Change the indeterminate JProgressBar animation patterns

• download example.jar
• download src.zip
• repository

Code

class StripedProgressBarUI extends BasicProgressBarUI {
  private final boolean dir;
  private final boolean slope;
  public StripedProgressBarUI(boolean dir, boolean slope) {
    super();
    this.dir = dir;
    this.slope = slope;
  }
  @Override protected int getBoxLength(int availableLength, int otherDimension) {
    return availableLength; //(int) Math.round(availableLength / 6d);
  }
  @Override public void paintIndeterminate(Graphics g, JComponent c) {
    if (!(g instanceof Graphics2D)) {
      return;
    }

    Insets b = progressBar.getInsets(); // area for border
    int barRectWidth  = progressBar.getWidth() - b.right - b.left;
    int barRectHeight = progressBar.getHeight() - b.top - b.bottom;

    if (barRectWidth <= 0 || barRectHeight <= 0) {
      return;
    }

    Graphics2D g2 = (Graphics2D) g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);

    // Paint the striped box.
    boxRect = getBox(boxRect);
    if (boxRect != null) {
      int w = 10;
      int x = getAnimationIndex();
      GeneralPath p = new GeneralPath();
      if (dir) {
        p.moveTo(boxRect.x,           boxRect.y);
        p.lineTo(boxRect.x + w * .5f, boxRect.y + boxRect.height);
        p.lineTo(boxRect.x + w,       boxRect.y + boxRect.height);
        p.lineTo(boxRect.x + w * .5f, boxRect.y);
      } else {
        p.moveTo(boxRect.x,           boxRect.y + boxRect.height);
        p.lineTo(boxRect.x + w * .5f, boxRect.y + boxRect.height);
        p.lineTo(boxRect.x + w,       boxRect.y);
        p.lineTo(boxRect.x + w * .5f, boxRect.y);
      }
      p.closePath();
      g2.setColor(progressBar.getForeground());
      if (slope) {
        for (int i = boxRect.width + x; i > -w; i -= w) {
          g2.fill(AffineTransform.getTranslateInstance(i, 0).createTransformedShape(p));
        }
      } else {
        for (int i = -x; i < boxRect.width; i += w) {
          g2.fill(AffineTransform.getTranslateInstance(i, 0).createTransformedShape(p));
        }
      }
    }
  }
}

References

• Change the indeterminate JProgressBar animation patterns(Japanese)

Create a custom drag ghost image

• download example.jar
• download src.zip
• repository

Code

class ListItemTransferHandler extends TransferHandler {
  @Override public int getSourceActions(JComponent c) {
    System.out.println("getSourceActions");
    if (!(c instanceof JList)) {
      return NONE;
    }
    JList source = (JList) c;
    Point pt;
    if (compact) {
      int w = source.getFixedCellWidth();
      int h = source.getFixedCellHeight() - 20; //TODO
      setDragImage(createCompactDragImage(source, w, h));
      pt = new Point(w / 2, h);
    } else {
      setDragImage(createDragImage(source));
      pt = c.getMousePosition();
    }
    if (pt != null) {
      setDragImageOffset(pt);
    }
    return MOVE; //TransferHandler.COPY_OR_MOVE;
  }
  private static BufferedImage createDragImage(JList source) {
    int w = source.getWidth();
    int h = source.getHeight();
    BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
    Graphics g = bi.getGraphics();
    DefaultListCellRenderer renderer =
      (DefaultListCellRenderer) source.getCellRenderer();
    for (int i : source.getSelectedIndices()) {
      Component c = renderer.getListCellRendererComponent(
          source, source.getModel().getElementAt(i), i, false, false);
      Rectangle rect = source.getCellBounds(i, i);
      SwingUtilities.paintComponent(g, c, source, rect);
    }
    g.dispose();
    return bi;
  }
  private BufferedImage createCompactDragImage(JList source, int w, int h) {
    BufferedImage br = null;
    if (w > 0 && h > 0) {
      br = source.getGraphicsConfiguration().createCompatibleImage(
          w, h, Transparency.TRANSLUCENT);
    } else {
      return null;
    }
    int[] selectedIndices = source.getSelectedIndices();
    int length = selectedIndices.length;
    Graphics g = br.getGraphics();
    DefaultListCellRenderer renderer =
      (DefaultListCellRenderer) source.getCellRenderer();
    int idx = selectedIndices[0];
    Object valueAt = source.getModel().getElementAt(idx);
    Component c = renderer.getListCellRendererComponent(
        source, valueAt, idx, false, false);
    Rectangle rect = source.getCellBounds(idx, idx);
    SwingUtilities.paintComponent(g, c, source, 0, 0, rect.width, rect.height);
    if (length > 1) {
      LABEL.setText(String.valueOf(length));
      Dimension d = LABEL.getPreferredSize();
      SwingUtilities.paintComponent(
          g, LABEL, source, (w - d.width) / 2, (h - d.height) / 2, d.width, d.height);
    }
    g.dispose();
    br.coerceData(true);
    return br;
  }
//...

References

• Create a custom drag ghost image(Japanese)