C++ Q_Q函数代码示例

/*
    Sets the socket option \a opt to \a v.
*/
bool QNativeSocketEnginePrivate::setOption(QNativeSocketEngine::SocketOption opt, int v)
{
    Q_Q(QNativeSocketEngine);
    if (!q->isValid())
        return false;

    int n = 0;
    int level = SOL_SOCKET; // default

    switch (opt) {
    case QNativeSocketEngine::ReceiveBufferSocketOption:
        n = SO_RCVBUF;
        break;
    case QNativeSocketEngine::SendBufferSocketOption:
        n = SO_SNDBUF;
        break;
    case QNativeSocketEngine::BroadcastSocketOption:
        n = SO_BROADCAST;
        break;
    case QNativeSocketEngine::NonBlockingSocketOption: {
        // Make the socket nonblocking

        int flags = ::fcntl(socketDescriptor, F_GETFL, 0);
        if (flags == -1) {
#ifdef QNATIVESOCKETENGINE_DEBUG
            perror("QNativeSocketEnginePrivate::setOption(): fcntl(F_GETFL) failed");
#endif
            return false;
        }
        if (::fcntl(socketDescriptor, F_SETFL, flags | O_NONBLOCK) == -1) {
#ifdef QNATIVESOCKETENGINE_DEBUG
            perror("QNativeSocketEnginePrivate::setOption(): fcntl(F_SETFL) failed");
#endif
            return false;
        }

        return true;
    }
    case QNativeSocketEngine::AddressReusable:
#if defined(SO_REUSEPORT)
        // on OS X, SO_REUSEADDR isn't sufficient to allow multiple binds to the
        // same port (which is useful for multicast UDP). SO_REUSEPORT is, but
        // we most definitely do not want to use this for TCP. See QTBUG-6305.
        if (socketType == QAbstractSocket::UdpSocket)
            n = SO_REUSEPORT;
        else
            n = SO_REUSEADDR;
#else
        n = SO_REUSEADDR;
#endif
        break;
    case QNativeSocketEngine::BindExclusively:
        return true;
    case QNativeSocketEngine::ReceiveOutOfBandData:
        n = SO_OOBINLINE;
        break;
    case QNativeSocketEngine::LowDelayOption:
        level = IPPROTO_TCP;
        n = TCP_NODELAY;
        break;
    case QNativeSocketEngine::KeepAliveOption:
        n = SO_KEEPALIVE;
        break;
    case QNativeSocketEngine::MulticastTtlOption:

        if (socketProtocol == QAbstractSocket::IPv6Protocol) {
            level = IPPROTO_IPV6;
            n = IPV6_MULTICAST_HOPS;
        } else

        {
            level = IPPROTO_IP;
            n = IP_MULTICAST_TTL;
        }
        break;
    case QNativeSocketEngine::MulticastLoopbackOption:

        if (socketProtocol == QAbstractSocket::IPv6Protocol) {
            level = IPPROTO_IPV6;
            n = IPV6_MULTICAST_LOOP;
        } else

        {
            level = IPPROTO_IP;
            n = IP_MULTICAST_LOOP;
        }
        break;
    }

    return ::setsockopt(socketDescriptor, level, n, (char *) &v, sizeof(v)) == 0;
}

void QProcessPrivate::startProcess()
{
    Q_Q(QProcess);

    bool success = false;

    if (pid) {
        CloseHandle(pid->hThread);
        CloseHandle(pid->hProcess);
        delete pid;
        pid = 0;
    }
    pid = new PROCESS_INFORMATION;
    memset(pid, 0, sizeof(PROCESS_INFORMATION));

    q->setProcessState(QProcess::Starting);

    if (!createChannel(stdinChannel) ||
        !createChannel(stdoutChannel) ||
        !createChannel(stderrChannel))
        return;

    QString args = qt_create_commandline(program, arguments);
    QByteArray envlist;
    if (environment.d.constData())
        envlist = qt_create_environment(environment.d.constData()->hash);
    if (!nativeArguments.isEmpty()) {
        if (!args.isEmpty())
             args += QLatin1Char(' ');
        args += nativeArguments;
    }

#if defined QPROCESS_DEBUG
    qDebug("Creating process");
    qDebug("   program : [%s]", program.toLatin1().constData());
    qDebug("   args : %s", args.toLatin1().constData());
    qDebug("   pass environment : %s", environment.isEmpty() ? "no" : "yes");
#endif

