Qt界面设计（隐藏窗体标题栏，制作按钮菜单）

最近工作需要，用到Qt，现在先写个小程序和大家分享下几个我觉比较重要的知识点，希望大家指正，以后再陆续更新

该例子主要功能有：

1，隐藏窗口标题栏，然后自己设计一个

2，新建close按钮

3，按钮菜单制作

void MyTest::Init()
{
    //隐藏窗口的标题栏
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinMaxButtonsHint);
    //添加窗口Close按钮
    IconHelper::Instance()->SetIcon(ui->Btn_close, QChar(0xf00d), 10);
    connect(ui->Btn_close, SIGNAL(clicked()), this, SLOT(close()));
    //添加菜单按钮
    IconHelper::Instance()->SetIcon(ui->Btn_Menu, QChar(0xf0c9), 10);
}

void MyTest::on_Btn_Menu_clicked()
{
    QMenu *menu = new QMenu();
    QAction *menu_new = new QAction(menu);
    QAction *menu_open = new QAction(menu);
    QAction *menu_close = new QAction(menu);

    menu_new->setText(tr("登陆"));
    menu_open->setText(tr("注册"));
    menu_close->setText(tr("注销"));

    menu->addAction(menu_new);
    menu->addAction(menu_open);
    menu->addAction(menu_close);

    ui->Btn_Menu->setMenu(menu);
}

加载qss文件

        

QString qss;

    QFile qssFile(":/ui.qss");

    qssFile.open(QFile::ReadOnly);

    if(qssFile.isOpen())
    {

        qss = QLatin1String(qssFile.readAll());

        qApp->setStyleSheet(qss);

        qssFile.close();
    }

iconhelper.cpp 和 iconhelper.h来源于网络

iconhelper.cpp

#include "iconhelper.h"

IconHelper* IconHelper::_instance = 0;
IconHelper::IconHelper(QObject*):
    QObject(qApp)
{
    QString runPath = QCoreApplication::applicationDirPath() + "./image/fontawesome-webfont.ttf";
    int fontId = QFontDatabase::addApplicationFont(runPath);
    QString fontName = QFontDatabase::applicationFontFamilies(fontId).at(0);
    iconFont = QFont(fontName);
}

void IconHelper::SetIcon(QLabel* lab, QChar c, int size)
{
    iconFont.setPointSize(size);
    lab->setFont(iconFont);
    lab->setText(c);
}

void IconHelper::SetIcon(QPushButton* btn, QChar c, int size)
{
    iconFont.setPointSize(size);
    btn->setFont(iconFont);
    btn->setText(c);
}

iconhelper.h

#ifndef ICONHELPER_H
#define ICONHELPER_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 

class IconHelper : public QObject
{
private:
    explicit IconHelper(QObject *parent = 0);
    QFont iconFont;
    static IconHelper* _instance;

public:
    static IconHelper* Instance()
    {
        static QMutex mutex;
        if (!_instance) {
            QMutexLocker locker(&mutex);
            if (!_instance) {
                _instance = new IconHelper;
            }
        }
        return _instance;
    }

    void SetIcon(QLabel* lab, QChar c, int size = 10);
    void SetIcon(QPushButton* btn, QChar c, int size = 10);

};

#endif // ICONHELPER_H

qss

.QPushButton#Btn_close, .QPushButton#Btn_Menu{
        border-radius:0px;
        color: #F0F0F0;
        background-color:rgba(0,0,0,0);
        border-style:none;
}

.QPushButton#Btn_close:hover{
        background-color: qlineargradient(spread:pad, x1:0, y1:1, x2:0, y2:0, stop:0 rgba(238, 0, 0, 128), stop:1 rgba(238, 44, 44, 255));
}

.QPushButton#Btn_Menu:hover{
        background-color: qlineargradient(spread:pad, x1:0, y1:1, x2:0, y2:0, stop:0 rgba(25, 134, 199, 0), stop:1 #636363);
}

.QPushButton#Btn_Menu:menu-indicator{
        image: none;
}

.QWidget#widget{
        background: qlineargradient(spread:pad, x1:0, y1:0, x2:0, y2:1, stop:0 #696969, stop:1 #808080);
}

.QMenu{
        background-color:white;
        padding: 1px;
}

.QMenu::item{
        background-color:transparent;
}

.QMenu::item:selected{
        background-color:rgb(234, 243, 253);
        color: black;
}

.QLineEdit#lineEdit, .QLineEdit#lineEdit_2{
        border: 1px solid #B8B8B8;
        border-radius: 5px;
        padding: 2px;
        background: none;
        selection-background-color: #454648;
}

.QLineEdit#lineEdit, .QLineEdit#lineEdit_2{
        lineedit-password-character: 9679;
 }

运行效果：