为什么jtextpane的getHeight()方法返回的高度一直不变.?

Question

content is an component, so content.getHeight() returned the height of this component. It is not the height of the text contents.

Answer 1

It's not easy to calculate the height. You may use styleconstants to calculate.
Here is a alternative solution.content.setCaretPosition(content.getText().getLength());

Answer 2

有没有一个jtextpane配合滚动条滚动的例子啊？content.setCaretPosition(content.getText().getLength());
好像也不行。是不是滚动条被限制了啊？

Answer 3

sorry, should becontent.setCaretPosition(content.getText().length());
I tested, it's ok

Answer 4

http://577.86.cn/_temp/Applet1.html不行，你到上面页面看看
点一下button4看看，下面是button4中的方法。  void button4_actionPerformed(ActionEvent e) {
    label1.setText(content.getText().length()+"");
    content.setCaretPosition(content.getText().length()-1);  }下面是我的源代码
http://577.86.cn/_temp/Applet1.java

Answer 5

/** 
 * @Author [email protected]
 */import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class Demo extends JFrame{
JTextPane textPane=new JTextPane();
public Demo(){
super("JTextPane Demo");
getContentPane().setLayout(new BorderLayout());

final JButton buttonHome=new JButton("Go to Home");
final JButton buttonEnd=new JButton("Go to End");
ActionListener positionHandler=new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource()==buttonHome){
textPane.setCaretPosition(0);
textPane.requestFocus();
} else if(e.getSource()==buttonEnd){
textPane.selectAll();
textPane.setCaretPosition(textPane.getSelectedText().length());
textPane.requestFocus();
}
} };
buttonHome.addActionListener(positionHandler);
buttonEnd.addActionListener(positionHandler);

JPanel paneNorth=new JPanel();
JPanel paneSouth=new JPanel(); paneSouth.add(buttonHome);
paneSouth.add(buttonEnd);

getContentPane().add(paneSouth,BorderLayout.SOUTH); paneNorth.setLayout(new BorderLayout());
paneNorth.add(new JScrollPane(textPane),BorderLayout.CENTER);
getContentPane().add(paneNorth,BorderLayout.CENTER); setSize(300,400);
show(); }
public static void main(String[] args){
Demo app=new Demo();
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

Answer 6

also solve your
我只是想看到jtextpane中超出窗口可以看到的那部分。就这么难吗？滚不下去

Answer 7

用setSelectionStart(jtextpanetextleng)方法设置到最后一行