    // Forwarded channels must not set the CREATE_NO_WINDOW flag because this
    // will render the stdout/stderr handles we're passing useless.
    DWORD dwCreationFlags = (processChannelMode == QProcess::ForwardedChannels ? 0 : CREATE_NO_WINDOW);
    dwCreationFlags |= CREATE_UNICODE_ENVIRONMENT;
    STARTUPINFOW startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
                                 0, 0, 0,
                                 STARTF_USESTDHANDLES,
                                 0, 0, 0,
                                 stdinChannel.pipe[0], stdoutChannel.pipe[1], stderrChannel.pipe[1]
    };
    success = CreateProcess(0, (wchar_t*)args.utf16(),
                            0, 0, TRUE, dwCreationFlags,
                            environment.isEmpty() ? 0 : envlist.data(),
                            workingDirectory.isEmpty() ? 0 : (wchar_t*)QDir::toNativeSeparators(workingDirectory).utf16(),
                            &startupInfo, pid);
    if (!success) {
        // Capture the error string before we do CloseHandle below
        q->setErrorString(QProcess::tr("Process failed to start: %1").arg(qt_error_string()));
    }

    if (stdinChannel.pipe[0] != INVALID_Q_PIPE) {
        CloseHandle(stdinChannel.pipe[0]);
        stdinChannel.pipe[0] = INVALID_Q_PIPE;
    }
    if (stdoutChannel.pipe[1] != INVALID_Q_PIPE) {
        CloseHandle(stdoutChannel.pipe[1]);
        stdoutChannel.pipe[1] = INVALID_Q_PIPE;
    }
    if (stderrChannel.pipe[1] != INVALID_Q_PIPE) {
        CloseHandle(stderrChannel.pipe[1]);
        stderrChannel.pipe[1] = INVALID_Q_PIPE;
    }

    if (!success) {
        cleanup();
        processError = QProcess::FailedToStart;
        emit q->error(processError);
        q->setProcessState(QProcess::NotRunning);
        return;
    }

    q->setProcessState(QProcess::Running);
    // User can call kill()/terminate() from the stateChanged() slot
    // so check before proceeding
    if (!pid)
        return;

    if (threadData->hasEventDispatcher()) {
        processFinishedNotifier = new QWinEventNotifier(pid->hProcess, q);
        QObject::connect(processFinishedNotifier, SIGNAL(activated(HANDLE)), q, SLOT(_q_processDied()));
        processFinishedNotifier->setEnabled(true);
        notifier = new QTimer(q);
        QObject::connect(notifier, SIGNAL(timeout()), q, SLOT(_q_notified()));
        notifier->start(NOTIFYTIMEOUT);
    }

    _q_startupNotification();
}

void LibInputHandlerPrivate::_q_liEventHandler()
{
    Q_Q(LibInputHandler);

    if (libinput_dispatch(li) != 0) {
        qCWarning(lcInput) << "Failed to dispatch libinput events";
        return;
    }

    libinput_event *event;
    while ((event = libinput_get_event(li)) != Q_NULLPTR) {
        libinput_event_type type = libinput_event_get_type(event);
        libinput_device *device = libinput_event_get_device(event);

        switch (type) {
        // Devices
        case LIBINPUT_EVENT_DEVICE_ADDED:
            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_KEYBOARD)) {
                ++keyboardCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->keyboardCountChanged(keyboardCount);
            }

            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_POINTER)) {
                ++pointerCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->pointerCountChanged(pointerCount);
            }

            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_TOUCH)) {
                QTouchDevice *td = touch->registerDevice(device);
                Q_EMIT q->touchDeviceRegistered(td);

                ++touchCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->touchCountChanged(touchCount);
            }

            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_GESTURE)) {
                ++gestureCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->gestureCountChanged(gestureCount);
            }
            break;
        case LIBINPUT_EVENT_DEVICE_REMOVED:
            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_KEYBOARD)) {
                --keyboardCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->keyboardCountChanged(keyboardCount);
            }

            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_POINTER)) {
                --pointerCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->pointerCountChanged(pointerCount);
            }

            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_TOUCH)) {
                QTouchDevice *td = Q_NULLPTR;
                touch->unregisterDevice(device, &td);
                Q_EMIT q->touchDeviceUnregistered(td);

