我正在制作一个自动填充应用程序，我的单词列表来自我的数据库。我有一个文本字段，现在我想制作一个建议列表，每次输入内容时都会显示在字段下方。你能给我一些提示或想法怎么做吗？提前谢谢。
答案 0 :(得分：1)
如果你使用JCombobox会更好，但如果你使用的是Jtextfield，我建议你使用Jlist并放入JWindow，因为你使用的是textfield，这就是我在Dictionary应用程序中尝试过的。
编辑：
public class MainMenu extends JPanel
{
private final Connection connection;
private final Application application;
private JTextField word = new JTextField(10);
private final JButton translate = new JButton();
private final JComboBox translators = new JComboBox();
private final JButton search = new JButton();
private JList speechPartAndDefinitionWidget;
private final DefaultListModel speechPartAndDefinitionWidgetModel = new DefaultListModel();
private Translator translator;
private Suggestor suggestor;
private DefaultListModel translatedWidgetModel;
private JList translatedWidget;
private final DefaultListModel suggestionWidgetModel = new DefaultListModel();
private final JList suggestionWidget = new JList(suggestionWidgetModel);
private JavaWindow javaWindow = new JavaWindow(suggestionWidget);
public MainMenu(Application application, Connection connection)
{
word.getDocument().addDocumentListener(new DocumentListener()
{
public void insertUpdate(DocumentEvent e)
{
try
{
onWordUpdated(word.getText());
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
public void removeUpdate(DocumentEvent e)
{
try
{
onWordUpdated(word.getText());
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
public void changedUpdate(DocumentEvent e)
{
try
{
onWordUpdated(word.getText());
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
});
this.application = application;
this.connection = connection;
translators.setFocusable(false);
word.grabFocus();
word.requestFocus();
word.setFocusable(true);
search.setText("<html><b><u>S</u>earch</b></html>");
translate.setText("<html><b><u>T</u>ranslate</b></html>");
translators.addItem(new EnglishBisayaTranslator(connection));
setToolTipText("English-Bisaya");
translators.addItem(new BisayaEnglishTranslator(connection));
setToolTipText("Bisaya-English");
setLayout(new BorderLayout());
JPanel formX = new JPanel();
formX.setLayout(new BorderLayout());
JPanel header = new JPanel();
header.setLayout(new GridBagLayout());
header.add(translators);
header.add(word);
header.add(search);
header.add(translate);
translators.setBorder(BorderFactory.createEtchedBorder(1));
translators.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 10));
word.setBorder(BorderFactory.createEtchedBorder());
word.setBorder(BorderFactory.createLineBorder(Color.gray, 1));
word.setFont(new Font("Garamond", Font.BOLD, 17));
suggestionWidget.setFont(new Font("Calibri", Font.BOLD, 17));
header.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 8));
formX.add(BorderLayout.PAGE_START, header);
formX.setBorder(BorderFactory.createEmptyBorder(10, 15, 10, 10));
add(header, BorderLayout.NORTH);
speechPartAndDefinitionWidget = new JList(speechPartAndDefinitionWidgetModel);
speechPartAndDefinitionWidget.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
speechPartAndDefinitionWidget.addListSelectionListener(new ListSelectionListener()
{
public void valueChanged(ListSelectionEvent ev)
{
onDefinitionSelected(ev);
}
});
JPanel formBottom = new JPanel();
formBottom.setLayout(new GridBagLayout());
add(formBottom, BorderLayout.CENTER);
Component up = new JScrollPane(speechPartAndDefinitionWidget);
formBottom.setBorder(BorderFactory.createEmptyBorder(20, 10, 10, 10)); speechPartAndDefinitionWidget.setBorder(BorderFactory.createLineBorder(Color.black,1));
JPanel down = new JPanel();
down.setLayout(new BorderLayout());
down.setBorder(BorderFactory.createLineBorder(Color.black, 1));
down.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
down.add(translatedWidget = new JList(translatedWidgetModel = new DefaultListModel()));
add(down, BorderLayout.CENTER);
translatedWidget.setBorder(BorderFactory.createLineBorder(Color.black, 1));
translatedWidget.setFont(new Font("Calibri",Font.BOLD, 17));
speechPartAndDefinitionWidget.setFont(new Font("Calibri", Font.BOLD, 17));
add(BorderLayout.CENTER, new JSplitPane(JSplitPane.VERTICAL_SPLIT, up, down));
word.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ESCAPE)
{
hideSuggestionWindowToBack();
}
else if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
int selectedIndex = suggestionWidget.getSelectedIndex();
if (selectedIndex == -1)
{
onSearchClick();
}
else
{
onSuggestionSelected(selectedIndex);
}
}
}
public void keyReleased(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
hideSuggestionWindowToBack();
onSearchClick();
}
}
});
translators.addActionListener(new
ActionListener()
{
public void actionPerformed
(ActionEvent e)
{
onTranslatorsClick();
}
}
);
word.addKeyListener(new
KeyAdapter()
{
public void keyPressed
(KeyEvent
e)
{
if (suggestionWidgetModel.isEmpty())
{
return;
}
if (e.getKeyCode() == KeyEvent.VK_DOWN)
{
final Point location = word.getLocationOnScreen();
javaWindow.setLocation(location.x, location.y + word.getHeight());
showSuggestionWindowToBack();
int currentSelectedItemIndex = suggestionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == suggestionWidgetModel.size() - 1)
{
suggestionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < suggestionWidgetModel.size() - 1)
{
suggestionWidget.setSelectedIndex(currentSelectedItemIndex + 1);
}
}
else if (e.getKeyCode() == KeyEvent.VK_UP)
{
int currentSelectedItemIndex = suggestionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == suggestionWidgetModel.size() + 1)
