balloonhelp.cpp

实时监控

      sizeHdr.cx += nBtnWidth;
      sizeHdr.cy = max(sizeHdr.cy, ::GetSystemMetrics(SM_CYSIZE));
      if (bDraw)
         pDC->DrawFrameControl(CRect(rectClient.right-nBtnWidth,0,rectClient.right,::GetSystemMetrics(SM_CYSIZE)), DFC_CAPTION, DFCS_CAPTIONCLOSE|DFCS_FLAT);
      rectClient.right -= nBtnWidth;
   }

   // calc title size
   CString strTitle;
   GetWindowText(strTitle);
   if ( !strTitle.IsEmpty() )
   {
      CFont* pOldFont = pDC->SelectObject(m_pTitleFont);

      // if something is already in the header (icon or close button) leave space
      if ( sizeHdr.cx > 0 ) 
         sizeHdr.cx += nTIP_MARGIN;
      CRect rectTitle(0,0,0,0);
      pDC->DrawText(strTitle, &rectTitle, DT_CALCRECT | DT_NOPREFIX | DT_EXPANDTABS | DT_SINGLELINE);
      sizeHdr.cx += rectTitle.Width();
      sizeHdr.cy = max(sizeHdr.cy, rectTitle.Height());

      // draw title
      if ( bDraw )
      {
         pDC->SetBkMode(TRANSPARENT);
         pDC->SetTextColor(m_crForeground);
         pDC->DrawText(strTitle, &rectClient, DT_CENTER | DT_NOPREFIX  | DT_EXPANDTABS | DT_SINGLELINE);
      }

      // cleanup
      pDC->SelectObject(pOldFont);
   }

   return sizeHdr;
}

// Calculate the dimensions and draw the balloon contents
CSize CBalloonHelp::DrawContent(CDC* pDC, int nTop, bool bDraw)
{
   CRect rectContent;
   GetAnchorScreenBounds(rectContent);
   rectContent.OffsetRect(-rectContent.left, -rectContent.top);
   rectContent.top = nTop;

   // limit to half screen width
   rectContent.right -= rectContent.Width()/2;

   // calc size
   CFont* pOldFont = pDC->SelectObject(m_pContentFont);
   if ( !m_strContent.IsEmpty() )
      pDC->DrawText(m_strContent, &rectContent, DT_CALCRECT | DT_LEFT | DT_NOPREFIX | DT_EXPANDTABS | DT_WORDBREAK);
   else
      rectContent.SetRectEmpty();   // don't want to leave half the screen for empty strings ;)
   
   // draw
   if (bDraw)
   {
      pDC->SetBkMode(TRANSPARENT);
      pDC->SetTextColor(m_crForeground);
      pDC->DrawText(m_strContent, &rectContent, DT_LEFT | DT_NOPREFIX | DT_WORDBREAK | DT_EXPANDTABS);
   }

   // cleanup
   pDC->SelectObject(pOldFont);

   return rectContent.Size();
}

// calculates the client size necessary based on title and content
CSize CBalloonHelp::CalcClientSize()
{
   ASSERT(NULL != m_hWnd);
   CWindowDC dc(this);

   CSize sizeHeader = CalcHeaderSize(&dc);
   CSize sizeContent = CalcContentSize(&dc);

   return CSize(max(sizeHeader.cx,sizeContent.cx), sizeHeader.cy + nTIP_MARGIN + sizeContent.cy);
}

// calculates the size for the entire window based on content size
CSize CBalloonHelp::CalcWindowSize()
{
   CSize size = CalcClientSize();
   size.cx += nTIP_MARGIN*2;
   size.cy += nTIP_TAIL+nTIP_MARGIN*2;
   //size.cx = max(size.cx, nTIP_MARGIN*2+nTIP_TAIL*4);
   return size;
}


// this routine calculates the size and position of the window relative
// to it's anchor point, and moves the window accordingly.  The region is also
// created and set here.
void CBalloonHelp::PositionWindow()
{
   CSize sizeWnd = CalcWindowSize();

   CPoint ptTail[3];
   CPoint ptTopLeft(0,0);
   CPoint ptBottomRight(sizeWnd.cx, sizeWnd.cy);

   // force recalculation of desktop
   m_screenRect.SetRectEmpty();

