JXTable：对特定单元格而不是整列使用TableCellEditor和TableCellRenderer [英] JXTable: use a TableCellEditor and TableCellRenderer for a specific cell instead of the whole column
问题描述
我有一个 JXTable 6列的复合词，其中两列是 JCheckBox 。我希望有以下行为：
I have a JXTable compound of 6 columns and two of them are JCheckBox. I would like to have the following behavior:
- 如果选中第一个复选框，则启用第二个复选框，可以检查或不检查。
- 如果第一个复选框未选中，则必须禁用第二个复选框并取消选中。
I使用Photoshop编辑图像以显示所需结果：
I edited an image with Photoshop to show the desired result:
对于 CheckOne 和 CheckTwo 列，我使用自定义 TableCellEditor 和 TableCellRenderer ：
For the CheckOne and CheckTwo columns i use a custom TableCellEditor and TableCellRenderer :
public class CheckBoxCellEditor extends AbstractCellEditor implements TableCellEditor {
private static final long serialVersionUID = 1L;
private JCheckBox checkBox = new JCheckBox();
public CheckBoxCellEditor() {
checkBox.setHorizontalAlignment(SwingConstants.CENTER);
}
@Override
public Component getTableCellEditorComponent(JTable table,
Object value, boolean isSelected, int row, int column) {
checkBox.setSelected(value==null ? false : (boolean)value);
return checkBox;
}
@Override
public Object getCellEditorValue() {
return checkBox.isSelected();
}
}
public class CheckBoxCellRenderer extends JCheckBox implements TableCellRenderer{
private static final long serialVersionUID = 1L;
public CheckBoxCellRenderer() {
setHorizontalAlignment(SwingConstants.CENTER);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
setSelected(value==null ? false : (boolean)value);
return this;
}
}
这就是我设置它们的方式：
And this is how i set them:
//CheckOne
table.getColumn(4).setCellEditor(new CheckBoxCellEditor());
table.getColumn(4).setCellRenderer(new CheckBoxCellRenderer());
//CheckTwo
table.getColumn(5).setCellEditor(new CheckBoxCellEditor());
table.getColumn(5).setCellRenderer(new CheckBoxCellRenderer());
我试图将 PropertyChangeListener 添加到 JXTable 并从那里实现行为，但我无法完成它。
I tried to add a PropertyChangeListener to the JXTable and implement the behavior from there, but i couldn´t get it done.
然后我意识到我的自定义编辑器和渲染器同时更改了所有列组件，而不仅仅是所需的组件。
所以，我试图在 TableCellEditor 和 TableCellRenderer 中进行更改，并在<$ c中进行更改$ c> PropertyChangeListener 但是，再次，我无法弄明白。
Then i realised that my custom editor and renderer were changing all the column components at the same time instead of only the desired component.
So, i tried to make the changes in the TableCellEditor and TableCellRenderer, and in the PropertyChangeListener but, again, i couldn´t figure it out.
推荐答案
首先关闭请注意您的问题与JXTable无关，但与渲染器/编辑器/模型无关。
First off please note your problem is not related to JXTable but renderers / editors / model.
正如@mKorbel指出JCheckBox是布尔值的默认渲染器/编辑器，一般来说你赢了不需要重新发明轮子：只需覆盖 getColumnClass（）正确返回第5列和第6列的布尔值。
As @mKorbel points out JCheckBox is the default Renderer/Editor for booleans and generally speaking you won't need to re-invent the wheel: just override getColumnClass() properly to return Boolean on both 5th and 6th columns.
但是，由于此要求：
如果第一个复选框未选中，则第二个复选框必须禁用且未选中。
If the first checkbox is unchecked, the second must be disabled and unchecked.
这不是默认渲染器的行为，所以你实际上需要你自己的渲染器。 但只有渲染器，你不需要编辑器：因为@mKorbel指出你需要对表模型进行一些工作。
This is not the default renderer's behavior so you actually need your own renderer. But only renderer, you don't need an editor: as @mKorbel points out you need a little work with the table model.
class CheckBoxCellRenderer implements TableCellRenderer {
private final JCheckBox renderer;
public CheckBoxCellRenderer() {
renderer = new JCheckBox();
renderer.setHorizontalAlignment(SwingConstants.CENTER);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Color bg = isSelected
? table.getSelectionBackground() : table.getBackground();
renderer.setBackground(bg);
renderer.setEnabled(table.isCellEditable(row, column));
renderer.setSelected(value != null && (Boolean)value);
return renderer;
}
}
型号
您需要同时处理 isCellEditable（）和 setValueAt（）方法根据第一个布尔值正确更新您的第二个布尔值列。例如，请考虑以下代码段：
Model
You need to work on both isCellEditable() and setValueAt() methods to properly update your second booleans column based on values on first one. For instance consider this snippet:
// A default model with 5 rows and 6 columns
DefaultTableModel model = new DefaultTableModel(5, 6) {
@Override
public Class<?> getColumnClass(int columnIndex) {
switch(columnIndex) {
case 4:
case 5: return Boolean.class; // Both 5th and 6th columns are booleans
}
return super.getColumnClass(columnIndex);
}
@Override
public boolean isCellEditable(int row, int column) {
/*
* In order to know if 6th column is editable, you have to check
* 5th column's value.
*/
if(column == 5) {
Object value = getValueAt(row, 4);
return value != null && (Boolean)value;
}
return super.isCellEditable(row, column);
}
@Override
public void setValueAt(Object aValue, int row, int column) {
/*
* If 5th column value is updated to FALSE, you need to
* set 6th column's value to FALSE as well
*/
if(column == 4) {
super.setValueAt(Boolean.FALSE, row, 5);
}
super.setValueAt(aValue, row, column);
}
};
测试
这是一个完整的测试用例。希望它有所帮助。
Test it
Here is a complete test case. Hope it helps.
import java.awt.Color;
import java.awt.Component;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
/**
* @author dic19
*/
public class Demo {
private void createAndShowGui() {
DefaultTableModel model = new DefaultTableModel(5, 6) {
@Override
public Class<?> getColumnClass(int columnIndex) {
switch(columnIndex) {
case 4:
case 5: return Boolean.class;
}
return super.getColumnClass(columnIndex);
}
@Override
public boolean isCellEditable(int row, int column) {
if(column == 5) {
Object value = getValueAt(row, 4);
return value != null && (Boolean)value;
}
return super.isCellEditable(row, column);
}
@Override
public void setValueAt(Object aValue, int row, int column) {
if(column == 4) {
super.setValueAt(false, row, 5);
}
super.setValueAt(aValue, row, column);
}
};
JTable table = new JTable(model);
table.getDefaultRenderer(null);
table.getColumnModel().getColumn(5).setCellRenderer(new CheckBoxCellRenderer());
JScrollPane scrollPane = new JScrollPane(table);
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(scrollPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
class CheckBoxCellRenderer implements TableCellRenderer {
private final JCheckBox renderer;
public CheckBoxCellRenderer() {
renderer = new JCheckBox();
renderer.setHorizontalAlignment(SwingConstants.CENTER);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Color bg = isSelected
? table.getSelectionBackground() : table.getBackground();
renderer.setBackground(bg);
renderer.setEnabled(table.isCellEditable(row, column));
renderer.setSelected(value != null && (Boolean)value);
return renderer;
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Demo().createAndShowGui();
}
});
}
}
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