Java Swing Tips

2009/12/21

snap to ticks drag JSlider

Code

slider.setUI(new MetalSliderUI() {
  @Override protected TrackListener createTrackListener(final JSlider slider) {
    return new TrackListener() {
      @Override public void mouseDragged(MouseEvent e) {
        if (!slider.getSnapToTicks() || slider.getMajorTickSpacing() == 0) {
          super.mouseDragged(e);
          return;
        }
        // case SwingConstants.HORIZONTAL:
        int halfThumbWidth = thumbRect.width / 2;
        final int trackLength = trackRect.width;
        final int trackLeft = trackRect.x - halfThumbWidth;
        final int trackRight = trackRect.x + trackRect.width - 1 + halfThumbWidth;
        int xPos = e.getX();
        int snappedPos = xPos;
        if (xPos <= trackLeft) {
          snappedPos = trackLeft;
        } else if (xPos >= trackRight) {
          snappedPos = trackRight;
        } else {
          // int tickSpacing = slider.getMajorTickSpacing();
          // float actualPixelsForOneTick =
          //     trackLength * tickSpacing / (float) slider.getMaximum();

          // a problem if you choose to set a negative MINIMUM for the JSlider;
          // the calculated drag-positions are wrong.
          // Fixed by bobndrew:
          int possibleTickPositions = slider.getMaximum() - slider.getMinimum();
          int tickSpacing = (slider.getMinorTickSpacing() == 0)
              ? slider.getMajorTickSpacing()
              : slider.getMinorTickSpacing();
          float actualPixelsForOneTick =
              trackLength * tickSpacing / (float) possibleTickPositions;
          xPos -= trackLeft;
          snappedPos = (int) (Math.round(
              xPos / actualPixelsForOneTick) * actualPixelsForOneTick + .5) + trackLeft;
          offset = 0;
          // System.out.println(snappedPos);
        }
        e.translatePoint(snappedPos - e.getX(), 0);
        super.mouseDragged(e);
      }
    };
  }
});

References

snap to ticks drag JSlider(Japanese)

2009/11/30

Jump to clicked position JSlider

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

2009/11/13

add JInternalFrame to Undecorated JFrame

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)

2009/10/29

JCheckBoxMenuItem Icon

Code

UIManager.put("CheckBoxMenuItem.checkIcon", new Icon() {
  @Override public void paintIcon(Component c, Graphics g, int x, int y) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.translate(x, y);
    ButtonModel m = ((AbstractButton) c).getModel();
    g2.setPaint(m.isSelected() ? Color.ORANGE : Color.GRAY);
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.fillOval(0, 2, 10, 10);
    g2.dispose();
  }

  @Override public int getIconWidth()  {
    return 14;
  }

  @Override public int getIconHeight() {
    return 14;
  }
});
menu.add(new JCheckBoxMenuItem("checkIcon test"));

References

JCheckBoxMenuItem Icon(Japanese)

2009/10/06

Multiple JButtons in a JTable cell

Code

class ButtonsPanel extends JPanel {
  public final List<JButton> buttons =
    Arrays.asList(new JButton("view"), new JButton("edit"));
  public ButtonsPanel() {
    super();
    setOpaque(true);
    for (JButton b: buttons) {
      b.setFocusable(false);
      b.setRolloverEnabled(false);
      add(b);
    }
  }
}

class ButtonsRenderer extends ButtonsPanel
                      implements TableCellRenderer {
  public ButtonsRenderer() {
    super();
    setName("Table.cellRenderer");
  }

  @Override public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected,
      boolean hasFocus, int row, int column) {
    Color bgc = isSelected ? table.getSelectionBackground()
                           : table.getBackground()
    setBackground(bgc);
    return this;
  }
}

class ButtonsEditor extends ButtonsPanel
                    implements TableCellEditor {
  public ButtonsEditor(final JTable table) {
    super();
    // ---->
    // DEBUG: view button click
    //   -> control key down + edit button(same cell) press
    //   -> remain selection color
    MouseListener ml = new MouseAdapter() {
      @Override public void mousePressed(MouseEvent e) {
        ButtonModel m = ((JButton) e.getSource()).getModel();
        if (m.isPressed() && table.isRowSelected(table.getEditingRow())
                          && e.isControlDown()) {
          setBackground(table.getBackground());
        }
      }
    };
    buttons.get(0).addMouseListener(ml);
    buttons.get(1).addMouseListener(ml);
    // <----

    buttons.get(0).addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        fireEditingStopped();
        JOptionPane.showMessageDialog(table, "Viewing");
      }
    });

    buttons.get(1).addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        int row = table.convertRowIndexToModel(table.getEditingRow());
        Object o = table.getModel().getValueAt(row, 0);
        fireEditingStopped();
        JOptionPane.showMessageDialog(table, "Editing: " + o);
      }
    });

    addMouseListener(new MouseAdapter() {
      @Override public void mousePressed(MouseEvent e) {
        fireEditingStopped();
      }
    });
  }

  @Override public Component getTableCellEditorComponent(JTable table,
        Object value, boolean isSelected, int row, int column) {
    this.setBackground(table.getSelectionBackground());
    return this;
  }

  @Override public Object getCellEditorValue() {
    return "";
  }

  // Copied from AbstractCellEditor
  // protected EventListenerList listenerList = new EventListenerList();
  transient protected ChangeEvent changeEvent = null;
  @Override public boolean isCellEditable(java.util.EventObject e) {
    return true;
  }
// ...

Google Tag Manager

2009/12/21

snap to ticks drag JSlider

Code

References

2009/11/30

Jump to clicked position JSlider

Code

References

2009/11/13

add JInternalFrame to Undecorated JFrame

Code

References

2009/10/29

JCheckBoxMenuItem Icon

Code

References

2009/10/06

Multiple JButtons in a JTable cell

Code

References