自制標題欄

this->setWindowFlags(Qt::FramelessWindowHint);//去除Qt自帶的標題欄

去除標題欄後為了實現窗體的視窗最大化、最小化、關閉以及移動事件，需要自定義以下操作：

1.視窗最大化事件

自制QPushButton按鈕，連線到showMax（）事件上

void QiXin_companyItemClass::showMax()
{
    int deskWidth = QApplication::desktop()->availableGeometry().width();
    int deskHeight = QApplication::desktop
 
()->availableGeometry().height();//除去工作列後高度  
    this->move(QApplication::desktop()->availableGeometry().x(), QApplication::desktop()->availableGeometry().y());
    this->resize(deskWidth, deskHeight);
    ui->pushButton_2->disconnect();
    connect(ui->pushButton_2, SIGNAL(clicked()), this, SLOT(showNorma()));
}
void
 
 showNorma()
{
    QDesktopWidget* desktopWidget = QApplication::desktop();
    int deskWidth = QApplication::desktop()->availableGeometry().width();
    int deskHeight = QApplication::desktop()->availableGeometry().height();//除去工作列後高度  
    this->resize(deskWidth * 2 / 3, deskWidth * 2*950 / 3/1400
 
);
    this->move((desktopWidget->width() - this->width()) / 2, (desktopWidget->height() - this->height()) / 2);
    ui->pushButton_2->disconnect();
    connect(ui->pushButton_2, SIGNAL(clicked()), this, SLOT(showMax()));
}

2.視窗最小化事件

自制QPushButton按鈕，連線到showMin（）事件上

void showMin()
{
    this->showMinimized();
}

3.視窗關閉事件

自制QPushButton按鈕，連線到onButtonCloseClicked（）事件上

void onButtonCloseClicked()
{
    close();
}

4.視窗移動事件

過載 mousePressEvent、mouseMoveEvent、mouseReleaseEvent

void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
bool m_isPressed;
QPoint m_startMovePos;
void mousePressEvent(QMouseEvent *event)
{
    int x = event->pos().x();
    int y = event->pos().y();
    if (x >= 0 && x <= ui.widget->width())
    {
        if (y >= 0 && y <= ui.widget->height())
        {
            m_isPressed = true;
            m_startMovePos = event->pos();
        }
    }
    return QWidget::mousePressEvent(event);
}

void mouseMoveEvent(QMouseEvent *event)
{

    if (m_isPressed)
    {
        QPoint movePoint = event->globalPos();
        //m_startMovePos = event->globalPos();
        this->move(movePoint.x() - m_startMovePos.x(), movePoint.y() - m_startMovePos.y());
    }
    return QWidget::mouseMoveEvent(event);
}

void mouseReleaseEvent(QMouseEvent *event)
{
    m_isPressed = false;
    return QWidget::mouseReleaseEvent(event);
}

邊框陰影、圓角效果

this->setAttribute(Qt::WA_TranslucentBackground);//設定視窗背景透明
過載paintEvent，窗體要在四周留出10的間距，其窗體要設定圓角樣式 border-radius:5px;

void paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);  // 反鋸齒;
    QColor tem;
    tem.setRgb(47, 47, 47);
    painter.setPen(Qt::transparent);
    QRect rect = ui.widget_2->rect();
    rect.setWidth(rect.width() - 1);
    rect.setHeight(rect.height() - 1);
    painter.drawRoundedRect(rect, 10, 10);//繪製圓角
    //繪製陰影
    QPainterPath path;
    path.setFillRule(Qt::WindingFill);
    path.addRect(10, 10, this->width() - 20, this->height() - 20);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.fillPath(path, QBrush(QColor(45, 45, 45)));
    QColor color(0, 0, 0, 50);
    for (int i = 0; i<10; i++)
    {
        QPainterPath path;
        path.setFillRule(Qt::WindingFill);
        path.addRect(10 - i, 10 - i, this->width() - (10 - i) * 2, this->height() - (10 - i) * 2);
        color.setAlpha(150 - sqrt(i) * 50);
        painter.setPen(color);
        painter.drawPath(path);
    }
    QWidget::paintEvent(event);
}