プログラムがすべきこと:
ユーザーが単語マネージャー GUI ウィンドウのリストから単語を選択して「削除」ボタンをクリックした後、単語リストから別の項目 (任意の項目) を選択する必要があります (GUI で強調表示されます)。リストから一連の単語を削除するには、前後にクリックします。
問題をさらに説明するために、次のコード スニペットを参照してください。
logic.words.remove(w);
logic.save_words_to_disk();
populate_list();
word_list.setSelectedIndex(0); //doesn't make the selection in the list
上記のコード スニペットを使用して、ブラウザーで「検索」検索を実行し、参照しているコードのセクションを見つけることもできます。また、私が言いたいことを説明するために、リストには事前にいくつかの項目を入力する必要があります (これをテストするとき、空のリストは明らかに機能しません)。
何が起こるのですか：
選択した単語は削除されますが、メソッド呼び出し word_list.setSelectedIndex(...) は、呼び出された後に何も選択されていないため、明らかに効果がありません。メソッド getSelectedIndex() も機能しませんが、回避策 (リスト選択リスナー) を使用して、リストで現在選択されているインデックスを取得しましたが、醜い (エレガントではありません)。
私の質問：
私は何を間違っていますか？簡単なプログラムでセット リスト選択方法を試してみたところ、問題なく動作しましたが、何らかの理由でメイン プロジェクトでは動作しません。メイン プロジェクトと簡単なテスト プロジェクトの両方の完全なソース コードを以下に掲載しました。
どんな助けでも大歓迎です。ありがとう！
---メインプロジェクト---
package spellingbee;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.*;
import java.util.ArrayList;
import java.util.Random;
import javax.sound.sampled.*;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class SpellingBee {
public static void main(String[] args) {
//create objects
GUI gui = new GUI();
Logic logic = new Logic();
//link objects
gui.logic = logic;
logic.gui = gui;
AudioRecorder.logic = logic;
//start program
AudioRecorder.init();
gui.initialize();
logic.load_words_from_disk();
logic.choose_word();
logic.prompt_word();
}
}
class GUI {
//this link is set externally
public Logic logic = null;
public WordManager word_manager = null;
public MainGUI main_gui = null;
public void initialize() {
main_gui = new MainGUI();
word_manager = new WordManager();
}
public void show_word_manager() {
word_manager.populate_list();
word_manager.window.setLocationRelativeTo(main_gui.window);
word_manager.window.setVisible(true);
}
class MainGUI {
public JLabel input_label = null;
public JLabel last_word_label = null;
JFrame window = null;
public MainGUI() {
window = new JFrame("Spelling Bee");
window.addKeyListener(new Keyboard());
window.setLayout(new BorderLayout());
input_label = new JLabel("", JLabel.CENTER);
input_label.setFont(new Font("", Font.PLAIN, 32));
input_label.setFocusable(false);
input_label.setPreferredSize(new Dimension(400, 100));
last_word_label = new JLabel("", JLabel.CENTER);
last_word_label.setFont(new Font("", Font.ITALIC, 16));
last_word_label.setFocusable(false);
last_word_label.setPreferredSize(new Dimension(400, 30));
JLabel help_label_1 = new JLabel("Press '0' to hear the current word.", JLabel.CENTER);
JLabel help_label_2 = new JLabel("Press '1' to manage word list.", JLabel.CENTER);
JPanel help_panel = new JPanel(new GridLayout(2, 1));
help_panel.add(help_label_1);
help_panel.add(help_label_2);
window.getContentPane().add(input_label, BorderLayout.CENTER);
window.getContentPane().add(last_word_label, BorderLayout.NORTH);
window.getContentPane().add(help_panel, BorderLayout.SOUTH);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.pack();
window.setLocationRelativeTo(null);
window.setVisible(true);
}
}
class WordManager {
public JDialog window = null;
public JList word_list = null;
public DefaultListModel list_model = null;
public JButton delete_button = null;
public JButton record_button = null;
public int list_selection;
public JTextField input_field = null;
public WordManager() {
window = new JDialog(main_gui.window, "Word Viewer", true);
//window.setPreferredSize(new Dimension(300, 300));
list_model = new DefaultListModel();
DefaultListSelectionModel dlsm = new DefaultListSelectionModel();
dlsm.clearSelection();
word_list = new JList(list_model);
word_list.setSelectionModel(dlsm);
word_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
word_list.addListSelectionListener(new SelectionManager());
JScrollPane word_list_scroll_pane = new JScrollPane(word_list);
word_list_scroll_pane.setPreferredSize(new Dimension(150, 300));
ButtonManager button_manager = new ButtonManager();
delete_button = new JButton("Delete");
delete_button.setActionCommand("delete_button");
delete_button.addActionListener(button_manager);
//delete_button.setPreferredSize(new Dimension(100,30));
record_button = new JButton("Record");
record_button.setActionCommand("start_record");
record_button.addActionListener(button_manager);
input_field = new JTextField(15);
JPanel record_panel = new JPanel(new GridLayout(2, 1));
record_panel.add(input_field);
record_panel.add(record_button);
JPanel east_panel = new JPanel(new BorderLayout());
east_panel.add(delete_button, BorderLayout.SOUTH);
