Swing/HeaderTooltips のバックアップの現在との差分(No.6)

JTableHeaderのTooltipsを列ごとに変更

#screenshot

サンプルコード

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JTableHeader header = new JTableHeader(table.getColumnModel()) {
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  public String getToolTipText(MouseEvent e) {
    int c = columnAtPoint(e.getPoint());
    return getTable().getColumnName(c)
      +"################################";
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* サンプルコード [#sourcecode]
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#code(link){{
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JTable table = new JTable(model);
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table.setTableHeader(new JTableHeader(table.getColumnModel()) {
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  @Override public String getToolTipText(MouseEvent e) {
    int i = columnAtPoint(e.getPoint());
    TableColumn c = getColumnModel().getColumn(i);
    return String.format("%s (width=%dpx)", c.getHeaderValue(), c.getWidth());
  }
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};
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table.setTableHeader(header);
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});
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• JTableHeader#getToolTipText(MouseEvent)メソッドをオーバーライドしてマウスカーソルの下にあるカラムヘッダを取得
  • その名前とその幅をTooltipsTextとして使用

• 文字列がクリップされている場合だけ、ToolTipを表示する -- terai 2009-10-07 (水) 01:00:19

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  //HeaderToolTips.java
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  #spandel
  import java.awt.*;
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  import java.awt.event.*;
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  import javax.swing.*;
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  import javax.swing.table.*;
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  public class HeaderToolTips {
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    public JComponent makeUI() {
      String[] columnNames = {"StringStringStringString", "Integer", "Boolean"};
      Object[][] data = {
        {"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", 12, true},
        {"CCC", 92, true}, {"DDD", 0, false}
      };
      DefaultTableModel model = new DefaultTableModel(data, columnNames) {
        @Override public Class<?> getColumnClass(int column) {
          return getValueAt(0, column).getClass();
        }
      };
      JTable table  = new JTable(model);
      table.setAutoCreateRowSorter(true);
      JTableHeader h = table.getTableHeader();
      h.setDefaultRenderer(new HeaderRenderer(h.getDefaultRenderer()));
      JPanel p = new JPanel(new BorderLayout());
      p.add(new JScrollPane(table));
      p.setPreferredSize(new Dimension(320, 240));
      return p;
    }
    static class HeaderRenderer implements TableCellRenderer {
      private final TableCellRenderer renderer;
      private final Icon icon = UIManager.getIcon("Table.ascendingSortIcon");
      public HeaderRenderer(TableCellRenderer renderer) {
        this.renderer  = renderer;
      }
      public Component getTableCellRendererComponent(JTable table,Object value,
                 boolean isSelected, boolean hasFocus, int row, int column) {
        JLabel l = (JLabel)renderer.getTableCellRendererComponent(
          table, value, isSelected, hasFocus, row, column);
        Insets i = l.getInsets();
        Rectangle rect = table.getCellRect(row, column, false);
        rect.width -= i.left + i.right;
        RowSorter<? extends TableModel> sorter = table.getRowSorter();
        if(sorter!=null && sorter.getSortKeys().size()>0
                        && sorter.getSortKeys().get(0).getColumn()==column) {
          rect.width -= icon.getIconWidth() + 2; //XXX
        }
        FontMetrics fm = l.getFontMetrics(l.getFont());
        String str = value.toString();
        int cellTextWidth = fm.stringWidth(str);
        l.setToolTipText(cellTextWidth>rect.width?str:null);
        return l;
      }
    }
    public static void main(String[] args) {
      EventQueue.invokeLater(new Runnable() {
        public void run() { createAndShowGUI(); }
      });
    }
    public static void createAndShowGUI() {
      JFrame f = new JFrame();
      f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      f.getContentPane().add(new HeaderToolTips().makeUI());
      f.pack();
      f.setLocationRelativeTo(null);
      f.setVisible(true);
    }
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  }
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参考リンク