bool wxGUIEventLoop::Dispatch()
{
MSG msg;
if ( !GetNextMessage(&msg) )
return false;
#if wxUSE_THREADS
wxASSERT_MSG( wxThread::IsMain(),
wxT("only the main thread can process Windows messages") );
static bool s_hadGuiLock = true;
static wxMsgList s_aSavedMessages;
// if a secondary thread owning the mutex is doing GUI calls, save all
// messages for later processing - we can't process them right now because
// it will lead to recursive library calls (and we're not reentrant)
if ( !wxGuiOwnedByMainThread() )
{
s_hadGuiLock = false;
// leave out WM_COMMAND messages: too dangerous, sometimes
// the message will be processed twice
if ( !wxIsWaitingForThread() || msg.message != WM_COMMAND )
{
MSG* pMsg = new MSG(msg);
s_aSavedMessages.Append(pMsg);
}
return true;
}
else
{
// have we just regained the GUI lock? if so, post all of the saved
// messages
//
// FIXME of course, it's not _exactly_ the same as processing the
// messages normally - expect some things to break...
if ( !s_hadGuiLock )
{
s_hadGuiLock = true;
wxMsgList::compatibility_iterator node = s_aSavedMessages.GetFirst();
while (node)
{
MSG* pMsg = node->GetData();
s_aSavedMessages.Erase(node);
ProcessMessage(pMsg);
delete pMsg;
node = s_aSavedMessages.GetFirst();
}
}
}
#endif // wxUSE_THREADS
ProcessMessage(&msg);
return true;
}
bool wxEventLoop::Dispatch()
{
wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") );
MSG msg;
BOOL rc = ::GetMessage(&msg, (HWND) NULL, 0, 0);
if ( rc == 0 )
{
// got WM_QUIT
return false;
}
if ( rc == -1 )
{
// should never happen, but let's test for it nevertheless
wxLogLastError(wxT("GetMessage"));
// still break from the loop
return false;
}
#if wxUSE_THREADS
wxASSERT_MSG( wxThread::IsMain(),
wxT("only the main thread can process Windows messages") );
static bool s_hadGuiLock = true;
static wxMsgList s_aSavedMessages;
// if a secondary thread owning the mutex is doing GUI calls, save all
// messages for later processing - we can't process them right now because
// it will lead to recursive library calls (and we're not reentrant)
if ( !wxGuiOwnedByMainThread() )
{
s_hadGuiLock = false;
// leave out WM_COMMAND messages: too dangerous, sometimes
// the message will be processed twice
if ( !wxIsWaitingForThread() || msg.message != WM_COMMAND )
{
MSG* pMsg = new MSG(msg);
s_aSavedMessages.Append(pMsg);
}
return true;
}
else
{
// have we just regained the GUI lock? if so, post all of the saved
// messages
//
// FIXME of course, it's not _exactly_ the same as processing the
// messages normally - expect some things to break...
if ( !s_hadGuiLock )
{
s_hadGuiLock = true;
wxMsgList::compatibility_iterator node = s_aSavedMessages.GetFirst();
while (node)
{
MSG* pMsg = node->GetData();
s_aSavedMessages.Erase(node);
ProcessMessage(pMsg);
delete pMsg;
node = s_aSavedMessages.GetFirst();
}
}
}
#endif // wxUSE_THREADS
ProcessMessage(&msg);
return true;
}