我是Java新手,刚刚在StackOverflow中找到了这段代码:ResizeTextArea https://stackoverflow.com/questions/9370561/enabling-scroll-bars-when-jtextarea-exceeds-certain-amount-of-lines/9383400#9383400.
我想用JTextPane
代替JTextArea
. In JTextPane
,没有setRows()
方法改变行数。任何帮助,将不胜感激。
a 中各行的高度StyledDocument
可能会有所不同,因此限制的概念rows in a JTextPane
没有用。你can将滚动窗格视口的首选大小限制为主面板大小的一些有用部分,如图所示here https://stackoverflow.com/a/14858272/230513及以下。
Addendum: As @camickr comments, it's a little easier to override getPreferredSize()
in JScrollPane
. I've also updated the code to limit growth to a fraction of the current size: 1/3.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.border.EmptyBorder;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
/**
* @see https://stackoverflow.com/a/15042241/230513
* @see https://stackoverflow.com/a/14858272/230513
*/
public class LimitTextPaneSize {
private static final int SIZE = 200;
private static final double LIMIT = 1 / 3d;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
display();
}
});
}
private static void display() {
final JPanel mainPanel = new JPanel(new BorderLayout(5, 5));
mainPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
JPanel topPanel = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(SIZE, SIZE);
}
};
final JTextPane chatArea = new JTextPane();
final JScrollPane scrollPane = new JScrollPane(chatArea){
@Override
public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
int desired = (int) (mainPanel.getSize().height * LIMIT);
int limit = Math.min(desired, d.height);
return new Dimension(SIZE, limit);
}
};
chatArea.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e) {
updateSize();
}
@Override
public void removeUpdate(DocumentEvent e) {
updateSize();
}
@Override
public void changedUpdate(DocumentEvent e) {
updateSize();
}
private void updateSize() {
mainPanel.revalidate();
}
});
mainPanel.add(topPanel, BorderLayout.CENTER);
mainPanel.add(scrollPane, BorderLayout.SOUTH);
JFrame f = new JFrame("LimitTextPaneSize");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(mainPanel);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)