Swing/MagneticFrame のバックアップ(No.11)

desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
desktop.setDesktopManager(new DefaultDesktopManager() {
  @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);
    }
    super.dragFrame(frame, x, y);
  }
  private boolean isNear(int c) {
    return (Math.abs(c)<10);
  }
});