Swing/RubberBanding のバックアップの現在との差分(No.10)

JListのアイテムを範囲指定で選択

概要

#screenshot

サンプルコード

#spanend
#spandel
class MyList extends JList {
#spanend
  private final Color rcolor;
  private final Color pcolor;
  private final AlphaComposite alcomp
  private final Polygon polygon = new Polygon();
  private final Line2D line = new Line2D.Double();
  private Point srcPoint = null;
  public MyList(ListModel model) {
#spanadd
* サンプルコード [#sourcecode]
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#spanadd
#code(link){{
#spanend
#spanadd
class RubberBandSelectionList<E extends ListItem> extends JList<E> {
#spanend
  private static final AlphaComposite ALPHA =
    AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .1f);
  private RubberBandListCellRenderer<E> renderer;
  private Color polygonColor;
  public RubberBandSelectionList(ListModel<E> model) {
    super(model);
    rcolor = SystemColor.activeCaption;
    pcolor = makeColor(rcolor);
    alcomp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f);
    setLayoutOrientation(JList.HORIZONTAL_WRAP);
    setVisibleRowCount(0);
    setFixedCellWidth(62);
    setFixedCellHeight(62);
    setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    setCellRenderer(new ListCellRenderer() {
      public Component getListCellRendererComponent(
          JList list, Object value, int index, boolean isSelected,
          boolean cellHasFocus) {
        MyIcon icon = (MyIcon)getModel().getElementAt(index);
        icon.setSelected(isSelected);
        icon.setFocused(cellHasFocus);
        return icon;
      }
    });
    addMouseMotionListener(new MouseMotionAdapter() {
      public void mouseDragged(MouseEvent e){
        if(srcPoint==null) srcPoint = e.getPoint();
        Point destPoint = e.getPoint();
        polygon.reset();
        polygon.addPoint(srcPoint.x,  srcPoint.y);
        polygon.addPoint(destPoint.x, srcPoint.y);
        polygon.addPoint(destPoint.x, destPoint.y);
        polygon.addPoint(srcPoint.x,  destPoint.y);
        if(srcPoint.getX()==destPoint.getX() ||
           srcPoint.getY()==destPoint.getY()) {
          line.setLine(srcPoint.getX(),srcPoint.getY(),
                       destPoint.getX(),destPoint.getY());
          setSelectedIndices(getIntersectsIcons(line));
        }else{
          setSelectedIndices(getIntersectsIcons(polygon));
        }
        repaint();
      }
    });
    addMouseListener(new MouseAdapter() {
      public void mouseReleased(MouseEvent e) {
        srcPoint = null;
        repaint();
      }
      public void mousePressed(MouseEvent e) {
        if(locationToIndex(e.getPoint())<0) {
          clearSelection();
          repaint();
        }else{
          int index = locationToIndex(e.getPoint());
          MyIcon icon = (MyIcon)getModel().getElementAt(index);
          Rectangle rect = getCellBounds(index,index);
          if(!rect.contains(e.getPoint())) {
            clearSelection();
            repaint();
          }
        }
      }
    });
  }
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    if(srcPoint==null) return;
    Graphics2D g2d = (Graphics2D) g;
    g2d.setPaint(rcolor);
    g2d.drawPolygon(polygon);
    g2d.setComposite(alcomp);
    g2d.setPaint(pcolor);
    g2d.fillPolygon(polygon);
  }
  private int[] getIntersectsIcons(Shape p) {
    ListModel model = getModel();
    Vector list = new Vector(model.getSize());
    for(int i=0;i<model.getSize();i++) {
      Rectangle r = MyList.this.getCellBounds(i,i);
      if(p.intersects(r)) {
        list.add(i);
      }
#spanadd

#spanend
  @Override public void updateUI() {
    setSelectionForeground(null);
    setSelectionBackground(null);
    setCellRenderer(null);
    if (renderer == null) {
      renderer = new RubberBandListCellRenderer<E>();
    } else {
      removeMouseMotionListener(renderer);
      removeMouseListener(renderer);
    }
    int[] il = new int[list.size()];
    for(int i=0;i<list.size();i++) {
      il[i] = list.get(i);
    }
    return il;
  }
  private Color makeColor(Color c) {
    super.updateUI();
    EventQueue.invokeLater(() -> {
      setCellRenderer(renderer);
      addMouseMotionListener(renderer);
      addMouseListener(renderer);
      setLayoutOrientation(JList.HORIZONTAL_WRAP);
      setVisibleRowCount(0);
      setFixedCellWidth(62);
      setFixedCellHeight(62);
      setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
    });
    Color c = getSelectionBackground();
    int r = c.getRed();
    int g = c.getGreen();
    int b = c.getBlue();
    if(r>g) return (r>b)?new Color(r,0,0):new Color(0,0,b);
    else    return (g>b)?new Color(0,g,0):new Color(0,0,b);
    polygonColor = r > g ? r > b ? new Color(r, 0, 0) : new Color(0, 0, b)
                         : g > b ? new Color(0, g, 0) : new Color(0, 0, b);
  }
#spanadd

#spanend
  @Override protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    if (renderer != null && renderer.polygon != null) {
      Graphics2D g2 = (Graphics2D) g.create();
      g2.setPaint(getSelectionBackground());
      g2.draw(renderer.polygon);
      g2.setComposite(ALPHA);
      g2.setPaint(polygonColor);
      g2.fill(renderer.polygon);
      g2.dispose();
    }
  }
}

• &jnlp;
• &jar;
• &zip;

• JList内のアイテムの配置はJList#setLayoutOrientation(JList.HORIZONTAL_WRAP)メソッドを使っているため水平方向で整列される
• ラバーバンド矩形内部に重なるアイテムアイコンを検索しそれをJList#setSelectedIndices(int[])で選択状態に変更
  • 選択範囲が矩形にならずに直線になっている場合は別途その直線と交差するアイテムを選択 PolygonではなくPath2Dを使用することでこれを回避
  • JDK 1.8.0以降なら以下をl.setSelectedIndices(IntStream.range(0, l.getModel().getSize()).filter(i -> p.intersects(l.getCellBounds(i, i))).toArray());で置き換え可能

• Can someone optimise the following code ?
• XP Style Icons - Windows Application Icon, Software XP Icons

  #spanend
  #spanadd
  private int[] getIntersectsIcons(JList l, Shape p) {
  #spanend
    ListModel model = l.getModel();
    List<Integer> list = new ArrayList<>(model.getSize());
    for (int i = 0; i < model.getSize(); i++) {
      Rectangle r = l.getCellBounds(i, i);
      if (p.intersects(r)) {
        list.add(i);
      }
    }
    // JDK 1.8.0以降のstreamでList<Integer>をプリミティブなint配列に変換:
    // return list.stream().mapToInt(i -> i).toArray();
    int[] il = new int[list.size()];
    for (int i = 0; i < list.size(); i++) {
      il[i] = list.get(i);
    }
    return il;
  #spanadd
  }
  #spanend
  #spanadd
  

• Swing - Can someone optimise the following code ?
• XP Style Icons - Download
• JListのアイテムをラバーバンドで複数選択、ドラッグ＆ドロップで並べ替え
  • このラバーバンドで選択したアイテムを実際にドラッグして並べ替えるサンプル