void CWnd::OnHelp() // use context to derive help context
{
// attempt to get help from whoever is tracking
HWND hWnd = ::GetCapture();
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
return;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
// attempt to get help from whoever has the focus
hWnd = ::GetFocus();
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
return;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
// attempt to get help from the active window
CWnd* pWnd = GetTopLevelParent();
hWnd = ::GetLastActivePopup(pWnd->GetSafeHwnd());
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
return;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
// No context available, bring up default.
SendMessage(WM_COMMAND, ID_DEFAULT_HELP);
}
void CWnd::OnHelp() // use context to derive help context
{
// attempt to map current context to help topic
CWnd* pWnd = GetTopLevelParent();
HWND hWnd = ::GetLastActivePopup(pWnd->GetSafeHwnd());
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
break;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
if (hWnd == NULL)
{
// No context available, bring up default.
SendMessage(WM_COMMAND, ID_DEFAULT_HELP);
}
}
