java JOptionPane.showMessageDialog 截断 JTextArea 消息
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JOptionPane.showMessageDialog truncates JTextArea message
提问by maerics
My Java GUI application needs to quickly show some text to the end-user, so the JOptionPaneutility methods seem like a good fit. Moreover, the text must be selectable (for copy-and-paste) and it could be somewhat long (~100 words) so it must fit nicely into the window (no text off screen); ideally it should all be displayed at once so the user can read it without needing to interact, so scrollbars are undesirable.
我的 Java GUI 应用程序需要快速向最终用户显示一些文本，因此JOptionPane实用方法似乎很合适。此外，文本必须是可选的（用于复制和粘贴）并且它可能有点长（约 100 个字），因此它必须很好地适应窗口（屏幕外没有文本）；理想情况下，它应该一次全部显示，以便用户无需交互即可阅读，因此滚动条是不可取的。
I thought putting the text into a JTextAreaand using that for the message in JOptionPane.showMessageDialogwould be easy but it appears to truncate the text!
我认为将文本放入 aJTextArea并将其用于消息中JOptionPane.showMessageDialog会很容易，但它似乎截断了文本！
public static void main(String[] args) {
JTextArea textArea = new JTextArea();
textArea.setText(getText()); // A string of ~100 words "Lorem ipsum...\nFin."
textArea.setColumns(50);
textArea.setOpaque(false);
textArea.setEditable(false);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
JOptionPane.showMessageDialog(null, textArea, "Truncated!", JOptionPane.WARNING_MESSAGE);
}
How can I get the text to fit entirely into the option pane without scrollbars and selectable for copy/paste?
如何让文本完全适合选项窗格而没有滚动条并且可选择复制/粘贴？
回答by camickr
import java.awt.*;
import javax.swing.*;
public class TextAreaPreferredHeight2
{
public static void main(String[] args)
{
String text = "one two three four five six seven eight nine ten ";
JTextArea textArea = new JTextArea(text);
textArea.setColumns(30);
textArea.setLineWrap( true );
textArea.setWrapStyleWord( true );
textArea.append(text);
textArea.append(text);
textArea.append(text);
textArea.append(text);
textArea.append(text);
textArea.setSize(textArea.getPreferredSize().width, 1);
JOptionPane.showMessageDialog(
null, textArea, "Not Truncated!", JOptionPane.WARNING_MESSAGE);
}
}
回答by Yuri Joselson
If you need to display a string of an unknown length, you can set number of rows "on the fly":
如果需要显示未知长度的字符串，可以“即时”设置行数：
public static void showMessageDialogFormatted(String msg, String title, int messageType, int columnWidth) {
JTextArea textArea = new JTextArea(msg);
textArea.setColumns(columnWidth);
textArea.setRows(msg.length() / columnWidth + 1);
textArea.setLineWrap(true);
textArea.setEditable(false);
textArea.setWrapStyleWord(true);
JOptionPane.showMessageDialog(null, textArea, title, messageType);
}
回答by Joshua McKinnon
You've got the right idea. Just adjust the rows of your textarea.
你的想法是对的。只需调整 textarea 的行。
textArea.setRows(10); // or value that seems acceptable to you...
This seemed to fix the issue for me, using 100 words of lorem ipsum.
这似乎为我解决了这个问题，使用了 100 个单词的 lorem ipsum。
回答by Huey
Try this:
试试这个：
JTextArea textArea = new JTextArea();
textArea.setText(getText());
textArea.setSize(limit, Short.MAX_VALUE); // limit = width in pixels, e.g. 500
textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);
