message.c

libminigui-1.3.0.tar.gz。 miniGUI的库函数源代码！

            if (pMsgQueue->dwState & (0x01 << slot))
                break;
        }

        if (slot == DEF_NR_TIMERS) {
            pMsgQueue->dwState &= ~QS_TIMER;
            pthread_mutex_unlock (&pMsgQueue->lock);
        }
        else {
            pMsg->hwnd = pMsgQueue->TimerOwner[slot];
            pMsg->message = MSG_TIMER;
            pMsg->wParam = pMsgQueue->TimerID[slot];
            pMsg->lParam = 0;
            pMsg->pAdd = NULL;

            pMsgQueue->dwState &= ~(0x01 << slot);
            pthread_mutex_unlock (&pMsgQueue->lock);

            return 1;
        }
    }

    // no message, wait again.
    sem_wait (&pMsgQueue->wait);
    goto checkagain;

    return 1;
}

int GUIAPI ThrowAwayMessages (HWND hWnd)
{
    PMSG        pMsg;
    PMSGQUEUE   pMsgQueue;
    PQMSG       pQMsg;
    PSYNCMSG    pSyncMsg;
    int         nCount = 0;
    int         readpos;

    if( !(pMsgQueue = GetMsgQueue(hWnd)) ) return ERR_INV_HWND;

    pthread_mutex_lock (&pMsgQueue->lock);

    if (pMsgQueue->pFirstNotifyMsg) {
        pQMsg = pMsgQueue->pFirstNotifyMsg;
        
        while (pQMsg) {
            pMsg = &pQMsg->Msg;

            if (pMsg->hwnd == hWnd
                    || GetMainWindowPtrOfControl (pMsg->hwnd) == (PMAINWIN)hWnd) {
                pMsg->hwnd = HWND_INVALID;
                nCount ++;
            }

            pQMsg = pQMsg->next;
        }
    }

    /* FIXME: notify the waiting window */
    if (pMsgQueue->pFirstSyncMsg) {
        pSyncMsg = pMsgQueue->pFirstSyncMsg;
        
        while (pSyncMsg) {
            pMsg = &pSyncMsg->Msg;

            if (pMsg->hwnd == hWnd
                    || GetMainWindowPtrOfControl (pMsg->hwnd) == (PMAINWIN)hWnd) {
                pMsg->hwnd = HWND_INVALID;
                nCount ++;
            }

            pSyncMsg = pSyncMsg->pNext;
        }
    }

    readpos = pMsgQueue->readpos;
    while (readpos != pMsgQueue->writepos) {
        pMsg = pMsgQueue->msg + readpos;

        if (pMsg->hwnd == hWnd
                || GetMainWindowPtrOfControl (pMsg->hwnd) == (PMAINWIN)hWnd) {
            pMsg->hwnd = HWND_INVALID;
            nCount ++;
        }
        
        readpos++;
        if (readpos >= pMsgQueue->len) 
            readpos = 0;
    }

    pthread_mutex_unlock (&pMsgQueue->lock);

    return nCount;
}

BOOL GUIAPI PeekPostMessage (PMSG pMsg, HWND hWnd, int iMsgFilterMin, 
                        int iMsgFilterMax, UINT uRemoveMsg)
{
    PMSGQUEUE pMsgQueue;
    PMSG pPostMsg;
    
    if( !(pMsgQueue = GetMsgQueue(hWnd)) ) return FALSE;

    memset (pMsg, 0, sizeof(MSG));

    if (pMsgQueue->dwState & QS_POSTMSG) {
    
        pthread_mutex_lock (&pMsgQueue->lock);
        if (pMsgQueue->readpos != pMsgQueue->writepos) {

            pPostMsg = pMsgQueue->msg + pMsgQueue->readpos;

            if (iMsgFilterMin == 0 && iMsgFilterMax == 0)
                *pMsg = *pPostMsg;
            else if (pPostMsg->message <= iMsgFilterMax &&
                    pPostMsg->message >= iMsgFilterMin)
                *pMsg = *pPostMsg;
            else {
                pthread_mutex_unlock (&pMsgQueue->lock);
                return FALSE;
            }
            

            pMsg->pAdd = NULL;

            if (uRemoveMsg == PM_REMOVE) {
                pMsgQueue->readpos++;
                if (pMsgQueue->readpos >= pMsgQueue->len) 
                    pMsgQueue->readpos = 0;
            }

            pthread_mutex_unlock (&pMsgQueue->lock);
            return TRUE;
        }

        pthread_mutex_unlock (&pMsgQueue->lock);
    }

    return FALSE;
}
                        
int GUIAPI PostMessage(HWND hWnd, int iMsg, WPARAM wParam, LPARAM lParam)
{
    PMSGQUEUE pMsgQueue;
    PMSG pMsg;
    int sem_value;

    if( !(pMsgQueue = GetMsgQueue(hWnd)) ) return ERR_INV_HWND;

    pthread_mutex_lock (&pMsgQueue->lock);

    if (iMsg == MSG_PAINT) {
        pMsgQueue->dwState |= QS_PAINT;
        goto goodret;
    }
    
    if ((pMsgQueue->writepos + 1) % pMsgQueue->len == pMsgQueue->readpos) {
        pthread_mutex_unlock (&pMsgQueue->lock);
        return ERR_QUEUE_FULL;
    }
    
