Java Swing Tips: Timer

Showing posts with label Timer. Show all posts

2023/03/31

Create a dot matrix LED digital clock with JList

Code

private static JList<Boolean> makeLedDotMatrixList(
    ListModel<Boolean> model, Dimension dim) {
  return new JList<Boolean>(model) {
    @Override public void updateUI() {
      setFixedCellWidth(dim.width);
      setFixedCellHeight(dim.height);
      setVisibleRowCount(ROW);
      setCellRenderer(null);
      super.updateUI();
      setLayoutOrientation(JList.VERTICAL_WRAP);
      setFocusable(false);
      ListCellRenderer<? super Boolean> renderer = getCellRenderer();
      Icon on = new LedDotIcon(true, dim);
      Icon off = new LedDotIcon(false, dim);
      setCellRenderer((list, value, index, isSelected, cellHasFocus) -> {
        Component c = renderer.getListCellRendererComponent(
            list, null, index, false, false);
        if (c instanceof JLabel) {
          ((JLabel) c).setIcon(Objects.equals(Boolean.TRUE, value) ? on : off);
        }
        return c;
      });
      setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
      setBackground(Color.BLACK);
    }
  };
}

class LedDotIcon implements Icon {
  private final Color on = new Color(0x32_FF_AA);
  private final boolean led;
  private final Dimension dim;

  protected LedDotIcon(boolean led, Dimension dim) {
    this.led = led;
    this.dim = dim;
  }

  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(
        RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    // JList#setLayoutOrientation(VERTICAL_WRAP) + Synth, Nimbus, GTK bug???
    // g2.translate(x, y);
    g2.setPaint(led ? on : c.getBackground());
    g2.fillOval(0, 0, getIconWidth() - 1, getIconHeight() - 1);
    g2.dispose();
  }

  @Override public int getIconWidth() {
    return dim.width;
  }

  @Override public int getIconHeight() {
    return dim.height;
  }
}

DefaultListModel<Boolean> model1 = new DefaultListModel<Boolean>() {
  @Override public Boolean getElementAt(int index) {
    return getHoursMinutesDotMatrix(time, index);
  }
};
model1.setSize((COLUMN * 4 + 5) * ROW);

private static boolean getHoursMinutesDotMatrix(LocalTime time, int index) {
  int ten = 10;
  int hours = time.getHour();
  int h1 = hours / ten;
  int start = 0;
  int end = start + COLUMN;
  if (contains(index, start, end, h1)) {
    return hours >= ten;
  }
  int gap = 1;
  int h2 = hours - h1 * ten;
  start = end + gap;
  end = start + COLUMN;
  if (contains(index, start, end, h2)) {
    return true;
  }
  int seconds = time.getSecond();
  int s1 = seconds / ten;
  int s2 = seconds - s1 * ten;
  start = end + gap;
  end = start + gap;
  if (index < end * ROW && s2 % 2 == 0 && DOT.contains(index - start * ROW)) {
    return true;
  }
  int minutes = time.getMinute();
  int m1 = minutes / ten;
  start = end + gap;
  end = start + COLUMN;
  if (contains(index, start, end, m1)) {
    return true;
  }
  int m2 = minutes - m1 * ten;
  start = end + gap;
  end = start + COLUMN;
  return contains(index, start, end, m2);
}

private static final int COLUMN = 4;
private static final int ROW = 7;
private static final List<Set<Integer>> NUMBERS = Arrays.asList(
  Set.of(0, 1, 2, 3, 4, 5, 6, 7, 13, 14, 20, 21, 22, 23, 24, 25, 26, 27), // 0
  Set.of(21, 22, 23, 24, 25, 26, 27), // 1
  Set.of(0, 3, 4, 5, 6, 7, 10, 13, 14, 17, 20, 21, 22, 23, 24, 27), // 2
  Set.of(0, 3, 6, 7, 10, 13, 14, 17, 20, 21, 22, 23, 24, 25, 26, 27), // 3
  Set.of(0, 1, 2, 3, 10, 17, 21, 22, 23, 24, 25, 26, 27), // 4
  Set.of(0, 1, 2, 3, 6, 7, 10, 13, 14, 17, 20, 21, 24, 25, 26, 27), // 5
  Set.of(0, 1, 2, 3, 4, 5, 6, 7, 10, 13, 14, 17, 20, 21, 24, 25, 26, 27), // 6
  Set.of(0, 1, 2, 3, 7, 14, 21, 22, 23, 24, 25, 26, 27), // 7
  Set.of(0, 1, 2, 3, 4, 5, 6, 7, 10, 13, 14, 17, 20, 21, 22, 23, 24, 25, 26, 27), // 8
  Set.of(0, 1, 2, 3, 6, 7, 10, 13, 14, 17, 20, 21, 22, 23, 24, 25, 26, 27)); // 9

