Non Selectable JComboBox Items

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

Code

class DisableItemComboBox<E> extends JComboBox<E> {
  private final Set<Integer> disableIndexSet = new HashSet<>();
  private boolean isDisableIndex;
  private final Action up = new AbstractAction() {
    @Override public void actionPerformed(ActionEvent e) {
      int si = getSelectedIndex();
      for (int i = si - 1; i >= 0; i--) {
        if (!disableIndexSet.contains(i)) {
          setSelectedIndex(i);
          break;
        }
      }
    }
  };
  private final Action down = new AbstractAction() {
    @Override public void actionPerformed(ActionEvent e) {
      int si = getSelectedIndex();
      for (int i = si + 1; i < getModel().getSize(); i++) {
        if (!disableIndexSet.contains(i)) {
          setSelectedIndex(i);
          break;
        }
      }
    }
  };

  public DisableItemComboBox() {
    super();
  }

  public DisableItemComboBox(ComboBoxModel<E> aModel) {
    super(aModel);
  }

  public DisableItemComboBox(E[] items) {
    super(items);
  }

  @Override public void updateUI() {
    super.updateUI();
    setRenderer(new DefaultListCellRenderer() {
      @Override public Component getListCellRendererComponent(
          JList list, Object value, int index,
          boolean isSelected, boolean cellHasFocus) {
        Component c;
        if (disableIndexSet.contains(index)) {
          c = super.getListCellRendererComponent(
              list, value, index, false, false);
          c.setEnabled(false);
        } else {
          c = super.getListCellRendererComponent(
              list, value, index, isSelected, cellHasFocus);
          c.setEnabled(true);
        }
        return c;
      }
    });
    ActionMap am = getActionMap();
    am.put("selectPrevious3", up);
    am.put("selectNext3", down);
    InputMap im = getInputMap();
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), "selectPrevious3");
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_KP_UP, 0), "selectPrevious3");
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), "selectNext3");
    im.put(KeyStroke.getKeyStroke(KeyEvent.VK_KP_DOWN, 0), "selectNext3");
  }

  public void setDisableIndex(Set<Integer> set) {
    disableIndexSet.clear();
    for (Integer i: set) {
      disableIndexSet.add(i);
    }
  }

  @Override public void setPopupVisible(boolean v) {
    if (!v && isDisableIndex) {
      isDisableIndex = false;
    } else {
      super.setPopupVisible(v);
    }
  }

  @Override public void setSelectedIndex(int index) {
    if (disableIndexSet.contains(index)) {
      isDisableIndex = true;
    } else {
      // isDisableIndex = false;
      super.setSelectedIndex(index);
    }
  }
}

References

• Non Selectable JComboBox Items(Japanese)

TabTransferHandler

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

Code

class TabTransferHandler extends TransferHandler {
  private final DataFlavor localObjectFlavor = new DataFlavor(DnDTabData.class, "DnDTabData");
  private DnDTabbedPane source = null;

  @Override protected Transferable createTransferable(JComponent c) {
    System.out.println("createTransferable");
    if (c instanceof DnDTabbedPane) source = (DnDTabbedPane) c;
    return new Transferable() {
      @Override public DataFlavor[] getTransferDataFlavors() {
        return new DataFlavor[] {localObjectFlavor};
      }

      @Override public boolean isDataFlavorSupported(DataFlavor flavor) {
        return Objects.equals(localObjectFlavor, flavor);
      }

      @Override public Object getTransferData(DataFlavor flavor) 
            throws UnsupportedFlavorException, IOException {
        if (isDataFlavorSupported(flavor)) {
          return new DnDTabData(source);
        } else {
           throw new UnsupportedFlavorException(flavor);
        }
      }
    };
  }

  @Override public boolean canImport(TransferSupport support) {
    // System.out.println("canImport");
    if (!support.isDrop() || !support.isDataFlavorSupported(localObjectFlavor)) {
      return false;
    }
    support.setDropAction(TransferHandler.MOVE);
    DropLocation tdl = support.getDropLocation();
    Point pt = tdl.getDropPoint();
    DnDTabbedPane target = (DnDTabbedPane) support.getComponent();
    target.autoScrollTest(pt);
    DnDTabbedPane.DropLocation dl =
      (DnDTabbedPane.DropLocation) target.dropLocationForPoint(pt);
    int idx = dl.getIndex();
    boolean isDroppable = false;

    if (target == source) {
      isDroppable = target.getTabAreaBounds().contains(pt) && idx >= 0 &&
                   idx != target.dragTabIndex && idx != target.dragTabIndex + 1;
    } else {
      if (source != null && target != source.getComponentAt(source.dragTabIndex)) {
        isDroppable = target.getTabAreaBounds().contains(pt) && idx >= 0;
      }
    }

