QT Qwidget设置窗口无边框，并且可拖动

首先设置无边框

在这里一定要注意的是函数名称是setWindowFlags而不是setWindowFlag，

一字之差可能让你头疼半天为什么边框还在，没效果

1 //设置无边框
2 this->setWindowFlags(Qt::FramelessWindowHint);

然后是拖动功能
.h文件设置

1 #include <QMouseEvent>
2  
3 protected:
4     void mouseMoveEvent(QMouseEvent *event);
5     void mousePressEvent(QMouseEvent *event);
6 void mouseReleaseEvent(QMouseEvent *event);
7 private:
8     QPoint mousePoint;
9     bool mouse_press;

.cpp文件设置

 1 void Softdog::mousePressEvent(QMouseEvent *event)
 2 {
 3  
 4     if( (event->button() == Qt::LeftButton) ){
 5         mouse_press = true;
 6         mousePoint = event->globalPos() - this->pos();
 7 //        event->accept();
 8     }
 9     else if(event->button() == Qt::RightButton){
10         //如果是右键
11         this->close();
12  
13     }
14 }
15 void Softdog::mouseMoveEvent(QMouseEvent *event)
16 {
17  
18  
19 //    if(event->buttons() == Qt::LeftButton){  //如果这里写这行代码，拖动会有点问题
20     if(mouse_press){
21         move(event->globalPos() - mousePoint);
22 //        event->accept();
23     }
24 }
25 void Softdog::mouseReleaseEvent(QMouseEvent *event)
26 {
27     mouse_press = false;
28 }