将JScrollPane滚动到JTable上的特定行 [英] Scroll a JScrollPane to a specific row on a JTable

问题描述

可能重复：

JTable滚动到指定的行索引

我有一个JTable，我在程序上需要使用以下代码选择一行：

I have a JTable and I programmatically need to select a row by using this code:

  myTable.setRowSelectionInterval(i, j);

（其中i和j分别是有效的行号和列号）。

(where i and j are valid row and column numbers respectively).

问题是，当你跳到一行时，JScrollPane不会移动。
在这种情况下，表格很长，并且通常在屏幕上看不到选定行，因此用户必须手动上/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。

The problem is, when you jump to a row, the JScrollPane does not move. In this case, the table is quite long, and often the "selected row" is not visible on the screen, so the user has to stay scrolling up/down manually to find it. I would like to know how I can make the JScrollPane automatically jump to the specific location of the row.

编辑：找到这一个可以做到这一点的班轮：

Found this one liner which can do it:

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

推荐答案

只需通过@ Eng.Fouad +1扩展帖子，没有像我预期的那样有效（在另一个Java Swing论坛 StanislavL 的帮助下）

just extends post by @Eng.Fouad +1, no works as I exactly expected (with kind help by StanislavL from another Java Swing forum)

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();
    }
}

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