   switch (GetBalloonQuadrant())
   {
   case BQ_TOPLEFT:
      ptTopLeft.y = nTIP_TAIL;
      ptTail[0].x = (sizeWnd.cx-nTIP_TAIL)/4 + nTIP_TAIL;
      ptTail[0].y = nTIP_TAIL+1;
      ptTail[2].x = (sizeWnd.cx-nTIP_TAIL)/4;
      ptTail[2].y = ptTail[0].y;
      ptTail[1].x = ptTail[2].x;
      ptTail[1].y = 1;
      break;
   case BQ_TOPRIGHT:
      ptTopLeft.y = nTIP_TAIL;
      ptTail[0].x = (sizeWnd.cx-nTIP_TAIL)/4*3;
      ptTail[0].y = nTIP_TAIL+1;
      ptTail[2].x = (sizeWnd.cx-nTIP_TAIL)/4*3 + nTIP_TAIL;
      ptTail[2].y = ptTail[0].y;
      ptTail[1].x = ptTail[2].x;
      ptTail[1].y = 1;
      break;
   case BQ_BOTTOMLEFT:
      ptBottomRight.y = sizeWnd.cy-nTIP_TAIL;
      ptTail[0].x = (sizeWnd.cx-nTIP_TAIL)/4 + nTIP_TAIL;
      ptTail[0].y = sizeWnd.cy-nTIP_TAIL-2;
      ptTail[2].x = (sizeWnd.cx-nTIP_TAIL)/4;
      ptTail[2].y = ptTail[0].y;
      ptTail[1].x = ptTail[2].x;
      ptTail[1].y = sizeWnd.cy-2;
      break;
   case BQ_BOTTOMRIGHT:
      ptBottomRight.y = sizeWnd.cy-nTIP_TAIL;
      ptTail[0].x = (sizeWnd.cx-nTIP_TAIL)/4*3;
      ptTail[0].y = sizeWnd.cy-nTIP_TAIL-2;
      ptTail[2].x = (sizeWnd.cx-nTIP_TAIL)/4*3 + nTIP_TAIL;
      ptTail[2].y = ptTail[0].y;
      ptTail[1].x = ptTail[2].x;
      ptTail[1].y = sizeWnd.cy-2;
      break;
   }

   // adjust for very narrow balloons
   if ( ptTail[0].x < nTIP_MARGIN )
      ptTail[0].x = nTIP_MARGIN;
   if ( ptTail[0].x > sizeWnd.cx - nTIP_MARGIN )
      ptTail[0].x = sizeWnd.cx - nTIP_MARGIN;
   if ( ptTail[1].x < nTIP_MARGIN )
      ptTail[1].x = nTIP_MARGIN;
   if ( ptTail[1].x > sizeWnd.cx - nTIP_MARGIN )
      ptTail[1].x = sizeWnd.cx - nTIP_MARGIN;
   if ( ptTail[2].x < nTIP_MARGIN )
      ptTail[2].x = nTIP_MARGIN;
   if ( ptTail[2].x > sizeWnd.cx - nTIP_MARGIN )
      ptTail[2].x = sizeWnd.cx - nTIP_MARGIN;

   // get window position
   CPoint ptAnchor = GetAnchorPoint();
   CPoint ptOffs(ptAnchor.x - ptTail[1].x, ptAnchor.y - ptTail[1].y);

   // adjust position so all is visible
   CRect rectScreen;
   GetAnchorScreenBounds(rectScreen);
   int nAdjustX = 0;
   int nAdjustY = 0;
   if ( ptOffs.x < rectScreen.left )
      nAdjustX = rectScreen.left-ptOffs.x;
   else if ( ptOffs.x + sizeWnd.cx >= rectScreen.right )
      nAdjustX = rectScreen.right - (ptOffs.x + sizeWnd.cx);
   if ( ptOffs.y + nTIP_TAIL < rectScreen.top )
      nAdjustY = rectScreen.top - (ptOffs.y + nTIP_TAIL);
   else if ( ptOffs.y + sizeWnd.cy - nTIP_TAIL >= rectScreen.bottom )
      nAdjustY = rectScreen.bottom - (ptOffs.y + sizeWnd.cy - nTIP_TAIL);

   // reposition tail
   // uncomment two commented lines below to move entire tail 
   // instead of just anchor point

   //ptTail[0].x -= nAdjustX;
   ptTail[1].x -= nAdjustX;
   //ptTail[2].x -= nAdjustX;
   ptOffs.x    += nAdjustX;
   ptOffs.y    += nAdjustY;

   // place window
   MoveWindow(ptOffs.x, ptOffs.y, sizeWnd.cx, sizeWnd.cy, TRUE);

   // apply region
   CRgn region;
   CRgn regionRound;
   CRgn regionComplete;
   region.CreatePolygonRgn(&ptTail[0], 3, ALTERNATE);
   regionRound.CreateRoundRectRgn(ptTopLeft.x,ptTopLeft.y,ptBottomRight.x,ptBottomRight.y,nTIP_MARGIN*3,nTIP_MARGIN*3);
   regionComplete.CreateRectRgn(0,0,1,1);
   regionComplete.CombineRgn(&region, &regionRound, RGN_OR);

   if ( NULL == m_rgnComplete.m_hObject )
      m_rgnComplete.CreateRectRgn(0,0,1,1);

   if ( !m_rgnComplete.EqualRgn(&regionComplete) )
   {
      m_rgnComplete.CopyRgn(&regionComplete);
      SetWindowRgn((HRGN)regionComplete.Detach(), TRUE);

      // There is a bug with layered windows and NC changes in Win2k
      // As a workaround, redraw the entire window if the NC area changed.
      // Changing the anchor point is the ONLY thing that will change the
      // position of the client area relative to the window during normal
      // operation.
      RedrawWindow(NULL, NULL, RDW_UPDATENOW| RDW_ERASE | RDW_INVALIDATE | RDW_FRAME | RDW_ALLCHILDREN);
   }
}