Code(alternative pattern)

private static final int COLUMN = 5;
private static final int ROW = 7;
private static final List> NUMBERS = Arrays.asList(
    Set.of(1, 2, 3, 4, 5, 7, 9, 13, 14, 17, 20, 21, 25, 27, 29, 30, 31, 32, 33), // 0
    Set.of(8, 13, 14, 15, 16, 17, 18, 19, 20, 27), // 1
    Set.of(1, 6, 7, 12, 13, 14, 18, 20, 21, 24, 27, 29, 30, 34), // 2
    Set.of(0, 5, 7, 13, 14, 17, 20, 21, 23, 24, 27, 28, 29, 32, 33), // 3
    Set.of(3, 4, 9, 11, 15, 18, 21, 22, 23, 24, 25, 26, 27, 32), // 4
    Set.of(0, 1, 2, 5, 7, 9, 13, 14, 16, 20, 21, 23, 27, 28, 31, 32, 33), // 5
    Set.of(1, 2, 3, 4, 5, 7, 10, 13, 14, 17, 20, 21, 24, 27, 29, 32, 33), // 6
    Set.of(0, 7, 11, 12, 13, 14, 17, 21, 23, 28, 29), // 7
    Set.of(1, 2, 4, 5, 7, 10, 13, 14, 17, 20, 21, 24, 27, 29, 30, 32, 33), // 8
    Set.of(1, 2, 5, 7, 10, 13, 14, 17, 20, 21, 24, 27, 29, 30, 31, 32, 33)); // 9

References

2023/01/31

Create numbers for a 7-segment digital clock using Path2D

Code

class DigitalNumber {
  private final double isosceles;
  private final double dx;
  private final double dy;
  private final double width;
  private final double height;
  private final Rectangle rect = new Rectangle();
  public static final Color OFF = new Color(0xCC_CC_CC);
  public static final Color ON = Color.DARK_GRAY;
  public static final Color BGC = Color.LIGHT_GRAY;
  private final List<Set<Seg>> numbers = Arrays.asList(
      EnumSet.of(Seg.A, Seg.B, Seg.C, Seg.D, Seg.E, Seg.F),
      EnumSet.of(Seg.B, Seg.C),
      EnumSet.of(Seg.A, Seg.B, Seg.D, Seg.E, Seg.G),
      EnumSet.of(Seg.A, Seg.B, Seg.C, Seg.D, Seg.G),
      EnumSet.of(Seg.B, Seg.C, Seg.F, Seg.G),
      EnumSet.of(Seg.A, Seg.C, Seg.D, Seg.F, Seg.G),
      EnumSet.of(Seg.A, Seg.C, Seg.D, Seg.E, Seg.F, Seg.G),
      EnumSet.of(Seg.A, Seg.B, Seg.C),
      EnumSet.of(Seg.A, Seg.B, Seg.C, Seg.D, Seg.E, Seg.F, Seg.G),
      EnumSet.of(Seg.A, Seg.B, Seg.C, Seg.D, Seg.F, Seg.G));
  private Set<Seg> led = EnumSet.noneOf(Seg.class);

  protected DigitalNumber(double dx, double dy, double isosceles) {
    this.isosceles = isosceles;
    this.dx = dx;
    this.dy = dy;
    this.width = 2d * isosceles;
    this.height = width + isosceles;
    rect.setLocation((int) dx, (int) dy);
    rect.setSize((int) (width + 3 * isosceles), (int) (height * 2));
  }

  public Rectangle getBounds() {
    return rect;
  }

  public void setNumber(int num) {
    led = numbers.get(num);
  }

  public void turnOffNumber() {
    led.clear();
  }

  public void drawNumber(Graphics2D g2) {
    EnumSet.allOf(Seg.class).forEach(s -> {
      g2.setColor(led.contains(s) ? ON : OFF);
      Shape seg = s.getShape(dx, dy, width, height, isosceles);
      g2.fill(seg);
      g2.setColor(BGC);
      g2.draw(seg);
    });
  }
}

enum Seg { A, B, C, D, E, F, G }

References

2021/08/31

Add a JButton to the bottom right inside the JScrollPane to scroll back to the top area of the child component

Code

class ScrollBackToTopLayerUI extends LayerUI<JScrollPane> {
  private static final int GAP = 5;
  private final Container rubberStamp = new JPanel();
  private final Point mousePt = new Point();
  private final JButton button = new JButton(new ScrollBackToTopIcon()) {
    @Override public void updateUI() {
      super.updateUI();
      setBorder(BorderFactory.createEmptyBorder());
      setFocusPainted(false);
      setBorderPainted(false);
      setContentAreaFilled(false);
      setRolloverEnabled(false);
    }
  };
  private final Rectangle buttonRect = new Rectangle(button.getPreferredSize());

  private void updateButtonRect(JScrollPane scroll) {
    JViewport viewport = scroll.getViewport();
    int x = viewport.getX() + viewport.getWidth() - buttonRect.width - GAP;
    int y = viewport.getY() + viewport.getHeight() - buttonRect.height - GAP;
    buttonRect.setLocation(x, y);
  }