east_panel.add(record_panel, BorderLayout.NORTH);
window.setLayout(new BorderLayout());
window.add(word_list_scroll_pane, BorderLayout.WEST);
window.add(east_panel, BorderLayout.EAST);
window.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE);
window.pack();
window.setLocationRelativeTo(main_gui.window);
}
public void populate_list() {
//this code creates a thread on the event dispatch thread
//which is needed for gui actions. not doing this for gui
//operations can cause unpredictable errors that are
//difficult to reproduce
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
populate_list_helper();
}
});
}
private void populate_list_helper() {
//this line will determine whether or not a block of code is running
//on the event dispatching thread
//System.out.println(javax.swing.SwingUtilities.isEventDispatchThread());
list_model.clear();
for (Word w : logic.words) {
list_model.addElement(w.spelling);
}
}
class SelectionManager implements ListSelectionListener {
@Override
public void valueChanged(ListSelectionEvent e) {
list_selection = e.getFirstIndex();
}
}
class ButtonManager implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String action_command = e.getActionCommand();
if (action_command.equals("delete_button")) {
int selection = list_selection;
if (selection != -1) {
String selected_string = word_list.getModel().getElementAt(selection).toString();
for (Word w : logic.words) {
if (w.spelling.equals(selected_string)) {
logic.words.remove(w);
logic.save_words_to_disk();
populate_list();
word_list.setSelectedIndex(0);
return;
}
}
}
} else if (action_command.equals("start_record")) {
if (!input_field.getText().isEmpty()) {
record_button.setActionCommand("stop_record");
record_button.setText("Stop Recording");
logic.start_recording();
} else {
SoundPlayer.play("wrong.wav");
}
} else if (action_command.equals("stop_record")) {
record_button.setActionCommand("start_record");
logic.stop_recording();
record_button.setText("Record");
input_field.grabFocus();
input_field.selectAll();
}
}
}
}
class Keyboard extends KeyAdapter {
@Override
public void keyTyped(KeyEvent e) {
logic.process_keyboard_input(e);
}
}
}
class Logic {
public GUI gui = null;
ArrayList<Word> words = new ArrayList<Word>();
Word current_word = null;
//public byte[] sound_data = null;
public void save_words_to_disk() {
try {
FileOutputStream fos = new FileOutputStream("src\\spellingbee\\words.dat");
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(words);
oos.close();
} catch (Exception e) {
System.err.println("save_words_to_disk: " + e);
}
}
public void load_words_from_disk() {
try {
FileInputStream fis = new FileInputStream("src\\spellingbee\\words.dat");
ObjectInputStream ois = new ObjectInputStream(fis);
words = (ArrayList<Word>) ois.readObject();
ois.close();
} catch (Exception e) {
System.err.println("load_words_from_disk: " + e);
}
}
public void start_recording() {
AudioRecorder.captureAudio();
}
public void stop_recording() {
AudioRecorder.stopCapture = true;
}
public void process_new_word(byte[] sound_data) {
Word temp_word = new Word(gui.word_manager.input_field.getText(), sound_data);
words.add(temp_word);
temp_word.play();
if (words.size() == 1) {
choose_word();
}
gui.word_manager.populate_list();
save_words_to_disk();
}
public void choose_word() {
if (current_word != null) {
String old_word = current_word.spelling;
if (words.size() > 1) {
while (old_word.equals(current_word.spelling)) {
current_word = words.get(new Random().nextInt(words.size()));
}
} else {
current_word = words.get(0);
}
} else {
if (words.size() > 0) {
current_word = words.get(new Random().nextInt(words.size()));
}
}
}
public void prompt_word() {
if (current_word != null) {
current_word.play();
}
}
public void process_keyboard_input(KeyEvent e) {
char user_input = e.getKeyChar();
//verify input
if (!input_ok(user_input)) {
return;
}
switch (user_input) {
case '0':
prompt_word();
return;
case '1':
gui.show_word_manager();
return;
default:
break;
}
String result_string = gui.main_gui.input_label.getText();
gui.main_gui.input_label.setText(result_string + Character.toString(user_input));
result_string = gui.main_gui.input_label.getText();
String answer_string = current_word.spelling;
if (result_string.equalsIgnoreCase(answer_string)) {
SoundPlayer.play("ding.wav");
gui.main_gui.last_word_label.setText(gui.main_gui.input_label.getText().toLowerCase());
gui.main_gui.input_label.setText("");
choose_word();
prompt_word();
}
//check to see if input is correct so far
int result_length = result_string.length();