{
suggestionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < suggestionWidgetModel.size() + 1)
{
suggestionWidget.setSelectedIndex(currentSelectedItemIndex - 1);
}
}
}
}
);
suggestionWidget.addMouseListener(new MouseAdapter()
{
@Override
public void mousePressed(MouseEvent e)
{
int selectedIndex = suggestionWidget.getSelectedIndex();
if (e.getClickCount() == 2)
{
if (selectedIndex < -1)
{
onSearchClick();
}
else
{
onSuggestionSelected(selectedIndex);
hideSuggestionWindowToBack();
}
}
}
public void mouseReleased(MouseEvent e)
{
if (e.getClickCount() == 2)
{
{
hideSuggestionWindowToBack();
}
}
}
});
speechPartAndDefinitionWidget.addKeyListener(new
KeyAdapter()
{
@Override
public void keyPressed
(KeyEvent
e)
{
if (speechPartAndDefinitionWidgetModel.isEmpty())
{
return;
}
if (e.getKeyCode() == KeyEvent.VK_DOWN)
{
int currentSelectedItemIndex = speechPartAndDefinitionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == speechPartAndDefinitionWidgetModel.size() - 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < speechPartAndDefinitionWidgetModel.size() - 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(currentSelectedItemIndex + 1);
onTranslate();
}
}
else if (e.getKeyCode() == KeyEvent.VK_UP)
{
int currentSelectedItemIndex = speechPartAndDefinitionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == speechPartAndDefinitionWidgetModel.size() + 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < speechPartAndDefinitionWidgetModel.size() + 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(currentSelectedItemIndex - 1);
}
}
}
}
);
speechPartAndDefinitionWidget.addMouseMotionListener(new MouseMotionAdapter()
{
@Override
public void mouseMoved(MouseEvent e)
{
final int x = e.getX();
final int y = e.getY();
final Rectangle cellBounds = speechPartAndDefinitionWidget.getCellBounds(0, speechPartAndDefinitionWidget.getModel().getSize() - 1);
if (cellBounds != null && cellBounds.contains(x, y))
{
speechPartAndDefinitionWidget.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
else
{
speechPartAndDefinitionWidget.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
}
}
);
speechPartAndDefinitionWidget.setCellRenderer(new
DefaultListCellRenderer()
{
@Override
public Component getListCellRendererComponent
(JList
list, Object
value, int index,
boolean isSelected,
boolean cellHasFocus)
{
final String speechPart = ((DefinitionUiModel) value).getPart().getFriendlyName();
final String definition = ((DefinitionUiModel) value).getDefinition().toString();
Color bg = null;
Color fg = null;
final JLabel renderer = new JLabel(
"<html><font color=red>" + speechPart + "</font>) => <font color=black>" + definition + "</font></html>");
if (renderer.isEnabled())
{
if (isSelected)
{
renderer.setText("<html><font color=gray>" + speechPart + "</font><font color=blue><u><b>" + definition + "</b></u></font></html>");
renderer.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
JList.DropLocation dropLocation = list.getDropLocation();
if (dropLocation != null
&& !dropLocation.isInsert()
&& dropLocation.getIndex() == index)
{
bg = DefaultLookup.getColor(this, ui, "List.dropCellBackground");
fg = DefaultLookup.getColor(this, ui, "List.dropCellForeground");
isSelected = true;
}
if (isSelected)
{
renderer.setBackground(bg == null ? list.getSelectionBackground() : bg);
renderer.setForeground(fg == null ? list.getSelectionForeground() : fg);
}
Border border = null;
if (cellHasFocus)
{
if (isSelected)
{
border = DefaultLookup.getBorder(this, ui, "List.focusSelectedCellHighlightBorder");
}
if (border == null)
{
border = DefaultLookup.getBorder(this, ui, "List.focusCellHighlightBorder");
}
}
else
{
}
}
return renderer;
}
}
);
translatedWidget.setForeground(Color.black);
translate.addActionListener(new
ActionListener()
{
public void actionPerformed
(ActionEvent
e)
{
onTranslate();
}
}
);
search.setToolTipText("find");
search.addActionListener(new
ActionListener()
{
public void actionPerformed
(ActionEvent
e)
{
onSearchClick();
}
}
);
translators.setSelectedIndex(0);
suggestionWidget.setBorder(BorderFactory.createLineBorder(Color.gray, 1));
onTranslatorsClick();
}
private void onSuggestionSelected(int selectedIndex)
{
String hold = (String) suggestionWidgetModel.getElementAt(selectedIndex);
word.setText(hold);
hideSuggestionWindowToBack();
suggestionWidgetModel.clear();
if (javaWindow == null)
{
javaWindow.dispose();
javaWindow = null;
}
}
public void onWordUpdated(final String toComplete) throws ClassNotFoundException, SQLException
{
new Thread(new Runnable()
{
public void run()
{
try
{
final List<Suggestion> suggestions = suggestor.getSuggestions(toComplete);
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
speechPartAndDefinitionWidgetModel.clear();
translatedWidgetModel.clear();
suggestionWidgetModel.clear();
try
{
for (Suggestion suggestion : suggestions)
{
suggestionWidgetModel.addElement(suggestion.getCaption());
}
if (!suggestions.isEmpty())
{
suggestionWidget.setSelectedIndex(0);
if (javaWindow == null)
{
javaWindow = new JavaWindow(suggestionWidget);
}
else
{
final Point location = word.getLocationOnScreen();
javaWindow.setLocation(location.x, location.y + word.getHeight());
}
showSuggestionWindowToBack();
}
else
{
hideSuggestionWindowToBack();
}
}
catch (Exception exception)
{
exception.printStackTrace();
}
}
});
}
catch (SQLException e)
{
onSqlError(e);
}
}
}
, "onWordUpdated").