    // Write the data and advance write pointer */
    pMsg = &(pMsgQueue->msg[pMsgQueue->writepos]);
    pMsg->hwnd = hWnd;
    pMsg->message = iMsg;
    pMsg->wParam = wParam;
    pMsg->lParam = lParam;

    pMsgQueue->writepos++;
    if (pMsgQueue->writepos >= pMsgQueue->len) pMsgQueue->writepos = 0;

    pMsgQueue->dwState |= QS_POSTMSG;

goodret:

    pthread_mutex_unlock (&pMsgQueue->lock);
    // Signal that the msg queue contains one more element for reading
    sem_getvalue (&pMsgQueue->wait, &sem_value);
    if (sem_value == 0)
        sem_post(&pMsgQueue->wait);

    return ERR_OK;
}


int GUIAPI PostQuitMessage(HWND hWnd)
{
    PMSGQUEUE pMsgQueue;
    int sem_value;

    if( !(pMsgQueue = GetMsgQueue(hWnd)) ) return ERR_INV_HWND;

    pMsgQueue->dwState |= QS_QUIT;

    // Signal that the msg queue contains one more element for reading
    sem_getvalue (&pMsgQueue->wait, &sem_value);
    if (sem_value == 0)
        sem_post(&pMsgQueue->wait);

    return ERR_OK;
}

int GUIAPI PostSyncMessage(HWND hWnd, int msg, WPARAM wParam, LPARAM lParam)
{
    PMSGQUEUE pMsgQueue;
    SYNCMSG SyncMsg;
    int sem_value;

    if( !(pMsgQueue = GetMsgQueue(hWnd)) ) return ERR_INV_HWND;

    pthread_mutex_lock (&pMsgQueue->lock);

    // queue the sync message.
    SyncMsg.Msg.hwnd = hWnd;
    SyncMsg.Msg.message = msg;
    SyncMsg.Msg.wParam = wParam;
    SyncMsg.Msg.lParam = lParam;
    SyncMsg.pNext = NULL;
    sem_init(&SyncMsg.sem_handle, 0, 0);

    if (pMsgQueue->pFirstSyncMsg == NULL) {
        pMsgQueue->pFirstSyncMsg = pMsgQueue->pLastSyncMsg = &SyncMsg;
    }
    else {
        pMsgQueue->pLastSyncMsg->pNext = &SyncMsg;
        pMsgQueue->pLastSyncMsg = &SyncMsg;
    }

    pMsgQueue->dwState |= QS_SYNCMSG;

    pthread_mutex_unlock (&pMsgQueue->lock);

    // Signal that the msg queue contains one more element for reading
    sem_getvalue (&pMsgQueue->wait, &sem_value);
    if (sem_value == 0)
        sem_post(&pMsgQueue->wait);

    // suspend until the message been handled.
    sem_wait(&SyncMsg.sem_handle);

    sem_destroy(&SyncMsg.sem_handle);

    return SyncMsg.retval;
}

int GUIAPI SendMessage(HWND hWnd, int iMsg, WPARAM wParam, LPARAM lParam)
{
    WNDPROC WndProc;
    PMAINWIN pMainWin;

    if (hWnd == HWND_INVALID) return -1;

    if (hWnd == HWND_DESKTOP) {
        if (pthread_self() != __mg_desktop)
            return PostSyncMessage (HWND_DESKTOP, iMsg, wParam, lParam);
        else
            return DesktopWinProc (hWnd, iMsg, wParam, lParam);
    }

    pMainWin = GetMainWindowPtrOfControl (hWnd);

    if (pMainWin->th != pthread_self())
        return PostSyncMessage (hWnd, iMsg, wParam, lParam);
    
    WndProc = GetWndProc(hWnd);

    return (*WndProc)(hWnd, iMsg, wParam, lParam);

}

int GUIAPI SendNotifyMessage(HWND hWnd, int iMsg, WPARAM wParam, LPARAM lParam)
{
//    PMAINWIN pMainWin;
    PMSGQUEUE pMsgQueue;
    PQMSG pqmsg;
    int sem_value;

    if (hWnd == HWND_INVALID) return -1;

    if( !(pMsgQueue = GetMsgQueue(hWnd)) ) return ERR_INV_HWND;

