java - JTable 更改选择而不闪烁 ui

Question

我想更改 JTable 中的选择。典型的方法是按照建议清除并重新选择here :

ListSelectionModel model = table.getSelectionModel();
model.clearSelection();
model.addSelectionInterval(1, 1);
model.addSelectionInterval(18, 18);

遗憾的是，clearSelection 会立即更新 UI。因此，如果您单步执行此代码，选择将消失，然后又返回，这可能会导致闪烁。

我试图通过忽略更改来阻止 UI 更新。但是，以下方法不起作用:

model.setValueIsAdjusting( true );
model.clearSelection();
model.setValueIsAdjusting( false );

UI 中似乎忽略了该标志。在clearSelection之前和之后分别删除和重新添加ListSelectionListeners也不起作用。用户界面仍在更新，并且可能会闪烁。

是否有更好的方法来更改具有多行的 JTable 的完整选择，可能不是连续选择？

对我来说这不是一个主要问题，因为你确实需要寻找闪烁。尽管如此，这并不是最优的。

Answer 1

仅当您不在事件调度线程 (EDT) 上时才会出现此问题。感谢 Sascha 的提示。

示例:

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;

public class JTableExample extends JFrame
{
    private static final long serialVersionUID = 1L;

    private final JTable table;

    public JTableExample()
    {
        // headers and data for the table
        final String[] columns = new String[]{"Id", "Name"};
        final Object[][] data = new Object[][]{{1, "Alice"}, {2, "Bob"}, {3, "Charlie"},};

        // create table with data
        table = new JTable( data, columns );
        this.add( new JScrollPane( table ) );

        // Add key listener to trigger re-selection of columns
        table.addKeyListener( new KeyAdapter()
        {
            @Override
            public void keyReleased( final KeyEvent e )
            {
                // Re-select on event dispatch thread (EDT)
                if( e.getKeyCode() == KeyEvent.VK_1 )
                {
                    reselectTable();
                }

                // Re-select on a thread that is not the EDT
                if( e.getKeyCode() == KeyEvent.VK_2 )
                {
                    new Thread( () -> reselectTable() ).start();
                }

                // Re-select on a thread that is not the EDT, but using invokeLater to get back to the EDT
                if( e.getKeyCode() == KeyEvent.VK_3 )
                {
                    new Thread( () -> SwingUtilities.invokeLater( () -> reselectTable() ) ).start();
                }
            }
        } );

        // Setup JFrame
        setTitle( "JTable Example" );
        setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        pack();
        setVisible( true );
    }

    public static void main( final String[] args )
    {
        SwingUtilities.invokeLater( new Runnable()
        {
            @Override
            public void run()
            {
                new JTableExample();
            }
        } );
    }

    private void reselectTable()
    {
        System.out.println( "isEventDispatchThread:" + SwingUtilities.isEventDispatchThread() );

        final ListSelectionModel selectionModel = table.getSelectionModel();
        selectionModel.clearSelection();
        // PUT BREAKPOINT HERE
        // Selection in rendered GUI is gone here when not in the EDT
        selectionModel.addSelectionInterval( 0, 0 );
        selectionModel.addSelectionInterval( 2, 2 );
    }
}