Question

我已按以下方式为表格中的两列定义了单元格编辑器：

Java代码：

JComboBox combo = new JComboBox();
//code to add items to the combo box goes here.

JTextField textField = new JTextField();
textField.setHorizontalAlignment(JTextField.RIGHT);

TableColumn column = myJTable.getColumnModel().getColumn(0);
column.setCellEditor(new DefaultCellEditor(combo));

column = myJTable.getColumnModel().getColumn(1);
column.setCellEditor(new DefaultCellEditor(textField));

我面临的问题是当焦点移动到表格单元格时，单元格不会自动编辑。因此，当焦点移动到第2列（具有文本字段作为编辑器）时，除非双击单元格或用户开始键入，否则不会显示插入符号。第1列（具有组合框作为编辑器）的情况类似，因为除非单击单元格，否则不会出现组合框。这些行为是违反直觉的，对于使用键盘操作的用户来说是不受欢迎的。:(

请建议如何解决这个问题。

提前致谢。

Answer 1

editCellAt() JTable使用DefaultCellEditor JTextField覆盖startEditing JTable。
您可以将 Space 键绑定到为table.getInputMap().put( KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), "startEditing");定义的{{1}}操作：
```
{{1}}
```

Answer 2

如上所述，您可以将JComboBox用作渲染器和编辑器。下面是一个非常基本的例子。它还显示DefaultCellEditor.setClickCountToStart()用法。

import java.awt.Component;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class ComboBoxEditorDemo {

    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("ComboBoxEditorDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTable table = new JTable(
                new Object[][] { { "1", "2" }, { "1", "2" } }, 
                new Object[] {"Col1", "Col2" });

        table.setRowHeight(24);

        TableColumn column = table.getColumnModel().getColumn(1);
        column.setCellRenderer(new MyComboBoxRenderer(new String[] { "1", "2", "3" }));
        column.setCellEditor(new MyComboBoxEditor(new String[] { "1", "2", "3" }));

        DefaultCellEditor editor = new DefaultCellEditor(new JTextField());
        editor.setClickCountToStart(1);
        column = table.getColumnModel().getColumn(0);
        column.setCellEditor(editor);

        JScrollPane scrollPane = new JScrollPane(table);
        frame.add(scrollPane);
        frame.pack();
        frame.setVisible(true);
    }

    static class MyComboBoxRenderer extends JComboBox implements
            TableCellRenderer {
        public MyComboBoxRenderer(String[] items) {
            super(items);
        }

        public Component getTableCellRendererComponent(JTable table,
                Object value, boolean isSelected, boolean hasFocus, int row,
                int column) {
            if (isSelected) {
                setForeground(table.getSelectionForeground());
                super.setBackground(table.getSelectionBackground());
            } else {
                setForeground(table.getForeground());
                setBackground(table.getBackground());
            }

            setSelectedItem(value);
            return this;
        }
    }

    static class MyComboBoxEditor extends DefaultCellEditor {
        public MyComboBoxEditor(String[] items) {
            super(new JComboBox(items));
        }
    }
}

在获得焦点的JTable中的单元格中开始编辑

2 个答案: