如何在JTable的JTableHeader中添加控件？
36
- trashgod
2
嗯...问题是什么，特别是你所说的良好行为是什么意思呢？我们都知道标题中没有对“实时”组件的支持，所有需要自己完成 :-) 至于使用切换按钮，不知道用户是否理解它的作用以及何时使用 - 不小心点击单元格将会丢失该列中的所有当前数据。 - kleopatra
@kleopatra：很好的观点；我推断首先应该质疑是否需要这样的设备。 - trashgod
3个回答
25
这篇文章 如何使用表格：使用自定义渲染器 以 TableSorter 为例，展示了如何在列标题上检测鼠标事件。在下面的示例中，使用类似的方法，SelectAllHeader extends JToggleButton 并实现了 TableCellRenderer 以达到类似的效果。当所有复选框处于统一状态时，使用 TableModelListener 条件化切换按钮。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.*;
/**
* @see https://dev59.com/Y2w05IYBdhLWcg3wnjAk
* @see http://stackoverflow.com/questions/7092219
* @see http://stackoverflow.com/questions/7093213
*/
public class SelectAllHeaderTest {
private static final int BOOLEAN_COL = 2;
private static final Object colNames[] = {"Column 1", "Column 2", ""};
private DefaultTableModel model = new DefaultTableModel(null, colNames) {
@Override
public Class<?> getColumnClass(int columnIndex) {
if (columnIndex == BOOLEAN_COL) {
return Boolean.class;
} else {
return String.class;
}
}
};
private JTable table = new JTable(model);
public void create() {
for (int x = 1; x < 6; x++) {
model.addRow(new Object[]{
"Row " + x + ", Col 1", "Row " + x + ", Col 2", false
});
}
table.setAutoCreateRowSorter(true);
table.setPreferredScrollableViewportSize(new Dimension(320, 160));
TableColumn tc = table.getColumnModel().getColumn(BOOLEAN_COL);
tc.setHeaderRenderer(new SelectAllHeader(table, BOOLEAN_COL));
JFrame f = new JFrame();
f.add(new JScrollPane(table));
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new SelectAllHeaderTest().create();
}
});
}
}
/**
* A TableCellRenderer that selects all or none of a Boolean column.
*
* @param targetColumn the Boolean column to manage
*/
class SelectAllHeader extends JToggleButton implements TableCellRenderer {
private static final String ALL = "✓ Select all";
private static final String NONE = "✓ Select none";
private JTable table;
private TableModel tableModel;
private JTableHeader header;
private TableColumnModel tcm;
private int targetColumn;
private int viewColumn;
public SelectAllHeader(JTable table, int targetColumn) {
super(ALL);
this.table = table;
this.tableModel = table.getModel();
if (tableModel.getColumnClass(targetColumn) != Boolean.class) {
throw new IllegalArgumentException("Boolean column required.");
}
this.targetColumn = targetColumn;
this.header = table.getTableHeader();
this.tcm = table.getColumnModel();
this.applyUI();
this.addItemListener(new ItemHandler());
header.addMouseListener(new MouseHandler());
tableModel.addTableModelListener(new ModelHandler());
}
@Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column) {
return this;
}
private class ItemHandler implements ItemListener {
@Override
public void itemStateChanged(ItemEvent e) {
boolean state = e.getStateChange() == ItemEvent.SELECTED;
setText((state) ? NONE : ALL);
for (int r = 0; r < table.getRowCount(); r++) {
table.setValueAt(state, r, viewColumn);
}
}
}
@Override
public void updateUI() {
super.updateUI();
applyUI();
}
private void applyUI() {
this.setFont(UIManager.getFont("TableHeader.font"));
this.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
this.setBackground(UIManager.getColor("TableHeader.background"));
this.setForeground(UIManager.getColor("TableHeader.foreground"));
}
private class MouseHandler extends MouseAdapter {
@Override
public void mouseClicked(MouseEvent e) {
viewColumn = header.columnAtPoint(e.getPoint());
int modelColumn = tcm.getColumn(viewColumn).getModelIndex();
if (modelColumn == targetColumn) {
doClick();
}
}
}
private class ModelHandler implements TableModelListener {
@Override
public void tableChanged(TableModelEvent e) {
if (needsToggle()) {
doClick();
header.repaint();
}
}
}
// Return true if this toggle needs to match the model.
private boolean needsToggle() {
boolean allTrue = true;
boolean allFalse = true;
for (int r = 0; r < tableModel.getRowCount(); r++) {
boolean b = (Boolean) tableModel.getValueAt(r, targetColumn);
allTrue &= b;
allFalse &= !b;
}
return allTrue && !isSelected() || allFalse && isSelected();
}
}
- trashgod
6
1a) 在金属上吹气
b) 不应在调整大小区域点击时进行选择/取消选择 - kleopatra
@kleopatra：这就是我想知道的事情；请考虑将其作为答案。经过进一步测试，
Metal似乎拒绝了被回收的箭头；我应该自己制作。 - trashgod如果您插入新行，触发事件fireTableRowsInserted，它将抛出itemStateChanged的无效范围错误异常，有人遇到过这种情况吗？因此，table.getRowCount()不正确，因为表格没有渲染。 - Alter Hu
@Alter.hu：
DefaultTableModel 会为您触发事件；如果您有问题，请参见 [ask]。 - trashgod@trashgod，是的，你说得对，但问题在于SelectAllHeader类将导致检查每一列数据。请看下面我更新这个类的详细注释。 - Alter Hu
@trashgod，抱歉，这是我的错，我在这里使用“AbstractTableModel”类来自定义表格模型，所以遇到了这个异常。但对于DefaultTableModel来说没问题。谢谢。 - Alter Hu
15
这个问题有两个方面（依我看来）：
可用性：发明UI交互/元素容易使用户感到困惑。以下是没有特定顺序的问题：
- 列标题的目的是描述列的内容，在用动作描述替换它时，该内容描述会丢失
- 对于我这种地球上最愚蠢的用户来说，不立即清楚头部单元格具有切换按钮的功能。意外点击它将丢失该列中先前的所有内容状态
因此，即使交互分析得出了我们确实需要/想要它，也应该：
- 仅在内容之外执行操作
- 使用更清晰的小部件（例如三态复选框——全部选择/取消选择、混合内容）。同时，必须可以从混合内容进行选择和取消选择。再想一想，复选框可能也不是最佳选择，未进一步调查。
- 尽量减少意外（仅对我而言 :-)）改变整个状态的可能性（例如通过清晰的视觉分离活动区域——复选框图标——与“正常标题”区域分开）。
技术方面
- TableHeader并不适用于“实时”组件。无论想要什么，都必须由我们自己控制
- 有例子可供参考（例如JIDE网格支持添加组件）
- 在不轻易改变呈现器的情况下保持外观和感觉始终如一，调整标题会让它看起来不太吸引人
- kleopatra
13
使用自定义的TableCellRenderer：
// column 1
col = table.getColumnModel().getColumn(1);
col.setHeaderRenderer(new EditableHeaderRenderer( new JButton("Button")));
// column 2
col = table.getColumnModel().getColumn(2);
col.setHeaderRenderer(new EditableHeaderRenderer( new JToggleButton("Toggle")));
// column 3
col = table.getColumnModel().getColumn(3);
col.setHeaderRenderer(new EditableHeaderRenderer( new JCheckBox("CheckBox")));
class EditableHeaderRenderer implements TableCellRenderer {
private JTable table = null;
private MouseEventReposter reporter = null;
private JComponent editor;
EditableHeaderRenderer(JComponent editor) {
this.editor = editor;
this.editor.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
if (table != null && this.table != table) {
this.table = table;
final JTableHeader header = table.getTableHeader();
if (header != null) {
this.editor.setForeground(header.getForeground());
this.editor.setBackground(header.getBackground());
this.editor.setFont(header.getFont());
reporter = new MouseEventReposter(header, col, this.editor);
header.addMouseListener(reporter);
}
}
if (reporter != null) reporter.setColumn(col);
return this.editor;
}
static public class MouseEventReposter extends MouseAdapter {
private Component dispatchComponent;
private JTableHeader header;
private int column = -1;
private Component editor;
public MouseEventReposter(JTableHeader header, int column, Component editor) {
this.header = header;
this.column = column;
this.editor = editor;
}
public void setColumn(int column) {
this.column = column;
}
private void setDispatchComponent(MouseEvent e) {
int col = header.getTable().columnAtPoint(e.getPoint());
if (col != column || col == -1) return;
Point p = e.getPoint();
Point p2 = SwingUtilities.convertPoint(header, p, editor);
dispatchComponent = SwingUtilities.getDeepestComponentAt(editor, p2.x, p2.y);
}
private boolean repostEvent(MouseEvent e) {
if (dispatchComponent == null) {
return false;
}
MouseEvent e2 = SwingUtilities.convertMouseEvent(header, e, dispatchComponent);
dispatchComponent.dispatchEvent(e2);
return true;
}
@Override
public void mousePressed(MouseEvent e) {
if (header.getResizingColumn() == null) {
Point p = e.getPoint();
int col = header.getTable().columnAtPoint(p);
if (col != column || col == -1) return;
int index = header.getColumnModel().getColumnIndexAtX(p.x);
if (index == -1) return;
editor.setBounds(header.getHeaderRect(index));
header.add(editor);
editor.validate();
setDispatchComponent(e);
repostEvent(e);
}
}
@Override
public void mouseReleased(MouseEvent e) {
repostEvent(e);
dispatchComponent = null;
header.remove(editor);
}
}
}
class MenuButtonTableHeaderRenderer extends JPanel implements TableCellRenderer {
private int column = -1;
private JTable table = null;
private MenuButton b;
MenuButtonTableHeaderRenderer(String name, JPopupMenu menu) {
super(new BorderLayout());
b = new MenuButton(ResourceManager.ARROW_BOTTOM, menu);
b.setBorder(BorderFactory.createEmptyBorder(1,1,1,1));
JLabel l = new JLabel(name);
l.setFont(l.getFont().deriveFont(Font.PLAIN));
l.setBorder(BorderFactory.createEmptyBorder(1,5,1,1));
add(b, BorderLayout.WEST);
add(l, BorderLayout.CENTER);
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
if (table != null && this.table != table) {
this.table = table;
final JTableHeader header = table.getTableHeader();
if (header != null) {
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
header.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
int col = header.getTable().columnAtPoint(e.getPoint());
if (col != column || col == -1) return;
int index = header.getColumnModel().getColumnIndexAtX(e.getPoint().x);
if (index == -1) return;
setBounds(header.getHeaderRect(index));
header.add(MenuButtonTableHeaderRenderer.this);
validate();
b.doClick();
header.remove(MenuButtonTableHeaderRenderer.this);
header.repaint();
}
});
}
}
column = col;
return this;
}
}
- luca
3
在哪里可以监听上面的JButton和JToggleButton的动作？作为第二个问题，为什么在鼠标释放后移除编辑器？这会导致在单击事件后编辑器消失。 - The_Cute_Hedgehog
这个 "ResourceManager.ARROW_BOTTOM" 的东西出错了，我该如何找到 ResourceManager 类？在哪个 jar 包里？@luca - JAVA
那是我用于图标的自定义类。您可以传递自己的图标。 - luca
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