String partial_result = result_string.substring(0, result_length);
String partial_answer = answer_string.substring(0, result_length);
if (!partial_result.equalsIgnoreCase(partial_answer)) {
SoundPlayer.play("wrong.wav");
gui.main_gui.input_label.setText("");
}
}
public boolean input_ok(char input_value) {
boolean result = false;
switch (new Character(input_value).toString().toLowerCase().charAt(0)) {
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
case '0':
case '1':
result = true;
}
return result;
}
}
class Word implements Serializable {
public String spelling = null;
public byte[] audio_data = null;
public Word(String spelling, byte[] audio_data) {
this.spelling = spelling;
this.audio_data = audio_data;
System.out.println("");
}
public void play() {
SoundPlayer.play_data(audio_data);
}
}
class SoundPlayer {
static AudioFormat audio_format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 44100.0F, 16, 2, 4, 44100.0F, false);
static public void play(String path) {
try {
Clip clip = AudioSystem.getClip();
InputStream audio_src = SpellingBee.class.getResourceAsStream(path);
InputStream buffered_in = new BufferedInputStream(audio_src);
AudioInputStream audioStream = AudioSystem.getAudioInputStream(buffered_in);
clip.open(audioStream);
clip.start();
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
static public void play_data(byte[] data) {
Clip clip = null;
try {
clip = AudioSystem.getClip();
} catch (Exception e) {
System.err.println("1 " + e.getMessage());
}
try {
clip.open(audio_format, data, 0, data.length);
} catch (LineUnavailableException e) {
System.err.println("2a " + e.getMessage());
} catch (IllegalArgumentException e) {
System.err.println("2b " + e.getMessage());
} catch (IllegalStateException e) {
System.err.println("2c " + e.getMessage());
} catch (SecurityException e) {
System.err.println("2d " + e.getMessage());
}
try {
clip.start();
} catch (Exception e) {
System.err.println("3 " + e.getMessage());
}
}
}
class AudioRecorder {
static boolean stopCapture = false;
static ByteArrayOutputStream byteArrayOutputStream;
static AudioFormat audioFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 44100.0F, 16, 2, 4, 44100.0F, false);
static TargetDataLine targetDataLine;
static private byte[] audioData = null;
public static Logic logic = null;
static public byte[] get_audio_data() {
return audioData;
}
static public void init() {
try {
DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
targetDataLine = (TargetDataLine) AudioSystem.getLine(dataLineInfo);
targetDataLine.open(audioFormat);
} catch (Exception e) {
System.err.println(e);
}
}
static public void captureAudio() {
try {
targetDataLine.start();
//Create a thread to capture the microphone data and start it
//running. It will run until the Stop button is clicked.
Thread captureThread = new Thread(new CaptureThread());
captureThread.start();
} catch (Exception e) {
System.out.println("4 " + e);
System.exit(0);
}//end catch
}//end captureAudio method
static class CaptureThread extends Thread {
//An arbitrary-size temporary holding buffer
byte tempBuffer[] = new byte[10000];
@Override
public void run() {
byteArrayOutputStream = new ByteArrayOutputStream();
stopCapture = false;
try {
//stopCapture will be set by another thread
while (!stopCapture) {
//Read data from the internal buffer of the data line.
int cnt = targetDataLine.read(tempBuffer, 0, tempBuffer.length);
if (cnt > 0) {
byteArrayOutputStream.write(tempBuffer, 0, cnt);
}
}
byteArrayOutputStream.close();
audioData = byteArrayOutputStream.toByteArray();
logic.process_new_word(audioData);
System.out.println();
} catch (Exception e) {
System.out.println("capture thread " + e);
System.exit(0);
}//end catch
}//end run
}//end inner class CaptureThread
}//end outer class AudioCapture01.java
---テストプロジェクト---
package testing;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
public class Testing {
public static void main(String[] args) {
JFrame frame = new JFrame();
String[] items = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k"};
final JList list = new JList(items);
list.setPreferredSize(new Dimension(200,200));
frame.setLayout(new BorderLayout());
JButton button = new JButton("select random item");
button.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e) {
list.setSelectedIndex(new Random().nextInt(11));
}
}
);
frame.getContentPane().add(list, BorderLayout.CENTER);
frame.getContentPane().add(button, BorderLayout.EAST);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}