是否可以通過X和Y坐標指定JTextPane的插入位置？

Question

JtextPane setCaretPosition()將int作為參數，但是我需要根據x和y像素坐標指定插入符號的位置。 有什么方法可以實現這一目標？

編輯：我已經用一些原始代碼替換了以前的SSCCE，以顯示數據是如何輸入的，因為在對文檔字符串進行硬編碼時沒有問題。 代碼段：

import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.StyledDocument;


public class Mock extends JDialog{

    JFrame f = new JFrame("My mock ");
    JTextPane contentPlaceHolder = new JTextPane();
    StyledDocument doc = new DefaultStyledDocument();
    String content = "This is line 1\n"+ 
                     "This is line 2\n" + 
                     "This is line 3\n"+ 
                     "This is line 4\n" + 
                     "This is line 5\n";

    int x, y;
    OutputStream out;
    InputStream in;

    KeyAdapter kl = new KeyAdapter()
    {

        public void keyTyped(KeyEvent e){
            int c = e.getKeyChar();

            try
            {
                    out.write(c);
            }
            catch (Exception ex)
            {
                System.out.println("Exception occured in key Typed event:\n" + ex.getMessage());
            }
            e.consume();
        }

    };

     private void initGUI() throws BadLocationException{

         new RemoteConsumer().start();
         contentPlaceHolder.addKeyListener(kl);
         doc.insertString(0, content, null);
         contentPlaceHolder.setDocument(doc);
         f.getContentPane().add(contentPlaceHolder, BorderLayout.CENTER);
         contentPlaceHolder.setVisible(true);
         pack();
         f.setSize(400, 300);
         f.setVisible(true);
         System.out.println("Should be visible");
         new RemoteConsumer().start();
     } 

     void startGUI()
        {
            Runnable r = new Runnable()
            {
                public void run()
                {
                    try {
                        initGUI();
                    } catch (BadLocationException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }

            };

            SwingUtilities.invokeLater(r);

        }    

        class RemoteConsumer extends Thread
        {
            char[][] lines = new char[y][];
            int posy = 0;
            int posx = 0;

            private void addText(byte[] data, int len) throws BadLocationException 
            {
                for (int i = 0; i < len; i++)
                {
                    char c = (char) (data[i] & 0xff);

                    /**
                     * based on the character, there will be   positioning of cursor based on posx, posy. 
                       I want to use this posx and posy as the coordinates for caret position
                     * after that, buffer is appended with newly arrived character
                     */

                    if (lines[posy] == null)
                    {
                        lines[posy] = new char[x];
                        for (int k = 0; k < x; k++)
                            lines[posy][k] = ' ';
                    }

                    lines[posy][posx] = c;
                    posx++;
                }
                StringBuffer sb = new StringBuffer(x * y);


                for (int i = 0; i < lines.length; i++)
                {
                    if (i != 0)
                        sb.append('\n');

                    if (lines[i] != null)
                    {
                        sb.append(lines[i]);
                    }
                }                           
                doc.insertString(doc.getLength(), sb.toString(), null);
                contentPlaceHolder.setDocument(doc);            
            }

            /**
             * This is the entry point from which the data comes in
             * Now, it will give error, as no data has been sent by server
             */
            public void run()
            {
                byte[] buff = new byte[8192];

                try
                {
                    while (true)
                    {
                        int len = in.read(buff);
                        if (len == -1)
                            return;
                        addText(buff, len);
                    }
                }
                catch (Exception e)
                {
                    System.out.println("Error in reading value : " + e.getMessage());
                    return;
                }
            }
        }


        public static void main(String[] args) throws BadLocationException
        {

            Mock mk = new Mock();
            mk.startGUI();
        }
}

請注意，對doc的值進行硬編碼不會出現問題。 僅當在窗格上顯示鍵入的字符時，才會出現此問題[命令是out.write(character) ，其中out是OutputStream類型的]。

Answer 1

JTextComponent有一個viewToModel方法，該方法接受一個Point並返回Document的int位置。 請參閱： https : //docs.oracle.com/javase/7/docs/api/javax/swing/text/JTextComponent.html#viewToModel(java.awt.Point）

對於JTextPane可以，因為它擴展了JEditorPane，后者擴展了JTextComponent。