Java Swing Tips

2009/02/27

HyperLink in JTable Cell

Code

class UriRenderer extends DefaultTableCellRenderer implements MouseListener, MouseMotionListener {
  private int viewRowIndex = -1;
  private int viewColumnIndex = -1;
  private boolean isRollover;

  @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    Component c = super.getTableCellRendererComponent(
        table, value, isSelected, false, row, column);
    if (c instanceof JLabel) {
      JLabel l = (JLabel) c;
      // @see https://ateraimemo.com/Swing/ClippedHtmlLabel.html
      // String str = SwingUtilities.layoutCompoundLabel(...);
      String str = Objects.toString(value, "");
      if (isRolloverCell(table, row, column)) {
        l.setText("<html><u><font color='blue'>" + str);
      } else if (hasFocus) {
        l.setText("<html><font color='blue'>" + str);
      } else {
        l.setText(str);
      }
    }
    return c;
  }

  protected boolean isRolloverCell(JTable table, int row, int column) {
    return !table.isEditing() && viewRowIndex == row && viewColumnIndex == column && isRollover;
  }

  private static boolean isUriColumn(JTable table, int column) {
    return column >= 0 && table.getColumnClass(column).equals(URI.class);
  }

  @Override public void mouseMoved(MouseEvent e) {
    JTable table = (JTable) e.getComponent();
    Point pt = e.getPoint();
    int prevRow = viewRowIndex;
    int prevCol = viewColumnIndex;
    viewRowIndex = table.rowAtPoint(pt);
    viewColumnIndex = table.columnAtPoint(pt);
    boolean isSameCell = viewRowIndex == prevRow && viewColumnIndex == prevCol;

    boolean prevRollover = isRollover;
    isRollover = isUriColumn(table, viewColumnIndex);
    boolean isNotRollover = isRollover == prevRollover && !isRollover; // && !prevRollover;

    if (isSameCell && isNotRollover) {
      return;
    }

    // >>>> HyperlinkCellRenderer.java
    // @see https://github.com/sjas/swingset3/blob/master/trunk/SwingSet3/src/com/sun/swingset3/demos/table/HyperlinkCellRenderer.java
    Rectangle repaintRect;
    if (isRollover) {
      Rectangle r = table.getCellRect(viewRowIndex, viewColumnIndex, false);
      repaintRect = prevRollover ? r.union(table.getCellRect(prevRow, prevCol, false)) : r;
    } else { // if (prevRollover) {
      repaintRect = table.getCellRect(prevRow, prevCol, false);
    }
    table.repaint(repaintRect);
    // <<<<
    // table.repaint();
  }

  @Override public void mouseExited(MouseEvent e) {
    JTable table = (JTable) e.getComponent();
    if (isUriColumn(table, viewColumnIndex)) {
      table.repaint(table.getCellRect(viewRowIndex, viewColumnIndex, false));
      viewRowIndex = -1;
      viewColumnIndex = -1;
      isRollover = false;
    }
  }

  @Override public void mouseClicked(MouseEvent e) {
    JTable table = (JTable) e.getComponent();
    Point pt = e.getPoint();
    int col = table.columnAtPoint(pt);
    if (isUriColumn(table, col)) {
      int crow = table.rowAtPoint(pt);
      URI uri = (URI) table.getValueAt(crow, col);
      try {
        if (Desktop.isDesktopSupported()) {
          Desktop.getDesktop().browse(uri);
        }
      } catch (IOException ex) {
        // Logger.getGlobal().severe(ex::getMessage);
        UIManager.getLookAndFeel().provideErrorFeedback(e.getComponent());
      }
    }
  }

  @Override public void mouseDragged(MouseEvent e) {
    /* not needed */
  }

  @Override public void mouseEntered(MouseEvent e) {
    /* not needed */
  }

  @Override public void mousePressed(MouseEvent e) {
    /* not needed */
  }

  @Override public void mouseReleased(MouseEvent e) {
    /* not needed */
  }
}

References

2009/02/26

Use JScrollBar as JSlider

Code

int step = 5;
int extent = 20;
int min = 0;
int max = extent * 10; // 200
int value = 50;
JScrollBar scrollbar = new JScrollBar(
  JScrollBar.HORIZONTAL, value, extent, min, max + extent);
scrollbar.setUnitIncrement(step);
scrollbar.getModel().addChangeListener(new ChangeListener() {
  @Override public void stateChanged(ChangeEvent e) {
    BoundedRangeModel m = (BoundedRangeModel) e.getSource();
    spinner.setValue(m.getValue());
  }
});
JSpinner spinner = new JSpinner(new SpinnerNumberModel(value, min, max, step));

References

2009/02/16

JTableHeader CheckBox

Code

enum Status { SELECTED, DESELECTED, INDETERMINATE }

class HeaderRenderer extends JCheckBox implements TableCellRenderer {
  private final JLabel label = new JLabel("Check All");
  private final int targetColumnIndex;

  public HeaderRenderer(JTableHeader header, int index) {
    super((String) null);
    this.targetColumnIndex = index;
    setOpaque(false);
    setFont(header.getFont());
    header.addMouseListener(new MouseAdapter() {
      @Override public void mouseClicked(MouseEvent e) {
        JTableHeader header = (JTableHeader) e.getComponent();
        JTable table = header.getTable();
        TableColumnModel columnModel = table.getColumnModel();
        int vci = columnModel.getColumnIndexAtX(e.getX());
        int mci = table.convertColumnIndexToModel(vci);
        if (mci == targetColumnIndex) {
          TableColumn column = columnModel.getColumn(vci);
          boolean b = column.getHeaderValue() == Status.DESELECTED;
          TableModel m = table.getModel();
          for (int i = 0; i < m.getRowCount(); i++) {
            m.setValueAt(b, i, mci);
          }
          column.setHeaderValue(b ? Status.SELECTED : Status.DESELECTED);
          // header.repaint();
        }
      }
    });
  }

  @Override public Component getTableCellRendererComponent(
        JTable tbl, Object val, boolean isS, boolean hasF, int row, int col) {
    TableCellRenderer r = tbl.getTableHeader().getDefaultRenderer();
    JLabel l = (JLabel) r.getTableCellRendererComponent(tbl, val, isS, hasF, row, col);
    if (targetColumnIndex == tbl.convertColumnIndexToModel(col)) {
      if (val instanceof Status) {
        switch ((Status) val) {
        case SELECTED:
          setSelected(true);
          setEnabled(true);
          break;
        case DESELECTED:
          setSelected(false);
          setEnabled(true);
          break;
        case INDETERMINATE:
          setSelected(true);
          setEnabled(false);
          break;
        default:
          throw new AssertionError("Unknown Status");
        }
      } else {
        setSelected(true);
        setEnabled(false);
      }
      label.setIcon(new ComponentIcon(this));
      l.setIcon(new ComponentIcon(label));
      l.setText(null);
    }
    return l;
  }
}

class ComponentIcon implements Icon {
  private final JComponent cmp;

  public ComponentIcon(JComponent cmp) {
    this.cmp = cmp;
  }

  @Override public int getIconWidth() {
    return cmp.getPreferredSize().width;
  }

  @Override public int getIconHeight() {
    return cmp.getPreferredSize().height;
  }

  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    SwingUtilities.paintComponent(
        g, cmp, c.getParent(), x, y, getIconWidth(), getIconHeight());
  }
}

References

JTableHeader CheckBox(Japanese)

2009/01/23

create Auto Suggest JComboBox

Code

String[] array = {
    "aaaa", "aaaabbb", "aaaabbbcc", "aaaabbbccddd",
    "abcde", "abefg", "bbb1", "bbb12"};
JComboBox combo = new JComboBox(array);
combo.setEditable(true);
combo.setSelectedIndex(-1);
JTextField field = (JTextField) combo.getEditor().getEditorComponent();
field.setText("");
field.addKeyListener(new ComboKeyHandler(combo));

