Question

如何使用行标题创建JTable？

这个问题看似简单，我可以在Google搜索中找到很多提示。尽管如此，我发现的一切都是如何制作模拟真实标题的列的提示。虽然这很好，但它带来的问题是外观和感觉不能很好地应用。

Answer 1

试试这个。代码来自这里和那里，但它运作得相当好。

它是一个带有可重复排列的rowHeader的JTable（在标题行之间拖动鼠标以调整大小，与通常的列一样）

它要求在调整大小（运行良好）时显示重绘的图像路径

$ java JTableRowHeader /path/to/image.gif

这是代码


import javax.swing.;
import javax.swing.event.MouseInputAdapter;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import java.awt.;
import java.awt.event.MouseEvent;
import java.io.File;
import java.util.Vector;

/**
 * JTable redimensionable
 * User: alberto
 * Date: 23/01/13
 * Time: 1:04
 */
public class JTableRowHeader {

private static final String COL_IMAGE = "Image";
private static final int MIN_ROW_HEIGHT = 12;

public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    String filename = args[0];
    if (new File(filename).exists()) {
        System.out.println("Provide the path of an image");
    }
    final JTable table = new JTable(new Object[][]{
                                        {filename, filename, 5.5}
                                        , {filename, null, 7}
                                        , {"nothing", null, 12}}
            , new Object[]{"File", COL_IMAGE, "Number"});

    JScrollPane scrollPane = new JScrollPane(table);
    JPanel panel = new JPanel(new BorderLayout());
    panel.add(scrollPane, BorderLayout.CENTER);
    TableColumn column = table.getColumn(COL_IMAGE);
    column.setCellRenderer(new DefaultTableCellRenderer() {
        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            if (value != null) {
                ImageIcon image = new ImageIcon(value.toString());
                setIcon(image);
            } else {
                setIcon(null);
            }
            setHorizontalAlignment(JLabel.CENTER);
            return this;
        }
    });
    table.setRowHeight(0, 200);

    scrollPane.setRowHeaderView(buildRowHeader(table));

    frame.getContentPane().add(panel);
    frame.setPreferredSize(new Dimension(400, 400));
    frame.pack();
    frame.setVisible(true);
}

private static JList buildRowHeader(final JTable table) {
    final Vector<String> headers = new Vector<String>();
    for (int i = 0; i < table.getRowCount(); i++) {
        headers.add(String.valueOf((char) (i + 65)).toUpperCase());
    }
    ListModel lm = new AbstractListModel() {

        public int getSize() {
            return headers.size();
        }

        public Object getElementAt(int index) {
            return headers.get(index);
        }
    };

    final JList rowHeader = new JList(lm);
    rowHeader.setOpaque(false);
    rowHeader.setFixedCellWidth(50);


    MouseInputAdapter mouseAdapter = new MouseInputAdapter() {
        Cursor oldCursor;
        Cursor RESIZE_CURSOR = Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR);
        int index = -1;
        int oldY = -1;

        @Override
        public void mousePressed(MouseEvent e) {
            super.mousePressed(e);
        }

        @Override
        public void mouseMoved(MouseEvent e) {
            super.mouseMoved(e);
            int previ = getLocationToIndex(new Point(e.getX(), e.getY() - 3));
            int nexti = getLocationToIndex(new Point(e.getX(), e.getY() + 3));
            if (previ != -1 && previ != nexti) {
                if (!isResizeCursor()) {
                    oldCursor = rowHeader.getCursor();
                    rowHeader.setCursor(RESIZE_CURSOR);
                    index = previ;
                }
            } else if (isResizeCursor()) {
                rowHeader.setCursor(oldCursor);
            }
        }

        private int getLocationToIndex(Point point) {
            int i = rowHeader.locationToIndex(point);
            if (!rowHeader.getCellBounds(i, i).contains(point)) {
                i = -1;
            }
            return i;
        }

        @Override
        public void mouseReleased(MouseEvent e) {
            super.mouseReleased(e);
            if (isResizeCursor()) {
                rowHeader.setCursor(oldCursor);
                index = -1;
                oldY = -1;
            }
        }

        @Override
        public void mouseDragged(MouseEvent e) {
            super.mouseDragged(e);
            if (isResizeCursor() && index != -1) {
                int y = e.getY();
                if (oldY != -1) {
                    int inc = y - oldY;
                    int oldRowHeight = table.getRowHeight(index);
                    if (oldRowHeight > 12 || inc > 0) {
                        int rowHeight = Math.max(MIN_ROW_HEIGHT, oldRowHeight + inc);
                        table.setRowHeight(index, rowHeight);
                        if (rowHeader.getModel().getSize() > index + 1) {
                            int rowHeight1 = table.getRowHeight(index + 1) - inc;
                            rowHeight1 = Math.max(12, rowHeight1);
                            table.setRowHeight(index + 1, rowHeight1);
                        }
                    }
                }
                oldY = y;
            }
        }

        private boolean isResizeCursor() {
            return rowHeader.getCursor() == RESIZE_CURSOR;
        }
    };
    rowHeader.addMouseListener(mouseAdapter);
    rowHeader.addMouseMotionListener(mouseAdapter);
    rowHeader.addMouseWheelListener(mouseAdapter);

    rowHeader.setCellRenderer(new RowHeaderRenderer(table));
    rowHeader.setBackground(table.getBackground());
    rowHeader.setForeground(table.getForeground());
    return rowHeader;
}

static class RowHeaderRenderer extends JLabel implements ListCellRenderer {

    private JTable table;

    RowHeaderRenderer(JTable table) {
        this.table = table;
        JTableHeader header = this.table.getTableHeader();
        setOpaque(true);
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
        setHorizontalAlignment(CENTER);
        setForeground(header.getForeground());
        setBackground(header.getBackground());
        setFont(header.getFont());
        setDoubleBuffered(true);
    }

    public Component getListCellRendererComponent(JList list, Object value,
                                                  int index, boolean isSelected, boolean cellHasFocus) {
        setText((value == null) ? "" : value.toString());
        setPreferredSize(null);
        setPreferredSize(new Dimension((int) getPreferredSize().getWidth(), table.getRowHeight(index)));
        //trick to force repaint on JList (set updateLayoutStateNeeded = true) on BasicListUI
        list.firePropertyChange("cellRenderer", 0, 1);
        return this;
    }
}

}

如果您不关心图片路径，请注释。

结果如下：

Screenshot of JTableRowHeader

Answer 2

解决我的问题我只是将我的渲染器作为我的渲染器返回到行标题已经带有我想要的标题的标题。让我解释一下，我创建一个带有标题的表，获取标题并将其作为我的渲染器返回。

谢谢！ Leandro的

Answer 3

这是另一种实施方式。行列/标题已固定到位：

http://blue-walrus.com/2014/12/row-number-column-in-jtable/

JTable行标头实现

3 个答案: