[英]Start editing in a cell in JTable on gaining focus
我已按以下方式为表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。
此示例使用JTextField
覆盖具有DefaultCellEditor
的JTable
中的editCellAt()
。
您可以将Space键绑定到为JTable
定义的startEditing
操作:
table.getInputMap().put( KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), "startEditing");
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));
}
}
}
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