将 JScrollPane 滚动到 JTable 上的特定行 [重复]

Posted 2023-02-26

【中文标题】将 JScrollPane 滚动到 JTable 上的特定行 [重复]

【英文标题】：Scroll a JScrollPane to a specific row on a JTable [duplicate]

【发布时间】：2011-10-26 12:40:41

【问题描述】：

可能重复：JTable Scrolling to a specified row index

我有一个 JTable，我需要使用以下代码以编程方式选择一行：

  myTable.setRowSelectionInterval(i, j);

（其中 i 和 j 分别是有效的行号和列号）。

问题是，当你跳转到一行时，JScrollPane 不会移动。 在这种情况下，表格很长，并且“选定的行”通常在屏幕上不可见，因此用户必须手动向上/向下滚动才能找到它。我想知道如何让 JScrollPane 自动跳转到该行的特定位置。

编辑：找到这个可以做到的班轮：

table.scrollRectToVisible(table.getCellRect(row,0, true)); 

【问题讨论】：

这也不能像我预期的那样工作，把它放到我发布的代码中，你必须正确移动 JViewPort

【参考方案1】：

只是扩展了@Eng.Fouad +1 的帖子，没有像我预期的那样工作（在另一个 Java Swing 论坛的StanislavL 的帮助下）

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

public class TableSelectionGood implements ListSelectionListener 

    private JTable[] tables;
    private boolean ignore = false;

    public TableSelectionGood() 
        Object[][] data1 = new Object[100][5];
        Object[][] data2 = new Object[50][5];
        Object[][] data3 = new Object[50][5];
        for (int i = 0; i < data1.length; i++) 
            data1[i][0] = "Company # " + (i + 1);
            for (int j = 1; j < data1[i].length; j++) 
                data1[i][j] = "" + (i + 1) + ", " + j;
            
        
        for (int i = 0; i < data2.length; i++) 
            data2[i][0] = "Company # " + ((i * 2) + 1);
            for (int j = 1; j < data2[i].length; j++) 
                data2[i][j] = "" + ((i * 2) + 1) + ", " + j;
            
        
        for (int i = 0; i < data3.length; i++) 
            data3[i][0] = "Company # " + (i * 2);
            for (int j = 1; j < data3[i].length; j++) 
                data3[i][j] = "" + (i * 2) + ", " + j;
            
        
        String[] headers = "Col 1", "Col 2", "Col 3", "Col 4", "Col 5";
        DefaultTableModel model1 = new DefaultTableModel(data1, headers);
        DefaultTableModel model2 = new DefaultTableModel(data2, headers);
        DefaultTableModel model3 = new DefaultTableModel(data3, headers);
        final JTable jTable1 = new JTable(model1);
        jTable1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        final JScrollPane sp1 = new JScrollPane();
        sp1.setPreferredSize(new Dimension(600, 200));
        sp1.setViewportView(jTable1);
        final JTable jTable2 = new JTable(model2);
        jTable2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        final JScrollPane sp2 = new JScrollPane();
        sp2.setPreferredSize(new Dimension(600, 200));
        sp2.setViewportView(jTable2);
        final JTable jTable3 = new JTable(model3);
        jTable3.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        final JScrollPane sp3 = new JScrollPane();
        sp3.setPreferredSize(new Dimension(600, 200));
        sp3.setViewportView(jTable3);
        TableSelectionGood tableSelection = new TableSelectionGood(jTable1, jTable2, jTable3);
        JPanel panel1 = new JPanel();
        panel1.setLayout(new GridLayout(3, 0, 10, 10));
        panel1.add(sp1);
        panel1.add(sp2);
        panel1.add(sp3);
        JFrame frame = new JFrame("tableSelection");
        frame.add(panel1);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    

    public TableSelectionGood(JTable... tables) 
        for (JTable table : tables) 
            table.getSelectionModel().addListSelectionListener(this);
        
        this.tables = tables;
    

    private JTable getTable(Object model) 
        for (JTable table : tables) 
            if (table.getSelectionModel() == model) 
                return table;
            
        
        return null;
    

    private void changeSelection(JTable table, String rowKey) 
        int col = table.convertColumnIndexToView(0);
        for (int row = table.getRowCount(); --row >= 0;) 
            if (rowKey.equals(table.getValueAt(row, col))) 
                table.changeSelection(row, col, false, false);
                return;
            
        
        table.clearSelection();
    

    @Override
    public void valueChanged(ListSelectionEvent e) 
        if (e.getValueIsAdjusting() || ignore) 
            return;
        
        ignore = true;
        try 
            JTable table = getTable(e.getSource());
            int row = table.getSelectedRow();
            String rowKey = table.getValueAt(row, table.convertColumnIndexToView(0)).toString();
            for (JTable t : tables) 
                if (t == table) 
                    continue;
                
                changeSelection(t, rowKey);
                JViewport viewport = (JViewport) t.getParent();
                Rectangle rect = t.getCellRect(t.getSelectedRow(), 0, true);
                Rectangle r2 = viewport.getVisibleRect();
                t.scrollRectToVisible(new Rectangle(rect.x, rect.y, (int) r2.getWidth(), (int) r2.getHeight()));
                System.out.println(new Rectangle(viewport.getExtentSize()).contains(rect));
            
         finally 
            ignore = false;
        
    

    public static void main(String[] args) 
        TableSelectionGood tableSelection = new TableSelectionGood();
    

【参考方案2】：

我在旧项目中使用了这个：

public static void scrollToVisible(JTable table, int rowIndex, int vColIndex)

    if (!(table.getParent() instanceof JViewport)) return;
    JViewport viewport = (JViewport)table.getParent();
    Rectangle rect = table.getCellRect(rowIndex, vColIndex, true);
    Point pt = viewport.getViewPosition();
    rect.setLocation(rect.x-pt.x, rect.y-pt.y);
    viewport.scrollRectToVisible(rect);

参考：http://www.exampledepot.com/egs/javax.swing.table/Vis.html

【讨论】：

JTable Scrolling to a specified row index 的答案的精确副本。

@Jeffrey 感谢 Jeffery 提供的链接。我过去使用过这段代码，但我忘记了从哪里得到的

使用这段代码一段时间后，我发现它对于长表有点错误。我发现了一个不错的衬里：table.scrollRectToVisible(table.getCellRect(row,0, true));