system~1.cpp

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/////////////////////////////////////////////////////////////////////////////
// SystemTray.cpp : implementation file
//
// MFC VERSION
//
// This is a conglomeration of ideas from the MSJ "Webster" application,
// sniffing round the online docs, and from other implementations such
// as PJ Naughter's "CTrayNotifyIcon" (http://indigo.ie/~pjn/ntray.html)
// especially the "CSystemTray::OnTrayNotification" member function.
// Joerg Koenig suggested the icon animation stuff
//
// This class is a light wrapper around the windows system tray stuff. It
// adds an icon to the system tray with the specified ToolTip text and 
// callback notification value, which is sent back to the Parent window.
//
// The tray icon can be instantiated using either the constructor or by
// declaring the object and creating (and displaying) it later on in the
// program. eg.
//
//        CSystemTray m_SystemTray;    // Member variable of some class
//        
//        ... 
//        // in some member function maybe...
//        m_SystemTray.Create(pParentWnd, WM_MY_NOTIFY, "Click here", 
//                          hIcon, nSystemTrayID);
//
// Written by Chris Maunder ([e-mail])
// Copyright (c) 1998.
//
// Updated: 25 Jul 1998 - Added icon animation, and derived class
//                        from CWnd in order to handle messages. (CJM)
//                        (icon animation suggested by Joerg Koenig.
//                        Added API to set default menu item. Code provided
//                        by Enrico Lelina.
//
// Updated: 6 June 1999 - SetIcon can now load non-standard sized icons (Chip Calvert)
//                        Added "bHidden" parameter when creating icon
//                        (Thanks to Michael Gombar for these suggestions)
//                        Restricted tooltip text to 64 characters.
//
// Updated: 9 Nov 1999  - Now works in WindowsCE.
//                        Fix for use in NT services (Thomas Mooney, TeleProc, Inc)
//                        Added W2K stuff by Michael Dunn
//
// Updated: 1 Jan 2000  - Added tray minimisation stuff.
// 
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is 
// not sold for profit without the authors written consent, and 
// providing that this notice and the authors name is included. If 
// the source code in  this file is used in any commercial application 
// then acknowledgement must be made to the author of this file 
// (in whatever form you wish).
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage caused through use.
//
// Expect bugs.
// 
// Please use and enjoy. Please let me know of any bugs/mods/improvements 
// that you have found/implemented and I will fix/incorporate them into this
// file. 
//
/////////////////////////////////////////////////////////////////////////////
    
#include "stdafx.h"
#include "SystemTray.h"
#include "resource.h"       // main symbols

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

#ifndef _WIN32_WCE  // Use C++ exception handling instead of structured.
#undef TRY
#undef CATCH
#undef END_CATCH
#define TRY try
#define CATCH(ex_class, ex_object) catch(ex_class* ex_object)
#define END_CATCH
#endif  // _WIN32_WCE

#ifndef _countof
#define _countof(x) ( sizeof(x) / sizeof(x[0]) )
#endif

IMPLEMENT_DYNAMIC(CSystemTray, CWnd)

const UINT CSystemTray::m_nTimerID    = 4567;
UINT CSystemTray::m_nMaxTooltipLength  = 64;     // This may change...
const UINT CSystemTray::m_nTaskbarCreatedMsg = ::RegisterWindowMessage(_T("TaskbarCreated"));
CWnd  CSystemTray::m_wndInvisible;


/////////////////////////////////////////////////////////////////////////////
// CSystemTray construction/creation/destruction

CSystemTray::CSystemTray()
{
    Initialise();
}

CSystemTray::CSystemTray(CWnd* pParent,             // The window that will recieve tray notifications
                         UINT uCallbackMessage,     // the callback message to send to parent
                         LPCTSTR szToolTip,         // tray icon tooltip
                         HICON icon,                // Handle to icon
                         UINT uID,                  // Identifier of tray icon
                         BOOL bHidden /*=FALSE*/,   // Hidden on creation?                  
                         LPCTSTR szBalloonTip /*=NULL*/,    // Ballon tip (w2k only)
                         LPCTSTR szBalloonTitle /*=NULL*/,  // Balloon tip title (w2k)
                         DWORD dwBalloonIcon /*=NIIF_NONE*/,// Ballon tip icon (w2k)
                         UINT uBalloonTimeout /*=10*/)      // Balloon timeout (w2k)
{
    Initialise();
    Create(pParent, uCallbackMessage, szToolTip, icon, uID, bHidden,
           szBalloonTip, szBalloonTitle, dwBalloonIcon, uBalloonTimeout);
}

