Filtering JList items by Regex

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

Code

DefaultListModel<ListItem> model = new DefaultListModel<>();
JList<ListItem> list = new JList<ListItem>(model) {
  @Override public void updateUI() {
    setSelectionForeground(null);
    setSelectionBackground(null);
    setCellRenderer(null);
    super.updateUI();
    setLayoutOrientation(JList.HORIZONTAL_WRAP);
    setVisibleRowCount(0);
    setFixedCellWidth(82);
    setFixedCellHeight(64);
    setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));
    setCellRenderer(new ListItemListCellRenderer<ListItem>());
    getSelectionModel().setSelectionMode(
        ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
  }
};
private Optional<Pattern> getPattern() {
  try {
    return Optional.ofNullable(field.getText())
                   .filter(s -> !s.isEmpty())
                   .map(Pattern::compile);
  } catch (PatternSyntaxException ex) {
    return Optional.empty();
  }
}
private void filter() {
  getPattern().ifPresent(pattern -> {
    List<ListItem> selected = list.getSelectedValuesList();
    model.clear();
    Stream.of(defaultModel)
          .filter(item -> pattern.matcher(item.title).find())
          .forEach(model::addElement);
    for (ListItem item : selected) {
      int i = model.indexOf(item);
      list.addSelectionInterval(i, i);
    }
  });
}

References

• Filtering JList items by Regex(Japanese)

Highlight all search pattern matches in the JTextArea

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

Code

private Pattern getPattern() {
  String text = field.getText();
  if (text == null || text.isEmpty()) {
    return null;
  }
  try {
    String cw = checkWord.isSelected() ? "\\b" : "";
    String pattern = String.format("%s%s%s", cw, text, cw);
    int flags = checkCase.isSelected()
      ? 0
      : Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE;
    return Pattern.compile(pattern, flags);
  } catch (PatternSyntaxException ex) {
    field.setBackground(WARNING_COLOR);
    return null;
  }
}

private void changeHighlight() {
  field.setBackground(Color.WHITE);
  Highlighter highlighter = textArea.getHighlighter();
  highlighter.removeAllHighlights();
  Document doc = textArea.getDocument();
  try {
    Pattern pattern = getPattern();
    if (pattern != null) {
      Matcher matcher = pattern.matcher(doc.getText(0, doc.getLength()));
      int pos = 0;
      while (matcher.find(pos)) {
        int start = matcher.start();
        int end   = matcher.end();
        highlighter.addHighlight(start, end, highlightPainter);
        pos = end;
      }
    }
    JLabel label = layerUI.hint;
    Highlighter.Highlight[] array = highlighter.getHighlights();
    int hits = array.length;
    if (hits == 0) {
      current = -1;
      label.setOpaque(true);
    } else {
      current = (current + hits) % hits;
      label.setOpaque(false);
      Highlighter.Highlight hh = highlighter.getHighlights()[current];
      highlighter.removeHighlight(hh);
      highlighter.addHighlight(
          hh.getStartOffset(), hh.getEndOffset(), currentPainter);
      scrollToCenter(textArea, hh.getStartOffset());
    }
    label.setText(String.format("%02d / %02d%n", current + 1, hits));
  } catch (BadLocationException e) {
    e.printStackTrace();
  }
  field.repaint();
}

References

• Highlight all search pattern matches in the JTextArea(Japanese)

JTable highlighting and filtering with regular expression

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

Code

class HighlightTableCellRenderer
    extends JTextField implements TableCellRenderer {
  private static final Color BGC= new Color(220, 240, 255);
  private final transient Highlighter.HighlightPainter highlightPainter
    = new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW);
  private String pattern = "";
  private String prev;

  public boolean setPattern(String str) {
    if (str == null || str.equals(pattern)) {
      return false;
    } else {
      prev = pattern;
      pattern = str;
      return true;
    }
  }

  public HighlightTableCellRenderer() {
    super();
    setOpaque(true);
    setBorder(BorderFactory.createEmptyBorder());
    setForeground(Color.BLACK);
    setBackground(Color.WHITE);
    setEditable(false);
  }

  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected,
      boolean hasFocus, int row, int column) {
    String txt = Objects.toString(value, "");
    Highlighter highlighter = getHighlighter();
    highlighter.removeAllHighlights();
    setText(txt);
    setBackground(isSelected ? BGC : Color.WHITE);
    if (pattern != null && !pattern.isEmpty() && !pattern.equals(prev)) {
      Matcher matcher = Pattern.compile(pattern).matcher(txt);
      int pos = 0;
      while (matcher.find(pos) && !matcher.group().isEmpty()) {
        int start = matcher.start();
        int end   = matcher.end();
        try {
          highlighter.addHighlight(start, end, highlightPainter);
        } catch (BadLocationException | PatternSyntaxException e) {
          e.printStackTrace();
        }
        pos = end;
      }
    }
    return this;
  }
}

References

• JTable highlighting and filtering with regular expression(Japanese)

JScrollBar search highlighter

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

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)