Question

我的申请分为两个主要部分：

由JLabel和JTableHeader
包含JScrollPane

JTable

JTableHeader在单独的面板中的原因是它不应该滚动。表中的列都设置了首选/最大宽度（中间的列除外），因此当调整框架大小时，只有列应该更改其宽度。

编辑：我相信我可以使用JScrollPane.setColumnHeaderView( JTable.getTableHeader() );来获取表头保持静态 - 我得到的代码就是这样的并且改变它并不会影响手头的问题据我所知

我遇到JScrollPane违反JTableHeader的从右到左（RTL）方向的问题。 JTableHeader将在左侧对齐，而JTable将在右侧对齐。

该问题类似于发布的here，指出了这个未解决的bug。我不完全确定这是我看到的问题，因为JTableHeader不应该在滚动窗格中。此外，建议的解决方案不起作用，因为我确实需要滚动条在左侧，就像在RTL方向中所期望的那样。

如何在保持自动调整列大小的同时修复JTableHeader的方向？

编辑：在tablePanel中添加了JButton，因为它假设在那里。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.ComponentOrientation;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;

public class SwingTest {

  public static void main( String[] args ) {
    final JFrame frame = new JFrame( "RTL Test" );

    //ComponentOrientation orientation = ComponentOrientation.LEFT_TO_RIGHT;
    ComponentOrientation orientation = ComponentOrientation.RIGHT_TO_LEFT;

    frame.setComponentOrientation( orientation );

    /* Build and populate table */
    String data[][] = {
      { "1", "foo", "bar", "5000" },
      { "2", "wtf", "RTL", "20000" },
      { "3", "hello", "world", "30000" },
      { "4", "why", "align", "25000" },
      { "5", "foo", "bar", "5000" },
      { "6", "wtf", "RTL", "20000" },
      { "7", "hello", "world", "30000" },
      { "8", "why", "align", "25000" },
      { "9", "hello", "world", "30000" },
      { "10", "hello", "world", "30000" },
      { "11", "hello", "world", "30000" }
    };
    String col[] = { "First", "Second", "Third", "Fourth" };
    DefaultTableModel model = new DefaultTableModel( data, col );
    /* Simply overrides isCellEditable to always * return false */
    JTable table = new NonEditableTable( model );
    /* By using AUTO_RESIZE_OFF, the header becomes correctly aligned but columns no longer auto-resize */
    //table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
    table.setAutoResizeMode( JTable.AUTO_RESIZE_ALL_COLUMNS );
    table.applyComponentOrientation( orientation );

    /* Set all but 3rd column to have a preferred/max size */
    TableColumn tableColumn = null;
    for ( int i = 0; i < table.getColumnCount(); i++ ) {
      if ( i != 2 ) {
        tableColumn = table.getColumnModel().getColumn( i );
        tableColumn.setMaxWidth( 100 );
        tableColumn.setPreferredWidth( 100 );
      }
    }

    /* Pretty */
    JTableHeader header = table.getTableHeader();
    header.setForeground( Color.RED );

    /* ScrollPane = JScrollPane + JTable */
    JPanel tablePanel = new JPanel( new BorderLayout() );
    tablePanel.add( BorderLayout.CENTER, table );
    tablePanel.add( BorderLayout.CENTER, new JButton( "Doh!" ) );
    JScrollPane scrollPane = new JScrollPane( tablePanel );
    scrollPane.setBorder( BorderFactory.createEmptyBorder() );
    /* NOTE: This is what breaks the header when using AUTO_RESIZE_ALL_COLUMNS, comment out to see */
    scrollPane.setComponentOrientation( orientation );

    /* Header */
    JPanel headerPanel = new JPanel( new BorderLayout() );
    headerPanel.add( BorderLayout.NORTH, new JLabel( "SWING TEST" ) );
    headerPanel.add( BorderLayout.CENTER, Box.createVerticalStrut( 5 ) );
    headerPanel.add( BorderLayout.SOUTH, table.getTableHeader() );
    headerPanel.applyComponentOrientation( orientation );

    /* Main = Header + ScrollPane */
    JPanel mainPanel = new JPanel( new BorderLayout() );
    mainPanel.add( BorderLayout.NORTH, headerPanel );
    mainPanel.add( BorderLayout.CENTER, scrollPane );

    /* Add to main frame */
    frame.add( mainPanel );
    frame.setUndecorated( true );
    frame.getRootPane().setWindowDecorationStyle( JRootPane.PLAIN_DIALOG );
    frame.setSize( 500, 200 );
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

    SwingUtilities.invokeLater( new Runnable() {

      @Override
      public void run() {
        frame.setVisible( true );
      }
    } );

  }

  @SuppressWarnings( "serial" )
  public static class NonEditableTable extends JTable {

    public NonEditableTable( DefaultTableModel model ) {
      super( model );
    }

    @Override
    public boolean isCellEditable( int row, int column ) {
      return false;
    }

  }
}

Answer 1

做这样的事情怎么样？而且你会更好地控制方向。

JPanel headerPanel = new JPanel( new BorderLayout() );

JPanel headerPan = new JPanel();
JLabel xxx = new JLabel( "SWING TEST" );
xxx.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);

headerPan.add(xxx);

希望这有帮助。

JScrollPane从右到左打破方向

1 个答案: