java-JTable中行选择的受控编辑

我有一个JTable,显示来自SQL数据库的行.该表相对较小(仅4列,最多1000行).

我想让用户有机会编辑表中的任何单元格,但要避免过多地限制它,以便他们必须使用编辑对话框(这使错误检查和验证容易得多,但不太直观)

我尝试了几种使用JTable的valueChanged方法控制编辑选择的方法,但是运气不佳.

我希望在编辑结束时对每一行进行编辑并将其写入数据库.我希望一旦单击一个单元格以开始对该行的编辑,就无法选择其他行,直到用户完成对该行的编辑为止(其他行显示为灰色).编辑每个单元格并按Enter后,编辑选择应跳到同一行的下一列.

谁能指出我该如何实现？

//  Create table with database data
   table = new JTable(new DefaultTableModel(data, columnNames)) {
        public Class getColumnClass(int column) {
            for (int row = 0; row < getRowCount(); row++) {
                Object o = getValueAt(row, column);
                if (o != null){
                    return o.getClass();
                }
            }
            return Object.class;
        }

        @Override
        public boolean isCellEditable(int row, int col){
            return true; 
        }

        @Override
        public boolean editCellAt(int row, int column) {
            boolean ans = super.editCellAt(row, column);
            if (ans) { 
                Component editor = table.getEditorComponent();
                editor.requestFocusInWindow();
            }
            return ans;
        }

        @Override
        public void valueChanged(ListSelectionEvent source) {
            super.valueChanged(source);
            if (table!=null)
                table.changeSelection(getSelectedRow(), getSelectedColumn()+1, false, false);
        }

    };

编辑-具有表指针的自定义单元格编辑器似乎是一个开始

public class ExchangeTableCellEditor  extends AbstractCellEditor implements TableCellEditor {

private JTable table;

JComponent component = new JTextField();

public ExchangeTableCellEditor(JTable table) {
    this.table = table;
}

public boolean stopCellEditing() {
    boolean ans = super.stopCellEditing();
    //now we want to increment the cell count
    table.editCellAt(table.getSelectedRow(), table.getSelectedColumn()+1);
    return ans;
}

@Override
public void cancelCellEditing() {
    //do nothing... must accept cell changes 
}

@Override
public Object getCellEditorValue() {
    return ((JTextField)component).getText();
}

@Override
public Component getTableCellEditorComponent(JTable arg0, Object value,
        boolean arg2, int arg3, int arg4) {
    ((JTextField)component).setText((String)value);
    return component;
}

}

解决方法:

default renderer and editor通常适合大多数数据类型,但是您可以根据需要定义自定义renderers和editors.

附录：我不熟悉您的片段中显示的方法.相反,如下所示,向您的模型注册一个TableModelListener,并使用保证的粒度更新数据库.另请参见How to Use Tables: Listening for Data Changes.

附录：@kleopatra关于您的TableCellEditor是正确的.通知侦听器的一种便捷方法是调用超级实现,如here所示.请注意,委托调用fireEditingStopped().

/** @see https://stackoverflow.com/questions/9155596 */
public class NewJavaGUI extends JPanel {

    private final JTable table;

    public NewJavaGUI() {
        String[] colNames = {"C1", "C2", "C3"};
        DefaultTableModel model = new DefaultTableModel(colNames, 0) {

            @Override
            public boolean isCellEditable(int row, int col) {
                // return your actual criteria
                return true;
            }

            @Override
            public Class getColumnClass(int col) {
                // return your actual type tokens
                return getValueAt(0, col).getClass();
            }
        };
        // Add data; note auto-boxing
        model.addRow(new Object[]{"A1", "A2", 42});
        model.addRow(new Object[]{"B1", "B2", 42d});
        model.addTableModelListener(new TableModelListener() {

            @Override
            public void tableChanged(TableModelEvent e) {
                // DML as indicated
            }
        });
        table = new JTable(model);
        this.add(table);
    }

    private void display() {
        JFrame f = new JFrame("NewJavaGUI");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new NewJavaGUI().display();
            }
        });
    }
}

标签：swing,jtable,java
来源： https://codeday.me/bug/20191201/2083328.html