Qt透明无边框窗口的实现示例

setWindowFlags(Qt::FramelessWindowHint); /* 注意：如果单纯开启窗口透明层效果，在Windows系统中必须设置, 其他系统可忽略。 */setAttribute(Qt::WA_TranslucentBackground);

void paintEvent(QPaintEvent *){  QPainter painter(this);  /* 0x20为透明层颜色，可自定义设置为0x0到0xff */  painter.fillRect(this->rect(), QColor(0, 0, 0, 0x20)); }

void mousePressEvent(QMouseEvent *event){  if (event->button() == Qt::LeftButton) {    /* 捕获按下时坐标 */    m_startPoint = frameGeometry().topLeft() - event->globalPos();  }}void mouseMoveEvent(QMouseEvent *event){  /* 移动窗口 */  this->move(event->globalPos() + m_startPoint);}

#include <QWidget>#include <QVBoxLayout>#include <QPushButton>#include <QPainter>#include <QMouseEvent>class TransparentWidget : public QWidget{  Q_OBJECTpublic:  TransparentWidget(QWidget *parent = 0)    : QWidget(parent)  {    setWindowTitle(QString::fromLocal8Bit("透明无边框窗口"));    setFixedSize(480, 320);    setWindowFlags(Qt::FramelessWindowHint);    setAttribute(Qt::WA_TranslucentBackground);    QPushButton *button = new QPushButton("Hello world!", this);    button->setGeometry(5, 5, 80, 40);  }  void paintEvent(QPaintEvent *)  {    QPainter painter(this);    painter.fillRect(this->rect(), QColor(0, 0, 0, 0x20)); /* 设置透明颜色 */  }  void mousePressEvent(QMouseEvent *event)  {    if (event->button() == Qt::LeftButton) {      m_startPoint = frameGeometry().topLeft() - event->globalPos();    }  }  void mouseMoveEvent(QMouseEvent *event)  {    this->move(event->globalPos() + m_startPoint);  }private:  QPoint m_startPoint;};