java - 是否可以在 Java Netbeans 上制作渲染的 jTextArea "format editable"？ (使用 Enter 和 Tab 键)

Question

我在 jTable 单元格内渲染 jTextArea，渲染时，jTextArea 单元格使用“Enter”键作为行的接受和更改，而“Tab”键则转到下一个单元格(右侧的单元格)。 我需要的是将它用作普通的 jTextArea，其中“Enter”是换行符，“Tab”是表格。 我认为需要设置一些属性，但我不知道哪些属性。

这是我正在使用的代码:

    //Renderer

    public class TableCellLongTextRenderer extends JTextArea implements TableCellRenderer{  

    @Override  

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,   boolean hasFocus, int row, int column) {  
        this.setText((String)value);  
        this.setWrapStyleWord(true);                      
        this.setLineWrap(true);     


        //set the JTextArea to the width of the table column  
        setSize(table.getColumnModel().getColumn(column).getWidth(),getPreferredSize().height);  
        if (table.getRowHeight(row) != getPreferredSize().height) {  
            //set the height of the table row to the calculated height of the JTextArea  
            table.setRowHeight(row, getPreferredSize().height);  
        }  
        return this;  
    }
}

提前致谢。

Answer 1

经过一番搜索，我终于得到了它，只需从另一个答案复制一些代码，并在我的示例中使用它，对于需要带有可编辑单元格的表格的任何人来说，这是最终代码。

class TextAreaCellRenderer implements TableCellRenderer {

    private JTextArea textArea = new JTextArea();

    public TextAreaCellRenderer() {
        super();
        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((value == null) ? "" : value.toString());
        return textArea;
    }
}

class TextAreaCellEditor implements TableCellEditor {

    private final JScrollPane scroll;
    private JTextArea textArea = new JTextArea();

    public TextAreaCellEditor() {
        scroll = new JScrollPane(textArea);
        scroll.setBorder(BorderFactory.createEmptyBorder());
        //scroll.setViewportBorder(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, 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((value != null) ? value.toString() : "");
        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);
            }
        }
    }
}

只需复制这两个类，然后在表中使用它，如下所示:

    'jTableName'.getColumnModel().getColumn('number of column you need to set editable').setCellRenderer(new 'principal class name'.TextAreaCellRenderer()); 
    'jTableName'.getColumnModel().getColumn('number of column you need to set editable').setCellEditor(new 'principal class name'.TextAreaCellEditor());

只需更改注释部分，就是这样，希望它能帮助像它一样帮助我的人，我使用此链接作为基础。 Custom CellEditor with JScrollPane - start editing issue