Java Swing Tips

2009/08/12

JMenuBar Background Image

Code

public JMenuBar createMenubar() {
  final TexturePaint texture = makeTexturePaint();
  JMenuBar mb = new JMenuBar() {
    @Override protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D) g.create();
      g2.setPaint(texture);
      g2.fillRect(0, 0, getWidth(), getHeight());
      g2.dispose();
    }
  };
  mb.setOpaque(false);
  String[] menuKeys = {"File", "Edit", "Help"};
  for (String key: menuKeys) {
    JMenu m = createMenu(key);
    if (m != null) {
      mb.add(m);
    }
  }
  return mb;
}

private JMenu createMenu(String key) {
  JMenu menu = new JMenu(key) {
    @Override protected void fireStateChanged() {
      ButtonModel m = getModel();
      if (m.isPressed() && m.isArmed()) {
        setOpaque(true);
      } else if (m.isSelected()) {
        setOpaque(true);
      } else if (isRolloverEnabled() && m.isRollover()) {
        setOpaque(true);
      } else {
        setOpaque(false);
      }
      super.fireStateChanged();
    };
  };
  if ("Windows XP".equals(System.getProperty("os.name"))) {
    menu.setBackground(new Color(0x0, true)); // XXX: Windows XP lnf?
  }
  menu.add("JMenuItem1");
  menu.add("JMenuItem2");
  menu.add("JMenuItem3");
  return menu;
}

References

JMenuBar Background Image(Japanese)

2009/06/26

Disable Right Click In JComboBox-Dropdown-List

Code

class BasicComboPopup2 extends BasicComboPopup {
  private transient Handler2 handler2;

  public BasicComboPopup2(JComboBox combo) {
    super(combo);
  }

  @Override public void uninstallingUI() {
    super.uninstallingUI();
    handler2 = null;
  }

  @Override protected MouseListener createListMouseListener() {
    if (handler2 == null) {
      handler2 = new Handler2();
    }
    return handler2;
  }

  private class Handler2 extends MouseAdapter {
    @Override public void mouseReleased(MouseEvent e) {
      if (e.getSource().equals(list)) {
        if (list.getModel().getSize() > 0) {
          // <ins>
          if (!SwingUtilities.isLeftMouseButton(e) ||
              !comboBox.isEnabled()) {
            return;
          }
          // </ins>
          // JList mouse listener
          if (comboBox.getSelectedIndex() == list.getSelectedIndex()) {
            comboBox.getEditor().setItem(list.getSelectedValue());
          }
          comboBox.setSelectedIndex(list.getSelectedIndex());
        }
        comboBox.setPopupVisible(false);
        // workaround for cancelling an edited item (bug 4530953)
        if (comboBox.isEditable() && comboBox.getEditor() != null) {
          comboBox.configureEditor(
              comboBox.getEditor(), comboBox.getSelectedItem());
        }
      }
    }
  }
}

References

Disable Right Click In JComboBox-Dropdown-List(Japanese)

2009/06/10

New Tab Button

Code

class TabLayout implements LayoutManager, Serializable {
  private static final long serialVersionUID = 1L;
  private static final int TAB_WIDTH = 100;
  @Override public void addLayoutComponent(String name, Component comp) {
    /* not needed */
  }

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

  @Override public Dimension preferredLayoutSize(Container parent) {
    synchronized (parent.getTreeLock()) {
      Insets insets = parent.getInsets();
      int last = parent.getComponentCount() - 1;
      int w = 0;
      int h = 0;
      if (last >= 0) {
        Component comp = parent.getComponent(last);
        Dimension d = comp.getPreferredSize();
        w = d.width;
        h = d.height;
      }
      return new Dimension(insets.left + insets.right + w,
                           insets.top + insets.bottom + h);
    }
  }

  @Override public Dimension minimumLayoutSize(Container parent) {
    synchronized (parent.getTreeLock()) {
      return new Dimension(100, 24);
    }
  }

