qicon.cpp

奇趣公司比较新的qt/emd版本

    QPixmap pm;
    QString fileName;
    QSize sz;
    uint mode;
    uint state;

    in >> num_entries;
    for (int i=0; i < num_entries; ++i) {
        if (in.atEnd()) {
            pixmaps.clear();
            return false;
        }
        in >> pm;
        in >> fileName;
        in >> sz;
        in >> mode;
        in >> state;
        if (pm.isNull())
            addFile(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
        else
            addPixmap(pm, QIcon::Mode(mode), QIcon::State(state));
    }
    return true;
}

bool QPixmapIconEngine::write(QDataStream &out) const
{
    int num_entries = pixmaps.size();
    out << num_entries;
    for (int i=0; i < num_entries; ++i) {
        if (pixmaps.at(i).pixmap.isNull())
            out << QPixmap(pixmaps.at(i).fileName);
        else
            out << pixmaps.at(i).pixmap;
        out << pixmaps.at(i).fileName;
        out << pixmaps.at(i).size;
        out << (uint) pixmaps.at(i).mode;
        out << (uint) pixmaps.at(i).state;
    }
    return true;
}

#ifndef QT_NO_LIBRARY
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
    (QIconEngineFactoryInterface_iid, QCoreApplication::libraryPaths(), QLatin1String("/iconengines"), Qt::CaseInsensitive))
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loaderV2,
    (QIconEngineFactoryInterfaceV2_iid, QCoreApplication::libraryPaths(), QLatin1String("/iconengines"), Qt::CaseInsensitive))
#endif



/*!
  \class QIcon

  \brief The QIcon class provides scalable icons in different modes
  and states.

  \ingroup multimedia
  \ingroup shared
  \mainclass

  A QIcon can generate smaller, larger, active, and disabled pixmaps
  from the set of pixmaps it is given. Such pixmaps are used by Qt
  widgets to show an icon representing a particular action.

  The simplest use of QIcon is to create one from a QPixmap file or
  resource, and then use it, allowing Qt to work out all the required
  icon styles and sizes. For example:

  \code
    QToolButton *button = new QToolButton;
    button->setIcon(QIcon("open.xpm"));
  \endcode

  To undo a QIcon, simply set a null icon in its place:
  
  \code
   button->setIcon(QIcon());
  \endcode
  
  Use the QImageReader::supportedImageFormats() and
  QImageWriter::supportedImageFormats() functions to retrieve a
  complete list of the supported file formats.

  When you retrieve a pixmap using pixmap(QSize, Mode, State), and no
  pixmap for this given size, mode and state has been added with
  addFile() or addPixmap(), then QIcon will generate one on the
  fly. This pixmap generation happens in a QIconEngineV2. The default
  engine scales pixmaps down if required, but never up, and it uses
  the current style to calculate a disabled appearance. By using
  custom icon engines, you can customize every aspect of generated
  icons. With QIconEnginePluginV2 it is possible to register different
  icon engines for different file suffixes, so you could provide a SVG
  icon engine or any other scalable format.

  \section1 Making Classes that Use QIcon

  If you write your own widgets that have an option to set a small
  pixmap, consider allowing a QIcon to be set for that pixmap.  The
  Qt class QToolButton is an example of such a widget.

  Provide a method to set a QIcon, and when you draw the icon, choose
  whichever pixmap is appropriate for the current state of your widget.
  For example:
  \code
    void MyWidget::drawIcon(QPainter *painter, QPoint pos)
    {
        QPixmap pixmap = icon.pixmap(QSize(22, 22),
                                       isEnabled() ? QIcon::Normal
                                                   : QIcon::Disabled,
                                       isOn() ? QIcon::On
                                              : QIcon::Off);
        painter->drawPixmap(pos, pixmap);
    }
  \endcode

  You might also make use of the \c Active mode, perhaps making your
  widget \c Active when the mouse is over the widget (see \l
  QWidget::enterEvent()), while the mouse is pressed pending the
  release that will activate the function, or when it is the currently
  selected item. If the widget can be toggled, the "On" mode might be
  used to draw a different icon.

  \img icon.png QIcon

  \sa {fowler}{GUI Design Handbook: Iconic Label}, {Icons Example}
*/


/*!
  Constructs a null icon.
*/
QIcon::QIcon()
    : d(0)
{
}

/*!
  Constructs an icon from a \a pixmap.
 */
QIcon::QIcon(const QPixmap &pixmap)
    :d(0)
{
    addPixmap(pixmap);
}

/*!
  Constructs a copy of \a other. This is very fast.
*/
QIcon::QIcon(const QIcon &other)
    :d(other.d)
{
    if (d)
        d->ref.ref();
}

/*!
    Constructs an icon from the file with the given \a fileName. The
    file will be loaded on demand.

