QT
去除默认边框，为界面添加阴影，实现拖动效果。只是示例，没有完成关闭等按钮，根据具体情况添加，可以使用ui设计画一个。

#include <QApplication>
#include <QWidget>
#include <QPoint>
#include <QMouseEvent>
#include <QGraphicsDropShadowEffect>
#include <QVBoxLayout>class Window:public QWidget
{Q_OBJECT
public:Window(QWidget* parent=nullptr){this->setWindowFlags(Qt::FramelessWindowHint);this->setAttribute(Qt::WA_TranslucentBackground);// this->setContentsMargins(3,5,5,3); /*左上右下*/QGraphicsDropShadowEffect *shadow_effect = new QGraphicsDropShadowEffect(this);shadow_effect->setOffset(0, 0);shadow_effect->setColor(Qt::black);shadow_effect->setBlurRadius(25);QWidget* container = new QWidget(this);container->setFixedSize(480,360);container->setStyleSheet("background-color:red;");container->setGraphicsEffect(shadow_effect);QVBoxLayout *layout = new QVBoxLayout(this);layout->addWidget(container);this->setLayout(layout);}
protected:void mousePressEvent(QMouseEvent *event) override {if (event->button() == Qt::LeftButton) {/* 计算鼠标点击位置相对于窗口内部的偏移量*/m_offset = event->globalPosition().toPoint() - frameGeometry().topLeft();event->accept();}}void mouseMoveEvent(QMouseEvent *event) override {if (event->buttons() & Qt::LeftButton) {/* 移动窗口 */move(event->globalPosition().toPoint() - m_offset);event->accept();}}
private:QPoint m_offset;
};int main(int argc, char *argv[])
{QApplication a(argc, argv);Window w;w.show();return a.exec();
}#include "main.moc"

效果