QWidget标题栏双击事件（QWidget::event里拦截NonClientAreaMouseButtonDblClick）

widget.h

1	virtual bool event(QEvent *event);

　　

widget.cpp

bool Widget::event(QEvent *event)
{
    if (event->type() == QEvent::NonClientAreaMouseButtonDblClick)
                qDebug() << "title double clicked event";
    return QWidget::event(event);
}

http://www.cnblogs.com/bugchecker/p/4583041.html