balloontip.cpp

一个邮件监控程序

/*

  BalloonTip.cpp


  Crea un cuadro de mensaje que aparece en cualquier parte de un formulario.

*/

#include "stdafx.h"
#include "BalloonTip.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif



/*----------------------------------------------------------------------------
   Message map
----------------------------------------------------------------------------*/

BEGIN_MESSAGE_MAP(CBalloonTip, CFrameWnd)
	//{{AFX_MSG_MAP(CBalloonTip)
	ON_WM_TIMER()
	ON_WM_LBUTTONDOWN()
	ON_WM_RBUTTONDOWN()
	ON_WM_CREATE()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/*-----------------------------------------------------------------------------
 Function : CBalloonTip::CBalloonTip()

 Created: Nov 1, 2001

 Abstract : Constructor

 Parameters : 
    1. strMessage -> Message to be shown in the balloon
    2. lf         -> LOGFONT structure from which the the message font
                     will be created.
    3. bBalloonUp -> Is the balloon up or upside down?
    
 Return Value : none

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

CBalloonTip::CBalloonTip(CString strMessage, LOGFONT lf, BOOL bBalloonUp)
{
  m_strMessage       = strMessage;
  m_bBalloonUp       = bBalloonUp;
  
  VERIFY(m_fontBalloonText.CreateFontIndirect(&lf));
}



/*-----------------------------------------------------------------------------
 Function : CBalloonTip::~CBalloonTip()

 Created: Nov 1, 2001

 Abstract : Destructor

 Parameters : none
    
 Return Value : none

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

CBalloonTip::~CBalloonTip()
{
}




/*-----------------------------------------------------------------------------
 Function : CBalloonTip::Show()

 Created: Nov 1, 2001

 Abstract : Creates the CBalloonTip on the heap, forces heap creation

 Parameters : 
    1. pt -> Point of the balloon tip
    2. size -> Size of the window(width and height)
    3. strMessage -> Message to be shown in the balloon
    4. nSecs -> Seconds for which the balloon will be shown
    5. lf -> LOGFONT structure from which the the message font
             will be created.
    6. bBalloonUp -> Is balloon up or upside down?

 Return Value : void

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

CBalloonTip* CBalloonTip::Show(CWnd* wnd, CString strMessage, UINT nSecs, BOOL bBalloonUp)
{
  LOGFONT lf;
  ::ZeroMemory(&lf, sizeof(lf));
  lf.lfHeight = 16;
  lf.lfWeight = FW_BOLD;
  lf.lfUnderline = FALSE;
  ::strcpy(lf.lfFaceName, _T("Arial"));
  
  // Get the edit box co-ordinates in screen co-ordinates
  CRect rect;
  wnd->GetWindowRect(&rect);
  
  // Point where the balloon will be show, middle of edit box
  CPoint pt = rect.CenterPoint();
  
  return Show(pt, CSize(350, 120), strMessage, lf, nSecs, bBalloonUp);
}

CBalloonTip* CBalloonTip::Show(CPoint pt, CSize size, CString strMessage, LOGFONT lf, UINT nSecs, BOOL bBalloonUp)
{
  if (CBalloonTip::nBalloonInstances != 0) // No window creation if already one instance of the class
  {
    return NULL;
  }
  
  CBalloonTip* pBalloonTip = new CBalloonTip(strMessage, lf, bBalloonUp);
  
  CBalloonTip::nBalloonInstances = 1; // Only one instance of window possible.
  