start();
}
private void onTranslate()
{
try
{
translatedWidgetModel.clear();
String lookupWord = word.getText();
if (lookupWord != null)
{
Collection<String> bisayaWords = this.translator.translateSimple(lookupWord);
for (String bisayaWord : bisayaWords)
{
translatedWidgetModel.addElement(bisayaWord.toUpperCase());
}
}
}
catch (SQLException ex)
{
onSqlError(ex);
}
}
private void onSqlError(SQLException ex)
{
JOptionPane.showMessageDialog(null, "SQL Error! :" + ex.getMessage());
}
private void onDefinitionSelected(ListSelectionEvent ev)
{
if (!ev.getValueIsAdjusting())
{
int selectedIndex = speechPartAndDefinitionWidget.getSelectedIndex();
if (selectedIndex != -1)
{
final DefinitionUiModel definitionUiModel = (DefinitionUiModel) speechPartAndDefinitionWidgetModel.get(selectedIndex);
translate(definitionUiModel.getDefinition());
}
}
}
private void translate(Definition definition)
{
try
{
translatedWidgetModel.clear();
Map<String, String> map = new HashMap<String, String>();
int definitionId = definition.getId();
String definitionName = definition.getValue();
int nameId = translator.getFromDictionary().getNameIdForDefinitionId(definitionId);
if (nameId > -1)
{
final Collection<String> translation = translator.translateSimple(nameId);
for (String transWord : translation)
{
map.put(transWord, definitionName);
for (Map.Entry<String, String> entry : map.entrySet())
{
String myValue = entry.getKey().toUpperCase() + " -- " + entry.getValue();
translatedWidgetModel.addElement(myValue);
}
}
}
}
catch (SQLException ex)
{
onSqlError(ex);
}
}
private void onSearchClick()
{
search.setEnabled(true);
hideSuggestionWindowToBack();
speechPartAndDefinitionWidgetModel.clear();
translatedWidgetModel.clear();
try
{
final String lookupWord = word.getText();
if (lookupWord != null)
{
final Dictionary fromDictionary = translator.getFromDictionary();
final WordDefinitions definitions = fromDictionary.getWordDefinitions(lookupWord);
final Iterator<Map.Entry<SpeechPart, List<Definition>>> items = definitions.iterator();
while (items.hasNext())
{
final Map.Entry<SpeechPart, List<Definition>> item = items.next();
for (Definition definition : item.getValue())
{
speechPartAndDefinitionWidgetModel.addElement(new DefinitionUiModel(item.getKey(), definition));
}
}
}
}
catch (SQLException ex)
{
onSqlError(ex);
}
}
private void onTranslatorsClick()
{
translator = (Translator) translators.getSelectedItem();
suggestor = new Suggestor(translator.getFromDictionary(), 10);
word.setEnabled(true);
application.setTitle(translator.toString());
translators.setToolTipText("tooltip : " + translator.toString());
speechPartAndDefinitionWidgetModel.clear();
}
private void hideSuggestionWindowToBack()
{
if (javaWindow == null)
{
return;
}
javaWindow.setVisible(false);
javaWindow.toBack();
}
private void showSuggestionWindowToBack()
{
if (javaWindow == null)
{
return;
}
javaWindow.setVisible(true);
javaWindow.toFront();
}
}
答案 1 :(得分：0)
建议列表后面的算法（我知道）是：Longest common substring problem。如果您以trie的形式将字符串存储在数据库中，则问题非常简单。然后，当前前缀的建议列表将是以当前输入的字符串开头的所有字符串。如果你看看Trie数据结构，你会理解我的意思。