/*
    if (hWnd == HWND_DESKTOP) {
        if (pthread_self() == __mg_desktop)
            return DesktopWinProc (hWnd, iMsg, wParam, lParam);
    }
    else {
        pMainWin = GetMainWindowPtrOfControl (hWnd);
        if (pMainWin->th == pthread_self()) {
            WNDPROC WndProc;
    
            WndProc = GetWndProc(hWnd);

            return (*WndProc)(hWnd, iMsg, wParam, lParam);
        }
    }
*/
    
    pqmsg = QMSGAlloc();

    pthread_mutex_lock (&pMsgQueue->lock);

    // queue the sync message.
    pqmsg->Msg.hwnd = hWnd;
    pqmsg->Msg.message = iMsg;
    pqmsg->Msg.wParam = wParam;
    pqmsg->Msg.lParam = lParam;
    pqmsg->next = NULL;

    if (pMsgQueue->pFirstNotifyMsg == NULL) {
        pMsgQueue->pFirstNotifyMsg = pMsgQueue->pLastNotifyMsg = pqmsg;
    }
    else {
        pMsgQueue->pLastNotifyMsg->next = pqmsg;
        pMsgQueue->pLastNotifyMsg = pqmsg;
    }

    pMsgQueue->dwState |= QS_NOTIFYMSG;

    pthread_mutex_unlock (&pMsgQueue->lock);

    // Signal that the msg queue contains one more element for reading
    sem_getvalue (&pMsgQueue->wait, &sem_value);
    if (sem_value == 0)
        sem_post(&pMsgQueue->wait);

    return ERR_OK;
}

int GUIAPI SendAsyncMessage(HWND hWnd, int iMsg, WPARAM wParam, LPARAM lParam)
{
    WNDPROC WndProc;
    
    if (hWnd == HWND_INVALID) return -1;

    WndProc = GetWndProc(hWnd);

    return (*WndProc)(hWnd, iMsg, wParam, lParam);

}

#ifdef _TRACE_MSG

int GUIAPI DispatchMessage(PMSG pMsg)
{
    WNDPROC WndProc;
    PSYNCMSG pSyncMsg;
    int iRet;

    fprintf (stderr, "Message, %s: hWnd: %x, wP: %x, lP: %lx. %s\n",
        Message2Str (pMsg->message),
        pMsg->hwnd,
        pMsg->wParam,
        pMsg->lParam,
        pMsg->pAdd?"Sync":"Normal");

    if (pMsg->hwnd == HWND_INVALID) {
        if (pMsg->pAdd) {
            pSyncMsg = (PSYNCMSG)pMsg->pAdd;
            pSyncMsg->retval = HWND_INVALID;
            sem_post(&pSyncMsg->sem_handle);
        }
        
        fprintf (stderr, "Message have been thrown away: %s\n",
            Message2Str (pMsg->message));

        return HWND_INVALID;
    }

    WndProc = GetWndProc (pMsg->hwnd);

    if ( pMsg->pAdd ) // this is a sync message.
    {
         pSyncMsg = (PSYNCMSG)pMsg->pAdd;
         pSyncMsg->retval = (*WndProc)
                   (pMsg->hwnd, pMsg->message, pMsg->wParam, pMsg->lParam);
         sem_post(&pSyncMsg->sem_handle);
         iRet = pSyncMsg->retval;
    }

    iRet = (*WndProc)(pMsg->hwnd, pMsg->message, pMsg->wParam, pMsg->lParam);

    fprintf (stderr, "Message, %s done, return value: %x\n",
        Message2Str (pMsg->message),
        iRet);

    return iRet;
}

#else

int GUIAPI DispatchMessage(PMSG pMsg)
{
    WNDPROC WndProc;
    PSYNCMSG pSyncMsg;

    if (pMsg->hwnd == HWND_INVALID) {
        if (pMsg->pAdd) {
            pSyncMsg = (PSYNCMSG)pMsg->pAdd;
            pSyncMsg->retval = HWND_INVALID;
            sem_post(&pSyncMsg->sem_handle);
        }
        return HWND_INVALID;
    }

    WndProc = GetWndProc(pMsg->hwnd);

    if ( pMsg->pAdd ) // this is a sync message.
    {
        pSyncMsg = (PSYNCMSG)pMsg->pAdd;
        pSyncMsg->retval = (*WndProc)
                   (pMsg->hwnd, pMsg->message, pMsg->wParam, pMsg->lParam);
        sem_post(&pSyncMsg->sem_handle);
        return pSyncMsg->retval;
    }

    return (*WndProc)(pMsg->hwnd, pMsg->message, pMsg->wParam, pMsg->lParam);
}

#endif /* !TRACE_MSG */

#endif /* !LITE_VERSION */