  UINT nRectLeft;
  UINT nRectRight;
  UINT nRectTop;  
  UINT nRectBottom;
  
  // Rectangle co-ordinates w.r.t balloon tip point
  // Balloon tip at CPoint pt shold remain there without change in window size
  if (bBalloonUp)
  {
    nRectLeft   = pt.x -(size.cx * 0.65);
    nRectRight  = pt.x +(size.cx * 0.35);
    nRectTop    = pt.y - size.cy;
    nRectBottom = pt.y;
  }
  else
  {
    nRectLeft   = pt.x -(size.cx * 0.35);
    nRectRight  = pt.x +(size.cx * 0.65);
    nRectTop    = pt.y;
    nRectBottom = pt.y +(size.cy);
  }
  
  pBalloonTip->Create(CRect(nRectLeft, nRectTop, nRectRight, nRectBottom));    
  pBalloonTip->MakeVisisble(nSecs);
  
  return pBalloonTip;
}





/*-----------------------------------------------------------------------------
 Function : CBalloonTip::MakeVisible()

 Created: Nov 1, 2001

 Abstract : Shows the balloon and sets the timer for it's eventual destruction.

 Parameters : 
    1. nSecs -> Seconds for the balloon to be shown
    
 Return Value : none

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

void CBalloonTip::MakeVisisble(UINT nSecs)
{
  ASSERT(nSecs > 0);
  
  SetTimer(ID_TIMER, (nSecs * 1000), NULL);
  
  CRect rect;
  GetWindowRect(&rect);
  
  // Caption bar height to offeset when the balloon is shown
  int nCaptionBarSize = ::GetSystemMetrics(SM_CYCAPTION);
  int nVerticalBorderSize = ::GetSystemMetrics(SM_CYSIZEFRAME);
  
  if (m_bBalloonUp)
  {
    // Account for the missing title bar and border thickness in the 3rd parameter
    // as the balloon shifts up by the height of title bar and window tickness
    SetWindowPos(
      &wndTopMost,
      m_rectWindow.left, 
      (m_rectWindow.top + nCaptionBarSize +(2 * nVerticalBorderSize)),
      m_rectWindow.right,
      m_rectWindow.bottom, 
      SWP_SHOWWINDOW | SWP_NOACTIVATE
      );
  }
  else
  {
    // Account for the missing title bar and border thickness in the 3rd parameter
    // as the balloon shifts up by the height of window tickness.
    SetWindowPos(
      &wndTopMost, 
      m_rectWindow.left,
      m_rectWindow.top - nVerticalBorderSize,
      m_rectWindow.right, 
      m_rectWindow.bottom,
      SWP_SHOWWINDOW | SWP_NOACTIVATE
      );
  }
}




/*-----------------------------------------------------------------------------
 Function : CBalloonTip::OnTimer()

 Created: Nov 1, 2001

 Abstract : Gets called by MFC for an WM_TIMER message

 Parameters : 
        1. nIDEvent -> Timer ID    

 Return Value : void

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

void CBalloonTip::OnTimer(UINT nIDEvent) 
{
  KillTimer(ID_TIMER);
  DestroyWindow();
}




/*-----------------------------------------------------------------------------
 Function : CBalloonTip::OnLButtonDown()

 Created: Nov 1, 2001

 Abstract : Gets called by MFC for an WM_LBUTTONDOWN message

 Parameters : 
        See MFC documentation

 Return Value : void

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

void CBalloonTip::OnLButtonDown(UINT nFlags, CPoint point) 
{
  KillTimer(ID_TIMER);
  DestroyWindow();
}




/*-----------------------------------------------------------------------------
 Function : CBalloonTip::OnRButtonDown()

 Created: Nov 1, 2001

 Abstract : Gets called by MFC for an WM_RBUTTONDOWN message

 Parameters : 
        See MFC documentation

 Return Value : void

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

void CBalloonTip::OnRButtonDown(UINT nFlags, CPoint point) 
{
  KillTimer(ID_TIMER);
  DestroyWindow();
}




/*-----------------------------------------------------------------------------
 Function : CBalloonTip::OnCreate()

 Created: Nov 1, 2001

 Abstract : Gets called by MFC for an WM_CREATE message

 Parameters : 
        See MFC documentation

 Return Value : int

 Exceptions : none

 Revisions : none
----------------------------------------------------------------------------*/

int CBalloonTip::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{