Java Swing Tips

2013/04/25

Rearrange JToolBar icon by drag and drop

Code

class DragHandler extends MouseAdapter {
  private final JWindow window = new JWindow();
  private Component draggingComponent = null;
  private int index = -1;
  private Component gap = Box.createHorizontalStrut(24);
  private Point startPt = null;
  private int gestureMotionThreshold = DragSource.getDragThreshold();
  public DragHandler() {
    window.setBackground(new Color(0x0, true));
  }

  @Override public void mousePressed(MouseEvent e) {
    JComponent parent = (JComponent) e.getComponent();
    if (parent.getComponentCount() <= 1) {
      startPt = null;
      return;
    }
    startPt = e.getPoint();
  }

  @Override public void mouseDragged(MouseEvent e) {
    Point pt = e.getPoint();
    JComponent parent = (JComponent) e.getComponent();
    if (startPt != null && startPt.distance(pt) > gestureMotionThreshold) {
      startPt = null;
      Component c = parent.getComponentAt(pt);
      index = parent.getComponentZOrder(c);
      if (c == parent || index < 0) {
        return;
      }
      draggingComponent = c;

      parent.remove(draggingComponent);
      parent.add(gap, index);
      parent.revalidate();
      parent.repaint();

      window.add(draggingComponent);
      window.pack();

      Dimension d = draggingComponent.getPreferredSize();
      Point p = new Point(pt.x - d.width / 2, pt.y - d.height / 2);
      SwingUtilities.convertPointToScreen(p, parent);
      window.setLocation(p);
      window.setVisible(true);

      return;
    }
    if (!window.isVisible() || draggingComponent == null) {
      return;
    }

    Dimension d = draggingComponent.getPreferredSize();
    Point p = new Point(pt.x - d.width / 2, pt.y - d.height / 2);
    SwingUtilities.convertPointToScreen(p, parent);
    window.setLocation(p);

    for (int i = 0; i < parent.getComponentCount(); i++) {
      Component c = parent.getComponent(i);
      Rectangle r = c.getBounds();
      Rectangle r1 = new Rectangle(r.x, r.y, r.width / 2, r.height);
      Rectangle r2 = new Rectangle(r.x + r.width / 2, r.y, r.width / 2, r.height);
      if (r1.contains(pt)) {
        if (c == gap) {
          return;
        }
        int n = i - 1 >= 0 ? i : 0;
        parent.remove(gap);
        parent.add(gap, n);
        parent.revalidate();
        parent.repaint();
        return;
      } else if (r2.contains(pt)) {
        if (c == gap) {
          return;
        }
        parent.remove(gap);
        parent.add(gap, i);
        parent.revalidate();
        parent.repaint();
        return;
      }
    }
    parent.remove(gap);
    parent.revalidate();
    parent.repaint();
  }

  @Override public void mouseReleased(MouseEvent e) {
    startPt = null;
    if (!window.isVisible() || draggingComponent == null) {
      return;
    }
    Point pt = e.getPoint();
    JComponent parent = (JComponent) e.getComponent();

    Component cmp = draggingComponent;
    draggingComponent = null;
    window.setVisible(false);

    for (int i = 0; i < parent.getComponentCount(); i++) {
      Component c = parent.getComponent(i);
      Rectangle r = c.getBounds();
      Rectangle r1 = new Rectangle(r.x, r.y, r.width / 2, r.height);
      Rectangle r2 = new Rectangle(r.x + r.width / 2, r.y, r.width / 2, r.height);
      if (r1.contains(pt)) {
        int n = i - 1 >= 0 ? i : 0;
        parent.remove(gap);
        parent.add(cmp, n);
        parent.revalidate();
        parent.repaint();
        return;
      } else if (r2.contains(pt)) {
        parent.remove(gap);
        parent.add(cmp, i);
        parent.revalidate();
        parent.repaint();
        return;
      }
    }
    if (parent.getBounds().contains(pt)) {
      parent.remove(gap);
      parent.add(cmp);
    } else {
      parent.remove(gap);
      parent.add(cmp, index);
    }
    parent.revalidate();
    parent.repaint();
  }
}

References

Rearrange JToolBar icon by drag and drop(Japanese)