void CSystemTray::Initialise()
{
    memset(&m_tnd, 0, sizeof(m_tnd));

    m_bEnabled = FALSE;
    m_bHidden  = TRUE;
    m_bRemoved = TRUE;

    m_DefaultMenuItemID    = 0;
    m_DefaultMenuItemByPos = TRUE;
	m_bMenuItemSuspendEnabled = TRUE;
	m_bMenuItemGrayed = FALSE;

    m_bShowIconPending = FALSE;

    m_uIDTimer   = 0;
    m_hSavedIcon = NULL;

	m_pTargetWnd = NULL;
	m_uCreationFlags = 0;

#ifdef SYSTEMTRAY_USEW2K
    OSVERSIONINFO os = { sizeof(os) };
    GetVersionEx(&os);
    m_bWin2K = ( VER_PLATFORM_WIN32_NT == os.dwPlatformId && os.dwMajorVersion >= 5 );
#else
    m_bWin2K = FALSE;
#endif
}

// update by Michael Dunn, November 1999
//
//  New version of Create() that handles new features in Win 2K.
//
// Changes:
//  szTip: Same as old, but can be 128 characters instead of 64.
//  szBalloonTip: Text for a balloon tooltip that is shown when the icon
//                is first added to the tray.  Pass "" if you don't want
//                a balloon.
//  szBalloonTitle: Title text for the balloon tooltip.  This text is shown
//                  in bold above the szBalloonTip text.  Pass "" if you
//                  don't want a title.
//  dwBalloonIcon: Specifies which icon will appear in the balloon.  Legal
//                 values are:
//                     NIIF_NONE: No icon
//                     NIIF_INFO: Information
//                     NIIF_WARNING: Exclamation
//                     NIIF_ERROR: Critical error (red circle with X)
//  uBalloonTimeout: Number of seconds for the balloon to remain visible.
//                   Must be between 10 and 30 inclusive.

BOOL CSystemTray::Create(CWnd* pParent, UINT uCallbackMessage, LPCTSTR szToolTip, 
                         HICON icon, UINT uID, BOOL bHidden /*=FALSE*/,
                         LPCTSTR szBalloonTip /*=NULL*/, 
                         LPCTSTR szBalloonTitle /*=NULL*/,  
                         DWORD dwBalloonIcon /*=NIIF_NONE*/,
                         UINT uBalloonTimeout /*=10*/)
{
#ifdef _WIN32_WCE
    m_bEnabled = TRUE;
#else
    // this is only for Windows 95 (or higher)
    m_bEnabled = (GetVersion() & 0xff) >= 4;
    if (!m_bEnabled) 
    {
        ASSERT(FALSE);
        return FALSE;
    }
#endif

    m_nMaxTooltipLength = _countof(m_tnd.szTip);
    
    // Make sure we avoid conflict with other messages
    ASSERT(uCallbackMessage >= WM_APP);

    // Tray only supports tooltip text up to m_nMaxTooltipLength) characters
    ASSERT(AfxIsValidString(szToolTip));
    ASSERT(_tcslen(szToolTip) <= m_nMaxTooltipLength);

    // Create an invisible window
    CWnd::CreateEx(0, AfxRegisterWndClass(0), _T(""), WS_POPUP, 0,0,0,0, NULL, 0);

    // load up the NOTIFYICONDATA structure
    m_tnd.cbSize = sizeof(NOTIFYICONDATA);
    m_tnd.hWnd   = pParent->GetSafeHwnd()? pParent->GetSafeHwnd() : m_hWnd;
    m_tnd.uID    = uID;
    m_tnd.hIcon  = icon;
    m_tnd.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
    m_tnd.uCallbackMessage = uCallbackMessage;
    _tcsncpy(m_tnd.szTip, szToolTip, m_nMaxTooltipLength-1);

