Re: Gray out a system tray menu entry.

"AliR \(VC++ MVP\)" <AliR@online.nospam>
Tue, 10 Jun 2008 14:49:31 -0500
You didn't provide enough info about your problem! We were just taking shots
in the dark on different ways of solving the problem. How did we know that
you were using a helper class for your tray icon. Tray icons are a simple
thing to manage, why would you need a helper class.

For non-MFC stuff you need to do what Ajay suggested, EnableMenuItem!

You need to call EnableMenuItem on the menu item you want to disable
between the call to LoadMenu and TrackPopupMenu.

Or rewrite the helper class to use MFC, and use ON_UPDATE_COMMAND_UI!


"TonyG" <> wrote in message

Your suggestions don't help me.

Years ago I picked up a system tray helper class from somewhere. I've used
it in a bunch of programs and enhanced it a couple of times. I'd rather
modify the existing class then switch to a different class. In this case I
want to be able to include a grayed out menu item.

The class is actually two classes. The base class I just link in. I then
instantiate the inherited class and make some modifications in the
inherited class and everything works.

The class does NOT use MFC command routing. Instead I believe it creates a
window and uses the WindowProc shown below. If the message is a certain
type it calls OnTrayNotification which is also shown below. Within
OnTrayNotification is a call to CustomizeMenu which clears the menu and
then calls ::AppendMenu a bunch of times to add menu entries. I have
tried setting the flags in ::AppendMenu to make a grayed out entry, but
the system seems to ignore the gray out flag and makes the menu entry full

Is there some other method or place where I can tell the system to gray
out a system tray menu entry?

// This is the global (static) callback function for all TrayIcon windows
LRESULT PASCAL ZPsiSystemTray::WindowProc(HWND hWnd, UINT message, WPARAM
wParam, LPARAM lParam)
    // The option here is to maintain a list of all TrayIcon windows,
    // and iterate through them. If you do this, remove these 3 lines.
    ZPsiSystemTray* pTrayIcon = m_pThis;
    if (pTrayIcon->GetSafeHwnd() != hWnd)
        return ::DefWindowProc(hWnd, message, wParam, lParam);

    // If maintaining a list of TrayIcon windows, then the following...
    // pTrayIcon = GetFirstTrayIcon()
    // while (pTrayIcon != NULL)
    // {
    // if (pTrayIcon->GetSafeHwnd() != hWnd) continue;

          // Taskbar has been recreated - all TrayIcons must process this.
          if (message == ZPsiSystemTray::m_nTaskbarCreatedMsg)
              return pTrayIcon->OnTaskbarCreated(wParam, lParam);

          // Animation timer
          if (message == WM_TIMER && wParam == pTrayIcon->GetTimerID())
              return pTrayIcon->OnTimer(wParam);

          // Settings changed
          if (message == WM_SETTINGCHANGE && wParam ==
              return pTrayIcon->OnSettingChange(wParam, (LPCTSTR) lParam);

          // Is the message from the icon for this TrayIcon?
          if (message == pTrayIcon->GetCallbackMessage())
              return pTrayIcon->OnTrayNotification(wParam, lParam);

    // pTrayIcon = GetNextTrayIcon();
    // }

    // Message has not been processed, so default.
    return ::DefWindowProc(hWnd, message, wParam, lParam);


LRESULT ZPsiSystemTray::OnTrayNotification(UINT wParam, LONG lParam)
   //Return quickly if its not for this tray icon
   if (wParam != m_tnd.uID)
      return 0L;

   HWND hTargetWnd = GetTargetWnd();
   if (!hTargetWnd)
      return 0L;

   // Clicking with right button brings up a context menu
#if defined(_WIN32_WCE) //&& _WIN32_WCE < 211
   BOOL bAltPressed = ((GetKeyState(VK_MENU) & (1 << (sizeof(SHORT)*8-1)))
!= 0);
   if (LOWORD(lParam) == WM_LBUTTONUP && bAltPressed)
   if (LOWORD(lParam) == WM_RBUTTONUP)
      HMENU hMenu = ::LoadMenu(m_hInstance, MAKEINTRESOURCE(m_tnd.uID));
      if (!hMenu)
         return 0;

      HMENU hSubMenu = ::GetSubMenu(hMenu, 0);
      if (!hSubMenu)
         ::DestroyMenu(hMenu); //Be sure to Destroy Menu Before
         return 0;

      // customize the menu
      // check if the menu should be displayed
      // true = indicataes normal processing
      // false = menu is not displayed or activated
      // this allows the host to shut down the menu if desired
      if (true == CustomizeMenu(hSubMenu))
#ifndef _WIN32_WCE
         // Make chosen menu item the default (bold font)
         ::SetMenuDefaultItem(hSubMenu, m_DefaultMenuItemID,

         // Display and track the popup menu
         POINT pos;
#ifdef _WIN32_WCE
         DWORD messagepos = ::GetMessagePos();
     pos.x = GET_X_LPARAM(messagepos);
      pos.y = GET_Y_LPARAM(messagepos);


         ::TrackPopupMenu(hSubMenu, 0, pos.x, pos.y, 0, hTargetWnd, NULL);

         // Required. Read manual page for TrackPopupMenu for details.
         ::PostMessage(m_tnd.hWnd, WM_NULL, 0, 0);

      // destroy the menu

#if defined(_WIN32_WCE) //&& _WIN32_WCE < 211
   if (LOWORD(lParam) == WM_LBUTTONDBLCLK && bAltPressed)
   else if (LOWORD(lParam) == WM_LBUTTONDBLCLK)
      // double click received, the default action is to execute default
menu item

      UINT uItem;
      if (m_DefaultMenuItemByPos)
         HMENU hMenu = ::LoadMenu(m_hInstance,
         if (!hMenu)
            return 0;

         HMENU hSubMenu = ::GetSubMenu(hMenu, 0);
         if (!hSubMenu)
            return 0;
         uItem = ::GetMenuItemID(hSubMenu, m_DefaultMenuItemID);

         uItem = m_DefaultMenuItemID;

      ::PostMessage(hTargetWnd, WM_COMMAND, uItem, 0);

   return 1;

Ajay Kalra wrote:

On Jun 10, 12:20 am, TonyG <> wrote:

Where do I use EnableMenuItem? I placed it near my AppendMenu and it
didn't work. It is as if the
system is enabling all menu items.

How can I make this work?

Ajay Kalra wrote:

Use EnableMenuItem to enable/disable the menu item.
"TonyG" <> wrote in message

How do I gray out an entry in a system tray menu?
When I call ::append menu I have tried to set MF_GRAYED and it didn't
work. Can I make an entry gray? Perhaps is there some message I should
trap in my WindowProc?
Is there something else I should do?

If this menu is part of MFC's command routing, you will need to use
ON_UPDATE_COMMAN_UI mecahism as shown by AliR, otherwise
EnableMenuItem should work. Please show your code if its not working.


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