2013/03/30

JTree node edit only from JPopupMenu

Code

tree.setCellEditor(new DefaultTreeCellEditor(
    tree, (DefaultTreeCellRenderer) tree.getCellRenderer()) {
  @Override public boolean isCellEditable(EventObject e) {
    return !(e instanceof MouseEvent) && super.isCellEditable(e);
  }

  // @Override protected boolean canEditImmediately(EventObject e) {
  //   // ((MouseEvent) e).getClickCount() > 2
  //   return (e instanceof MouseEvent) ? false : super.canEditImmediately(e);
  // }
});
tree.setEditable(true);
tree.setComponentPopupMenu(new TreePopupMenu());

// ...
public TreePopupMenu() {
  super();
  add(new JMenuItem(new AbstractAction("Edit") {
    @Override public void actionPerformed(ActionEvent e) {
      JTree tree = (JTree) getInvoker();
      if (path != null) {
        tree.startEditingAtPath(path);
      }
    }
  }));
  add(new JMenuItem(new AbstractAction("Edit Dialog") {
    @Override public void actionPerformed(ActionEvent e) {
      JTree tree = (JTree) getInvoker();
      if (path == null) {
        return;
      }
      Object node = path.getLastPathComponent();
      if (node instanceof DefaultMutableTreeNode) {
        DefaultMutableTreeNode leaf = (DefaultMutableTreeNode) node;
        textField.setText(leaf.getUserObject().toString());
        int result = JOptionPane.showConfirmDialog(
            tree, textField, "Rename",
            JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
        if (result == JOptionPane.OK_OPTION) {
          String str = textField.getText();
          if (!str.trim().isEmpty()) {
            ((DefaultTreeModel) tree.getModel()).valueForPathChanged(path, str);
          }
        }
      }
    }
  }));
  // ...

References

JTree node edit only from JPopupMenu(Japanese)

2013/02/26

Get SVG from PathIterator

Code

private StringBuilder makeStarburstSvg(PathIterator pi, int sz, String style, String desc) {
  StringBuilder sb = new StringBuilder();
  sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
  //...
  sb.append(String.format("<svg width=\"%d\" height=\"%d\" xmlns=\"%s\">%n", sz, sz, w3));
  sb.append(String.format("  <desc>%s</desc>%n", desc));
  sb.append("  <path d=\"");
  double[] c = new double[6];
  while(!pi.isDone()) {
    switch(pi.currentSegment(c)) {
      case PathIterator.SEG_MOVETO:
        sb.append(String.format("M%.2f,%.2f ", c[0], c[1])); break;
      case PathIterator.SEG_LINETO:
        sb.append(String.format("L%.2f,%.2f ", c[0], c[1])); break;
      case PathIterator.SEG_QUADTO:
        sb.append(String.format("Q%.2f,%.2f,%.2f,%.2f ",c[0],c[1],c[2],c[3]));
        break;
      case PathIterator.SEG_CUBICTO:
        sb.append(String.format("C%.2f,%.2f,%.2f,%.2f,%.2f,%.2f ",c[0],c[1],c[2],c[3],c[4],c[5]));
        break;
      case PathIterator.SEG_CLOSE:
        sb.append("Z"); break;
    }
    pi.next();
  }
  sb.append(String.format("\" style=\"%s\" />%n</svg>%n", style));
  return sb;
}

References

Get SVG from PathIterator(Japanese)

2013/01/28

JScrollBar search highlighter

Code

Override WindowsScrollBarUI#paintTrack(...)

scrollbar.setUI(new WindowsScrollBarUI() {
  @Override protected void paintTrack(
      Graphics g, JComponent c, Rectangle trackBounds) {
    super.paintTrack(g, c, trackBounds);

    Rectangle rect = textArea.getBounds();
    double sy = trackBounds.getHeight() / rect.getHeight();
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();
    g.setColor(Color.YELLOW);
    try {
      for (Highlighter.Highlight hh : highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; // Math.max(2, s.height - 2);
        g.fillRect(trackBounds.x, trackBounds.y + s.y, trackBounds.width, h);
      }
    }catch (BadLocationException ex) {
      ex.printStackTrace();
    }
  }
});

