我想在JTable中显示一个JButton。这没什么特别的，我发现了很多这样做的例子。但是，我总是遇到通过键盘按下按钮（而不是通过鼠标）的问题。我希望我可以通过按SPACE（没有助记符）来选择一个单元格并按下（也可以在视觉上）按钮。
除了支持键之外，两个片段的工作方式就像魅力一样：
http://tips4java.wordpress.com/2009/07/12/table-button-column/
作者声称密钥有效。我相信他们做到了，但不是我检查过的所有系统。但是，支持的助记符可以很好地工作。
（张贴于此处：Adding Jbutton to JTable）
http://www.java2s.com/Code/Java/Swing-Components/ButtonTableExample.htm
（张贴于此处：Adding Jbutton to JTable）
在这个例子中，它完美无缺！但是，它对我的桌子不起作用。只需禁用行选择（我必须使用单元格选择），然后通过键按下按钮不再起作用：
table.setRowSelectionAllowed(false);
我努力弄清楚出了什么问题或如何解决它，但我失败了。我唯一的成就是调用按钮后面的动作，但没有按下按钮（我的意思是视觉行为）。
添加了一些信息：
我用过......（在许多组合中）
0％成功！
TableTest.java
import java.awt.event.ActionEvent;
import java.util.LinkedList;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TableTest extends JFrame {
public TableTest() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTable table = new JTable(new TestModel());
table.setRowSelectionAllowed(false);
table.getColumnModel().getColumn(1).setPreferredWidth(3);
table.getColumnModel().getColumn(2).setPreferredWidth(3);
this.add(new JScrollPane(table));
Action increase = new AbstractAction("+") {
@Override
public void actionPerformed(ActionEvent e) {
JTable table = (JTable) e.getSource();
int row = Integer.valueOf(e.getActionCommand());
TestModel model = (TestModel) table.getModel();
model.increment(row, 0);
}
};
ButtonColumn inc = new ButtonColumn(table, increase, 1);
Action decrease = new AbstractAction("-") {
@Override
public void actionPerformed(ActionEvent e) {
JTable table = (JTable) e.getSource();
int row = Integer.valueOf(e.getActionCommand());
TestModel model = (TestModel) table.getModel();
model.decrement(row, 0);
}
};
ButtonColumn dec = new ButtonColumn(table, decrease, 2);
pack();
}
public static void main(String[] args) {
new TableTest().setVisible(true);
}
}
class TestModel extends AbstractTableModel {
List<TestRecord> records = new LinkedList<TestRecord>();
private static class TestRecord {
private int val = 0;
}
public void increment(int row, int col) {
records.get(row).val++;
fireTableCellUpdated(row, 0);
}
public void decrement(int row, int col) {
records.get(row).val--;
fireTableCellUpdated(row, 0);
}
public TestModel() {
records.add(new TestRecord());
records.add(new TestRecord());
}
@Override
public Class<?> getColumnClass(int col) {
if (col == 0) {
return Integer.class;
} else {
return ButtonColumn.class;
}
}
@Override
public boolean isCellEditable(int row, int col) {
return true;
}
@Override
public int getColumnCount() {
return 3;
}
@Override
public int getRowCount() {
return records.size();
}
@Override
public Object getValueAt(int row, int col) {
if (col == 0) {
return records.get(row).val;
} else if (col == 1) {
return "+";
} else {
return "-";
}
}
}
ButtonColumn.java
import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.AbstractCellEditor;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;
/**
* The ButtonColumn class provides a renderer and an editor that looks like a
* JButton. The renderer and editor will then be used for a specified column in
* the table. The TableModel will contain the String to be displayed on the
* button.
*
* The button can be invoked by a mouse click or by pressing the space bar when
* the cell has focus. Optionally a mnemonic can be set to invoke the button.
* When the button is invoked the provided Action is invoked. The source of the
* Action will be the table. The action command will contain the model row
* number of the button that was clicked.
*
*/
public class ButtonColumn extends AbstractCellEditor implements
TableCellRenderer, TableCellEditor, ActionListener, MouseListener {
private JTable table;
private Action action;
private int mnemonic;
private Border originalBorder;
private Border focusBorder;
private JButton renderButton;
private JButton editButton;
private Object editorValue;
private boolean isButtonColumnEditor;
/**
* Create the ButtonColumn to be used as a renderer and editor. The renderer
* and editor will automatically be installed on the TableColumn of the
* specified column.