  @Override public void layoutContainer(Container parent) {
    synchronized (parent.getTreeLock()) {
      int ncomponents = parent.getComponentCount();
      if (ncomponents == 0) {
        return;
      }
      // int nrows = 1;
      // boolean ltr = parent.getComponentOrientation().isLeftToRight();
      Insets insets = parent.getInsets();
      int ncols = ncomponents - 1;
      int lastw = parent.getComponent(ncomponents - 1).getPreferredSize().width;
      int width = parent.getWidth() - insets.left - insets.right - lastw;
      int h = parent.getHeight() - insets.top - insets.bottom;
      int w = width > TAB_WIDTH * ncols ? TAB_WIDTH : width / ncols;
      int gap = width - w * ncols;
      int x = insets.left;
      int y = insets.top;
      for (int i = 0; i < ncomponents; i++) {
        int cw = i == ncols ? lastw : w + (gap-- > 0 ? 1 : 0);
        parent.getComponent(i).setBounds(x, y, cw, h);
        x += cw;
      }
    }
  }

  @Override public String toString() {
    return getClass().getName();
  }
}

References

2009/06/03

Color JComboBox

Code

combo01.setModel(makeModel());
combo01.setRenderer(new MyListCellRenderer(combo01.getRenderer()));
combo01.addItemListener(new ItemListener() {
  public void itemStateChanged(ItemEvent e) {
    if(e.getStateChange()!=ItemEvent.SELECTED) return;
    combo01.setBackground(getOEColor(combo01.getSelectedIndex()));
  }
});
combo01.setSelectedIndex(0);
combo01.setBackground(evenBGColor);

final JTextField field = (JTextField) combo02.getEditor().getEditorComponent();
field.setOpaque(true);
field.setBackground(evenBGColor);
combo02.setEditable(true);
combo02.setModel(makeModel());
combo02.setRenderer(new MyListCellRenderer(combo02.getRenderer()));
combo02.addItemListener(new ItemListener() {
  public void itemStateChanged(ItemEvent e) {
    if(e.getStateChange()!=ItemEvent.SELECTED) return;
    field.setBackground(getOEColor(combo02.getSelectedIndex()));
  }
});
combo02.setSelectedIndex(0);

References

Color JComboBox(Japanese)

2009/05/19

Left Clipped JComboBox

Code

final JButton arrowButton = getArrowButton(combo02);
combo02.setRenderer(new DefaultListCellRenderer() {
  @Override public Component getListCellRendererComponent(
    JList list, Object value, int index,
    boolean isSelected, boolean cellHasFocus) {
    super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
    int itb = 0, ilr = 0;
    Insets insets = getInsets();
    itb += insets.top + insets.bottom;
    ilr += insets.left + insets.right;
    insets = combo02.getInsets();
    itb += insets.top + insets.bottom;
    ilr += insets.left + insets.right;
    int availableWidth = combo02.getWidth() - ilr;
    if (index < 0) {
      // @see BasicComboBoxUI#rectangleForCurrentValue
      int buttonSize = combo02.getHeight() - itb;
      if (arrowButton != null) {
        buttonSize = arrowButton.getWidth();
      }
      availableWidth -= buttonSize;
      JTextField tf = (JTextField) combo02.getEditor().getEditorComponent();
      insets = tf.getMargin();
      availableWidth -= (insets.left + insets.right);
    }
    String cellText = (value != null) ? value.toString() : "";
    // <blockquote cite="https://tips4java.wordpress.com/2008/11/12/left-dot-renderer/">
    // @title Left Dot Renderer
    // @auther Rob Camick
    FontMetrics fm = getFontMetrics(getFont());
    if (fm.stringWidth(cellText) > availableWidth) {
      String dots = "...";
      int textWidth = fm.stringWidth(dots);
      int nChars = cellText.length() - 1;
      while (nChars > 0) {
        textWidth += fm.charWidth(cellText.charAt(nChars));
        if (textWidth > availableWidth) break;
        nChars--;
      }
      setText(dots + cellText.substring(nChars + 1));
    }
    // </blockquote>
    return this;
  }
});

Google Tag Manager

2009/08/12

JMenuBar Background Image

Code

References

2009/06/26

Disable Right Click In JComboBox-Dropdown-List

Code

References

2009/06/10

New Tab Button

Code

References

2009/06/03

Color JComboBox

Code

References

2009/05/19

Left Clipped JComboBox

Code

References