#ifdef SYSTEMTRAY_USEW2K
    if (m_bWin2K && szBalloonTip)
    {
        // The balloon tooltip text can be up to 255 chars long.
        ASSERT(AfxIsValidString(szBalloonTip));
        ASSERT(lstrlen(szBalloonTip) < 256);

        // The balloon title text can be up to 63 chars long.
        if (szBalloonTitle)
        {
            ASSERT(AfxIsValidString(szBalloonTitle));
            ASSERT(lstrlen(szBalloonTitle) < 64);
        }

        // dwBalloonIcon must be valid.
        ASSERT(NIIF_NONE == dwBalloonIcon    || NIIF_INFO == dwBalloonIcon ||
               NIIF_WARNING == dwBalloonIcon || NIIF_ERROR == dwBalloonIcon);

        // The timeout must be between 10 and 30 seconds.
        ASSERT(uBalloonTimeout >= 10 && uBalloonTimeout <= 30);

        m_tnd.uFlags |= NIF_INFO;

        _tcsncpy(m_tnd.szInfo, szBalloonTip, 255);
        if (szBalloonTitle)
            _tcsncpy(m_tnd.szInfoTitle, szBalloonTitle, 63);
        else
            m_tnd.szInfoTitle[0] = _T('\0');
        m_tnd.uTimeout    = uBalloonTimeout * 1000; // convert time to ms
        m_tnd.dwInfoFlags = dwBalloonIcon;
    }
#endif

    m_bHidden = bHidden;

#ifdef SYSTEMTRAY_USEW2K    
    if (m_bWin2K && m_bHidden)
    {
        m_tnd.uFlags = NIF_STATE;
        m_tnd.dwState = NIS_HIDDEN;
        m_tnd.dwStateMask = NIS_HIDDEN;
    }
#endif

	m_uCreationFlags = m_tnd.uFlags;	// Store in case we need to recreate in OnTaskBarCreate

    BOOL bResult = TRUE;
    if (!m_bHidden || m_bWin2K)
    {
        bResult = Shell_NotifyIcon(NIM_ADD, &m_tnd);
        m_bShowIconPending = m_bHidden = m_bRemoved = !bResult;
    }
    
#ifdef SYSTEMTRAY_USEW2K    
    if (m_bWin2K && szBalloonTip)
    {
        // Zero out the balloon text string so that later operations won't redisplay
        // the balloon.
        m_tnd.szInfo[0] = _T('\0');
    }
#endif

    return bResult;
}

CSystemTray::~CSystemTray()
{
    RemoveIcon();
    m_IconList.RemoveAll();
    DestroyWindow();
}

/////////////////////////////////////////////////////////////////////////////
// CSystemTray icon manipulation

//////////////////////////////////////////////////////////////////////////
//
// Function:    SetFocus()
//
// Description:
//  Sets the focus to the tray icon.  Microsoft's Win 2K UI guidelines
//  say you should do this after the user dismisses the icon's context
//  menu.
//
// Input:
//  Nothing.
//
// Returns:
//  Nothing.
//
//////////////////////////////////////////////////////////////////////////
// Added by Michael Dunn, November, 1999
//////////////////////////////////////////////////////////////////////////

void CSystemTray::SetFocus()
{
#ifdef SYSTEMTRAY_USEW2K
    Shell_NotifyIcon ( NIM_SETFOCUS, &m_tnd );
#endif
}

BOOL CSystemTray::MoveToRight()
{
    RemoveIcon();
    return AddIcon();
}

BOOL CSystemTray::AddIcon()
{
    if (!m_bRemoved)
        RemoveIcon();

    if (m_bEnabled)
    {
        m_tnd.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
        if (!Shell_NotifyIcon(NIM_ADD, &m_tnd))
            m_bShowIconPending = TRUE;
        else
            m_bRemoved = m_bHidden = FALSE;
    }
    return (m_bRemoved == FALSE);
}

BOOL CSystemTray::RemoveIcon()
{
    m_bShowIconPending = FALSE;

    if (!m_bEnabled || m_bRemoved)
        return TRUE;

    m_tnd.uFlags = 0;
    if (Shell_NotifyIcon(NIM_DELETE, &m_tnd))
        m_bRemoved = m_bHidden = TRUE;

    return (m_bRemoved == TRUE);
}

BOOL CSystemTray::HideIcon()
{
    if (!m_bEnabled || m_bRemoved || m_bHidden)
        return TRUE;

