使用JScrollPane自定义CellEditor – 开始编辑问题
我有一个JTable，它使用自定义CellEditor，在JScrollPane中使用JTextArea。 当我通过鼠标clic进入编辑模式时，它完美地工作。 但是，当我尝试在单元格聚焦时键入一些字母时，没有任何反应。 单元格获得“编辑模式样式”（背景更改），但保持空白…
任何的想法 ？
public class MultiLineCellEditor extends DefaultCellEditor { JTextArea textArea; JScrollPane scrollPane; public MultiLineCellEditor( final JTable table ) { super( new JTextField() ); getComponent().setName( "Table.editor" ); setClickCountToStart( 2 ); textArea = new JTextArea(); scrollPane = new JScrollPane(); scrollPane.setViewportView( textArea ); editorComponent = scrollPane; }//end MultiLineCellEditor public Component getTableCellEditorComponent( JTable table, Object value, boolean isSelected, int row, int column ) { this.setValue( value ); scrollPane.setBorder( new LineBorder( Color.black ) ); return scrollPane; } public void setValue( Object value ) { textArea.setText( ( value != null ) ? value.toString() : "" ); } public Object getCellEditorValue() { return textArea.getText(); } }//end class 这是我的测试代码：
import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class MultiLineCellEditorTest { public JComponent makeUI() { String[] columnNames = {"JTextField", "JTextArea"}; Object[][] data = { {"aaa", "JTextArea+JScrollPane\nCtrl-Enter: stopCellEditing"}, {"bbb", "ggg"}, {"ccccDDD", "hhh\njjj\nkkk"} }; TableModel model = new DefaultTableModel(data, columnNames) { @Override public Class getColumnClass(int column) { return String.class; } }; JTable table = new JTable(model) { @Override public void updateUI() { super.updateUI(); TableColumn col = getColumnModel().getColumn(1); col.setCellEditor(new TextAreaCellEditor()); col.setCellRenderer(new TextAreaCellRenderer()); } }; table.setAutoCreateRowSorter(true); table.setSurrendersFocusOnKeystroke(true); table.setRowHeight(64); return new JScrollPane(table); } public static void main(String... args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { createAndShowGUI(); } }); } public static void createAndShowGUI() { JFrame f = new JFrame(); f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); f.getContentPane().add(new MultiLineCellEditorTest().makeUI()); f.setSize(320, 240); f.setLocationRelativeTo(null); f.setVisible(true); } } class TextAreaCellRenderer implements TableCellRenderer { private final JTextArea textArea = new JTextArea(); public TextAreaCellRenderer() { textArea.setLineWrap(true); textArea.setBorder(BorderFactory.createEmptyBorder(1, 5, 1, 5)); } @Override public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { if (isSelected) { textArea.setForeground(table.getSelectionForeground()); textArea.setBackground(table.getSelectionBackground()); } else { textArea.setForeground(table.getForeground()); textArea.setBackground(table.getBackground()); } textArea.setFont(table.getFont()); textArea.setText(Objects.toString(value, "")); return textArea; } } //class TextAreaCellEditor extends AbstractCellEditor implements TableCellEditor { class TextAreaCellEditor implements TableCellEditor { private static final String KEY = "Stop-Cell-Editing"; private final JScrollPane scroll; private final JTextArea textArea = new JTextArea(); public TextAreaCellEditor() { //super(); scroll = new JScrollPane(textArea); scroll.setBorder(BorderFactory.createEmptyBorder()); textArea.setLineWrap(true); textArea.setBorder(BorderFactory.createEmptyBorder(1, 5, 1, 5)); KeyStroke enter = KeyStroke.getKeyStroke( KeyEvent.VK_ENTER, InputEvent.CTRL_MASK); textArea.getInputMap(JComponent.WHEN_FOCUSED).put(enter, KEY); textArea.getActionMap().put(KEY, new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { stopCellEditing(); } }); } @Override public Object getCellEditorValue() { return textArea.getText(); } @Override public Component getTableCellEditorComponent( JTable table, Object value, boolean isSelected, int row, int column) { System.out.println("2. getTableCellEditorComponent"); textArea.setFont(table.getFont()); textArea.setText(Objects.toString(value, "")); EventQueue.invokeLater(new Runnable() { @Override public void run() { textArea.setCaretPosition(textArea.getText().length()); textArea.requestFocusInWindow(); System.out.println("4. invokeLater: getTableCellEditorComponent"); } }); return scroll; } @Override public boolean isCellEditable(final EventObject e) { if (e instanceof MouseEvent) { return ((MouseEvent) e).getClickCount() >= 2; } System.out.println("1. isCellEditable"); EventQueue.invokeLater(new Runnable() { @Override public void run() { if (e instanceof KeyEvent) { KeyEvent ke = (KeyEvent) e; char kc = ke.getKeyChar(); if (Character.isUnicodeIdentifierStart(kc)) { textArea.setText(textArea.getText() + kc); System.out.println("3. invokeLater: isCellEditable"); } } } }); return true; } //Copid from AbstractCellEditor protected EventListenerList listenerList = new EventListenerList(); transient protected ChangeEvent changeEvent = null; @Override public boolean shouldSelectCell(EventObject e) { return true; } @Override public boolean stopCellEditing() { fireEditingStopped(); return true; } @Override public void cancelCellEditing() { fireEditingCanceled(); } @Override public void addCellEditorListener(CellEditorListener l) { listenerList.add(CellEditorListener.class, l); } @Override public void removeCellEditorListener(CellEditorListener l) { listenerList.remove(CellEditorListener.class, l); } public CellEditorListener[] getCellEditorListeners() { return listenerList.getListeners(CellEditorListener.class); } protected void fireEditingStopped() { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); // Process the listeners last to first, notifying // those that are interested in this event for(int i = listeners.length-2; i>=0; i-=2) { if(listeners[i]==CellEditorListener.class) { // Lazily create the event: if(changeEvent == null) changeEvent = new ChangeEvent(this); ((CellEditorListener)listeners[i+1]).editingStopped(changeEvent); } } } protected void fireEditingCanceled() { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); // Process the listeners last to first, notifying // those that are interested in this event for(int i = listeners.length-2; i>=0; i-=2) { if(listeners[i]==CellEditorListener.class) { // Lazily create the event: if(changeEvent == null) changeEvent = new ChangeEvent(this); ((CellEditorListener)listeners[i+1]).editingCanceled(changeEvent); } } } }
编辑：将inheritance替换为委派