*
* @param table
* the table containing the button renderer/editor
* @param action
* the Action to be invoked when the button is invoked
* @param column
* the column to which the button renderer/editor is added
*/
public ButtonColumn(JTable table, Action action, int column) {
this.table = table;
this.action = action;
renderButton = new JButton();
editButton = new JButton();
editButton.setFocusPainted(false);
editButton.addActionListener(this);
originalBorder = editButton.getBorder();
setFocusBorder(new LineBorder(Color.BLUE));
TableColumnModel columnModel = table.getColumnModel();
columnModel.getColumn(column).setCellRenderer(this);
columnModel.getColumn(column).setCellEditor(this);
table.addMouseListener(this);
}
/**
* Get foreground color of the button when the cell has focus
*
* @return the foreground color
*/
public Border getFocusBorder() {
return focusBorder;
}
/**
* The foreground color of the button when the cell has focus
*
* @param focusBorder
* the foreground color
*/
public void setFocusBorder(Border focusBorder) {
this.focusBorder = focusBorder;
editButton.setBorder(focusBorder);
}
public int getMnemonic() {
return mnemonic;
}
/**
* The mnemonic to activate the button when the cell has focus
*
* @param mnemonic
* the mnemonic
*/
public void setMnemonic(int mnemonic) {
this.mnemonic = mnemonic;
renderButton.setMnemonic(mnemonic);
editButton.setMnemonic(mnemonic);
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
if (value == null) {
editButton.setText("");
editButton.setIcon(null);
} else if (value instanceof Icon) {
editButton.setText("");
editButton.setIcon((Icon) value);
} else {
editButton.setText(value.toString());
editButton.setIcon(null);
}
this.editorValue = value;
return editButton;
}
@Override
public Object getCellEditorValue() {
return editorValue;
}
//
// Implement TableCellRenderer interface
//
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (isSelected) {
renderButton.setForeground(table.getSelectionForeground());
renderButton.setBackground(table.getSelectionBackground());
} else {
renderButton.setForeground(table.getForeground());
renderButton.setBackground(UIManager.getColor("Button.background"));
}
if (hasFocus) {
renderButton.setBorder(focusBorder);
} else {
renderButton.setBorder(originalBorder);
}
// renderButton.setText( (value == null) ? "" : value.toString() );
if (value == null) {
renderButton.setText("");
renderButton.setIcon(null);
} else if (value instanceof Icon) {
renderButton.setText("");
renderButton.setIcon((Icon) value);
} else {
renderButton.setText(value.toString());
renderButton.setIcon(null);
}
return renderButton;
}
//
// Implement ActionListener interface
//
/*
* The button has been pressed. Stop editing and invoke the custom Action
*/
@Override
public void actionPerformed(ActionEvent e) {
int row = table.convertRowIndexToModel(table.getEditingRow());
fireEditingStopped();
// Invoke the Action
ActionEvent event = new ActionEvent(table,
ActionEvent.ACTION_PERFORMED, "" + row);
action.actionPerformed(event);
}
//
// Implement MouseListener interface
//
/*
* When the mouse is pressed the editor is invoked. If you then then drag
* the mouse to another cell before releasing it, the editor is still
* active. Make sure editing is stopped when the mouse is released.
*/
@Override
public void mousePressed(MouseEvent e) {
if (table.isEditing() && table.getCellEditor() == this)
isButtonColumnEditor = true;
}
@Override
public void mouseReleased(MouseEvent e) {
if (isButtonColumnEditor && table.isEditing())
table.getCellEditor().stopCellEditing();
isButtonColumnEditor = false;
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
}
答案 0 :(得分：2)
使用TableTest和ButtonColumn的TablePopupEditor都是在选定的按钮单元格中按下 Space 键时可正常工作的完整示例。两者都没有表明独立按钮的典型ButtonModel - 定义外观，但您可以根据需要提供自己的可视队列。相关的example使用彩色边框。
答案 1 :(得分：2)
问题不在于编辑。 SPACE键击也不会转发到第一列中的默认编辑器。
问题是JTable为SPACE键定义了一个Action，因此在它有机会传递给编辑器之前就被拦截了。在我的博客中搜索Key Bindings条目，您将在其中找到列出JTable的所有默认密钥绑定的程序。被调用的Action被称为“addToSelection”，所以我不确定为什么它的工作方式会有所不同，具体取决于行的选择。
无论如何，一个解决方案是删除此操作：
InputMap im = table.getInputMap(JTable.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
KeyStroke space = KeyStroke.getKeyStroke("SPACE");
im.put(space, "none");