                --touchCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->touchCountChanged(touchCount);
            }

            if (libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_GESTURE)) {
                --gestureCount;
                Q_EMIT q->capabilitiesChanged();
                Q_EMIT q->gestureCountChanged(gestureCount);
            }
            break;
            // Keyboard
        case LIBINPUT_EVENT_KEYBOARD_KEY:
            keyboard->handleKey(libinput_event_get_keyboard_event(event));
            break;
            // Pointer
        case LIBINPUT_EVENT_POINTER_BUTTON:
            pointer->handleButton(libinput_event_get_pointer_event(event));
            break;
        case LIBINPUT_EVENT_POINTER_AXIS:
            pointer->handleAxis(libinput_event_get_pointer_event(event));
            break;
        case LIBINPUT_EVENT_POINTER_MOTION:
            pointer->handleMotion(libinput_event_get_pointer_event(event));
            break;
        case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
            pointer->handleAbsoluteMotion(libinput_event_get_pointer_event(event));
            break;
            // Touch
        case LIBINPUT_EVENT_TOUCH_UP:
            touch->handleTouchUp(libinput_event_get_touch_event(event));
            break;
        case LIBINPUT_EVENT_TOUCH_DOWN:
            touch->handleTouchDown(libinput_event_get_touch_event(event));
            break;
        case LIBINPUT_EVENT_TOUCH_FRAME:
            touch->handleTouchFrame(libinput_event_get_touch_event(event));
            break;
//.........这里部分代码省略.........

uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size,
                                 QFile::MemoryMapFlags flags)
{
#ifndef Q_OS_WINPHONE
    Q_Q(QFSFileEngine);
    Q_UNUSED(flags);
    if (openMode == QFile::NotOpen) {
        q->setError(QFile::PermissionsError, qt_error_string(ERROR_ACCESS_DENIED));
        return 0;
    }
    if (offset == 0 && size == 0) {
        q->setError(QFile::UnspecifiedError, qt_error_string(ERROR_INVALID_PARAMETER));
        return 0;
    }

    // check/setup args to map
    DWORD access = 0;
    if (flags & QFileDevice::MapPrivateOption) {
#ifdef FILE_MAP_COPY
        access = FILE_MAP_COPY;
#else
        q->setError(QFile::UnspecifiedError, "MapPrivateOption unsupported");
        return 0;
#endif
    } else if (openMode & QIODevice::WriteOnly) {
        access = FILE_MAP_WRITE;
    } else if (openMode & QIODevice::ReadOnly) {
        access = FILE_MAP_READ;
    }

    if (mapHandle == NULL) {
        // get handle to the file
        HANDLE handle = fileHandle;

#ifndef Q_OS_WINCE
        if (handle == INVALID_HANDLE_VALUE && fh)
            handle = (HANDLE)::_get_osfhandle(QT_FILENO(fh));
#endif

#ifdef Q_USE_DEPRECATED_MAP_API
        nativeClose();
        // handle automatically closed by kernel with mapHandle (below).
        handle = ::CreateFileForMapping((const wchar_t*)fileEntry.nativeFilePath().utf16(),
                GENERIC_READ | (openMode & QIODevice::WriteOnly ? GENERIC_WRITE : 0),
                0,
                NULL,
                OPEN_EXISTING,
                FILE_ATTRIBUTE_NORMAL,
                NULL);
        // Since this is a special case, we check if the return value was NULL and if so
        // we change it to INVALID_HANDLE_VALUE to follow the logic inside this function.
        if(0 == handle)
            handle = INVALID_HANDLE_VALUE;
#endif

        if (handle == INVALID_HANDLE_VALUE) {
            q->setError(QFile::PermissionsError, qt_error_string(ERROR_ACCESS_DENIED));
            return 0;
        }

        // first create the file mapping handle
        DWORD protection = (openMode & QIODevice::WriteOnly) ? PAGE_READWRITE : PAGE_READONLY;
#ifndef Q_OS_WINRT
        mapHandle = ::CreateFileMapping(handle, 0, protection, 0, 0, 0);
#else
        mapHandle = ::CreateFileMappingFromApp(handle, 0, protection, 0, 0);
#endif
        if (mapHandle == NULL) {
            q->setError(QFile::PermissionsError, qt_error_string());
#ifdef Q_USE_DEPRECATED_MAP_API
            ::CloseHandle(handle);
#endif
            return 0;
        }
    }

    DWORD offsetHi = offset >> 32;
    DWORD offsetLo = offset & Q_UINT64_C(0xffffffff);
    SYSTEM_INFO sysinfo;
#ifndef Q_OS_WINRT
    ::GetSystemInfo(&sysinfo);
#else
    ::GetNativeSystemInfo(&sysinfo);
#endif
    DWORD mask = sysinfo.dwAllocationGranularity - 1;
    DWORD extra = offset & mask;
    if (extra)
        offsetLo &= ~mask;

