将已排序的JTable的modelRowIndex转换为viewRowIndex [英] Convert modelRowIndex to viewRowIndex for sorted JTable
问题描述
我有一个可排序的JTable;添加一行后,我想知道其视图-索引.我尝试使用这样的表模型侦听器:
I have a sortable JTable; when a row is added I want to know its view-index. I tried using a table model listener like this:
@Override
public void tableChanged(TableModelEvent event)
{
if (event.getType() == TableModelEvent.INSERT)
{
int modelRowIndex = event.getFirstRow();
int viewRowIndex = table.convertRowIndexToView(modelRowIndex);
System.out.println("viewRowIndex: " + viewRowIndex);
}
}
如果表未排序,则此方法有效.不幸的是,如果对表进行排序,转换方法将导致由DefaultRowSorter.java:503
引起的ArrayIndexOutOfBoundsException
.
This works if the table is not sorted. Unfortunately, if the table is sorted the conversion-method results in an ArrayIndexOutOfBoundsException
caused by DefaultRowSorter.java:503
.
我猜这是因为表模型在通知行排序器之前先通知我的侦听器.有任何想法吗?谢谢!
I guess this happens because the table model notifies my listener before it notifies the row sorter. Any ideas? Thanks!
这是SSCCE:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
public class RowIndexSSCCE extends JFrame
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
new RowIndexSSCCE().setVisible(true);
}
});
}
private final JTable table;
public RowIndexSSCCE()
{
JButton button = new JButton("Add");
button.addActionListener(new ButtonListener());
table = new JTable(new Model());
table.setAutoCreateRowSorter(true);
table.getModel().addTableModelListener(new ModelListener());
JScrollPane scrollPane = new JScrollPane(table);
JPanel panel = new JPanel();
panel.add(button);
panel.add(scrollPane);
add(panel);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private class ButtonListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent event)
{
((Model) table.getModel()).addRow("asdf" + table.getRowCount());
}
}
private class ModelListener implements TableModelListener
{
@Override
public void tableChanged(TableModelEvent event)
{
if (event.getType() == TableModelEvent.INSERT)
{
int modelRowIndex = event.getFirstRow();
int viewRowIndex = table.convertRowIndexToView(modelRowIndex);
System.out.println("viewRowIndex: " + viewRowIndex);
}
}
}
private class Model extends AbstractTableModel
{
private final List<String> data = new ArrayList<String>();
public void addRow(String string)
{
int oldSize = data.size();
data.add(string);
fireTableRowsInserted(oldSize, oldSize);
}
@Override
public int getRowCount()
{
return data.size();
}
@Override
public int getColumnCount()
{
return 1;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex)
{
return data.get(rowIndex);
}
}
}
我自己弄清楚了...使用SwingUtilities.invokeLater
可以确保在更新行排序器之后完成行索引转换:
I just figured it out myself... using SwingUtilities.invokeLater
ensures that the row index conversion is done after the row sorter has been updated:
@Override
public void tableChanged(final TableModelEvent event)
{
if (event.getType() == TableModelEvent.INSERT)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
int modelRowIndex = event.getFirstRow();
int viewRowIndex = table.convertRowIndexToView(modelRowIndex);
System.out.println("viewRowIndex: " + viewRowIndex);
}
});
}
}
推荐答案
是的,以错误的顺序通知了表模型侦听器.我想到的最简单的解决方案是自己实现侦听器.对于我来说,我从来没有通过扩展AbstractTableModel来实现表模型.我发现自己实现该功能更加透明.
You are right, the table model listeners are informed in the wrong order. The easiest solution that comes to my mind is to implement the listeners yourself. As for me, I never implement table models by extending the AbstractTableModel. I find it more transparent to implement the functionality myself.
private class Model extends AbstractTableModel {
private final List<TableModelListener> listeners = new ArrayList<TableModelListener>();
@Override
public void addTableModelListener(TableModelListener l) {
listeners.add(l);
}
@Override
public void fireTableRowsInserted(int firstRow, int lastRow) {
for (TableModelListener l : listeners) {
l.tableChanged(new TableModelEvent(Model.this, firstRow,
lastRow, TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
}
}
...
}
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