  @Override public void paint(Graphics g, JComponent c) {
    super.paint(g, c);
    if (c instanceof JLayer) {
      JScrollPane scroll = (JScrollPane) ((JLayer<?>) c).getView();
      updateButtonRect(scroll);
      if (scroll.getViewport().getViewRect().y > 0) {
        button.getModel().setRollover(buttonRect.contains(mousePt));
        SwingUtilities.paintComponent(g, button, rubberStamp, buttonRect);
      }
    }
  }

  @Override public void installUI(JComponent c) {
    super.installUI(c);
    if (c instanceof JLayer) {
      ((JLayer<?>) c).setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
    }
  }

  @Override public void uninstallUI(JComponent c) {
    if (c instanceof JLayer) {
      ((JLayer<?>) c).setLayerEventMask(0);
    }
    super.uninstallUI(c);
  }

  @Override protected void processMouseEvent(MouseEvent e, JLayer<? extends JScrollPane> l) {
    JScrollPane scroll = l.getView();
    Rectangle r = scroll.getViewport().getViewRect();
    Point p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), scroll);
    mousePt.setLocation(p);
    int id = e.getID();
    if (id == MouseEvent.MOUSE_CLICKED) {
      if (buttonRect.contains(mousePt)) {
        scrollBackToTop(l.getView());
      }
    } else if (id == MouseEvent.MOUSE_PRESSED && r.y > 0 && buttonRect.contains(mousePt)) {
      e.consume();
    }
  }

  @Override protected void processMouseMotionEvent(MouseEvent e, JLayer<? extends JScrollPane> l) {
    Point p = SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), l.getView());
    mousePt.setLocation(p);
    l.repaint(buttonRect);
  }

  private void scrollBackToTop(JScrollPane scroll) {
    JComponent c = (JComponent) scroll.getViewport().getView();
    Rectangle current = scroll.getViewport().getViewRect();
    new Timer(20, e -> {
      Timer animator = (Timer) e.getSource();
      if (0 < current.y && animator.isRunning()) {
        current.y -= Math.max(1, current.y / 2);
        c.scrollRectToVisible(current);
      } else {
        animator.stop();
      }
    }).start();
  }
}

References

Add a JButton to the bottom right inside the JScrollPane to scroll back to the top area of the child component(Japanese)

2014/03/27

Long pressing the JButton to get a JPopupMenu

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)

2008/06/25

Mouse Drag Auto Scrolling

Code

class ViewportDragScrollListener extends MouseAdapter
                                 implements HierarchyListener {
  private static final int SPEED = 4;
  private static final int DELAY = 10;
  private final Cursor dc;
  private final Cursor hc = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
  private final Timer scroller;
  private final JComponent label;
  private Point startPt = new Point();
  private Point move    = new Point();

  public ViewportDragScrollListener(JComponent comp) {
    this.label = comp;
    this.dc = comp.getCursor();
    this.scroller = new Timer(DELAY, new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        Container c = SwingUtilities.getAncestorOfClass(
            JViewport.class, label);
        if (c instanceof JViewport.class) {
          JViewport vport = (JViewport) c;
          Rectangle rect = vport.getViewRect();
          rect.translate(move.x, move.y);
          label.scrollRectToVisible(rect);
        }
      }
    });
  }

  @Override public void hierarchyChanged(HierarchyEvent e) {
    JComponent c = (JComponent) e.getSource();
    if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0
        && !c.isDisplayable()) {
      scroller.stop();
    }
  }

  @Override public void mouseDragged(MouseEvent e) {
    JViewport vport = (JViewport) e.getSource();
    Point pt = e.getPoint();
    int dx = startPt.x - pt.x;
    int dy = startPt.y - pt.y;
    Rectangle rect = vport.getViewRect();
    rect.translate(dx, dy);
    label.scrollRectToVisible(rect);
    move.setLocation(SPEED * dx, SPEED * dy);
    startPt.setLocation(pt);
  }

  @Override public void mousePressed(MouseEvent e) {
    e.getComponent().setCursor(hc); // label.setCursor(hc);
    startPt.setLocation(e.getPoint());
    move.setLocation(0, 0);
    scroller.stop();
  }

  @Override public void mouseReleased(MouseEvent e) {
    e.getComponent().setCursor(dc); // label.setCursor(dc);
    scroller.start();
  }

  @Override public void mouseExited(MouseEvent e) {
    e.getComponent().setCursor(dc); // label.setCursor(dc);
    move.setLocation(0, 0);
    scroller.stop();
  }
}

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2023/03/31

Create a dot matrix LED digital clock with JList

Code

Code(alternative pattern)

References

2023/01/31

Create numbers for a 7-segment digital clock using Path2D

Code

References

2021/08/31

Add a JButton to the bottom right inside the JScrollPane to scroll back to the top area of the child component

Code

References

2014/03/27

Long pressing the JButton to get a JPopupMenu

Code

References

2008/06/25

Mouse Drag Auto Scrolling

Code

References