    // attempt to create the map
#ifndef Q_OS_WINRT
    LPVOID mapAddress = ::MapViewOfFile(mapHandle, access,
                                      offsetHi, offsetLo, size + extra);
#else
    LPVOID mapAddress = ::MapViewOfFileFromApp(mapHandle, access,
                                               (ULONG64(offsetHi) << 32) + offsetLo, size + extra);
#endif
    if (mapAddress) {
        uchar *address = extra + static_cast<uchar*>(mapAddress);
        maps[address] = extra;
//.........这里部分代码省略.........

void QLocalSocketPrivate::_q_canWrite()
{
    Q_Q(QLocalSocket);
    if (state == QLocalSocket::ClosingState)
        q->close();
}

void QAbstractTransitionPrivate::emitTriggered()
{
    Q_Q(QAbstractTransition);
    emit q->triggered();
}

//------------------------------------------------------------------------------
void ctkDICOMDatabasePrivate::init(QString databaseFilename)
{
  Q_Q(ctkDICOMDatabase);

  q->openDatabase(databaseFilename);
}

void QToolButtonPrivate::popupTimerDone()
{
    Q_Q(QToolButton);
    popupTimer.stop();
    if (!menuButtonDown && !down)
        return;

    menuButtonDown = true;
    QPointer<QMenu> actualMenu;
    bool mustDeleteActualMenu = false;
    if(menuAction) {
        actualMenu = menuAction->menu();
    } else if (defaultAction && defaultAction->menu()) {
        actualMenu = defaultAction->menu();
    } else {
        actualMenu = new QMenu(q);
        mustDeleteActualMenu = true;
        for(int i = 0; i < actions.size(); i++)
            actualMenu->addAction(actions.at(i));
    }
    repeat = q->autoRepeat();
    q->setAutoRepeat(false);
    bool horizontal = true;
#if !defined(QT_NO_TOOLBAR)
    QToolBar *tb = qobject_cast<QToolBar*>(parent);
    if (tb && tb->orientation() == Qt::Vertical)
        horizontal = false;
#endif
    QPoint p;
    QRect screen = QApplication::desktop()->availableGeometry(q);
    QSize sh = ((QToolButton*)(QMenu*)actualMenu)->receivers(SIGNAL(aboutToShow()))? QSize() : actualMenu->sizeHint();
    QRect rect = q->rect();
    if (horizontal) {
        if (q->isRightToLeft()) {
            if (q->mapToGlobal(QPoint(0, rect.bottom())).y() + sh.height() <= screen.height()) {
                p = q->mapToGlobal(rect.bottomRight());
            } else {
                p = q->mapToGlobal(rect.topRight() - QPoint(0, sh.height()));
            }
            p.rx() -= sh.width();
        } else {
            if (q->mapToGlobal(QPoint(0, rect.bottom())).y() + sh.height() <= screen.height()) {
                p = q->mapToGlobal(rect.bottomLeft());
            } else {
                p = q->mapToGlobal(rect.topLeft() - QPoint(0, sh.height()));
            }
        }
    } else {
        if (q->isRightToLeft()) {
            if (q->mapToGlobal(QPoint(rect.left(), 0)).x() - sh.width() <= screen.x()) {
                p = q->mapToGlobal(rect.topRight());
            } else {
                p = q->mapToGlobal(rect.topLeft());
                p.rx() -= sh.width();
            }
        } else {
            if (q->mapToGlobal(QPoint(rect.right(), 0)).x() + sh.width() <= screen.right()) {
                p = q->mapToGlobal(rect.topRight());
            } else {
                p = q->mapToGlobal(rect.topLeft() - QPoint(sh.width(), 0));
            }
        }
    }
    p.rx() = qMax(screen.left(), qMin(p.x(), screen.right() - sh.width()));
    p.ry() += 1;
    QPointer<QToolButton> that = q;
    actualMenu->setNoReplayFor(q);
    if (!mustDeleteActualMenu) //only if action are not in this widget
        QObject::connect(actualMenu, SIGNAL(triggered(QAction*)), q, SLOT(_q_menuTriggered(QAction*)));
    QObject::connect(actualMenu, SIGNAL(aboutToHide()), q, SLOT(_q_updateButtonDown()));
    actualMenu->d_func()->causedPopup.widget = q;
    actualMenu->d_func()->causedPopup.action = defaultAction;
    actionsCopy = q->actions(); //(the list of action may be modified in slots)
    actualMenu->exec(p);
    QObject::disconnect(actualMenu, SIGNAL(aboutToHide()), q, SLOT(_q_updateButtonDown()));
    if (mustDeleteActualMenu)
        delete actualMenu;
    else
        QObject::disconnect(actualMenu, SIGNAL(triggered(QAction*)), q, SLOT(_q_menuTriggered(QAction*)));

