ui.serviceType->setFixedWidth(95);
m_mainMenu = new QMenu(this);
m_osSubMenu = new QMenu(this);
m_appSubMenu = new QMenu(this);
 
m_details = new QAction(QStringLiteral("Details"),this);
m_details->setCheckable(true);
m_details->setChecked(true);
m_settings = new QAction(QStringLiteral("Settings"), this);
m_settings->setIcon(QIcon(":/misc/preference"));
m_settings->setShortcut(QKeySequence::Print);
m_os = new QAction(QStringLiteral("OS"), this);
m_app = new QAction(QStringLiteral("Applications"), this);
 
m_github = new QAction(QStringLiteral("Github"), this);
m_github->setIcon(QIcon(":/app/github"));
m_github->setShortcut(QKeySequence("Ctrl+G"));
m_amazon = new QAction(QStringLiteral("Amazon"), this);
m_amazon->setIcon(QIcon(":/app/amazon"));
m_photoshop = new QAction(QStringLiteral("Photoshop"), this);
m_photoshop->setIcon(QIcon(":/app/photoshop"));
m_facebook = new QAction(QStringLiteral("Facebook"), this);
m_facebook->setIcon(QIcon(":/app/facebook"));
 
m_apple = new QAction(QStringLiteral("Apple"), this);
m_apple->setShortcut(QKeySequence("Ctrl+A"));
m_apple->setIcon(QIcon(":/os/apple"));
m_windows = new QAction(QStringLiteral("Windows"), this);
m_windows->setIcon(QIcon(":/os/windows"));
m_windows->setShortcut(QKeySequence("Ctrl+W"));
m_fedora = new QAction(QStringLiteral("Fedora"), this);
m_fedora->setIcon(QIcon(":/os/fedora"));
m_fedora->setDisabled(true);
 
m_osSubMenu->addAction(m_apple);
m_osSubMenu->addAction(m_windows);
m_osSubMenu->addAction(m_fedora);
m_os->setMenu(m_osSubMenu);
 
m_appSubMenu->addAction(m_amazon);
m_appSubMenu->addAction(m_github);
m_appSubMenu->addAction(m_facebook);
m_appSubMenu->addSeparator();
m_appSubMenu->addAction(m_photoshop);
m_app->setMenu(m_appSubMenu);
 
m_mainMenu->addAction(m_details);
m_mainMenu->addSeparator();
m_mainMenu->addAction(m_os);
m_mainMenu->addAction(m_app);
m_mainMenu->addAction(m_settings);
 
ui.serviceType->setMenu(m_mainMenu)

效果图：

QStyleSheet

上面示例展示出原生态样式，灰蒙蒙不好看。那么用QSS对外形样式进行改造，我们将所有的样式语句放到一个*.qss文件中，然后在main函数中加载。需要注意的是，我们应该将.qss文件添加到.qrc文件中进行编译。每一次修改.qss文件之后应该重新编译.qrc文件。否则在界面上将看不出任何改变。代码如下：

QFile file(``":/ThemeRoller/style"``);

file.open(QFile::ReadOnly);

qApp->setStyleSheet(file.readAll());

file.close();

先考虑将QPushButton作为练手对象，编写如下QSS代码：

QPushButton {

background: white;

border: 1px solid rgb (41, 57, 85);

border-radius: 3px;  # 设置边框具备3个像素的圆角

font-weight: bold;    # 字体设置为加粗

}

QPushButton:hover {

background: lightgray;

}

效果对比如下：

image