多个 JTable 相互叠加，就像一个 JTable

Question

我想要 x 个 JTables 在彼此之上，就像一个 JTable 一样。我创建了 x 个单独的 JScollPanes - 每个 table 一个，并将它们全部插入到一个 JPanel (panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));) 中。

我只显示最顶部 table 的 header。为了使它们一致地水平滚动，我使用了 here.

我还需要完成两个任务才能实现它看起来像一个大 JTable 的预期结果。

我希望只有一个垂直滚动条？如何实现？
我希望所有 table 共享同一个 TableColumnModel 作为最上面的 table（这是唯一显示 header 的）因此，如果通过拖放 header 移动列，则所有 table 都会反映更改...

如果有人想知道，我以前尝试将每个 JTable 添加到一个 JPanel，然后将每个 JPanel 添加到一个 JScrollPane。该解决方案的问题是，如果其中一个 JTable 有很多条目，垂直滚动条将不会显示所有条目....

Answer 1

基于这个问题和你其他问题的图片，我可能有一个方法，虽然它有点 hack。

方法：

创建多个 table 并将它们添加到 JScrollPane。使用 BoxLayout
第一个滚动窗格将包含并清空 table，因此只有 table header 在滚动窗格中可见。
最后一个滚动窗格将显示 JTable 和水平滚动条。
第一个和最后一个之间的任何滚动窗格将只显示 JTable。
代码使用自定义 ScrollablePanel。此面板将强制面板的宽度等于视口的宽度。这将反过来强制每个滚动窗格的水平滚动条处于活动状态。每个水平滚动条共享相同的模型，因此即使只有一个滚动条可见，所有 table 也会同时滚动。

查看 Scrollable Panel 下载代码。

这里是代码：

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableSharedHeader2 extends JPanel
{
    private JTable table1;
    private JTable table2;
    private JPanel tablePanel;

    TableSharedHeader2()
    {
        setLayout( new BorderLayout() );

        //  Only the Table Header is displayed

        JTable table0 = new JTable( 0, 10);
        table0.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
        table0.setPreferredScrollableViewportSize(table0.getPreferredSize());
        JScrollPane scrollPane0 = new JScrollPane( table0 );
        scrollPane0.setVerticalScrollBarPolicy( ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER );

        //  Only the JTable is displayed

        table1 = new JTable(5, 10);
        table1.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
        table1.setTableHeader( null );
        table1.setPreferredScrollableViewportSize(table1.getPreferredSize());
        JScrollPane scrollPane1 = new JScrollPane( table1 );
        scrollPane1.setVerticalScrollBarPolicy( ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER );

        // The JTable and the horizontal scrollbar is displayed.

        table2 = new JTable(3, 10);
        table2.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
        table2.setTableHeader( null );
        System.out.println(table0.getTableHeader());
        table2.setPreferredScrollableViewportSize(table2.getPreferredSize());
        JScrollPane scrollPane2 = new JScrollPane( table2 );
        scrollPane2.setVerticalScrollBarPolicy( ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER );
        scrollPane2.setHorizontalScrollBarPolicy( ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS );

        // share the column model with the last two tables

        table1.setColumnModel( table0.getColumnModel() );
        table2.setColumnModel( table0.getColumnModel() );

        // share the scrollbar model with the last two scrollbars

        scrollPane1.getHorizontalScrollBar().setModel( scrollPane0.getHorizontalScrollBar().getModel());
        scrollPane2.getHorizontalScrollBar().setModel( scrollPane0.getHorizontalScrollBar().getModel());

        //  hide the scrollbars of the first two tables.

        scrollPane0.getHorizontalScrollBar().setPreferredSize( new Dimension(0, 0) );
        scrollPane1.getHorizontalScrollBar().setPreferredSize( new Dimension(0, 0) );

        // add components to the panel

        tablePanel = new JPanel();
        ScrollablePanel tablePanel = new ScrollablePanel();
        tablePanel.setScrollableWidth( ScrollablePanel.ScrollableSizeHint.FIT );
        tablePanel.setLayout( new BoxLayout(tablePanel, BoxLayout.Y_AXIS) );
        tablePanel.add( scrollPane0 );
        tablePanel.add( new JLabel("First Label") );
        tablePanel.add( scrollPane1 );
        tablePanel.add( new JLabel("Second Label") );
        tablePanel.add( scrollPane2 );

