我有一个问题,如何在给定固定宽度的情况下轻松计算JTextPane的首选大小/高度。到目前为止,我已经将我的JTextPane放在JScrollPane中,并且每当我更新文本时,我都会更新JScrollPane的大小。现在,这很好用(尽管我觉得我的代码有些扭曲,但它可以工作),但是当我添加新行时,需要两次调用更新scrollpane高度的代码:一次立即调用,第二次使用
以下是说明所有内容的片段:
invokeLater
。我正在寻找一种避免invokeLater()
的方法。任何方法都可以,包括在组件上分派事件、覆盖Swing方法等...以下是说明所有内容的片段:
import java.awt.AWTEvent;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class Test {
private static MyEventQueue queue;
private static final class MyEventQueue extends EventQueue {
public boolean log = false;
@Override
protected void dispatchEvent(AWTEvent event) {
if (log) {
System.err.println(event.getClass().getName() + " " + event.getSource());
}
super.dispatchEvent(event);
}
}
public static class WrapApp extends JFrame {
JTextPane edit = new JTextPane() {
@Override
public boolean getScrollableTracksViewportWidth() {
return true;
}
};
private JScrollPane comp;
protected void updateVPSize() {
updateSize(true);
}
protected void updateSize(boolean repeat) {
edit.setSize(150, 1000);
Dimension size = edit.getPreferredScrollableViewportSize();
System.err.println("Before " + size);
size.width = 150;
comp.setSize(size);
if (repeat) {
queue.log = true;
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
queue.log = false;
updateSize(false);
}
});
}
}
public WrapApp() {
super("Forced wrap/no wrap example");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().setLayout(null);
edit.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
updateVPSize();
}
@Override
public void insertUpdate(DocumentEvent e) {
updateVPSize();
}
@Override
public void changedUpdate(DocumentEvent e) {
updateVPSize();
}
});
comp = new JScrollPane(edit) {
@Override
public void setSize(int width, int height) {
super.setSize(width, height);
};
};
comp.setBorder(null);
comp.setLocation(0, 0);
comp.setViewportBorder(null);
comp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
edit.setText("Some long text that needs to be wrapped on several lines.\n\nBut this is not the end of it, it can go on and on and on and on...Some long text that needs to be wrapped on several lines.\n\nBut this is not the end of it, it can go on and on and on and on...");
getContentPane().add(comp);
setSize(300, 700);
setLocationRelativeTo(null);
updateVPSize();
}
}
public static void main(String[] args) {
Toolkit.getDefaultToolkit().getSystemEventQueue().push(queue = new MyEventQueue());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
WrapApp m = new WrapApp();
m.setVisible(true);
}
});
}
}
不要太在意里面剩下的东西,我尝试了很多东西。