Qt5::窗体类

//窗体标题 
this->setWindowTitle("Qt5.1 窗体应用"); 
//窗体最大300*300 
this->setMaximumSize(300,300); 
//窗体最小300*300 
this->setMinimumSize(300,300);
//背景红色 
this->setStyleSheet("background:red");
//标题名 
this->setWindowTitle("移动无边框窗体"); 
//去掉标题栏 
this->setWindowFlags(Qt::FramelessWindowHint);
//关闭按钮失效 
this->setWindowFlags(Qt::WindowMinMaxButtonsHint); 
//去掉最大化、最小化按钮，保留关闭按钮 
this->setWindowFlags(Qt::WindowCloseButtonHint);
//去掉标题栏 
this->setWindowFlags(Qt::FramelessWindowHint); 
//设置背景透明 
this->setAttribute(Qt::WA_TranslucentBackground, true); 
//窗体添加样式，样式为CSS 样式表 
// background-image:url 添加图片 
// background-repeat:no-repeat 不平铺 
this->setStyleSheet("background-image:url(:/new/prefix1/touming);backgroundrepeat:no-repeat;");

QMenu *menu = new QMenu;//定义菜单
menu->addAction("addtion_1");//菜单选项
menu->addAction("addtion_2");
ui->pushButton->setMenu(menu);//设置按钮弹出菜单