Jump to clicked position JSlider

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

Code

slider.setUI(new MetalSliderUI() {
  @Override protected TrackListener createTrackListener(JSlider slider) {
    return new TrackListener() {
      @Override public void mousePressed(MouseEvent e) {
        if (UIManager.getBoolean("Slider.onlyLeftMouseButtonDrag")
              && SwingUtilities.isLeftMouseButton(e)) {
          JSlider slider = (JSlider) e.getComponent();
          switch (slider.getOrientation()) {
          case SwingConstants.VERTICAL:
            slider.setValue(valueForYPosition(e.getY()));
            break;
          case SwingConstants.HORIZONTAL:
            slider.setValue(valueForXPosition(e.getX()));
            break;
          default:
            throw new IllegalArgumentException(
                "orientation must be one of: VERTICAL, HORIZONTAL");
          }
          super.mousePressed(e); //isDragging = true;
          super.mouseDragged(e);
        } else {
          super.mousePressed(e);
        }
      }

      @Override public boolean shouldScroll(int direction) {
        return false;
      }
    };
  }
});

References

• JSlider question: Position after leftclick - Stack Overflow
• Jump to clicked position JSlider(Japanese)

add JInternalFrame to Undecorated JFrame

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

Code

JInternalFrame internal = new JInternalFrame("...");
BasicInternalFrameUI ui = (BasicInternalFrameUI) internal.getUI();
Component title = ui.getNorthPane();
for (MouseMotionListener l: title.getListeners(MouseMotionListener.class)) {
  title.removeMouseMotionListener(l);
}
DragWindowListener dwl = new DragWindowListener();
title.addMouseListener(dwl);
title.addMouseMotionListener(dwl);
JPanel p = new JPanel(new BorderLayout());
p.add(new JScrollPane(new JTree()));
p.add(new JButton(new AbstractAction("close") {
  @Override public void actionPerformed(ActionEvent e) {
    Window w = SwingUtilities.windowForComponent((Component) e.getSource());
    // w.dispose();
    w.getToolkit().getSystemEventQueue().postEvent(
      new WindowEvent(w, WindowEvent.WINDOW_CLOSING));
  }
}), BorderLayout.SOUTH);
internal.getContentPane().add(p);
internal.setVisible(true);

KeyboardFocusManager focusManager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
focusManager.addPropertyChangeListener(e -> {
  String prop = e.getPropertyName();
  if ("activeWindow".equals(prop)) {
    try {
      internal.setSelected(Objects.nonNull(e.getNewValue()));
    } catch (PropertyVetoException ex) {
      throw new IllegalStateException(ex);
    }
  }
});

References

• add JInternalFrame to Undecorated JFrame(Japanese)