    Component c = target.getRootPane().getGlassPane();
    c.setCursor(isDroppable?DragSource.DefaultMoveDrop:DragSource.DefaultMoveNoDrop);
    if (isDroppable) {
      support.setShowDropLocation(true);
      dl.setDroppable(true);
      target.setDropLocation(dl, null, true);
      return true;
    } else {
      support.setShowDropLocation(false);
      dl.setDroppable(false);
      target.setDropLocation(dl, null, false);
      return false;
    }
  }

  private BufferedImage makeDragTabImage(DnDTabbedPane tabbedPane) {
    Rectangle rect = tabbedPane.getBoundsAt(tabbedPane.dragTabIndex);
    BufferedImage image = new BufferedImage(
      tabbedPane.getWidth(), tabbedPane.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics g = image.getGraphics();
    tabbedPane.paint(g);
    g.dispose();
    if (rect.x < 0) {
      rect.translate(-rect.x, 0);
    }
    if (rect.y < 0) {
      rect.translate(0, -rect.y);
    }
    if (rect.x + rect.width > image.getWidth()) {
      rect.width = image.getWidth() - rect.x;
    }
    if (rect.y + rect.height > image.getHeight()) {
      rect.height = image.getHeight() - rect.y;
    }
    return image.getSubimage(rect.x, rect.y, rect.width, rect.height);
  }

  @Override public int getSourceActions(JComponent c) {
    System.out.println("getSourceActions");
    if (c instanceof DnDTabbedPane) {
      DnDTabbedPane src = (DnDTabbedPane) c;
      c.getRootPane().setGlassPane(new GhostGlassPane(src));
      if (src.dragTabIndex < 0) {
        return TransferHandler.NONE;
      }
      setDragImage(makeDragTabImage(src));
      c.getRootPane().getGlassPane().setVisible(true);
      return TransferHandler.MOVE;
    }
    return TransferHandler.NONE;
  }

  @Override public boolean importData(TransferSupport support) {
    System.out.println("importData");

    DnDTabbedPane target = (DnDTabbedPane) support.getComponent();
    DnDTabbedPane.DropLocation dl = target.getDropLocation();
    try {
      DnDTabbedPane source = (DnDTabbedPane) support.getTransferable()
        .getTransferData(localObjectFlavor);
      int index = dl.getIndex(); //boolean insert = dl.isInsert();
      if (target == source) {
        source.convertTab(source.dragTabIndex, index);
      } else {
        source.exportTab(source.dragTabIndex, target, index);
      }
      return true;
    } catch (UnsupportedFlavorException ufe) {
      ufe.printStackTrace();
    } catch (IOException ioe) {
      ioe.printStackTrace();
    }
    return false;
  }

  @Override protected void exportDone(JComponent c, Transferable data, int action) {
    System.out.println("exportDone");
    DnDTabbedPane src = (DnDTabbedPane) c;
    c.getRootPane().getGlassPane().setVisible(false);
    src.setDropLocation(null, null, false);
  }
}

References

• DnDTabbedPane
• DnDExportTabbedPane(Japanese)

make Explorer like JTable File List

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

Code

// @see SwingUtilities2.pointOutsidePrefSize(...)
private static Rectangle getCellRect2(JTable table, int row, int col) {
  TableCellRenderer tcr = table.getCellRenderer(row, col);
  Object value = table.getValueAt(row, col);
  Component cell = tcr.getTableCellRendererComponent(
      table, value, false, false, row, col);
  Dimension itemSize = cell.getPreferredSize();
  Rectangle cellBounds = table.getCellRect(row, col, false);
  cellBounds.width = itemSize.width;
  return cellBounds;
  // FontMetrics fm = table.getFontMetrics(table.getFont());
  // Object o = table.getValueAt(row, col);
  // int w = fm.stringWidth(o.toString()) + 16 + 2 + 2;
  // Rectangle rect = table.getCellRect(row, col, true);
  // rect.setSize(w, rect.height);
  // return rect;
}

References

• make Explorer like JTable File List(Japanese)

snap to ticks drag JSlider

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

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)

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)