// Returns the class ATOM for a BalloonHelp control.  Registers the class first, if necessary.
ATOM CBalloonHelp::GetClassAtom(BOOL bShadowed)
{
   if ( NULL == s_ClassAtom )
   {
      WNDCLASSEX wcx; 

      // Fill in the window class structure with parameters 
      // that describe the main window. 

      wcx.cbSize = sizeof(wcx);                 // size of structure 
      wcx.style = CS_DBLCLKS|CS_SAVEBITS
         |CS_DROPSHADOW;                        // notify of double clicks, save screen under, show dropshadow
      wcx.lpfnWndProc = AfxWndProc;             // points to window procedure 
      wcx.cbClsExtra = 0;                       // no extra class memory 
      wcx.cbWndExtra = 0;                       // no extra window memory 
      wcx.hInstance = AfxGetInstanceHandle();   // handle to instance 
      wcx.hIcon = NULL;                         // no app. icon 
      wcx.hCursor = LoadCursor(NULL,IDC_ARROW); // predefined arrow 
      wcx.hbrBackground = ::GetSysColorBrush(COLOR_WINDOW);                 // no background brush 
      wcx.lpszMenuName =  NULL;                 // no menu resource 
      wcx.lpszClassName = _T("BalloonHelpClassDS"); // name of window class 
      wcx.hIconSm = NULL;                       // no small class icon

      // Register the window class (this may not work if dropshadows are not supported)
      s_ClassAtomShadowed = RegisterClassEx(&wcx);

      // Register shadow-less class
      wcx.style &= ~CS_DROPSHADOW;
      wcx.lpszClassName = _T("BalloonHelpClass");
      s_ClassAtom = RegisterClassEx(&wcx);
   }

   if ( bShadowed && NULL != s_ClassAtomShadowed )
      return s_ClassAtomShadowed;
   return s_ClassAtom;
}


// Displays the balloon on the screen, performing fade-in if enabled.
void CBalloonHelp::ShowBalloon(void)
{
   ShowWindow(SW_SHOWNOACTIVATE);
   if ( !(m_unOptions&unDELAY_CLOSE) )
      SetTimeout(m_unTimeout);     // start close timer
}
// Removes the balloon from the screen, performing the fade-out if enabled
void CBalloonHelp::HideBalloon(void)
{
   if ( m_unOptions&unDELAY_CLOSE )
   {
      m_unOptions &= ~(unDELAY_CLOSE|unCLOSE_ON_ANYTHING);  // close only via timer or button
      SetTimeout(m_unTimeout);     // start close timer
      return;
   }
   ShowWindow( SW_HIDE );
   if ( GetCapture() == this ) 
      ReleaseCapture();
   DestroyWindow();
}

//
// Keyboard hook
//

void CBalloonHelp::SetKeyboardHook()
{
   if ( NULL==m_hKeyboardHook )
   {
      m_hKeyboardHook = ::SetWindowsHookEx(WH_KEYBOARD,
         (HOOKPROC)BHKeybHookThunk<CBalloonHelp>::GetThunk(),
         NULL, ::GetCurrentThreadId());
   }
}

void CBalloonHelp::RemoveKeyboardHook()
{
   if ( NULL!=m_hKeyboardHook )
   {
      ::UnhookWindowsHookEx(m_hKeyboardHook);
      m_hKeyboardHook=NULL;
   }
}


//
// Mouse hook
//

void CBalloonHelp::SetMouseHook()
{
   if ( NULL==m_hMouseHook )
   {
      m_hMouseHook = ::SetWindowsHookEx(WH_MOUSE,
         (HOOKPROC)BHMouseHookThunk<CBalloonHelp>::GetThunk(),
         NULL, ::GetCurrentThreadId());
   }
}

void CBalloonHelp::RemoveMouseHook()
{
   if ( NULL!=m_hMouseHook )
   {
      ::UnhookWindowsHookEx(m_hMouseHook);
      m_hMouseHook=NULL;
   }
}

//
// Call Window Return hook
//

void CBalloonHelp::SetCallWndRetHook()
{
   if ( NULL==m_hCallWndRetHook )
   {
      m_hCallWndRetHook = ::SetWindowsHookEx(WH_CALLWNDPROCRET,
         (HOOKPROC)BHCallWndRetHookThunk<CBalloonHelp>::GetThunk(),
         NULL, ::GetCurrentThreadId());
   }
}

void CBalloonHelp::RemoveCallWndRetHook()
{
   if ( NULL!=m_hCallWndRetHook )
   {
      ::UnhookWindowsHookEx(m_hCallWndRetHook);
      m_hCallWndRetHook=NULL;
   }
}


/////////////////////////////////////////////////////////////////////////////
// CBalloonHelp message handlers

BEGIN_MESSAGE_MAP(CBalloonHelp, CWnd)
   ON_WM_ERASEBKGND()
   ON_WM_PAINT()
   ON_WM_NCPAINT()
   ON_WM_LBUTTONDOWN()
   ON_WM_LBUTTONUP()
   ON_WM_NCCALCSIZE()