#ifdef SYSTEMTRAY_USEW2K
    if (m_bWin2K)
    {
        m_tnd.uFlags = NIF_STATE;
        m_tnd.dwState = NIS_HIDDEN;
        m_tnd.dwStateMask = NIS_HIDDEN;

        m_bHidden = Shell_NotifyIcon( NIM_MODIFY, &m_tnd);
    }
    else
#endif
        RemoveIcon();

    return (m_bHidden == TRUE);
}

BOOL CSystemTray::ShowIcon()
{
    if (m_bRemoved)
        return AddIcon();

    if (!m_bHidden)
        return TRUE;

#ifdef SYSTEMTRAY_USEW2K
    if (m_bWin2K)
    {
        m_tnd.uFlags = NIF_STATE;
        m_tnd.dwState = 0;
        m_tnd.dwStateMask = NIS_HIDDEN;
        Shell_NotifyIcon ( NIM_MODIFY, &m_tnd );
    }
    else
#endif
        AddIcon();

    return (m_bHidden == FALSE);
}

BOOL CSystemTray::SetIcon(HICON hIcon)
{
    if (!m_bEnabled)
        return FALSE;

    m_tnd.uFlags = NIF_ICON;
    m_tnd.hIcon = hIcon;

    if (m_bHidden)
        return TRUE;
    else
        return Shell_NotifyIcon(NIM_MODIFY, &m_tnd);
}

BOOL CSystemTray::SetIcon(LPCTSTR lpszIconName)
{
    HICON hIcon = (HICON) ::LoadImage(AfxGetResourceHandle(), 
                                      lpszIconName,
                                      IMAGE_ICON, 
                                      0, 0,
                                      LR_DEFAULTCOLOR);

    return SetIcon(hIcon);
}

BOOL CSystemTray::SetIcon(UINT nIDResource)
{
    return SetIcon(MAKEINTRESOURCE(nIDResource));
}

BOOL CSystemTray::SetStandardIcon(LPCTSTR lpIconName)
{
    HICON hIcon = LoadIcon(NULL, lpIconName);

    return SetIcon(hIcon);
}

BOOL CSystemTray::SetStandardIcon(UINT nIDResource)
{
	return SetStandardIcon(MAKEINTRESOURCE(nIDResource));
}
 
HICON CSystemTray::GetIcon() const
{
    return (m_bEnabled)? m_tnd.hIcon : NULL;
}

BOOL CSystemTray::SetIconList(UINT uFirstIconID, UINT uLastIconID) 
{
	if (uFirstIconID > uLastIconID)
        return FALSE;

	const CWinApp* pApp = AfxGetApp();
    if (!pApp)
    {
        ASSERT(FALSE);
        return FALSE;
    }

    m_IconList.RemoveAll();
    TRY {
	    for (UINT i = uFirstIconID; i <= uLastIconID; i++)
		    m_IconList.Add(pApp->LoadIcon(i));
    }
    CATCH(CMemoryException, e)
    {
        e->ReportError();
        e->Delete();
        m_IconList.RemoveAll();
        return FALSE;
    }
    END_CATCH

    return TRUE;
}

BOOL CSystemTray::SetIconList(HICON* pHIconList, UINT nNumIcons)
{
    m_IconList.RemoveAll();

    TRY {
	    for (UINT i = 0; i <= nNumIcons; i++)
		    m_IconList.Add(pHIconList[i]);
    }
    CATCH (CMemoryException, e)
    {
        e->ReportError();
        e->Delete();
        m_IconList.RemoveAll();
        return FALSE;
    }
    END_CATCH

    return TRUE;
}

BOOL CSystemTray::Animate(UINT nDelayMilliSeconds, int nNumSeconds /*=-1*/)
{
    StopAnimation();

    m_nCurrentIcon = 0;
    m_StartTime = COleDateTime::GetCurrentTime();
    m_nAnimationPeriod = nNumSeconds;
    m_hSavedIcon = GetIcon();

	// Setup a timer for the animation
	m_uIDTimer = SetTimer(m_nTimerID, nDelayMilliSeconds, NULL);

    return (m_uIDTimer != 0);
}

BOOL CSystemTray::StepAnimation()