QT can drag the custom title

MainWindow.cpp
 1 #include "mainwindow.h"
 2 #include "ui_mainwindow.h"
 3 
 4 MainWindow::MainWindow(QWidget *parent) :
 5     QMainWindow(parent),
 6     ui(new Ui::MainWindow)
 7 {
 8     ui->setupUi(this);
 9 
10     setWindowFlags(Qt::FramelessWindowHint);
11     m_bMouseLftBtnPressed = false;
12 }
13 
14 MainWindow::~MainWindow()
15 {
 16      Delete UI;
 . 17  }
 18 is  
. 19  / * --------------------------------------- ------------------------------------
 20  function name: mouseMoveEvent
 21  function: move the mouse event function, in realization of a window inside the function drag function
 22  only to the window drag the left mouse button pressed in the case of
 23  ---------------------- -------------------------------------------------- --- * / 
24  void the MainWindow ::. mouseMoveEvent (QMouseEvent * Event )
 25  {
 26 is      IF ( the this -> isMaximized ()) // if the current is maximized, is not allowed to move 
27          return ;
 28 
29      IF (( Event -> Buttons () :: & leftButton the Qt) && m_bMouseLftBtnPressed) // is depressed the left mouse button 
30      {
 31 is          QPoint ptTemp = Event -> globalPos ();       // current global position of the mouse 
32          ptTemp = ptTemp - m_ptMouseLatestPos;     // calculate a movement variable 
33 is          ptTemp ptTemp + POS = ();                  // window original position (pos ()) + mouse movement variable (ptemp) = the final position of the window 
34 is          move (ptTemp);                             // move the window to a new position 
35  
36          m_ptMouseLatestPos = Event -> globalPos ();     //Record the current position of the mouse click 
37      }
 38  }
 39  
40  
41 is  / * ---------------------------------- -----------------------------------------
 42  function name: mousePressEvent
 43  function: mouse press the button event function within the function to determine whether you can drag the window
 44  only press the left mouse button in the title bar area can drag the current window
 45  --------------- -------------------------------------------------- ---------- * / 
46 is  void the MainWindow :: mousePressEvent (QMouseEvent * Event )
 47  {
 48      the this -> setFocus ();
 49  
50      // only by pressing the left mouse button in the title bar area and the current can drag a maximized window is not the case 
51      IF(Qt :: leftButton == Event -> the Button () && 0 == (Qt :: WindowMaximized & the this -> windowState ()))
 52      {
 53          // just press the left mouse button in the title bar area before they can be drag operation 
54 is          IF (ui-> TitleWidget-> Geometry () the contains (. Event -> POS ()))
 55          {
 56 is              m_ptMouseLatestPos = Event -> globalPos ();        // record the position of the mouse click 
57 is              m_bMouseLftBtnPressed = to true ;    // tag is pressed the mouse 
58              Event -> the ignore ();
 59         }
 60      }
 61  }
 62 is  
63 is  
64  / * ---------------------------------------- -----------------------------------
 65  function name: mouseReleaseEvent
 66  function: the mouse button up event function, within this window function will be canceled drag operation
 67  only considered to be the end of the left mouse button and drag the case raised
 68  --------------------- -------------------------------------------------- ---- * / 
69  void the MainWindow :: mouseReleaseEvent (QMouseEvent * Event )
 70  {
 71 is      IF (the Qt leftButton == :: Event -> Button ())
 72      {
 73 is         m_bMouseLftBtnPressed = false ;
74      }
 75 }

MainWindow.h
 1 #include <QMainWindow>
 2 
 3 namespace Ui {
 4 class MainWindow;
 5 }
 6 
 7 class MainWindow : public QMainWindow
 8 {
 9     Q_OBJECT
10 
11 public:
12     explicit MainWindow(QWidget *parent = 0);
13     ~MainWindow();
14 protected:
15     // 鼠标移动事件函数
16     void mouseMoveEvent(QMouseEvent *event);
 . 17  
18 is      // the mouse button event function 
. 19      void mousePressEvent (QMouseEvent * Event );
 20 is  
21 is      // mouse button up event function 
22 is      void mouseReleaseEvent (QMouseEvent * Event );
 23 is  
24  Private :
 25      Ui :: * the MainWindow ui;
 26      QPoint m_ptMouseLatestPos;       // mouse position of the last 
27      BOOL m_bMouseLftBtnPressed;      // identifies whether the current press the left mouse button 
28  
29 }; 
needs its own drag a window up