Qt无边框窗口的“关闭”和“移动”

关于“关闭/退出”：

this->setWindowFlags(Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint);    //不用Qt::SubWindow。
QPushButton *pb = new QPushButton(this);
pb->setText(tr("关闭"));
connect(pb,SIGNAL(clicked()),this,SLOT(close()));

关于“鼠标拖动”：

//QMoveTest.h
void mousePressEvent(QMouseEvent *e);
void mouseMoveEvent(QMouseEvent *e);
void mouseReleaseEvent(QMouseEvent *e);
QPoint startRelativePos;

//QMoveTest.cpp
void QMoveTest::mousePressEvent(QMouseEvent *e)
{
if (e->buttons() == Qt::LeftButton)
startRelativePos = e->pos();
}
void QMoveTest::mouseMoveEvent(QMouseEvent *e)
{
if (e->buttons() & Qt::LeftButton)
move(e->globalPos() - startRelativePos);
}
void QMoveTest::mouseReleaseEvent(QMouseEvent *e)
{
e->accept();
}

示例：