Swing/MagneticFrame のバックアップの現在との差分(No.11)

desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
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desktop.setDesktopManager(new DefaultDesktopManager() {
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desktop.setDesktopManager(new MagneticDesktopManager());
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// ...
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class MagneticDesktopManager extends DefaultDesktopManager {
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  @Override public void dragFrame(JComponent frame, int x, int y) {
    int e = x; int n = y;
    int w = desktop.getSize().width -frame.getSize().width -e;
    int s = desktop.getSize().height-frame.getSize().height-n;
    if(isNear(e) || isNear(n) || isNear(w) || isNear(s)) {
      x = (e<w)?(isNear(e)?0:e):(isNear(w)?w+e:e);
      y = (n<s)?(isNear(n)?0:n):(isNear(s)?s+n:n);
    Container c = SwingUtilities.getAncestorOfClass(JDesktopPane.class, frame);
    if (c instanceof JDesktopPane) {
      JDesktopPane desktop = (JDesktopPane) c;
      int e = x;
      int n = y;
      int w = desktop.getSize().width - frame.getSize().width - e;
      int s = desktop.getSize().height - frame.getSize().height - n;
      if (isNear(e) || isNear(n) || isNear(w) || isNear(s)) {
        super.dragFrame(frame, getX(e, w), getY(n, s));
      } else {
        super.dragFrame(frame, x, y);
      }
    }
    super.dragFrame(frame, x, y);
  }
  private boolean isNear(int c) {
    return (Math.abs(c)<10);
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  private static int getX(int e, int w) {
    return e < w ? isNear(e) ? 0 : e : isNear(w) ? w + e : e;
  }
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});
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  private static int getY(int n, int s) {
    return n < s ? isNear(n) ? 0 : n : isNear(s) ? s + n : n;
  }
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  private static boolean isNear(int c) {
    return Math.abs(c) < 10;
  }
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}
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