用鼠标手势动作来发送命令

在一些比较不错的浏览器中,出现了一些新的功能,通过鼠标动作(也称鼠标手势Mouse Gestures)来发出一些命令,比如opera,myie2.一般是这样,先按住鼠标右键,不要松,然后画直线或者其他设定的路径,就可以完成指定的命令。下面我们就来实现这个功能,具体的核心代码来自共享软件联盟小树冲浪浏览器中,整理改编了其中的一些地方。


1.建立一个对话框程序,声明以下变量和函数

 BOOL m_bIsCapture;//一个标志变量

 char m_MouseGestures[4], m_SeqMG[4];//用来保存鼠标动作的代码U(上) D(下)等..

 int m_iMGLen;

 int m_iMouseGS, m_iMouseGE; 

 POINT  m_StartPoint;  //鼠标的坐标点



 BOOL MoveDirection(CPoint& point, char* Direction); //判断鼠标的简单动作,四个,上下左右

 void PushMouseGesture(char gesture);//把鼠标动作的代码保存起来           

 if( nFlags == MK_RBUTTON) //判断时候鼠标右键按下

 {   

   if (m_bIsCapture)   //初始的值的TRUE, 只有当第一点的时候发生里面的动作

               {

         m_bIsCapture=FALSE;

            SetCapture(); //捕获鼠标

      m_StartPoint = point; //记录初始坐标点

              }

  char dir; 

  if(MoveDirection(point, &dir))      //调用函数

  {

   PushMouseGesture(dir);

   m_StartPoint = point;

  }

 }

  CDialog::OnMouseMove(nFlags, point);

} 

BOOL Cmouse2Dlg::MoveDirection(CPoint &point, char *Direction)

{

 int x = point.x - m_StartPoint.x;

 int y = point.y - m_StartPoint.y;

 int dist = x*x+y*y;         

 if(dist>64)

 {

  if(x>abs(y) && x>0)

   *Direction = RBUT_RIGHT;

  else if(abs(x)>abs(y) && x<0)

   *Direction = RBUT_LEFT;

  else if(y>abs(x) && y>0)

   *Direction = RBUT_DOWN;

  else if(abs(y)>abs(x) && y<0)

   *Direction = RBUT_UP; 

  else

   return FALSE;

  return TRUE;

 }

 else

  return FALSE;

}

if(m_iMouseGE!=0 || m_iMouseGS !=0)  //m_iMouseGS和m_iMouseGE初始为0

 {

  int pre = (m_iMouseGE -1 + m_iMGLen)m_iMGLen;  

  if(m_MouseGestures[pre] == gesture)

   return;

 }

 m_MouseGestures[m_iMouseGE] = gesture;

 m_iMouseGE = (m_iMouseGE+1)m_iMGLen;

 if(m_iMouseGS == m_iMouseGE)

  m_iMouseGS = (m_iMouseGS + 1)m_iMGLen;

if(!m_bIsCapture)     //看标志变量,是否触发了鼠标动作

 { m_bIsCapture=TRUE;

  ReleaseCapture(); 



  int i =0; m_SeqMG[0]= ''\0'';

  while(m_iMouseGE != m_iMouseGS)   //将鼠标动作保存到m_SeqMG中,并在最后加上\0

  {

   m_SeqMG[i] = m_MouseGestures[m_iMouseGS];

   i++;

   m_SeqMG[i] = ''\0'';

   m_iMouseGS = (m_iMouseGS +1)m_iMGLen;  

  }



  if(i>0)          //开始比较鼠标动作,在这里可以加上自定义的动作和命令!

  {

   if(strcmp(m_SeqMG, "D")==0)

     m_mouse="Down";

   else if(strcmp(m_SeqMG, "L")==0)

     m_mouse="Left";

   else if(strcmp(m_SeqMG, "U")==0)

     m_mouse="Up";

   else if(strcmp(m_SeqMG, "R")==0)

     m_mouse="Right";

   else if(strcmp(m_SeqMG, "UD")==0)

     m_mouse="Up Down";

   else if(strcmp(m_SeqMG, "RLR")==0)

     m_mouse="Right Left Right";

   else if(strcmp(m_SeqMG, "UL")==0)

      m_mouse="Up Left";

   else if(strcmp(m_SeqMG, "UR")==0)

      m_mouse="Up Right";

   else {

    m_mouse="";

    i = 0;

       }

  }

 UpdateData(FALSE);

 }