JLabel + Icon + RowHeader

Code

final JScrollPane scroll = new JScrollPane(textArea);
JLabel label = new JLabel(new Icon() {
  private final Color THUMB_COLOR = new Color(0, 0, 255, 50);
  private final Rectangle thumbRect = new Rectangle();
  private final JTextComponent textArea;
  private final JScrollBar scrollbar;

  public HighlightIcon(JTextComponent textArea, JScrollBar scrollbar) {
    this.textArea = textArea;
    this.scrollbar = scrollbar;
  }

  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    // Rectangle rect   = textArea.getBounds();
    // Dimension sbSize = scrollbar.getSize();
    // Insets sbInsets  = scrollbar.getInsets();
    // double sy = (sbSize.height - sbInsets.top - sbInsets.bottom) / rect.getHeight();
    int itop = scrollbar.getInsets().top;
    BoundedRangeModel range = scrollbar.getModel();
    double sy = range.getExtent() / (double) (range.getMaximum() - range.getMinimum());
    AffineTransform at = AffineTransform.getScaleInstance(1.0, sy);
    Highlighter highlighter = textArea.getHighlighter();

    // paint Highlight
    g.setColor(Color.RED);
    try {
      for (Highlighter.Highlight hh: highlighter.getHighlights()) {
        Rectangle r = textArea.modelToView(hh.getStartOffset());
        Rectangle s = at.createTransformedShape(r).getBounds();
        int h = 2; // Math.max(2, s.height - 2);
        g.fillRect(x, y + itop + s.y, getIconWidth(), h);
      }
    } catch (BadLocationException e) {
      e.printStackTrace();
    }

    // paint Thumb
    if (scrollbar.isVisible()) {
      // JViewport vport = Objects.requireNonNull(
      //   (JViewport) SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
      // Rectangle thumbRect = vport.getBounds();
      thumbRect.height = range.getExtent();
      thumbRect.y = range.getValue(); // vport.getViewPosition().y;
      g.setColor(THUMB_COLOR);
      Rectangle s = at.createTransformedShape(thumbRect).getBounds();
      g.fillRect(x, y + itop + s.y, getIconWidth(), s.height);
    }
  }

  @Override public int getIconWidth() {
    return 8;
  }

  @Override public int getIconHeight() {
    JViewport vport = Objects.requireNonNull(
      (JViewport) SwingUtilities.getAncestorOfClass(JViewport.class, textArea));
    return vport.getHeight();
  }
});

scroll.setVerticalScrollBar(scrollbar);
/*
// Fixed Versions: 7 (b134)
scroll.setRowHeaderView(label);
/*/
// 6826074 JScrollPane does not revalidate the component hierarchy after scrolling
// https://bugs.openjdk.org/browse/JDK-6826074
// Affected Versions: 6u12,6u16,7
JViewport vp = new JViewport() {
  @Override public void setViewPosition(Point p) {
    super.setViewPosition(p);
    revalidate();
  }
};
vp.setView(label);
scroll.setRowHeader(vp);

MatteBorder + Icon + RowHeader

Code

JScrollBar scrollBar = new JScrollBar(Adjustable.VERTICAL) {
  @Override public Dimension getPreferredSize() {
    Dimension d = super.getPreferredSize();
    d.width += getInsets().left;
    return d;
  }

  @Override public void updateUI() {
    super.updateUI();
    setBorder(BorderFactory.createMatteBorder(0, 4, 0, 0, new Icon() {
      @Override public void paintIcon(Component c, Graphics g, int x, int y) {
        // ...
      }

      @Override public int getIconWidth() {
        return getInsets().left;
      }

      @Override public int getIconHeight() {
        return getHeight();
      }
    }));
  }
};
scroll.setVerticalScrollBar(scrollBar);

References

JScrollBar search highlighter(Japanese)

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());
    }
  };
}

Google Tag Manager

2013/04/25

Rearrange JToolBar icon by drag and drop

Code

References

2013/03/30

JTree node edit only from JPopupMenu

Code

References

2013/02/26

Get SVG from PathIterator

Code

References

2013/01/28

JScrollBar search highlighter

Code

Override WindowsScrollBarUI#paintTrack(...)

JLabel + Icon + RowHeader

Code

MatteBorder + Icon + RowHeader

Code

References

2013/01/08

make a translucent JButton

Code

References