Qt圆角窗口

问题：自己重写了一个窗口，发现用qss设置圆角了，但是都不生效，不过子窗口圆角都生效了。

无边框移动窗口

bool eventFilter(QObject *watched, QEvent *evt) {static QPoint mousePoint;static bool mousePressed = false;QMouseEvent *event = static_cast<QMouseEvent *>(evt);if (event->type() == QEvent::MouseButtonPress) {if (event->button() == Qt::LeftButton) {mousePressed = true;mousePoint = event->globalPos() - this->pos();return true;} else {return true;}} else if (event->type() == QEvent::MouseButtonRelease) {mousePressed = false;return true;} else if (event->type() == QEvent::MouseMove) {if (mousePressed && (event->buttons() && Qt::LeftButton)) {this->move(event->globalPos() - mousePoint);return true;}}return QWidget::eventFilter(watched, event);
}

1.当前窗口背景隐藏，使用子窗口圆角

红色背景为原来的窗口，里面的子窗口可以看到有圆角窗口了，隐藏掉就行setAttribute(Qt::WA_TranslucentBackground);
在这里插入图片描述
实现效果：
窗口还是存在的，只是透明了

代码：

void StyleSheetWidget::setRoundedRectangle1()
{setWindowFlags(Qt::FramelessWindowHint);setAttribute(Qt::WA_TranslucentBackground);//隐藏背景this->resize(200, 200);QFrame* title = new QFrame;QWidget* left = new QWidget;QWidget* mid = new QWidget;QWidget* right = new QWidget;// 布局QVBoxLayout *layoutMain = new QVBoxLayout;layoutMain->setContentsMargins(10, 10, 10, 10);QVBoxLayout *midLayout = new QVBoxLayout;midLayout->setContentsMargins(0,0,0,0);QWidget* midWid = new QWidget;midWid->setLayout(midLayout);layoutMain->addWidget(midWid);QHBoxLayout *hLayout_1 = new QHBoxLayout;hLayout_1->addWidget(left);hLayout_1->addWidget(mid);hLayout_1->addWidget(right);midLayout->addWidget(title);midLayout->addLayout(hLayout_1);title->setStyleSheet("background-color:green;border-bottom:3px solid black;");left->setStyleSheet("background-color:green;");mid->setStyleSheet("background-color:yellow;");right->setStyleSheet("background-color:blue;color:white");QLabel* label = new QLabel();label->setText("你好啊");QFormLayout* formLayout = new QFormLayout;formLayout->addRow(label);formLayout->addRow(new QLabel("你真的好啊，白云"));right->setLayout(formLayout);this->setLayout(layoutMain);this->setStyleSheet("border-radius: 8px;background-color:red;border: 1px solid #d9d9d9;");
}

2.使用paintEvent()绘制圆角

注意：使用paintEvent绘制圆角时候，布局之间要留一点距离，不然上层的绘制会把下面绘制的圆角给遮住了。如：

layoutMain->setContentsMargins(10,10,10,10);

设置布局间距离为10的效果：
在这里插入图片描述
设置为0效果：

    QVBoxLayout *layoutMain = new QVBoxLayout;layoutMain->setContentsMargins(0,0,0,0);

在这里插入图片描述
代码：

void StyleSheetWidget::paintEvent(QPaintEvent *event)
{QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing);painter.setBrush(QColor(255,255,255));      //背景颜色//painter.setPen(Qt::red);//Qt::transparent); //边框颜色QPen pen;pen.setColor(Qt::red);pen.setWidth(3);painter.setPen(pen);QRect rect = this->rect();rect.setWidth(rect.width());rect.setHeight(rect.height());painter.drawRoundedRect(rect, 15, 15);QWidget::paintEvent(event);
}