    if (!that)
        return;

    actionsCopy.clear();

    if (repeat)
        q->setAutoRepeat(true);
}

//.........这里部分代码省略.........

    The length of the slider is usually related to the value of the page step,
    and typically represents the proportion of the document area shown in a
    scrolling view. The page step is the amount that the value changes by
    when the user presses the \uicontrol{Page Up} and \uicontrol{Page Down} keys, and is
    set with setPageStep(). Smaller changes to the value defined by the
    line step are made using the cursor keys, and this quantity is set with
    \l{QAbstractSlider::}{setSingleStep()}.

    Note that the range of values used is independent of the actual size
    of the scroll bar widget. You do not need to take this into account when
    you choose values for the range and the page step.

    The range of values specified for the scroll bar are often determined
    differently to those for a QSlider because the length of the slider
    needs to be taken into account. If we have a document with 100 lines,
    and we can only show 20 lines in a widget, we may wish to construct a
    scroll bar with a page step of 20, a minimum value of 0, and a maximum
    value of 80. This would give us a scroll bar with five "pages".

    \table
    \row \li \inlineimage qscrollbar-values.png
    \li The relationship between a document length, the range of values used
    in a scroll bar, and the page step is simple in many common situations.
    The scroll bar's range of values is determined by subtracting a
    chosen page step from some value representing the length of the document.
    In such cases, the following equation is useful:
    \e{document length} = maximum() - minimum() + pageStep().
    \endtable

    QScrollBar only provides integer ranges. Note that although
    QScrollBar handles very large numbers, scroll bars on current
    screens cannot usefully represent ranges above about 100,000 pixels.
    Beyond that, it becomes difficult for the user to control the
    slider using either the keyboard or the mouse, and the scroll
    arrows will have limited use.

    ScrollBar inherits a comprehensive set of signals from QAbstractSlider:
    \list
    \li \l{QAbstractSlider::valueChanged()}{valueChanged()} is emitted when the
       scroll bar's value has changed. The tracking() determines whether this
       signal is emitted during user interaction.
    \li \l{QAbstractSlider::rangeChanged()}{rangeChanged()} is emitted when the
       scroll bar's range of values has changed.
    \li \l{QAbstractSlider::sliderPressed()}{sliderPressed()} is emitted when
       the user starts to drag the slider.
    \li \l{QAbstractSlider::sliderMoved()}{sliderMoved()} is emitted when the user
       drags the slider.
    \li \l{QAbstractSlider::sliderReleased()}{sliderReleased()} is emitted when
       the user releases the slider.
    \li \l{QAbstractSlider::actionTriggered()}{actionTriggered()} is emitted
       when the scroll bar is changed by user interaction or via the
       \l{QAbstractSlider::triggerAction()}{triggerAction()} function.
    \endlist

    A scroll bar can be controlled by the keyboard, but it has a
    default focusPolicy() of Qt::NoFocus. Use setFocusPolicy() to
    enable keyboard interaction with the scroll bar:
    \list
         \li Left/Right move a horizontal scroll bar by one single step.
         \li Up/Down move a vertical scroll bar by one single step.
         \li PageUp moves up one page.
         \li PageDown moves down one page.
         \li Home moves to the start (mininum).
         \li End moves to the end (maximum).
     \endlist

    The slider itself can be controlled by using the
    \l{QAbstractSlider::triggerAction()}{triggerAction()} function to simulate
    user interaction with the scroll bar controls. This is useful if you have
    many different widgets that use a common range of values.

    Most GUI styles use the pageStep() value to calculate the size of the
    slider.

