Question

我有一个可编辑的JTable并设置了一个DefaultCellEditor，如下所示：

    colModel.getColumn( 1 ).setCellEditor( new DefaultCellEditor( txtEditBox ) {
        // ...
        @Override
        public void cancelCellEditing() {
            super.cancelCellEditing();
            // handling the event
        }
        // ...
    }

但是，在编辑此列中的单元格时按下escape时，虽然编辑模式已完成，但不会调用此方法。有什么想法吗？难道我做错了什么？有没有办法处理这个（除了手动添加KeyListener）？

Answer 1

官方方式：您可以注册CellEditorListener：AbstractCellEditor.addCellEditorListener（...）。如果取消编辑，则应调用editingCanceled（ChangeEvent e）。 由于SUN错误 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6788481，不会调用editCanceled :(

作为解决方法，您可以为ESCAPE键注册自己的操作并自行处理。但它不适用于调整大小事件。

另一个解决方案（快速和脏;-)）：覆盖方法JTable.removeEditor（）并在超级调用后插入代码。

Answer 2

我也有这个问题。我写了另一个涉及ActionListener和FocusListener的解决方法。就是这样：

public class TableEditorListenerHelper {

// dealing with events
private final EventListenerList listeners = new EventListenerList();
private ChangeEvent changeEvent;

// cell editor that we're helping
private CellEditor editor;

// transient state
private boolean editing = false;
private JTable table;

public TableEditorListenerHelper(CellEditor editor, JTextField field) {
    this.editor = editor;
    field.addActionListener(new ActionListener() {
        @Override public void actionPerformed(ActionEvent e) {
            fireEditingStopped();
        }
    });
    field.addFocusListener(new FocusListener() {

        @Override public void focusGained(FocusEvent e) {
            editing = true;
        }

        @Override public void focusLost(FocusEvent e) {
            JTable table = TableEditorListenerHelper.this.table;
            if (editing && isEditing(table)) {
                fireEditingCanceled();
            }
        }

        private boolean isEditing(JTable table) { // a hack necessary to deal with focuslist vs table repaint
            return table != null && table.isEditing();
        }

    });
}

public void setTable(JTable table) {
    this.table = table;
}

public void addCellEditorListener(CellEditorListener l) {
    listeners.add(CellEditorListener.class, l);
}

public void removeCellEditorListener(CellEditorListener l) {
    listeners.remove(CellEditorListener.class, l);
}

public CellEditorListener[] getCellEditorListeners() {
    return listeners.getListeners(CellEditorListener.class);
}

protected void fireEditingCanceled() {
    for (CellEditorListener l : getCellEditorListeners()) {
        l.editingCanceled(getOrCreateEvent());
    }
    resetEditingState();
}

protected void fireEditingStopped() {
    for (CellEditorListener l : getCellEditorListeners()) {
        l.editingStopped(getOrCreateEvent());
    }
    resetEditingState();
}

private void resetEditingState() {
    table = null;
    editing = false;
}

private ChangeEvent getOrCreateEvent() {
    return changeEvent = changeEvent == null ? new ChangeEvent(editor) : changeEvent;
}

Here您可以找到更完整的解决方案。

Answer 3

另一种方式修复此错误：

jTable.addPropertyChangeListener("tableCellEditor", e -> {
    Object o = e.getOldValue();
    if (o instanceof DefaultCellEditor) {
        ((DefaultCellEditor) o).cancelCellEditing();
    }
});

为什么在编辑JTable单元格时按下escape时未调用cancelCellEditing（）？

3 个答案: