Java Swing Tips: JButton

Showing posts with label JButton. Show all posts

2025/06/30

Automatically open and close JPopupMenu without mouse click

Code

/* If the mouse cursor goes out of the region at high speed, JPopupMenu may not close, use AWTEventListener to work around this problem. */
class AutoClosePopupMenu extends JPopupMenu {
  private transient PopupMenuListener listener;

  @Override public void updateUI() {
    removePopupMenuListener(listener);
    super.updateUI();
    listener = new AwtPopupMenuListener();
    addPopupMenuListener(listener);
  }

  private void checkAutoClose(MouseEvent e) {
    Component c = e.getComponent();
    Rectangle r = getBounds();
    r.grow(0, 5);
    Point pt = SwingUtilities.convertPoint(c, e.getPoint(), this);
    if (!r.contains(pt) && !(c instanceof JButton)) {
      setVisible(false);
    }
  }

  private final class AwtPopupMenuListener implements PopupMenuListener {
    private final AWTEventListener handler = e -> {
      if (e instanceof MouseEvent) {
        int id = e.getID();
        if (id == MouseEvent.MOUSE_MOVED || id == MouseEvent.MOUSE_EXITED) {
          checkAutoClose((MouseEvent) e);
        }
      }
    };

    @Override public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
      long mask = AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK;
      Toolkit.getDefaultToolkit().addAWTEventListener(handler, mask);
    }

    @Override public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
      Toolkit.getDefaultToolkit().removeAWTEventListener(handler);
    }

    @Override public void popupMenuCanceled(PopupMenuEvent e) {
      /* not needed */
    }
  }
}

Set up an event listener to automatically open JPopupMenu when the mouse cursor enters the JButton area and automatically close it when the mouse cursor leaves the JButton or JPopupMenu area.

References

Automatically open and close JPopupMenu without mouse click(Japanese)

2024/08/31

Set JButton as cell renderer for JTableHeader

Code

class ButtonHeaderRenderer extends JButton implements TableCellRenderer {
  private int pushedColumn = -1;
  private int rolloverColumn = -1;

  @Override public void updateUI() {
    super.updateUI();
    setHorizontalTextPosition(LEFT);
  }

  @Override public Component getTableCellRendererComponent(
      JTable table, Object value,
      boolean isSelected, boolean hasFocus,
      int row, int column) {
    setText(Objects.toString(value, ""));
    int modelColumn = table.convertColumnIndexToModel(column);
    JTableHeader header = table.getTableHeader();
    if (header != null) {
      // setColor(header, hasFocus);
      boolean isPressed = modelColumn == pressedColumn;
      getModel().setPressed(isPressed);
      getModel().setArmed(isPressed);
      getModel().setRollover(modelColumn == rolloverColumn);
      setFont(header.getFont());
    }

    Icon sortIcon = null;
    if (table.getRowSorter() != null) {
      List<? extends RowSorter.SortKey> sortKeys =
          table.getRowSorter().getSortKeys();
      if (!sortKeys.isEmpty() &&
          sortKeys.get(0).getColumn() == modelColumn) {
        SortOrder sortOrder = sortKeys.get(0).getSortOrder();
        switch (sortOrder) {
          case ASCENDING:
            sortIcon = UIManager.getIcon("Table.ascendingSortIcon");
            break;
          case DESCENDING:
            sortIcon = UIManager.getIcon("Table.descendingSortIcon");
            break;
          // case UNSORTED:
          //   sortIcon = UIManager.getIcon("Table.naturalSortIcon");
          //   break;
          default:
            sortIcon = UIManager.getIcon("Table.naturalSortIcon");
        }
      }
    }
    setIcon(sortIcon);
    return this;
  }

  public void setPressedColumn(int column) {
    pushedColumn = column;
  }

  public void setRolloverColumn(int column) {
    rolloverColumn = column;
  }
}

class HeaderMouseListener extends MouseAdapter {
  @Override public void mousePressed(MouseEvent e) {
    JTableHeader header = (JTableHeader) e.getComponent();
    JTable table = header.getTable();
    TableCellRenderer renderer = header.getDefaultRenderer();
    int viewColumn = table.columnAtPoint(e.getPoint());
    if (viewColumn >= 0 && renderer instanceof ButtonHeaderRenderer) {
      int column = table.convertColumnIndexToModel(viewColumn);
      ((ButtonHeaderRenderer) renderer).setPressedColumn(column);
    }
  }

  @Override public void mouseReleased(MouseEvent e) {
    JTableHeader header = (JTableHeader) e.getComponent();
    TableCellRenderer renderer = header.getDefaultRenderer();
    if (renderer instanceof ButtonHeaderRenderer) {
      ((ButtonHeaderRenderer) renderer).setPressedColumn(-1);
    }
  }

  @Override public void mouseMoved(MouseEvent e) {
    JTableHeader header = (JTableHeader) e.getComponent();
    JTable table = header.getTable();
    TableCellRenderer renderer = header.getDefaultRenderer();
    int viewColumn = table.columnAtPoint(e.getPoint());
    if (viewColumn >= 0 && renderer instanceof ButtonHeaderRenderer) {
      int column = table.convertColumnIndexToModel(viewColumn);
      ((ButtonHeaderRenderer) renderer).setRolloverColumn(column);
    }
  }

  @Override public void mouseExited(MouseEvent e) {
    JTableHeader header = (JTableHeader) e.getComponent();
    TableCellRenderer renderer = header.getDefaultRenderer();
    if (renderer instanceof ButtonHeaderRenderer) {
      ((ButtonHeaderRenderer) renderer).setRolloverColumn(-1);
    }
  }
}

References

Set JButton as cell renderer for JTableHeader(Japanese)

2023/09/30

Move the selected item in JList up or down by clicking on the JButton placed on the JToolBar

Since DefaultListModel does not have a move method like DefaultTableModel#moveRow(int start, int end, int to), the DefaultListModel#get(int index), DefaultListModel#remove(int index), and DefaultListModel#add(int index, E element) methods are used in combination to move selected items up and down the JList.