    \table 100%
    \row \li \inlineimage macintosh-horizontalscrollbar.png Screenshot of a Macintosh style scroll bar
         \li A scroll bar shown in the \l{Macintosh Style Widget Gallery}{Macintosh widget style}.
    \row \li \inlineimage windowsvista-horizontalscrollbar.png Screenshot of a Windows Vista style scroll bar
         \li A scroll bar shown in the \l{Windows Vista Style Widget Gallery}{Windows Vista widget style}.
    \row \li \inlineimage fusion-horizontalscrollbar.png Screenshot of a Fusion style scroll bar
         \li A scroll bar shown in the \l{Fusion Style Widget Gallery}{Fusion widget style}.
    \endtable

    \sa QScrollArea, QSlider, QDial, QSpinBox, {fowler}{GUI Design Handbook: Scroll Bar}, {Sliders Example}
*/

bool QScrollBarPrivate::updateHoverControl(const QPoint &pos)
{
    Q_Q(QScrollBar);
    QRect lastHoverRect = hoverRect;
    QStyle::SubControl lastHoverControl = hoverControl;
    bool doesHover = q->testAttribute(Qt::WA_Hover);
    if (lastHoverControl != newHoverControl(pos) && doesHover) {
        q->update(lastHoverRect);
        q->update(hoverRect);
        return true;
    }
    return !doesHover;
}

// -----------------------------------------------------------------------------
void ctkDynamicSpacerPrivate::init()
{
  Q_Q(ctkDynamicSpacer);
  this->ActiveSizePolicy = q->sizePolicy();
  this->InactiveSizePolicy = q->sizePolicy();
}

void QAbstractAnimationPrivate::setState(QAbstractAnimation::State newState)
{
    Q_Q(QAbstractAnimation);
    if (state == newState)
        return;

    if (loopCount == 0)
        return;

    QAbstractAnimation::State oldState = state;
    int oldCurrentTime = currentTime;
    int oldCurrentLoop = currentLoop;
    QAbstractAnimation::Direction oldDirection = direction;

    // check if we should Rewind
    if ((newState == QAbstractAnimation::Paused || newState == QAbstractAnimation::Running)
        && oldState == QAbstractAnimation::Stopped) {
            //here we reset the time if needed
            //we don't call setCurrentTime because this might change the way the animation
            //behaves: changing the state or changing the current value
            totalCurrentTime = currentTime = (direction == QAbstractAnimation::Forward) ?
                0 : (loopCount == -1 ? q->duration() : q->totalDuration());
    }

    state = newState;
    QWeakPointer<QAbstractAnimation> guard(q);

    //(un)registration of the animation must always happen before calls to
    //virtual function (updateState) to ensure a correct state of the timer
    bool isTopLevel = !group || group->state() == QAbstractAnimation::Stopped;
    if (oldState == QAbstractAnimation::Running) {
        if (newState == QAbstractAnimation::Paused && hasRegisteredTimer)
            QUnifiedTimer::ensureTimerUpdate();
        //the animation, is not running any more
        QUnifiedTimer::unregisterAnimation(q);
    } else if (newState == QAbstractAnimation::Running) {
        QUnifiedTimer::registerAnimation(q, isTopLevel);
    }

    q->updateState(newState, oldState);
    if (!guard || newState != state) //this is to be safe if updateState changes the state
        return;

    // Notify state change
    emit q->stateChanged(newState, oldState);
    if (!guard || newState != state) //this is to be safe if updateState changes the state
        return;

    switch (state) {
    case QAbstractAnimation::Paused:
        break;
    case QAbstractAnimation::Running:
        {

            // this ensures that the value is updated now that the animation is running
            if (oldState == QAbstractAnimation::Stopped) {
                if (isTopLevel) {
                    // currentTime needs to be updated if pauseTimer is active
                    QUnifiedTimer::ensureTimerUpdate();
                    q->setCurrentTime(totalCurrentTime);
                }
            }
        }
        break;
    case QAbstractAnimation::Stopped:
        // Leave running state.
        int dura = q->duration();

        if (deleteWhenStopped)
            q->deleteLater();

        if (dura == -1 || loopCount < 0
            || (oldDirection == QAbstractAnimation::Forward && (oldCurrentTime * (oldCurrentLoop + 1)) == (dura * loopCount))
            || (oldDirection == QAbstractAnimation::Backward && oldCurrentTime == 0)) {
                emit q->finished();
        }
        break;
    }
}

void QItemDelegatePrivate::_q_commitDataAndCloseEditor(QWidget *editor)
{
    Q_Q(QItemDelegate);
    emit q->commitData(editor);
    emit q->closeEditor(editor, QAbstractItemDelegate::SubmitModelCache);
}

bool QSerialPortPrivate::open(QIODevice::OpenMode mode)
{
    Q_Q(QSerialPort);

