问题描述
因此，我在JPanel(BoxLayout)上具有JTextArea.我也有Box填充器，可以填充JPanel的其余部分.我需要我的JTextArea以单行高度开始(我可以管理它)，并在需要时进行扩展和缩小.
So, I have JTextArea on a JPanel (BoxLayout). I also have Box filler that fills the rest of the JPanel. I need my JTextArea to start of with single-line-height (I can manage that), and to expand and reduce when that is needed.
启用了自动换行，添加/删除新行时，我只需要它来调整它的高度.
Word wrap is enabled, I just need it to adjust it's height when new line is added/removed.
我尝试使用documentListener和getLineCount()，但无法识别自动换行符.
I tried with documentListener and getLineCount(), but it doesn't recognize wordwrap-newlines.
如果可能的话，我希望避免弄乱字体.
I'd like to avoid messing with the fonts if it's possible.
而且，没有乱七八糟的东西.始终显示JTextArea至关重要.
And, NO SCROLL PANES. It's essential that JTextArea is displayed fully at all times.
推荐答案
JTextArea具有相当特殊的副作用，在适当的条件下，它可以自行发展.当我试图设置一个简单的两行文本编辑器(每行限制字符长度，最多两行)时，偶然发现了这个问题.
JTextArea has a rather particular side effect, in the right conditions, it can grow of it's own accord. I stumbled across this by accident when I was trying to set up a simple two line text editor (restricted characters length per line, with a max of two lines)...
基本上，只要有了合适的布局管理器，这个组件就可以独立发展-确实有道理，但让我感到惊讶...
Basically, given the right layout manager, this component can grow of it's own accord - it actually makes sense, but took me by surprise...
此外，如果您对此感兴趣，则可能需要使用ComponentListener来监视组件何时更改尺寸.
Now in addition, you may want to use a ComponentListener to monitor when the component changes size, if that's what you're interested...
public class TestTextArea extends JFrame {
public TestTextArea() {
setLayout(new GridBagLayout());
JTextArea textArea = new JTextArea();
textArea.setColumns(10);
textArea.setRows(1);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
add(textArea);
setSize(200, 200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
textArea.addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent ce) {
System.out.println("I've changed size");
}
});
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new TestTextArea();
}
}
这篇关于JTextArea自动换行大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！