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)

Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit

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

Code

class DocumentFilterUndoManager extends UndoManager {
  private CompoundEdit compoundEdit;
  public final DocumentFilter undoFilter = new DocumentFilter() {
    @Override public void replace(
        DocumentFilter.FilterBypass fb,
        int offset, int length, String text,
        AttributeSet attrs) throws BadLocationException {
      if (length == 0) {
        fb.insertString(offset, text, attrs);
      } else {
        compoundEdit = new CompoundEdit();
        fb.replace(offset, length, text, attrs);
        compoundEdit.end();
        addEdit(compoundEdit);
        compoundEdit = null;
      }
    }
  };
  @Override public void undoableEditHappened(UndoableEditEvent e) {
    if (compoundEdit == null) {
      addEdit(e.getEdit());
    } else {
      compoundEdit.addEdit(e.getEdit());
    }
  }
}

References

• Merge the ReplaceEdit(remove and insertString edit) into a single CompoundEdit(Japanese)

How to create a circular progress component

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

Code

class ProgressCircleUI extends BasicProgressBarUI {
  @Override public Dimension getPreferredSize(JComponent c) {
    Dimension d = super.getPreferredSize(c);
    int v = Math.max(d.width, d.height);
    d.setSize(v, v);
    return d;
  }

  @Override public void paint(Graphics g, JComponent c) {
    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;
    }

    // draw the cells
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    double degree = 360 * progressBar.getPercentComplete();
    double sz = Math.min(barRectWidth, barRectHeight);
    double cx = b.left + barRectWidth  * .5;
    double cy = b.top  + barRectHeight * .5;
    double or = sz * .5;
    double ir = or * .5; //or - 20;
    Shape inner  = new Ellipse2D.Double(cx - ir, cy - ir, ir * 2, ir * 2);
    Shape outer  = new Ellipse2D.Double(cx - or, cy - or, sz, sz);
    Shape sector = new Arc2D.Double(
        cx - or, cy - or, sz, sz, 90 - degree, degree, Arc2D.PIE);

    Area foreground = new Area(sector);
    Area background = new Area(outer);
    Area hole = new Area(inner);

    foreground.subtract(hole);
    background.subtract(hole);

    g2.setPaint(new Color(0xDDDDDD));
    g2.fill(background);

    g2.setPaint(progressBar.getForeground());
    g2.fill(foreground);
    g2.dispose();

    // Deal with possible text painting
    if (progressBar.isStringPainted()) {
      paintString(g, b.left, b.top, barRectWidth, barRectHeight, 0, b);
    }
  }
}

// ...
JProgressBar progress = new JProgressBar();
progress.setUI(new ProgressCircleUI());
progress.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
progress.setStringPainted(true);
progress.setFont(progress.getFont().deriveFont(24f));
progress.setForeground(Color.ORANGE);

(new Timer(50, e -> {
  int iv = Math.min(100, progress.getValue() + 1);
  progress.setValue(iv);
})).start();

References

• How to create a circular progress component(Japanese)

JProgressBar in JTable cell render a progress string

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

Code

class Task extends SwingWorker<Integer, ProgressValue> {
  private final int lengthOfTask;
  private final int randomSleep = new Random().nextInt(100) + 1;
  public Task(int lengthOfTask) {
    super();
    this.lengthOfTask = lengthOfTask;
  }

  @Override protected Integer doInBackground() {
    int current = 0;
    while (current < lengthOfTask && !isCancelled()) {
      current++;
      try {
        Thread.sleep(randomSleep);
      } catch (InterruptedException ie) {
        break;
      }
      publish(new ProgressValue(lengthOfTask, current));
    }
    return randomSleep * lengthOfTask;
  }
}

class ProgressValue {
  private final Integer progress;
  private final Integer lengthOfTask;
  public ProgressValue(Integer lengthOfTask, Integer progress) {
    this.progress = progress;
    this.lengthOfTask = lengthOfTask;
  }

  public Integer getProgress() {
    return progress;
  }

  public Integer getLengthOfTask() {
    return lengthOfTask;
  }
}

class ProgressRenderer extends DefaultTableCellRenderer {
  private final JProgressBar progress = new JProgressBar();
  private final JPanel renderer = new JPanel(new BorderLayout());
  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected, boolean hasFocus,
      int row, int column) {
    Component c;
    renderer.removeAll();
    progress.setValue(0);
    if (value instanceof ProgressValue) {
      ProgressValue pv = (ProgressValue) value;
      Integer current = pv.getProgress();
      Integer lengthOfTask = pv.getLengthOfTask();
      if (current < 0) {
        c = super.getTableCellRendererComponent(
            table, "Canceled", isSelected, hasFocus, row, column);
      } else if (current < lengthOfTask) {
        progress.setValue(current * 100 / lengthOfTask);
        progress.setStringPainted(true);
        progress.setString(String.format("%d/%d", current, lengthOfTask));
        renderer.add(progress);
        c = renderer;
      } else {
        c = super.getTableCellRendererComponent(
                table, "Done", isSelected, hasFocus, row, column);
      }
    } else {
      c = super.getTableCellRendererComponent(
              table, "Waiting...", isSelected, hasFocus, row, column);
    }
    return c;
  }

  @Override public void updateUI() {
    super.updateUI();
    setOpaque(true);
    if (Objects.nonNull(renderer)) {
      SwingUtilities.updateComponentTreeUI(renderer);
    }
  }
}

References

• JProgressBar in JTable cell render a progress string(Japanese)
• Java Swing Tips: JProgressBar in JTable Cell

Long pressing the JButton to get a JPopupMenu

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

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)