Code

JButton up = new JButton("▲");
up.setFocusable(false);
up.addActionListener(e -> {
  int[] pos = list.getSelectedIndices();
  if (pos.length == 0) {
    return;
  }
  boolean isShiftDown = (e.getModifiers() & ActionEvent.SHIFT_MASK) != 0;
  int index0 = isShiftDown ? 0 : Math.max(0, pos[0] - 1);
  int idx = index0;
  for (int i : pos) {
    model.add(idx, model.remove(i));
    list.addSelectionInterval(idx, idx);
    idx++;
  }
  // scroll
  Rectangle r = list.getCellBounds(index0, index0 + pos.length);
  list.scrollRectToVisible(r);
});

JButton down = new JButton("▼");
down.setFocusable(false);
down.addActionListener(e -> {
  int[] pos = list.getSelectedIndices();
  if (pos.length == 0) {
    return;
  }
  boolean isShiftDown = (e.getModifiers() & ActionEvent.SHIFT_MASK) != 0;
  int max = model.getSize();
  int index = isShiftDown ? max : Math.min(max, pos[pos.length - 1] + 1);
  int index0 = index;
  // copy
  for (int i : pos) {
    int idx = Math.min(model.getSize(), ++index);
    model.add(idx, model.get(i));
    list.addSelectionInterval(idx, idx);
  }
  // clean
  for (int i = pos.length - 1; i >= 0; i--) {
    model.remove(pos[i]);
  }
  // scroll
  Rectangle r = list.getCellBounds(index0 - pos.length, index0);
  list.scrollRectToVisible(r);
});

References

Move the selected item in JList up or down by clicking on the JButton placed on the JToolBar(Japanese)

2021/08/31

Add a JButton to the bottom right inside the JScrollPane to scroll back to the top area of the child component

Code

class ScrollBackToTopLayerUI extends LayerUI<JScrollPane> {
  private static final int GAP = 5;
  private final Container rubberStamp = new JPanel();
  private final Point mousePt = new Point();
  private final JButton button = new JButton(new ScrollBackToTopIcon()) {
    @Override public void updateUI() {
      super.updateUI();
      setBorder(BorderFactory.createEmptyBorder());
      setFocusPainted(false);
      setBorderPainted(false);
      setContentAreaFilled(false);
      setRolloverEnabled(false);
    }
  };
  private final Rectangle buttonRect = new Rectangle(button.getPreferredSize());

  private void updateButtonRect(JScrollPane scroll) {
    JViewport viewport = scroll.getViewport();
    int x = viewport.getX() + viewport.getWidth() - buttonRect.width - GAP;
    int y = viewport.getY() + viewport.getHeight() - buttonRect.height - GAP;
    buttonRect.setLocation(x, y);
  }

  @Override public void paint(Graphics g, JComponent c) {
    super.paint(g, c);
    if (c instanceof JLayer) {
      JScrollPane scroll = (JScrollPane) ((JLayer<?>) c).getView();
      updateButtonRect(scroll);
      if (scroll.getViewport().getViewRect().y > 0) {
        button.getModel().setRollover(buttonRect.contains(mousePt));
        SwingUtilities.paintComponent(g, button, rubberStamp, buttonRect);
      }
    }
  }

  @Override public void installUI(JComponent c) {
    super.installUI(c);
    if (c instanceof JLayer) {
      ((JLayer<?>) c).setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
    }
  }

  @Override public void uninstallUI(JComponent c) {
    if (c instanceof JLayer) {
      ((JLayer<?>) c).setLayerEventMask(0);
    }
    super.uninstallUI(c);
  }

  @Override protected void processMouseEvent(MouseEvent e, JLayer<? extends JScrollPane> l) {
    JScrollPane scroll = l.getView();
    Rectangle r = scroll.getViewport().getViewRect();
    Point p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), scroll);
    mousePt.setLocation(p);
    int id = e.getID();
    if (id == MouseEvent.MOUSE_CLICKED) {
      if (buttonRect.contains(mousePt)) {
        scrollBackToTop(l.getView());
      }
    } else if (id == MouseEvent.MOUSE_PRESSED && r.y > 0 && buttonRect.contains(mousePt)) {
      e.consume();
    }
  }

  @Override protected void processMouseMotionEvent(MouseEvent e, JLayer<? extends JScrollPane> l) {
    Point p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), l.getView());
    mousePt.setLocation(p);
    l.repaint(buttonRect);
  }

  private void scrollBackToTop(JScrollPane scroll) {
    JComponent c = (JComponent) scroll.getViewport().getView();
    Rectangle current = scroll.getViewport().getViewRect();
    new Timer(20, e -> {
      Timer animator = (Timer) e.getSource();
      if (0 < current.y && animator.isRunning()) {
        current.y -= Math.max(1, current.y / 2);
        c.scrollRectToVisible(current);
      } else {
        animator.stop();
      }
    }).start();
  }
}

References

Add a JButton to the bottom right inside the JScrollPane to scroll back to the top area of the child component(Japanese)

2019/04/25

Use the GridBagLayout to layout the JButton like a keyboard

Code

private static final String[][] KEYS = {
  {"`", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-", "=", "BS"},
  {"Tab", "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P", "[", "]", "\\", ""},
  {"Ctrl", "A", "S", "D", "F", "G", "H", "J", "K", "L", ";", "'", "Enter", ""},
  {"Shift", "Z", "X", "C", "V", "B", "N", "M", ",", ".", "/", "", "↑"},
  {"Fn", "Alt", "                             ", "Alt", "←", "↓", "→"}
};

private static Component makeKeyboardPanel() {
  JPanel keyboard = new JPanel(new GridBagLayout());

  GridBagConstraints c = new GridBagConstraints();
  c.fill = GridBagConstraints.BOTH;
  c.gridy = 50;
  for (int i = 0; i < KEYS[0].length * 2; i++) {
    c.gridx = i;
    keyboard.add(Box.createHorizontalStrut(KeyButton.SIZE));
  }

  for (int row = 0; row < KEYS.length; row++) {
    c.gridx = 0;
    c.gridy = row;
    for (int col = 0; col < KEYS[row].length; col++) {
      String key = KEYS[row][col];
      int len = key.length();
      c.gridwidth = len > 10 ? 14
                  : len > 4  ? 4
                  : len > 1  ? 3
                  : len == 1 ? 2 : 1;
      if (key.isEmpty()) {
        keyboard.add(Box.createHorizontalStrut(KeyButton.SIZE), c);
      } else {
        keyboard.add(new KeyButton(key, len <= 2), c);
      }
      c.gridx += c.gridwidth;
    }
  }
  EventQueue.invokeLater(() -> SwingUtilities.updateComponentTreeUI(keyboard));
  return keyboard;
}

References

2019/03/27

Perform hover effect animation using RadialGradientPaint on soft clipped JButton

Code

protected void update() {
  if (!getBounds().equals(base)) {
    base = getBounds();
    int w = getWidth();
    int h = getHeight();
    if (w > 0 && h > 0) {
      buf = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
    }
    shape = new RoundRectangle2D.Double(
      0, 0, w - 1, h - 1, ARC_WIDTH, ARC_HEIGHT);
  }
  if (buf == null) {
    return;
  }

  Graphics2D g2 = buf.createGraphics();
  g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                      RenderingHints.VALUE_ANTIALIAS_ON);
  Color c1 = new Color(0x00_F7_23_59, true);
  Color c2 = new Color(0x64_44_05_F7, true);

  g2.setComposite(AlphaComposite.Clear);
  g2.fillRect(0, 0, getWidth(), getHeight());

  g2.setComposite(AlphaComposite.Src);
  g2.setPaint(new Color(getModel().isArmed() ? 0xFF_AA_AA : 0xF7_23_59));
  g2.fill(shape);

  if (radius > 0) {
    int cx = pt.x - radius;
    int cy = pt.y - radius;
    int r2 = radius + radius;
    float[] dist = { 0f, 1f };
    Color[] colors = { c2, c1 };
    g2.setPaint(new RadialGradientPaint(pt, r2, dist, colors));
    g2.setComposite(AlphaComposite.SrcAtop);
    // g2.setClip(shape);
    g2.fill(new Ellipse2D.Double(cx, cy, r2, r2));
  }
  g2.dispose();
}

References

2014/03/27

Long pressing the JButton to get a JPopupMenu

Code

class PressAndHoldHandler extends AbstractAction implements MouseListener {
  public final JPopupMenu pop = new JPopupMenu();
  public final ButtonGroup bg = new ButtonGroup();
  private AbstractButton arrowButton;
  private final Timer holdTimer = new Timer(1000, e -> {
    if (arrowButton != null && arrowButton.getModel().isPressed()
        && holdTimer.isRunning()) {
      holdTimer.stop();
      pop.show(arrowButton, 0, arrowButton.getHeight());
      pop.requestFocusInWindow();
    }
  });

  public PressAndHoldHandler() {
    super();
    holdTimer.setInitialDelay(1000);
    pop.setLayout(new GridLayout(0, 3, 5, 5));
    for (MenuContext m: makeMenuList()) {
      AbstractButton b = new JRadioButton(m.command);
      b.setActionCommand(m.command);
      b.setForeground(m.color);
      b.setBorder(BorderFactory.createEmptyBorder());
      b.addActionListener(e -> {
        System.out.println(e.getActionCommand());
        pop.setVisible(false);
      });
      pop.add(b);
      bg.add(b);
    }
  }

  private List<MenuContext> makeMenuList() {
    return Arrays.asList(
      new MenuContext("BLACK", Color.BLACK),
      new MenuContext("BLUE", Color.BLUE),
      new MenuContext("CYAN", Color.CYAN),
      new MenuContext("GREEN", Color.GREEN),
      new MenuContext("MAGENTA", Color.MAGENTA),
      new MenuContext("ORANGE", Color.ORANGE),
      new MenuContext("PINK", Color.PINK),
      new MenuContext("RED", Color.RED),
      new MenuContext("YELLOW", Color.YELLOW));
  }

  @Override public void actionPerformed(ActionEvent e) {
    System.out.println("actionPerformed");
    if (holdTimer.isRunning()) {
      ButtonModel model = bg.getSelection();
      if (model != null) {
        System.out.println(model.getActionCommand());
      }
      holdTimer.stop();
    }
  }

  @Override public void mousePressed(MouseEvent e) {
    System.out.println("mousePressed");
    Component c = e.getComponent();
    if (SwingUtilities.isLeftMouseButton(e) && c.isEnabled()) {
      arrowButton = (AbstractButton) c;
      holdTimer.start();
    }
  }

  @Override public void mouseReleased(MouseEvent e) {
    holdTimer.stop();
  }

  @Override public void mouseExited(MouseEvent e) {
    if (holdTimer.isRunning()) {
      holdTimer.stop();
    }
  }

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

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

References

Long pressing the JButton to get a JPopupMenu(Japanese)

2013/11/25

Cut copy paste buttuns in the JMenuItem

Code

private static JMenuItem makeEditMenuItem(final JComponent edit) {
  JMenuItem item = new JMenuItem("Edit") {
    @Override public Dimension getPreferredSize() {
      Dimension d = super.getPreferredSize();
      d.width += edit.getPreferredSize().width;
      d.height = Math.max(edit.getPreferredSize().height, d.height);
      return d;
    }

    @Override protected void fireStateChanged() {
      setForeground(Color.BLACK);
      super.fireStateChanged();
    }
  };
  item.setEnabled(false);

  GridBagConstraints c = new GridBagConstraints();
  item.setLayout(new GridBagLayout());
  c.anchor  = GridBagConstraints.LINE_END;
  c.weightx = 1d;

  c.fill = GridBagConstraints.HORIZONTAL;
  item.add(Box.createHorizontalGlue(), c);
  c.fill = GridBagConstraints.NONE;
  item.add(edit, c);

  return item;
}

private static JPanel makeEditButtonBar(List<AbstractButton> list) {
  int size = list.size();
  JPanel p = new JPanel(new GridLayout(1, size, 0, 0)) {
    @Override public Dimension getMaximumSize() {
      return super.getPreferredSize();
    }
  };
  for (AbstractButton b: list) {
    b.setIcon(new ToggleButtonBarCellIcon());
    p.add(b);
  }
  p.setBorder(BorderFactory.createEmptyBorder(4, 10, 4, 10));
  p.setOpaque(false);
  return p;
}

private static AbstractButton makeButton(String title, Action action) {
  JButton b = new JButton(action);
  b.addActionListener(new ActionListener() {
    @Override public void actionPerformed(ActionEvent e) {
      JButton b = (JButton) e.getSource();
      Container c = SwingUtilities.getAncestorOfClass(JPopupMenu.class, b);
      if (c instanceof JPopupMenu) {
        ((JPopupMenu) c).setVisible(false);
      }
    }
  });
  b.setText(title);
  b.setVerticalAlignment(SwingConstants.CENTER);
  b.setVerticalTextPosition(SwingConstants.CENTER);
  b.setHorizontalAlignment(SwingConstants.CENTER);
  b.setHorizontalTextPosition(SwingConstants.CENTER);
  b.setBorder(BorderFactory.createEmptyBorder());
  b.setContentAreaFilled(false);
  b.setFocusPainted(false);
  b.setOpaque(false);
  b.setBorder(BorderFactory.createEmptyBorder());
  return b;
}

References

2013/08/29

Create 9-slice scaling image JButton

Code

class NineSliceScalingIcon implements Icon {
  private final BufferedImage image;
  private final int leftw;
  private final int rightw;
  private final int toph;
  private final int bottomh;
  private int width;
  private int height;
  protected NineSliceScalingIcon(
      BufferedImage image, int leftw, int rightw, int toph, int bottomh) {
    this.image = image;
    this.leftw = leftw;
    this.rightw = rightw;
    this.toph = toph;
    this.bottomh = bottomh;
  }

  @Override public int getIconWidth() {
    return width; // Math.max(image.getWidth(null), width);
  }

  @Override public int getIconHeight() {
    return Math.max(image.getHeight(null), height);
  }

  @Override public void paintIcon(Component cmp, Graphics g, int x, int y) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    Insets i = cmp instanceof Container ? ((Container) cmp).getInsets()
                                        : new Insets(0, 0, 0, 0);
    // g2.translate(x, y); // 1.8.0: work fine?
    int iw = image.getWidth(cmp);
    int ih = image.getHeight(cmp);
    width  = cmp.getWidth() - i.left - i.right;
    height = cmp.getHeight() - i.top - i.bottom;

    g2.drawImage(
        image.getSubimage(leftw, toph, iw - leftw - rightw, ih - toph - bottomh),
        leftw, toph, width - leftw - rightw, height - toph - bottomh, cmp);
    if (leftw > 0 && rightw > 0 && toph > 0 && bottomh > 0) {
      g2.drawImage(image.getSubimage(leftw, 0, iw - leftw - rightw, toph),
                   leftw, 0, width - leftw - rightw, toph, cmp);
      g2.drawImage(image.getSubimage(leftw, ih - bottomh, iw - leftw - rightw, bottomh),
                   leftw, height - bottomh, width - leftw - rightw, bottomh, cmp);
      g2.drawImage(image.getSubimage(0, toph, leftw, ih - toph - bottomh),
                   0, toph, leftw, height - toph - bottomh, cmp);
      g2.drawImage(image.getSubimage(iw - rightw, toph, rightw, ih - toph - bottomh),
                   width - rightw, toph, rightw, height - toph - bottomh, cmp);

      g2.drawImage(image.getSubimage(0, 0, leftw, toph),
                   0, 0, cmp);
      g2.drawImage(image.getSubimage(iw - rightw, 0, rightw, toph),
                   width - rightw, 0, cmp);
      g2.drawImage(image.getSubimage(0, ih - bottomh, leftw, bottomh),
                   0, height - bottomh, cmp);
      g2.drawImage(image.getSubimage(iw - rightw, ih - bottomh, rightw, bottomh),
                   width - rightw, height - bottomh, cmp);
    }
    g2.dispose();
  }
}

References

2013/01/08

make a translucent JButton

Code

class TranslucentButton extends JButton {
  private static final Color TL = new Color(1f, 1f, 1f, .2f);
  private static final Color BR = new Color(0f, 0f, 0f, .4f);
  private static final Color ST = new Color(1f, 1f, 1f, .2f);
  private static final Color SB = new Color(1f, 1f, 1f, .1f);
  private Color ssc;
  private Color bgc;
  private int r = 8;

  public TranslucentButton(String text) {
    super(text);
  }

  public TranslucentButton(String text, Icon icon) {
    super(text, icon);
  }

  @Override public void updateUI() {
    super.updateUI();
    setContentAreaFilled(false);
    setFocusPainted(false);
    setOpaque(false);
    setForeground(Color.WHITE);
  }

  @Override protected void paintComponent(Graphics g) {
    int x = 0;
    int y = 0;
    int w = getWidth();
    int h = getHeight();
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(
      RenderingHints.KEY_ANTIALIASING,
      RenderingHints.VALUE_ANTIALIAS_ON);
    Shape area = new RoundRectangle2D.Float(x, y, w - 1, h - 1, r, r);
    ssc = TL;
    bgc = BR;
    ButtonModel m = getModel();
    if (m.isPressed()) {
      ssc = SB;
      bgc = ST;
    } else if (m.isRollover()) {
      ssc = ST;
      bgc = SB;
    }
    g2.setPaint(new GradientPaint(x, y, ssc, x, y + h, bgc, true));
    g2.fill(area);
    g2.setPaint(BR);
    g2.draw(area);
    g2.dispose();
    super.paintComponent(g);
  }
}

// ...
private static String makeTitleWithIcon(URL u, String t, String a) {
  return String.format(
    "<html><p align='%s'><img src='%s' align='%s' />&nbsp;%s", a, u, a, t);
}

private static AbstractButton makeButton(String title) {
  return new JButton(title) {
    @Override public void updateUI() {
      super.updateUI();
      setVerticalAlignment(SwingConstants.CENTER);
      setVerticalTextPosition(SwingConstants.CENTER);
      setHorizontalAlignment(SwingConstants.CENTER);
      setHorizontalTextPosition(SwingConstants.CENTER);
      setMargin(new Insets(2, 8, 2, 8));
      setBorder(BorderFactory.createEmptyBorder(2, 8, 2, 8));
      // setBorderPainted(false);
      setContentAreaFilled(false);
      setFocusPainted(false);
      setOpaque(false);
      setForeground(Color.WHITE);
      setIcon(new TranslucentButtonIcon());
    }
  };
}

References

2012/12/09

Combine five JButtons to make CompoundButton

Code

private static JComponent makeCompoundButton(final Dimension d) {
  JPanel p = new JPanel() {
    @Override public Dimension getPreferredSize() {
      return d;
    }
  };
  p.setLayout(new OverlayLayout(p));
  p.add(new CompoundButton(d, ButtonLocation.NORTH));
  p.add(new CompoundButton(d, ButtonLocation.SOUTH));
  p.add(new CompoundButton(d, ButtonLocation.EAST));
  p.add(new CompoundButton(d, ButtonLocation.WEST));
  p.add(new CompoundButton(d, ButtonLocation.CENTER));
  return p;
}

class CompoundButton extends JButton {
  protected final Color fc = new Color(100, 150, 255, 200);
  protected final Color ac = new Color(230, 230, 230);
  protected final Color rc = Color.ORANGE;
  protected Shape shape;
  protected Shape base = null;
  private final ButtonLocation bl;
  private final Dimension dim;
  public CompoundButton(Dimension d, ButtonLocation bl) {
    super();
    this.dim = d;
    this.bl = bl;
    setIcon(new Icon() {
      @Override public void paintIcon(Component c, Graphics g, int x, int y) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if (getModel().isArmed()) {
          g2.setColor(ac);
          g2.fill(shape);
        } else if (isRolloverEnabled() && getModel().isRollover()) {
          paintFocusAndRollover(g2, rc);
        } else if (hasFocus()) {
          paintFocusAndRollover(g2, fc);
        } else {
          g2.setColor(getBackground());
          g2.fill(shape);
        }
        g2.dispose();
      }

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

      @Override public int getIconHeight() {
        return dim.height;
      }
    });
    setFocusPainted(false);
    setContentAreaFilled(false);
    setBackground(new Color(250, 250, 250));
    initShape();
  }

  @Override public Dimension getPreferredSize() {
    return dim;
  }

  protected void initShape() {
    if (!getBounds().equals(base)) {
      base = getBounds();
      float ww = getWidth() * .5f;
      float xx = ww * .5f;
      Shape inner = new Ellipse2D.Float(xx, xx, ww, ww);
      if (ButtonLocation.CENTER == bl) {
        shape = inner;
      } else {
        Shape outer = new Arc2D.Float(
          1, 1, getWidth() - 2, getHeight() - 2,
          bl.getStartDegree(), 90f, Arc2D.PIE);
        Area area = new Area(outer);
        area.subtract(new Area(inner));
        shape = area;
      }
    }
  }

  private void paintFocusAndRollover(Graphics2D g2, Color color) {
    g2.setPaint(new GradientPaint(
        0, 0, color, getWidth() - 1, getHeight() - 1, color.brighter(), true));
    g2.fill(shape);
    g2.setColor(getBackground());
  }

  @Override protected void paintComponent(Graphics g) {
    initShape();
    super.paintComponent(g);
  }

  @Override protected void paintBorder(Graphics g) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(getForeground());
    g2.draw(shape);
    g2.dispose();
  }

  @Override public boolean contains(int x, int y) {
    // initShape();
    return shape.contains(x, y);
  }
}

References

Combine five JButtons to make CompoundButton(Japanese)

2012/10/29

Delete button in a JComboBox popup menu items

Code

class CellButtonsMouseListener extends MouseAdapter {
  @Override public void mouseMoved(MouseEvent e) {
    JList<?> list = (JList<?>) e.getComponent();
    Point pt = e.getPoint();
    int index = list.locationToIndex(pt);
    ButtonsRenderer<?> renderer = (ButtonsRenderer<?>) list.getCellRenderer();
    renderer.rolloverIndex = Objects.nonNull(getButton(list, pt, index)) ? index : -1;
    list.repaint();
  }

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

  @Override public void mouseReleased(MouseEvent e) {
    JList<?> list = (JList<?>) e.getComponent();
    Point pt = e.getPoint();
    int index = list.locationToIndex(pt);
    if (index >= 0) {
      JButton button = getButton(list, pt, index);
      if (Objects.nonNull(button)) {
        button.doClick();
      }
    }
    ((ButtonsRenderer<?>) list.getCellRenderer()).rolloverIndex = -1;
    list.repaint();
  }

  @Override public void mouseExited(MouseEvent e) {
    JList<?> list = (JList<?>) e.getComponent();
    ((ButtonsRenderer<?>) list.getCellRenderer()).rolloverIndex = -1;
  }

  private static <E> JButton getButton(JList<E> list, Point pt, int index) {
    E proto = list.getPrototypeCellValue();
    Component c = list.getCellRenderer().getListCellRendererComponent(
        list, proto, index, false, false);
    Rectangle r = list.getCellBounds(index, index);
    c.setBounds(r);
    // c.doLayout(); // may be needed for other layout managers (eg. FlowLayout)
    pt.translate(-r.x, -r.y);
    return Optional.ofNullable(SwingUtilities.getDeepestComponentAt(c, pt.x, pt.y))
        .filter(JButton.class::isInstance).map(JButton.class::cast).orElse(null);
  }
}

References

Delete button in a JComboBox popup menu items(Japanese)

2011/12/22

Dropdown menu button in the JTableHeader

Code

@Override public void mouseClicked(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  TableColumn column = table.getColumnModel().getColumn(mci);
  Rectangle r = header.getHeaderRect(vci);
  Container c = (Container) getTableCellRendererComponent(table, "", true, true, -1, vci);
  // if (!isNimbus) {
  //   Insets i = c.getInsets();
  //   r.translate(r.width - i.right, 0);
  // } else {
  r.translate(r.width - BUTTON_WIDTH, 0);
  r.setSize(BUTTON_WIDTH, r.height);
  Point pt = e.getPoint();
  if (c.getComponentCount() > 0 && r.contains(pt) && pop != null) {
    pop.show(header, r.x, r.height);
    JButton b = (JButton) c.getComponent(0);
    b.doClick();
    e.consume();
  }
}

@Override public void mouseExited(MouseEvent e) {
  rolloverIndex = -1;
}

@Override public void mouseMoved(MouseEvent e) {
  JTableHeader header = (JTableHeader) e.getSource();
  JTable table = header.getTable();
  TableColumnModel columnModel = table.getColumnModel();
  int vci = columnModel.getColumnIndexAtX(e.getX());
  int mci = table.convertColumnIndexToModel(vci);
  rolloverIndex = mci;
}

References

Dropdown menu button in the JTableHeader(Japanese)

2011/10/28

fixed width JButtons in bottom right corner of the JPanel

Code

private static JComponent createRightAlignButtonBox2(
  List<JButton> list, final int buttonWidth, int gap) {
  JComponent box = new JPanel() {
    @Override public void updateUI() {
      for (JButton b : list) {
        b.setPreferredSize(null);
      }
      super.updateUI();
      EventQueue.invokeLater(new Runnable() {
        @Override public void run() {
          int maxHeight = list.stream()
            .map(b -> b.getPreferredSize().height)
            .reduce(0, Integer::max);
          Dimension d = new Dimension(buttonWidth, maxHeight);
          for (JButton b : list) {
            b.setPreferredSize(d);
          }
          revalidate();
        }
      });
    }
  };
  box.setLayout(new BoxLayout(box, BoxLayout.X_AXIS));
  box.add(Box.createHorizontalGlue());
  for (JButton b : list) {
    box.add(b);
    box.add(Box.createHorizontalStrut(gap));
  }
  box.setBorder(BorderFactory.createEmptyBorder(gap, 0, gap, 0));
  return box;
}

References

fixed width JButtons in bottom right corner of the JPanel(Japanese)

2010/09/21

SearchBar JComboBox

Code

public class BasicSearchBarComboBoxUI extends SearchBarComboBoxUI {
  protected boolean isEditable = true;
  public static javax.swing.plaf.ComponentUI createUI(JComponent c) {
    return new BasicSearchBarComboBoxUI();
  }

  @Override protected void installDefaults() {
    super.installDefaults();
    // comboBox.setEditable(true);
    comboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
    // comboBox.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
  }

  @Override protected LayoutManager createLayoutManager() {
    return new LayoutManager() {
      @Override public void addLayoutComponent(String name, Component comp) {
        /* not needed */
      }

      @Override public void removeLayoutComponent(Component comp) {
        /* not needed */
      }

      @Override public Dimension preferredLayoutSize(Container parent) {
        return parent.getPreferredSize();
      }

      @Override public Dimension minimumLayoutSize(Container parent) {
        return parent.getMinimumSize();
      }

      @Override public void layoutContainer(Container parent) {
        if (!(parent instanceof JComboBox)) {
          return;
        }
        JComboBox<?> cb = (JComboBox<?>) parent;
        Rectangle r = SwingUtilities.calculateInnerArea(cb, null);

        int arrowSize = 0;
        JButton arrowButton = (JButton) cb.getComponent(0);
        if (Objects.nonNull(arrowButton)) {
          Insets arrowInsets = arrowButton.getInsets();
          int bw = arrowButton.getPreferredSize().width + arrowInsets.left + arrowInsets.right;
          arrowButton.setBounds(r.x, r.y, bw, r.height);
          arrowSize = bw;
        }
        JButton loupeButton = null;
        for (Component c : cb.getComponents()) {
          if ("ComboBox.loupeButton".equals(c.getName())) {
            loupeButton = (JButton) c;
            break;
          }
        }
        int loupeSize = 0;
        if (Objects.nonNull(loupeButton)) {
          loupeSize = r.height;
          loupeButton.setBounds(r.x + r.width - loupeSize, r.y, loupeSize, r.height);
        }
        JTextField editor = (JTextField) cb.getEditor().getEditorComponent();
        if (Objects.nonNull(editor)) {
          editor.setBounds(r.x + arrowSize, r.y, r.width - arrowSize - loupeSize, r.height);
        }
      }
    };
  }
  // ...

References

SearchBar JComboBox(Japanese)

2009/10/06

Multiple JButtons in a JTable cell

Code

class ButtonsPanel extends JPanel {
  public final List<JButton> buttons =
    Arrays.asList(new JButton("view"), new JButton("edit"));
  public ButtonsPanel() {
    super();
    setOpaque(true);
    for (JButton b: buttons) {
      b.setFocusable(false);
      b.setRolloverEnabled(false);
      add(b);
    }
  }
}

class ButtonsRenderer extends ButtonsPanel
                      implements TableCellRenderer {
  public ButtonsRenderer() {
    super();
    setName("Table.cellRenderer");
  }

  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected,
      boolean hasFocus, int row, int column) {
    Color bgc = isSelected ? table.getSelectionBackground()
                           : table.getBackground()
    setBackground(bgc);
    return this;
  }
}

class ButtonsEditor extends ButtonsPanel
                    implements TableCellEditor {
  public ButtonsEditor(final JTable table) {
    super();
    // ---->
    // DEBUG: view button click
    //   -> control key down + edit button(same cell) press
    //   -> remain selection color
    MouseListener ml = new MouseAdapter() {
      @Override public void mousePressed(MouseEvent e) {
        ButtonModel m = ((JButton) e.getSource()).getModel();
        if (m.isPressed() && table.isRowSelected(table.getEditingRow())
                          && e.isControlDown()) {
          setBackground(table.getBackground());
        }
      }
    };
    buttons.get(0).addMouseListener(ml);
    buttons.get(1).addMouseListener(ml);
    // <----

    buttons.get(0).addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        fireEditingStopped();
        JOptionPane.showMessageDialog(table, "Viewing");
      }
    });

    buttons.get(1).addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        int row = table.convertRowIndexToModel(table.getEditingRow());
        Object o = table.getModel().getValueAt(row, 0);
        fireEditingStopped();
        JOptionPane.showMessageDialog(table, "Editing: " + o);
      }
    });

    addMouseListener(new MouseAdapter() {
      @Override public void mousePressed(MouseEvent e) {
        fireEditingStopped();
      }
    });
  }

  @Override public Component getTableCellEditorComponent(JTable table,
        Object value, boolean isSelected, int row, int column) {
    this.setBackground(table.getSelectionBackground());
    return this;
  }

  @Override public Object getCellEditorValue() {
    return "";
  }

  // Copied from AbstractCellEditor
  // protected EventListenerList listenerList = new EventListenerList();
  transient protected ChangeEvent changeEvent = null;
  @Override public boolean isCellEditable(java.util.EventObject e) {
    return true;
  }
// ...

References

2009/08/17

Add JButton and JLabel to the EditorComponent of JComboBox

Code

class SiteComboBoxLayout implements LayoutManager {
  private final JLabel favicon;
  private final JButton feedButton;

  protected SiteComboBoxLayout(JLabel favicon, JButton feedButton) {
    this.favicon = favicon;
    this.feedButton = feedButton;
  }

  @Override public void addLayoutComponent(String name, Component comp) {
    /* not needed */
  }

  @Override public void removeLayoutComponent(Component comp) {
    /* not needed */
  }

  @Override public Dimension preferredLayoutSize(Container parent) {
    return parent.getPreferredSize();
  }

  @Override public Dimension minimumLayoutSize(Container parent) {
    return parent.getMinimumSize();
  }

  @Override public void layoutContainer(Container parent) {
    if (!(parent instanceof JComboBox)) {
      return;
    }
    JComboBox<?> cb = (JComboBox<?>) parent;
    int width = cb.getWidth();
    int height = cb.getHeight();
    Insets insets = cb.getInsets();
    int arrowHeight = height - insets.top - insets.bottom;
    int arrowWidth = arrowHeight;
    int faviconWidth = arrowHeight;
    int feedWidth; // = arrowHeight;

    // Arrow Icon JButton
    JButton arrowButton = (JButton) cb.getComponent(0);
    if (Objects.nonNull(arrowButton)) {
      Insets arrowInsets = arrowButton.getInsets();
      arrowWidth = arrowButton.getPreferredSize().width
        + arrowInsets.left + arrowInsets.right;
      arrowButton.setBounds(width - insets.right - arrowWidth, insets.top,
                            arrowWidth, arrowHeight);
    }

    // Favicon JLabel
    if (Objects.nonNull(favicon)) {
      Insets faviconInsets = favicon.getInsets();
      faviconWidth = favicon.getPreferredSize().width
          + faviconInsets.left + faviconInsets.right;
      favicon.setBounds(insets.left, insets.top, faviconWidth, arrowHeight);
    }

    // Feed Icon JButton
    if (Objects.nonNull(feedButton) && feedButton.isVisible()) {
      Insets feedInsets = feedButton.getInsets();
      feedWidth = feedButton.getPreferredSize().width
          + feedInsets.left + feedInsets.right;
      feedButton.setBounds(width - insets.right - feedWidth - arrowWidth, insets.top,
                           feedWidth, arrowHeight);
    } else {
      feedWidth = 0;
    }

    // JComboBox Editor
    Component editor = cb.getEditor().getEditorComponent();
    if (Objects.nonNull(editor)) {
      editor.setBounds(insets.left + faviconWidth, insets.top,
          width  - insets.left - insets.right - arrowWidth - faviconWidth - feedWidth,
          height - insets.top  - insets.bottom);
    }
  }
}

References

Add JButton and JLabel to the EditorComponent of JComboBox(Japanese)

2008/11/05

Rounded Corner JButton

Code

class RoundedCornerButton extends JButton {
  private static final float ARC_WIDTH = 16f;
  private static final float ARC_HEIGHT = 16f;
  protected static final int FOCUS_STROKE = 2;
  protected final Color fc = new Color(100, 150, 255, 200);
  protected final Color ac = new Color(230, 230, 230);
  protected final Color rc = Color.ORANGE;
  protected Shape shape;
  protected Shape border;
  protected Shape base;
  public RoundedCornerButton() {
    super();
  }

  public RoundedCornerButton(Icon icon) {
    super(icon);
  }

  public RoundedCornerButton(String text) {
    super(text);
  }

  public RoundedCornerButton(Action a) {
    super(a);
    // setAction(a);
  }

  public RoundedCornerButton(String text, Icon icon) {
    super(text, icon);
    // setModel(new DefaultButtonModel());
    // init(text, icon);
    // setContentAreaFilled(false);
    // setBackground(new Color(250, 250, 250));
    // initShape();
  }

  @Override public void updateUI() {
    super.updateUI();
    setContentAreaFilled(false);
    setFocusPainted(false);
    setBackground(new Color(250, 250, 250));
    initShape();
  }

  protected void initShape() {
    if (!getBounds().equals(base)) {
      base = getBounds();
      shape = new RoundRectangle2D.Float(
          0, 0, getWidth() - 1, getHeight() - 1, ARC_WIDTH, ARC_HEIGHT);
      border = new RoundRectangle2D.Float(
          FOCUS_STROKE, FOCUS_STROKE, getWidth() - 1 - FOCUS_STROKE * 2,
          getHeight() - 1 - FOCUS_STROKE * 2, ARC_WIDTH, ARC_HEIGHT);
    }
  }

  private void paintFocusAndRollover(Graphics2D g2, Color color) {
    g2.setPaint(new GradientPaint(
        0, 0, color, getWidth() - 1, getHeight() - 1,
        color.brighter(), true));
    g2.fill(shape);
    g2.setColor(getBackground());
    g2.fill(border);
  }

  @Override protected void paintComponent(Graphics g) {
    initShape();
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    if (getModel().isArmed()) {
      g2.setColor(ac);
      g2.fill(shape);
    } else if (isRolloverEnabled() && getModel().isRollover()) {
      paintFocusAndRollover(g2, rc);
    } else if (hasFocus()) {
      paintFocusAndRollover(g2, fc);
    } else {
      g2.setColor(getBackground());
      g2.fill(shape);
    }
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_OFF);
    g2.setColor(getBackground());
    super.paintComponent(g2);
    g2.dispose();
  }

  @Override protected void paintBorder(Graphics g) {
    initShape();
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(getForeground());
    g2.draw(shape);
    g2.dispose();
  }

  @Override public boolean contains(int x, int y) {
    initShape();
    return shape == null ? false : shape.contains(x, y);
  }
}

References

2008/07/29

create round image JButton

Code

class RoundButton extends JButton {
  protected Shape base;
  protected Shape shape

  public RoundButton() {
    this(null, null);
  }

  public RoundButton(Icon icon) {
    this(null, icon);
  }

  public RoundButton(String text) {
    this(text, null);
  }

  public RoundButton(Action a) {
    this();
    setAction(a);
  }

  public RoundButton(String text, Icon icon) {
    setModel(new DefaultButtonModel());
    init(text, icon);
    if (icon == null) {
      return;
    }
    setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
    setBackground(Color.BLACK);
    setContentAreaFilled(false);
    setFocusPainted(false);
    // setVerticalAlignment(SwingConstants.TOP);
    setAlignmentY(Component.TOP_ALIGNMENT);
    initShape();
  }

  protected void initShape() {
    if (!getBounds().equals(base)) {
      Dimension s = getPreferredSize();
      base = getBounds();
      shape = new Ellipse2D.Float(0, 0, s.width - 1, s.height - 1);
    }
  }

  @Override public Dimension getPreferredSize() {
    Icon icon = getIcon();
    Insets i = getInsets();
    int iw = Math.max(icon.getIconWidth(), icon.getIconHeight());
    return new Dimension(iw + i.right + i.left, iw + i.top + i.bottom);
  }

  @Override protected void paintBorder(Graphics g) {
    initShape();
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(getBackground());
    // g2.setStroke(new BasicStroke(1f));
    g2.draw(shape);
    g2.dispose();
  }

  @Override public boolean contains(int x, int y) {
    initShape();
    return shape.contains(x, y);
    // Transparent color is 0, making it unclickable:
    // or return super.contains(x, y) && ((image.getRGB(x, y) >> 24) & 0xff) > 0;
  }
}

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