Swing/DnDList のバックアップの現在との差分(No.3)

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@Override protected void paintComponent(Graphics g) {
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  super.paintComponent(g);
  if (targetIndex >= 0) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setPaint(lineColor);
    g2.fill(targetLine);
    g2.dispose();
  }
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}
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#screenshot
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private void initTargetLine(Point p) {
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  Rectangle rect = getCellBounds(0, 0);
  int cellHeight = rect.height;
  int lineHeight = 2;
  int modelSize  = getModel().getSize();
  targetIndex = -1;
  targetLine.setSize(rect.width, lineHeight);
  for (int i = 0; i < modelSize; i++) {
    rect.setLocation(0, cellHeight * i - cellHeight / 2);
    if (rect.contains(p)) {
      targetIndex = i;
      targetLine.setLocation(0, i * cellHeight);
      break;
    }
  }
  if (targetIndex < 0) {
    targetIndex = modelSize;
    targetLine.setLocation(0, targetIndex * cellHeight - lineHeight);
  }
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}
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**サンプルコード [#kadf6356]
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 private Rectangle2D raCueLine = new Rectangle2D.Float();
 private Rectangle2D midArea   = new Rectangle2D.Float();
 public void dragOver(final DropTargetDragEvent e) {
   Graphics2D g2  = (Graphics2D) list1.getGraphics();
   int cellHeight = (int) list1.getCellBounds(0,0).getHeight();
   int cellWidht  = (int) list1.getCellBounds(0,0).getWidth();
   boolean flag   = false;
   for(int i=0;i<=model.getSize();i++) {
     midArea.setRect(0, cellHeight*i - (int) (cellHeight/2), cellWidht, cellHeight);
     if(midArea.contains(e.getLocation())) {
       flag = true;
       targetIndex = i;
       g2.setColor(lineColor);
     }else{
       g2.setColor(list1.getBackground());
     }
     raCueLine.setRect(0, i*cellHeight, cellWidht, 2);
     g2.fill(raCueLine);
   }
   //セルの間にターゲットが無かった場合リストの一番下にラインを引く
   if(!flag) {
     targetIndex = model.getSize();
     raCueLine.setRect(0, targetIndex*cellHeight, cellWidht, 2);
     g2.setColor(lineColor);
     g2.fill(raCueLine);
   }
   if(isDragAcceptable(e)) {
     e.acceptDrag(e.getDropAction());
   }else{
     e.rejectDrag();
   }
   //選択がずれないように…
   list1.setSelectedIndex(draggedIndex);
 }
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@Override public void dragOver(final DropTargetDragEvent e) {
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  if (isDragAcceptable(e)) {
    e.acceptDrag(e.getDropAction());
  } else {
    e.rejectDrag();
    return;
  }
  initTargetLine(e.getLocation());
  repaint();
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}
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 public void drop(DropTargetDropEvent e) {
   Point point = e.getLocation();
   Transferable t = e.getTransferable();
   DataFlavor[] f = t.getTransferDataFlavors();
   try {
     if(isDropAcceptable(e)) {
       Component comp = (Component) t.getTransferData(f[0]);
       Object str = model.getElementAt(draggedIndex);
       if(targetIndex==draggedIndex) {
         list1.setSelectedIndex(targetIndex);
       }else if(targetIndex<draggedIndex) {
         model.removeElementAt(draggedIndex);
         model.insertElementAt(str, targetIndex);
         list1.setSelectedIndex(targetIndex);
       }else{
         model.insertElementAt(str, targetIndex);
         model.removeElementAt(draggedIndex);
         list1.setSelectedIndex(targetIndex-1);
       }
       e.dropComplete(true);
     }else{
       e.dropComplete(false);
     }
   }catch(UnsupportedFlavorException ex) {
     e.dropComplete(false);
   }catch(IOException ie) {
     e.dropComplete(false);
   }
   e.dropComplete(false);
   targetIndex = -1;
   list1.repaint();
 }
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@Override public void drop(DropTargetDropEvent e) {
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  DefaultListModel model = (DefaultListModel) getModel();
  Transferable t = e.getTransferable();
  DataFlavor[] f = t.getTransferDataFlavors();
  try {
    if (isDropAcceptable(e)) {
      Component comp = (Component) t.getTransferData(f[0]);
      Object str = model.getElementAt(draggedIndex);
      if (targetIndex == draggedIndex) {
        setSelectedIndex(targetIndex);
      } else if (targetIndex < draggedIndex) {
        model.removeElementAt(draggedIndex);
        model.insertElementAt(str, targetIndex);
        setSelectedIndex(targetIndex);
      } else {
        model.insertElementAt(str, targetIndex);
        model.removeElementAt(draggedIndex);
        setSelectedIndex(targetIndex - 1);
      }
      e.dropComplete(true);
    } else {
      e.dropComplete(false);
    }
  } catch (UnsupportedFlavorException | IOException ex) {
    e.dropComplete(false);
  }
  e.dropComplete(false);
  targetIndex = -1;
  repaint();
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}
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