Disable the arrow button when the knob position of the JScrollBar is on the boundary

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

Code

// UIManager.put("ScrollBar.alwaysShowThumb", Boolean.TRUE);
JScrollPane scroll = new JScrollPane(new JTable(24, 3));
scroll.getVerticalScrollBar().addAdjustmentListener(e -> {
  JScrollBar scrollBar = (JScrollBar) e.getAdjustable();
  BoundedRangeModel m = scrollBar.getModel();
  int value = m.getValue();
  boolean max = value == m.getMaximum() - m.getExtent();
  Optional.ofNullable(scrollBar.getComponent(0))
      .ifPresent(b -> b.setEnabled(!max));
  boolean min = value == m.getMinimum();
  Optional.ofNullable(scrollBar.getComponent(1))
      .ifPresent(b -> b.setEnabled(!min));
});

References

• Disable the arrow button when the knob position of the JScrollBar is on the boundary(Japanese)

Paint the major tick marks inside the JSlider track and the current value inside the knob

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

Code

JSlider slider = new JSlider();
slider.setSnapToTicks(true);
slider.setMajorTickSpacing(10);
slider.addMouseMotionListener(new MouseAdapter() {
  @Override public void mouseDragged(MouseEvent e) {
    super.mouseDragged(e);
    e.getComponent().repaint();
  }
});

UIDefaults d = new UIDefaults();
d.put("Slider.thumbWidth", 24);
d.put("Slider.thumbHeight", 24);
Painter<JSlider> thumbPainter = (g, c, w, h) -> {
  g.setPaint(new Color(0x21_98_F6));
  g.fillOval(0, 0, w, h);
  NumberIcon icon = new NumberIcon(c.getValue());
  int xx = (w - icon.getIconWidth()) / 2;
  int yy = (h - icon.getIconHeight()) / 2;
  icon.paintIcon(c, g, xx, yy);
};
d.put("Slider:SliderThumb[Disabled].backgroundPainter", thumbPainter);
d.put("Slider:SliderThumb[Enabled].backgroundPainter", thumbPainter);
d.put("Slider:SliderThumb[Focused+MouseOver].backgroundPainter", thumbPainter);
d.put("Slider:SliderThumb[Focused+Pressed].backgroundPainter", thumbPainter);
d.put("Slider:SliderThumb[Focused].backgroundPainter", thumbPainter);
d.put("Slider:SliderThumb[MouseOver].backgroundPainter", thumbPainter);
d.put("Slider:SliderThumb[Pressed].backgroundPainter", thumbPainter);

d.put("Slider:SliderTrack[Enabled].backgroundPainter", new Painter<JSlider>() {
  @Override public void paint(Graphics2D g, JSlider c, int w, int h) {
    int arc = 10;
    int thumbSize = 24;
    int trackHeight = 8;
    int tickSize = 4;
    int trackWidth = w - thumbSize;
    int fillTop = (thumbSize - trackHeight) / 2;
    int fillLeft = thumbSize / 2;

    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g.setColor(new Color(0xC6_E4_FC));
    g.fillRoundRect(fillLeft, fillTop + 2, trackWidth, trackHeight - 4, arc, arc);

    // Paint track
    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g.setColor(new Color(0xC6_E4_FC));
    g.fillRoundRect(fillLeft, fillTop + 2, trackWidth, trackHeight - 4, arc, arc);

    int fillBottom = fillTop + trackHeight;
    Rectangle r = new Rectangle(fillLeft, fillTop, trackWidth, fillBottom - fillTop);

    // Paint the major tick marks on the track
    g.setColor(new Color(0x31_A8_F8));
    int value = c.getMinimum();
    while (value <= c.getMaximum()) {
      int xpt = getXPositionForValue(c, r, value);
      g.fillOval(xpt, (int) r.getCenterY() - tickSize / 2, tickSize, tickSize);
      // Overflow checking
      if (Integer.MAX_VALUE - c.getMajorTickSpacing() < value) {
        break;
      }
      value += c.getMajorTickSpacing();
    }

    // JSlider.isFilled
    int fillRight = getXPositionForValue(c, r, c.getValue());
    g.setColor(new Color(0x21_98_F6));
    g.fillRoundRect(fillLeft, fillTop, fillRight - fillLeft, fillBottom - fillTop, arc, arc);
  }

  // @see javax/swing/plaf/basic/BasicSliderUI#xPositionForValue(int value)
  private int getXPositionForValue(JSlider slider, Rectangle trackRect, float value) {
    float min = slider.getMinimum();
    float max = slider.getMaximum();
    float pixelsPerValue = trackRect.width / (max - min);
    int trackLeft = trackRect.x;
    int trackRight = trackRect.x + trackRect.width - 1;
    int pos = trackLeft + Math.round(pixelsPerValue * (value - min));
    return Math.max(trackLeft, Math.min(trackRight, pos));
  }
});
slider.putClientProperty("Nimbus.Overrides", d);

References

• Paint the major tick marks inside the JSlider track and the current value inside the knob(Japanese)

