qt 界面去掉系统边框

 1 #ifndef customize_qwidget_h
 2 #define customize_qwidget_h
 3 #include <qwidget>
 4 #include <qmouseevent>
 5 
 6 class customizeqwidget : public qwidget
 7 {
 8     q_object
 9 public:
10     explicit customizeqwidget(qwidget *parent = 0);
11     ~customizeqwidget();
12 public slots:
13     void on_button_close_clicked();
14 private:
15     void paintevent(qpaintevent *);
16     void mousepressevent(qmouseevent *event);
17     void mousemoveevent(qmouseevent *event);
18 private:
19     qpoint m_last_mouse_position;
20 };
21 #endif // customize_qwidget_h

 1 #include "customize_qwidget.h"
 2 #include <qstyleoption>
 3 #include <qpainter>
 4 #include <qbrush>
 5 
 6 customizeqwidget::customizeqwidget(qwidget *parent)
 7     : qwidget(parent)
 8 {
 9     this -> setwindowflags(qt::framelesswindowhint);
10 }
11 
12 customizeqwidget::~customizeqwidget()
13 {
14 }
15 
16 void customizeqwidget::paintevent(qpaintevent *)
17 {
18     qstyleoption opt;
19     opt.init(this);
20     qpainter p(this);
21     style()->drawprimitive(qstyle::pe_widget, &opt, &p, this);
22 }
23 
24 void customizeqwidget::mousepressevent(qmouseevent *event)
25 {
26     if(event->button() == qt::leftbutton)
27     {
28         m_last_mouse_position = event->globalpos();
29     }
30 }
31 
32 void customizeqwidget::mousemoveevent(qmouseevent *event)
33 {
34     if (!event->buttons().testflag(qt::leftbutton))
35             return;
36     const qpoint position = pos() + event->globalpos() - m_last_mouse_position; //the position of mainfrmae + (current_mouse_position - last_mouse_position)
37     move(position.x(), position.y());
38     m_last_mouse_position = event->globalpos();
39 }
40 
41 void customizeqwidget::on_button_close_clicked()
42 {
43     this->close();
44 }