        JScrollPane scrollPane = new JScrollPane( tablePanel );
        scrollPane.setHorizontalScrollBarPolicy( ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER );
        add( scrollPane );

    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("TableSharedHeader2");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TableSharedHeader2());
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

Answer 2

经过camickr的大力帮助和指导，这里是代码解决方案。

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableSharedHeader2 extends JPanel
{
    private JTable table1;
    private JTable table2;
    private JPanel tablePanel;

    TableSharedHeader2()
    {
        setLayout( new BorderLayout() );

        //  Only the Table Header is displayed

        JTable table0 = new JTable( 0, 10);
        table0.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
        table0.setPreferredScrollableViewportSize(table0.getPreferredSize());
        JScrollPane scrollPane0 = new JScrollPane( table0 );
        scrollPane0.setVerticalScrollBarPolicy( ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER );

        //  Only the JTable is displayed

        table1 = new JTable(5, 10);
        table1.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
        table1.setTableHeader( null );
        table1.setPreferredScrollableViewportSize(table1.getPreferredSize());
        JScrollPane scrollPane1 = new JScrollPane( table1 );
        scrollPane1.setVerticalScrollBarPolicy( ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER );

        // The JTable and the horizontal scrollbar is displayed.

        table2 = new JTable(60, 10);
        table2.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
        table2.setTableHeader( null );
        System.out.println(table0.getTableHeader());
        table2.setPreferredScrollableViewportSize(table2.getPreferredSize());
        JScrollPane scrollPane2 = new JScrollPane( table2 );
        scrollPane2.setVerticalScrollBarPolicy( ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER );
         scrollPane2.setHorizontalScrollBarPolicy( ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER );

        // share the column model with the last two tables

        table1.setColumnModel( table0.getColumnModel() );
        table2.setColumnModel( table0.getColumnModel() );

        // share the scrollbar model with the last two scrollbars

        scrollPane1.getHorizontalScrollBar().setModel( scrollPane0.getHorizontalScrollBar().getModel());
        scrollPane2.getHorizontalScrollBar().setModel( scrollPane0.getHorizontalScrollBar().getModel());

        //  hide the scrollbars of the first two tables.

        scrollPane0.getHorizontalScrollBar().setPreferredSize( new Dimension(0, 0) );
        scrollPane1.getHorizontalScrollBar().setPreferredSize( new Dimension(0, 0) );

        // add components to the panel

        tablePanel = new JPanel();
        ScrollablePanel tablePanel = new ScrollablePanel();
        tablePanel.setScrollableWidth( ScrollablePanel.ScrollableSizeHint.FIT );

        //changed this to stretch for Vertical Scroll Bar to appear if frame is resized and data can not fit in viewport
        tablePanel.setScrollableHeight( ScrollablePanel.ScrollableSizeHint.STRETCH );
        tablePanel.setLayout( new BoxLayout(tablePanel, BoxLayout.Y_AXIS) );

        tablePanel.add( new JLabel("First Label") );
        tablePanel.add( scrollPane1 );
        tablePanel.add( new JLabel("Second Label") );
        tablePanel.add( scrollPane2 );

        JScrollPane scrollPane = new JScrollPane( tablePanel );
        JScrollBar bar = scrollPane2.getHorizontalScrollBar();

    //this removes mouse wheel listeners from all the inner scrollpanes and
   //allows the main scrollpane (scrollPane) to react to mousewheel
        scrollPane0.removeMouseWheelListener(scrollPane0.getMouseWheelListeners()[0]);
        scrollPane1.removeMouseWheelListener(scrollPane1.getMouseWheelListeners()[0]);
        scrollPane2.removeMouseWheelListener(scrollPane2.getMouseWheelListeners()[0]);

        // Add header to top of border layout
        add(scrollPane0,BorderLayout.PAGE_START);

        //add main tablePanel which has JTables (no headers) and labels to body of border layout
        add( scrollPane,BorderLayout.CENTER );

        //add bottom scollpane (scrollpane2) scroll bar to bottom of border layout 
        add(bar,BorderLayout.PAGE_END);
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("TableSharedHeader2");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TableSharedHeader2());
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

多个 JTable 相互叠加，就像一个 JTable

Multiple JTables on top of each other acting like one JTable

java

swing

jtable

jscrollpane