Java Swing TextArea:如何在输出TextArea中同时打印音译文本? [英] Java Swing TextArea: How to simultaneously print Transliterated text/s in an Output TextArea?

问题描述

我正在尝试编写文本编辑器.我想要两个TextAreas:第一个，用于在unicode脚本中键入/编辑，以及第二个，用于同时打印由我自己设置的相应罗马脚本(ASCII)输入的unicode脚本的输出.在音译方案的基础上. 调用音译方法时，我无法更新并同时在输出文本区域中打印输入文本.将输出textArea设置为同时打印时，我可以感觉到有些问题，但是我无法确定到底是什么.

I am trying to write a text editor. I want two TextAreas: 1st one for typing/editing in unicode script and 2nd one for simultaneously printing output of the unicode script input in corresponding Roman Script (ASCII) set by myself on the basis of a transliteration scheme. I am not able to update and simultaneously print the input text in output textarea while I call the transliteration method. I can sense a little bit that there is something wrong while I set the output textArea to print simultaneously but I am unable to find out what exactly is that.

编辑器类------->

The Editor class------->

import java.awt.*;
import java.beans.PropertyChangeSupport;
import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;

public class editor extends JPanel {
    private static final int ROWS = 10;
    private static final int COLS = 50;
    private static final String[] BUTTON_NAMES = {"विविधाः", "द्वाराणि", "Setting", "Parse", "Compile"};
    private static final int GAP = 3;
    private JTextArea inputTextArea = new JTextArea(ROWS, COLS);
    private JTextArea outputTextArea = new JTextArea(ROWS, COLS);
    private JTextArea TA = new JTextArea(ROWS, COLS);

//calling the transliteration method
    transliterator tr = new transliterator();
    Document asciiDocument=tr.DevanagariTransliteration(inputTextArea.getDocument());

    public editor() throws BadLocationException {
        JPanel buttonPanel = new JPanel(new GridLayout(1, 0, GAP, 0));
        for (String btnName : BUTTON_NAMES) {
            buttonPanel.add(new JButton(btnName));
        }

        setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
        setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
        add(buttonPanel);

        add(putInTitledScrollPane(inputTextArea, "देवनागरी <<<<<<>>>>>> Devanagari"));

        inputTextArea.setFocusable(true);
        outputTextArea.setFocusable(false);
        outputTextArea.setEditable(false);

        //String inputCheck = inputTextArea.getText();
        //inputTextArea.setText("x");
        //if (inputTextArea.getText().length()>0) {


       outputTextArea.setDocument(asciiDocument);//printing input in 2nd textarea
        // outputTextArea.setDocument(inputTextArea.getDocument());//printing input in 2nd textarea


        add(putInTitledScrollPane(outputTextArea, "IndicASCII"));

    }

    private JPanel putInTitledScrollPane(JComponent component,
                                         String title) {
        JPanel wrapperPanel = new JPanel(new BorderLayout());
        wrapperPanel.setBorder(BorderFactory.createTitledBorder(title));
        wrapperPanel.add(new JScrollPane(component));
        return wrapperPanel;
    }

    private static void createAndShowGui() throws BadLocationException {
        editor mainPanel = new editor();

        JFrame frame = new JFrame("Unicode Editor");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.getContentPane().add(mainPanel);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
        ImageIcon imgicon = new ImageIcon("MyIcon.jpg");
        frame.setIconImage(imgicon.getImage());
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    createAndShowGui();
                } catch (BadLocationException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

音译类方法:

import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;

public class transliterator {
    //method that returns a Document type
    // the method - importing devanagari text through the type 'Document' from input textArea by call
    public Document DevanagariTransliteration(Document devanagariTextDocument) throws BadLocationException {
        //extracting the devanagari text from the imported Document type
        String asciiText = devanagariTextDocument.getText(0, devanagariTextDocument.getLength());
        //devanagari unicode a replaced by ascii a
        String transliteratedText = asciiText.replace('\u0905', 'a');

        JTextArea jt = new JTextArea();
        //inserting the TRANSLITERATED text to a textArea to extract as a Document again
        jt.setText(transliteratedText);
        //extracting and creating as a document
        Document ASCIITextDocument = jt.getDocument();
        //returning the document
        return ASCIITextDocument;
    }
}

推荐答案

要将一个文档中的更改反映到另一文档中，可以使用 mre ，它演示了在处理输入" JTextArea中的更改之后更新输出" JTextArea.
用于演示目的的处理是将输入简单地转换为大写形式.应该将其更改为您的特定需求:

To reflect changes in one document onto another document you can use a DocumentListener as suggested by camickr.
The following is an mre that demonstrates updating the "output" JTextArea after processing the changes in the "input" JTextArea.
The processing used for demonstration purposes is a simply converting the input to upper case. This should be changed to your specific needs :

import java.awt.BorderLayout;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;

public class MyWindow extends JPanel {

    private static final int ROWS = 10, COLS = 50;

    private final JTextArea outputTextArea;

    public MyWindow() {
        setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));

        JTextArea inputTextArea = new JTextArea(ROWS, COLS);
        inputTextArea.getDocument().addDocumentListener(new TransliterateDocumentListener());
        add(putInTitledScrollPane(inputTextArea,"Input"));

        outputTextArea = new JTextArea(ROWS, COLS);
        outputTextArea.setFocusable(false);
        outputTextArea.setEditable(false);

        add(putInTitledScrollPane(outputTextArea, "Output"));
    }


    private JPanel putInTitledScrollPane(JComponent component, String title) {
        JPanel wrapperPanel = new JPanel(new BorderLayout());
        wrapperPanel.setBorder(BorderFactory.createTitledBorder(title));
        wrapperPanel.add(new JScrollPane(component));
        return wrapperPanel;
    }

    private static void createAndShowGui() {
        JFrame frame = new JFrame("Document Listener Demo");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.getContentPane().add( new MyWindow());
        frame.pack();
        frame.setVisible(true);
    }


    private void insert(String text, int from) {
        text = process(text);
         try {
            outputTextArea.getDocument().insertString(from, text, null);
        } catch (BadLocationException ex) {
            ex.printStackTrace();
        }
    }

    private void remove(int from, int length) {
         try {
            outputTextArea.getDocument().remove(from, length);
        } catch (BadLocationException ex) {
            ex.printStackTrace();
        }
    }

    private String process(String text) {
        //todo process text as needed
        //returns upper case text for demo
        return text.toUpperCase();
    }

    class TransliterateDocumentListener implements DocumentListener {

        @Override
        public void insertUpdate(DocumentEvent e) {
            Document doc = e.getDocument();
            int from = e.getOffset(), length = e.getLength();
            try {
                insert(doc.getText(from, length), from);
            } catch (BadLocationException ex) {
                ex.printStackTrace();
            }
        }

        @Override
        public void removeUpdate(DocumentEvent e) {
            remove(e.getOffset(), e.getLength());
        }

        @Override
        public void changedUpdate(DocumentEvent e) {
             //Plain text components don't fire these events.
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }
}

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