Create a new JFrame when the JTabbedPane tab is dropped outside the frame

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

Code

class TabDragSourceListener implements DragSourceListener {
  @Override public void dragEnter(DragSourceDragEvent e) {
    e.getDragSourceContext().setCursor(DragSource.DefaultMoveDrop);
  }

  @Override public void dragExit(DragSourceEvent e) {
    e.getDragSourceContext().setCursor(DragSource.DefaultMoveNoDrop);
  }

  @Override public void dragDropEnd(DragSourceDropEvent e) {
    Component c = e.getDragSourceContext().getComponent();
    JRootPane root = ((JComponent) c).getRootPane();
    Class<GhostGlassPane> clz = GhostGlassPane.class;
    Optional.ofNullable(root.getGlassPane())
        .filter(clz::isInstance).map(clz::cast)
        .ifPresent(p -> p.setVisible(false));
    boolean dropSuccess = e.getDropSuccess();
    Window w = SwingUtilities.getWindowAncestor(c);
    boolean outOfFrame = !w.getBounds().contains(e.getLocation());
    if (dropSuccess && outOfFrame && c instanceof DnDTabbedPane) {
      DnDTabbedPane src = (DnDTabbedPane) c;
      int index = src.dragTabIndex;
      final Component cmp = src.getComponentAt(index);
      final Component tab = src.getTabComponentAt(index);
      final String title = src.getTitleAt(index);
      final Icon icon = src.getIconAt(index);
      final String tip = src.getToolTipTextAt(index);
      src.remove(index);
      DnDTabbedPane tabs = new DnDTabbedPane();
      tabs.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
      tabs.addTab(title, icon, cmp, tip);
      tabs.setTabComponentAt(0, tab);
      JFrame frame = new JFrame();
      frame.getContentPane().add(tabs);
      frame.setSize(320, 240);
      frame.setLocation(e.getLocation());
      frame.setVisible(true);
    }
  }

  @Override public void dropActionChanged(DragSourceDragEvent e) {
    /* not needed */
  }

  @Override public void dragOver(DragSourceDragEvent e) {
    /* not needed */
  }
}

References

• Create a new JFrame when the JTabbedPane tab is dropped outside the frame(Japanese)

Fix the JToolTip display of JList cells to correspond to after mouse wheel rotation

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

Code

JList<String> list1 = new JList<String>(model) {
  @Override public void updateUI() {
    super.updateUI();
    setCellRenderer(new TooltipListCellRenderer<>());
  }
};
JScrollPane scroll1 = new JScrollPane(list1);
scroll1.addMouseWheelListener(e -> {
  JScrollPane scrollPane = (JScrollPane) e.getComponent();
  Component view = scrollPane.getViewport().getView();
  MouseEvent event = SwingUtilities.convertMouseEvent(scrollPane, e, view);
  ToolTipManager.sharedInstance().mouseMoved(event);
});

References

• Fix the JToolTip display of JList cells to correspond to after mouse wheel rotation(Japanese)
• Tooltips, the mouse wheel and JScrollPane — oracle-tech

Change the selection focus Border of JTabbedPane to underline

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

Code

class UnderlineFocusTabbedPane extends JTabbedPane {
  private static final Border DEFAULT_BORDER =
      BorderFactory.createMatteBorder(0, 0, 3, 0, new Color(0x0, true));
  private static final Border SELECTED_BORDER =
      BorderFactory.createMatteBorder(0, 0, 3, 0, new Color(0x00_AA_FF));

  protected UnderlineFocusTabbedPane() {
    super();
  }

  @Override public void updateUI() {
    super.updateUI();
    // setFocusable(false);
    if (getUI() instanceof WindowsTabbedPaneUI) {
      setUI(new WindowsTabbedPaneUI() {
        @Override protected void paintFocusIndicator(
            Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex,
            Rectangle iconRect, Rectangle textRect, boolean isSelected) {
          super.paintFocusIndicator(g, tabPlacement, rects, tabIndex, iconRect, textRect, false);
        }
      });
    } else {
      setUI(new BasicTabbedPaneUI() {
        @Override protected void paintFocusIndicator(
            Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex,
            Rectangle iconRect, Rectangle textRect, boolean isSelected) {
          super.paintFocusIndicator(g, tabPlacement, rects, tabIndex, iconRect, textRect, false);
        }
      });
    }
    addChangeListener(e -> {
      JTabbedPane tabbedPane = (JTabbedPane) e.getSource();
      if (tabbedPane.getTabCount() <= 0) {
        return;
      }
      int idx = tabbedPane.getSelectedIndex();
      for (int i = 0; i < tabbedPane.getTabCount(); i++) {
        Component c = tabbedPane.getTabComponentAt(i);
        if (c instanceof JComponent) {
          ((JComponent) c).setBorder(i == idx ? SELECTED_BORDER : DEFAULT_BORDER);
        }
      }
    });
  }

  @Override public void insertTab(
      String title, Icon icon, Component component, String tip, int index) {
    super.insertTab(title, icon, component, tip, index);
    JLabel label = new JLabel(title, icon, SwingConstants.CENTER);
    setTabComponentAt(index, label);
  }
}

References

• Change the selection focus Border of JTabbedPane to underline(Japanese)