可以显示所有内容，但是当没有或只有很少的文本要显示时，我不想滚动或拥有巨大的白色区域.

On creation-time, I do not know how many lines the text will have (due to the automatic linebreaks happening). I am receiving Text via an XML-file, and it can vary between 0 and about 30 lines after wrapping. I have the vertical space to display everything, but I do not want to scroll or to have a huge, white area when there is no or only a little text to display.

重述问题后，他们解决我所面临问题的关键显然不是调整JTextArea的大小，而是确保对话框知道它的大小！

After rephrasing the question, they key to the problem I was facing was apparently not resizing the JTextArea, but making sure the dialog knows how big it is!

因此，这是我最终使用的解决方案的链接:

So, here is the link back to the solution I ended up using: An automatic resizing Text above a button?

推荐答案

您需要像下一个new JScrollPane(area);一样用JScrollPane包装JTeatArea，然后将JScrollPane添加到您的JFrame.

You need to wrap JTeatArea with JScrollPane like next new JScrollPane(area); and then add JScrollPane to your JFrame.

还用空构造函数创建JTextArea，使用

Also you create JTextArea with empty constructor, use JTextArea(int rows, int cols) to specify count of rows and columns.

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