Pierre :
I am looking for your help to solve my problem on which I am currently working at. The requirement is, Is there a way to insert word by word(text) in JTextarea from existing text stored(like a dictionary) while typing in JTextarea? it should be with KeyTyped or some other technique ...
Thanks in advance for your help.
DevilsHnd :
Based on the runnable code provided by @GuillaumePolet located in this SO Post.
I've taken this code and modified it a wee bit so that it can pull in 10 specific words from a word list file and display them within a popup list near the editing caret's current location. You can finish typing or use your mouse to double-click the word you want from the displayed popup list or you can use your cursor and Enter keys to do the same thing.
The word list you use is up to you. I simply copied one from the internet which consists of 124390 words. Just supply the dictionaryFilePath String member variable the path and file name of the dictionary text file you want to use. This variable is located within the SuggestionPanel inner class. Here is the whole runnable code:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTextArea;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
public class WordAssist {
public class SuggestionPanel {
private JList list;
private JPopupMenu popupMenu;
private String subWord;
private final int insertionPosition;
private final String dictionaryFilePath = "Dictionary.txt";
public SuggestionPanel(JTextArea textarea, int position, String subWord, Point location) {
this.insertionPosition = position;
this.subWord = subWord;
popupMenu = new JPopupMenu();
popupMenu.removeAll();
popupMenu.setOpaque(false);
popupMenu.setBorder(null);
popupMenu.add(list = createSuggestionList(position, subWord), BorderLayout.CENTER);
popupMenu.show(textarea, location.x, textarea.getBaseline(0, 0) + location.y);
}
public void hide() {
popupMenu.setVisible(false);
if (suggestion == this) {
suggestion = null;
}
}
private JList createSuggestionList(final int position, final String subWord) {
String[] data = searchForWord(dictionaryFilePath, subWord + "*", 10);
JList list = new JList(data);
list.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setBackground(Color.decode("#FBFEC3")); //light-yellow
list.setSelectedIndex(0);
list.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
insertSelection();
textarea.requestFocus();
hideSuggestion();
}
}
});
return list;
}
public boolean insertSelection() {
if (list.getSelectedValue() != null) {
try {
final String selectedSuggestion = ((String) list.getSelectedValue()).substring(subWord.length());
textarea.getDocument().insertString(insertionPosition, selectedSuggestion, null);
return true;
}
catch (BadLocationException e1) {
e1.printStackTrace();
}
hideSuggestion();
}
return false;
}
public void moveUp() {
int index = Math.min(list.getSelectedIndex() - 1, 0);
selectIndex(index);
}
public void moveDown() {
int index = Math.min(list.getSelectedIndex() + 1, list.getModel().getSize() - 1);
selectIndex(index);
}
private void selectIndex(int index) {
final int position = textarea.getCaretPosition();
list.setSelectedIndex(index);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
textarea.setCaretPosition(position);
}
});
}
public String[] searchForWord(String dictionaryFilePath, String searchCriteria, int numberOfWordsToReturn) {
// This method ignores letter case!
List<String> foundList = new ArrayList<>(); // To hold all found words.
// Convert the supplied criteria string to a Regular Expression
// for the String#matches() method located in the 'while' loop.
String regEx = searchCriteria.replace("?", ".").replace("-", ".").replace("*", ".*?").toLowerCase();
// 'Try With Resources' use here to auto-close the reader.
try (BufferedReader reader = new BufferedReader(new FileReader(dictionaryFilePath))) {
String line = "";
int counter = 0;
while ((line = reader.readLine()) != null) {
line = line.trim().toLowerCase();
if (line.matches(regEx)) {
counter++;
foundList.add(line); // There's a match...add to the List.
if (counter == numberOfWordsToReturn) {
break;
}
}
}
}
// catch Exceptions (if any).
catch (FileNotFoundException ex) {
System.err.println(ex);
}
catch (IOException ex) {
System.err.println(ex);
}
return foundList.toArray(new String[0]); // Return the Array.
}
}
private SuggestionPanel suggestion;
private JTextArea textarea;
protected void showSuggestionLater() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
showSuggestion();
}
});
}
protected void showSuggestion() {
hideSuggestion();
final int position = textarea.getCaretPosition();
Point location;
try {
location = textarea.modelToView(position).getLocation();
}
catch (BadLocationException e2) {
e2.printStackTrace();
return;
}
String text = textarea.getText();
int start = Math.max(0, position - 1);
while (start > 0) {
if (!Character.isWhitespace(text.charAt(start))) {
start--;
}
else {
start++;
break;
}
}
if (start > position) {
return;
}
final String subWord = text.substring(start, position);
if (subWord.length() < 2) {
return;
}
suggestion = new SuggestionPanel(textarea, position, subWord, location);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
textarea.requestFocusInWindow();
}
});
}
private void hideSuggestion() {
if (suggestion != null) {
suggestion.hide();
}
}
protected void initUI() {
final JFrame frame = new JFrame();
frame.setTitle("Word Assist");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new BorderLayout());
textarea = new JTextArea(24, 80);
textarea.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
textarea.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_ENTER) {
if (suggestion != null) {
if (suggestion.insertSelection()) {
e.consume();
final int position = textarea.getCaretPosition();
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
textarea.getDocument().remove(position - 1, 1);
}
catch (BadLocationException e) {
e.printStackTrace();
}
}
});
}
}
}
}
@Override
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_DOWN && suggestion != null) {
suggestion.moveDown();
}
else if (e.getKeyCode() == KeyEvent.VK_UP && suggestion != null) {
suggestion.moveUp();
}
else if (Character.isLetterOrDigit(e.getKeyChar())) {
showSuggestionLater();
}
else if (Character.isWhitespace(e.getKeyChar())) {
hideSuggestion();
}
}
@Override
public void keyPressed(KeyEvent e) {
}
});
panel.add(textarea, BorderLayout.CENTER);
frame.add(panel);
frame.pack();
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new WordAssist().initUI();
}
});
}
}
Just start a new Java Application project named WordAssist and paste this code into it. It may not be exactly what you want but is should give you a pretty good idea of how to accomplish what you do want.
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Origin http://43.154.161.224:23101/article/api/json?id=366980&siteId=1