    DWORD desiredAccess = 0;
    originalEventMask = EV_ERR | EV_CTS | EV_DSR | EV_RING /*| EV_RLSD*/;

    if (mode & QIODevice::ReadOnly) {
        desiredAccess |= GENERIC_READ;
        originalEventMask |= EV_RXCHAR;
    }
    if (mode & QIODevice::WriteOnly)
        desiredAccess |= GENERIC_WRITE;

    handle = ::CreateFile(reinterpret_cast<const wchar_t*>(systemLocation.utf16()),
                              desiredAccess, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);

    if (handle == INVALID_HANDLE_VALUE) {
        q->setError(decodeSystemError());
        return false;
    }

    ::ZeroMemory(&restoredDcb, sizeof(restoredDcb));
    restoredDcb.DCBlength = sizeof(restoredDcb);

    if (!::GetCommState(handle, &restoredDcb)) {
        q->setError(decodeSystemError());
        return false;
    }

    currentDcb = restoredDcb;
    currentDcb.fBinary = TRUE;
    currentDcb.fInX = FALSE;
    currentDcb.fOutX = FALSE;
    currentDcb.fAbortOnError = FALSE;
    currentDcb.fNull = FALSE;
    currentDcb.fErrorChar = FALSE;

    if (currentDcb.fDtrControl ==  DTR_CONTROL_HANDSHAKE)
        currentDcb.fDtrControl = DTR_CONTROL_DISABLE;

    if (!updateDcb())
        return false;

    if (!::GetCommTimeouts(handle, &restoredCommTimeouts)) {
        q->setError(decodeSystemError());
        return false;
    }

    ::ZeroMemory(&currentCommTimeouts, sizeof(currentCommTimeouts));
    currentCommTimeouts.ReadIntervalTimeout = MAXDWORD;

    if (!updateCommTimeouts())
        return false;

    if (mode & QIODevice::ReadOnly)
        readCompletionNotifier->setEnabled(true);

    if (mode & QIODevice::WriteOnly)
        writeCompletionNotifier->setEnabled(true);

    if (!::SetCommMask(handle, originalEventMask)) {
        q->setError(decodeSystemError());
        return false;
    }

    if (!startAsyncCommunication())
        return false;

    communicationNotifier->setEnabled(true);

    return true;
}

/*
    Initializes the data structure needed by qGeomCalc and
    recalculates max/min and size hint.
*/
void QBoxLayoutPrivate::setupGeom()
{
    if (!dirty)
        return;

    Q_Q(QBoxLayout);
    int maxw = horz(dir) ? 0 : QLAYOUTSIZE_MAX;
    int maxh = horz(dir) ? QLAYOUTSIZE_MAX : 0;
    int minw = 0;
    int minh = 0;
    int hintw = 0;
    int hinth = 0;

    bool horexp = false;
    bool verexp = false;

    hasHfw = false;

    int n = list.count();
    geomArray.clear();
    QVector<QLayoutStruct> a(n);

    QSizePolicy::ControlTypes controlTypes1;
    QSizePolicy::ControlTypes controlTypes2;
    int fixedSpacing = q->spacing();
    int previousNonEmptyIndex = -1;

    QStyle *style = 0;
    if (fixedSpacing < 0) {
        if (QWidget *parentWidget = q->parentWidget())
            style = parentWidget->style();
    }

    for (int i = 0; i < n; i++) {
        QBoxLayoutItem *box = list.at(i);
        QSize max = box->item->maximumSize();
        QSize min = box->item->minimumSize();
        QSize hint = box->item->sizeHint();
        Qt::Orientations exp = box->item->expandingDirections();
        bool empty = box->item->isEmpty();
        int spacing = 0;

        if (!empty) {
            if (fixedSpacing >= 0) {
                spacing = (previousNonEmptyIndex >= 0) ? fixedSpacing : 0;
#ifdef Q_OS_MAC
                if (!horz(dir) && previousNonEmptyIndex >= 0) {
                    QBoxLayoutItem *sibling = (dir == QBoxLayout::TopToBottom  ? box : list.at(previousNonEmptyIndex));
                    if (sibling) {
                        QWidget *wid = sibling->item->widget();
                        if (wid)
                            spacing = qMax(spacing, sibling->item->geometry().top() - wid->geometry().top());
                    }
                }
#endif
            } else {
                controlTypes1 = controlTypes2;
                controlTypes2 = box->item->controlTypes();
                if (previousNonEmptyIndex >= 0) {
                    QSizePolicy::ControlTypes actual1 = controlTypes1;
                    QSizePolicy::ControlTypes actual2 = controlTypes2;
                    if (dir == QBoxLayout::RightToLeft || dir == QBoxLayout::BottomToTop)
                        qSwap(actual1, actual2);