// ...
class ComboKeyHandler extends KeyAdapter {
  private final JComboBox<String> comboBox;
  private final List<String> list = new ArrayList<>();
  private boolean shouldHide;

  public ComboKeyHandler(JComboBox<String> combo) {
    super();
    this.comboBox = combo;
    for (int i = 0; i < comboBox.getModel().getSize(); i++) {
      list.add(comboBox.getItemAt(i));
    }
  }

  @Override public void keyTyped(final KeyEvent e) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        String text = ((JTextField) e.getComponent()).getText();
        ComboBoxModel<String> m;
        if (text.isEmpty()) {
          String[] array = list.toArray(new String[list.size()]);
          m = new DefaultComboBoxModel<String>(array);
          setSuggestionModel(comboBox, m, "");
          comboBox.hidePopup();
        } else {
          m = getSuggestedModel(list, text);
          if (m.getSize() == 0 || shouldHide) {
            comboBox.hidePopup();
          } else {
            setSuggestionModel(comboBox, m, text);
            comboBox.showPopup();
          }
        }
      }
    });
  }

  @Override public void keyPressed(KeyEvent e) {
    JTextField textField = (JTextField) e.getComponent();
    String text = textField.getText();
    shouldHide = false;
    switch (e.getKeyCode()) {
    case KeyEvent.VK_RIGHT:
      for (String s : list) {
        if (s.startsWith(text)) {
          textField.setText(s);
          return;
        }
      }
      break;
    case KeyEvent.VK_ENTER:
      if (!list.contains(text)) {
        list.add(text);
        Collections.sort(list);
        setSuggestionModel(comboBox, getSuggestedModel(list, text), text);
      }
      shouldHide = true;
      break;
    case KeyEvent.VK_ESCAPE:
      shouldHide = true;
      break;
    default:
      break;
    }
  }

  private static void setSuggestionModel(
      JComboBox<String> comboBox, ComboBoxModel<String> mdl, String str) {
    comboBox.setModel(mdl);
    comboBox.setSelectedIndex(-1);
    ((JTextField) comboBox.getEditor().getEditorComponent()).setText(str);
  }

  private static ComboBoxModel<String> getSuggestedModel(List<String> list, String text) {
    DefaultComboBoxModel<String> m = new DefaultComboBoxModel<>();
    for (String s : list) {
      if (s.startsWith(text)) {
        m.addElement(s);
      }
    }
    return m;
  }
}

References

Create Auto Suggest JComboBox(Japanese)

2008/12/25

JTable FishEye Row

Code

@Override public void mouseMoved(MouseEvent e) {
  int row = rowAtPoint(e.getPoint());
  if (prev_row == row) {
    return;
  }
  initRowHeight(prev_height, row);
  prev_row = row;
}

public void initRowHeight(int height, int ccRow) {
  int rd2 = (fishEyeRowList.size() - 1) / 2;
  int rowCount = getModel().getRowCount();
  int view_rc = getViewableColoredRowCount(ccRow);
  int view_h = 0;
  for (int i = 0; i < view_rc; i++) {
    view_h += fishEyeRowHeightList.get(i);
  }
  int rest_rc = rowCount - view_rc;
  int rest_h = height - view_h;
  int rest_rh  = rest_h / rest_rc; rest_rh = rest_rh > 0 ? rest_rh : 1;
  int a = rest_h - rest_rh * rest_rc;
  int index = -1;
  for (int i = -rd2; i < rowCount; i++) {
    int crh;
    if (ccRow - rd2 <= i && i <= ccRow + rd2) {
      index++;
      if (i < 0) continue;
      crh = fishEyeRowHeightList.get(index);
    } else {
      if (i < 0) continue;
      crh = rest_rh + (a > 0 ? 1 : 0);
      a = a - 1;
    }
    setRowHeight(i, crh);
  }
}

References

JTable FishEye Row(Japanese)

Google Tag Manager

2009/02/27

HyperLink in JTable Cell

Code

References

2009/02/26

Use JScrollBar as JSlider

Code

References

2009/02/16

JTableHeader CheckBox

Code

References

2009/01/23

create Auto Suggest JComboBox

Code

References

2008/12/25

JTable FishEye Row

Code

References