                    if (style) {
                        spacing = style->combinedLayoutSpacing(actual1, actual2,
                                             horz(dir) ? Qt::Horizontal : Qt::Vertical,
                                             0, q->parentWidget());
                        if (spacing < 0)
                            spacing = 0;
                    }
                }
            }

            if (previousNonEmptyIndex >= 0)
                a[previousNonEmptyIndex].spacing = spacing;
            previousNonEmptyIndex = i;
        }

        bool ignore = empty && box->item->widget(); // ignore hidden widgets
        bool dummy = true;
        if (horz(dir)) {
            bool expand = (exp & Qt::Horizontal || box->stretch > 0);
            horexp = horexp || expand;
            maxw += spacing + max.width();
            minw += spacing + min.width();
            hintw += spacing + hint.width();
            if (!ignore)
                qMaxExpCalc(maxh, verexp, dummy,
                            max.height(), exp & Qt::Vertical, box->item->isEmpty());
            minh = qMax(minh, min.height());
            hinth = qMax(hinth, hint.height());

            a[i].sizeHint = hint.width();
            a[i].maximumSize = max.width();
            a[i].minimumSize = min.width();
//.........这里部分代码省略.........

void QLCDNumberPrivate::drawSegment(const QPoint &pos, char segmentNo, QPainter &p,
                                    int segLen, bool erase)
{
    Q_Q(QLCDNumber);
    QPoint ppt;
    QPoint pt = pos;
    int width = segLen/5;

    const QPalette &pal = q->palette();
    QColor lightColor,darkColor,fgColor;
    if (erase){
        lightColor = pal.color(q->backgroundRole());
        darkColor  = lightColor;
        fgColor    = lightColor;
    } else {
        lightColor = pal.light().color();
        darkColor  = pal.dark().color();
        fgColor    = pal.color(q->foregroundRole());
    }


#define LINETO(X,Y) addPoint(a, QPoint(pt.x() + (X),pt.y() + (Y)))
#define LIGHT
#define DARK

    if (fill) {
        QPolygon a(0);
        //The following is an exact copy of the switch below.
        //don't make any changes here
        switch (segmentNo) {
        case 0 :
            ppt = pt;
            LIGHT;
            LINETO(segLen - 1,0);
            DARK;
            LINETO(segLen - width - 1,width);
            LINETO(width,width);
            LINETO(0,0);
            break;
        case 1 :
            pt += QPoint(0 , 1);
            ppt = pt;
            LIGHT;
            LINETO(width,width);
            DARK;
            LINETO(width,segLen - width/2 - 2);
            LINETO(0,segLen - 2);
            LIGHT;
            LINETO(0,0);
            break;
        case 2 :
            pt += QPoint(segLen - 1 , 1);
            ppt = pt;
            DARK;
            LINETO(0,segLen - 2);
            LINETO(-width,segLen - width/2 - 2);
            LIGHT;
            LINETO(-width,width);
            LINETO(0,0);
            break;
        case 3 :
            pt += QPoint(0 , segLen);
            ppt = pt;
            LIGHT;
            LINETO(width,-width/2);
            LINETO(segLen - width - 1,-width/2);
            LINETO(segLen - 1,0);
            DARK;
            if (width & 1) {            // adjust for integer division error
                LINETO(segLen - width - 3,width/2 + 1);
                LINETO(width + 2,width/2 + 1);
            } else {
                LINETO(segLen - width - 1,width/2);
                LINETO(width,width/2);
            }
            LINETO(0,0);
            break;
        case 4 :
            pt += QPoint(0 , segLen + 1);
            ppt = pt;
            LIGHT;
            LINETO(width,width/2);
            DARK;
            LINETO(width,segLen - width - 2);
            LINETO(0,segLen - 2);
            LIGHT;
            LINETO(0,0);
            break;
        case 5 :
            pt += QPoint(segLen - 1 , segLen + 1);
            ppt = pt;
            DARK;
            LINETO(0,segLen - 2);
            LINETO(-width,segLen - width - 2);
            LIGHT;
            LINETO(-width,width/2);
            LINETO(0,0);
            break;
        case 6 :
            pt += QPoint(0 , segLen*2);
//.........这里部分代码省略.........