    If \a fileName contains a relative path (e.g. the filename only)
    the relevant file must be found relative to the runtime working
    directory.

    The file name can be either refer to an actual file on disk or to
    one of the application's embedded resources.  See the
    \l{resources.html}{Resource System} overview for details on how to
    embed images and other resource files in the application's
    executable.

    Use the QImageReader::supportedImageFormats() and
    QImageWriter::supportedImageFormats() functions to retrieve a
    complete list of the supported file formats.
*/
QIcon::QIcon(const QString &fileName)
    : d(0)
{
    QFileInfo info(fileName);
    QString suffix = info.suffix();
#ifndef QT_NO_LIBRARY
    if (!suffix.isEmpty()) {
        // first try version 2 engines..
        if (QIconEngineFactoryInterfaceV2 *factory = qobject_cast<QIconEngineFactoryInterfaceV2*>(loaderV2()->instance(suffix))) {
            if (QIconEngine *engine = factory->create(fileName)) {
                d = new QIconPrivate;
                d->engine = engine;
                return;
            }
        }
        // ..then fall back and try to load version 1 engines
        if (QIconEngineFactoryInterface *factory = qobject_cast<QIconEngineFactoryInterface*>(loader()->instance(suffix))) {
            if (QIconEngine *engine = factory->create(fileName)) {
                d = new QIconPrivate;
                d->engine = engine;
                d->engine_version = 1;
                return;
            }
        }
    }
#endif
    addFile(fileName);
}


/*!
    Creates an icon with a specific icon \a engine. The icon takes
    ownership of the engine.
*/
QIcon::QIcon(QIconEngine *engine)
    :d(new QIconPrivate)
{
    d->engine_version = 1;
    d->engine = engine;
}

/*!
    Creates an icon with a specific icon \a engine. The icon takes
    ownership of the engine.
*/
QIcon::QIcon(QIconEngineV2 *engine)
    :d(new QIconPrivate)
{
    d->engine_version = 2;
    d->engine = engine;
}


/*!
    Destroys the icon.
*/
QIcon::~QIcon()
{
    if (d && !d->ref.deref())
        delete d;
}

/*!
    Assigns the \a other icon to this icon and returns a reference to
    this icon.
*/
QIcon &QIcon::operator=(const QIcon &other)
{
    QIconPrivate *x = other.d;
    if (x)
        x->ref.ref();
    x = qAtomicSetPtr(&d, x);
    if (x && !x->ref.deref())
        delete x;
    return *this;
}

/*!
   Returns the icon as a QVariant.
*/
QIcon::operator QVariant() const
{
    return QVariant(QVariant::Icon, this);
}

/*! \obsolete

    Returns a number that identifies the contents of this
    QIcon object. Distinct QIcon objects can have
    the same serial number if they refer to the same contents
    (but they don't have to). Also, the serial number of
    a QIcon object may change during its lifetime.

    Use cacheKey() instead.

    A null icon always has a serial number of 0.

    Serial numbers are mostly useful in conjunction with caching.

    \sa QPixmap::serialNumber()
*/

int QIcon::serialNumber() const
{
    return d ? d->serialNum : 0;
}

/*!
    Returns a number that identifies the contents of this QIcon
    object. Distinct QIcon objects can have the same key if
    they refer to the same contents.
    \since 4.3

    The cacheKey() will change when the icon is altered via
    addPixmap() or addFile().

    Cache keys are mostly useful in conjunction with caching.

    \sa QPixmap::cacheKey()
*/
qint64 QIcon::cacheKey() const
{
    if (!d)
        return 0;
    return (((qint64) d->serialNum) << 32) | ((qint64) (d->detach_no));
}

/*!
  Returns a pixmap with the requested \a size, \a mode, and \a
  state, generating one if necessary. The pixmap might be smaller than
  requested, but never larger.

  \sa actualSize(), paint()
*/
QPixmap QIcon::pixmap(const QSize &size, Mode mode, State state) const
{
    if (!d)
        return QPixmap();
    return d->engine->pixmap(size, mode, state);
}

/*!
    \fn QPixmap QIcon::pixmap(int w, int h, Mode mode = Normal, State state = Off) const

    \overload

    Returns a pixmap of size QSize(\a w, \a h). The pixmap might be smaller than
    requested, but never larger.
*/

/*!
    \fn QPixmap QIcon::pixmap(int extent, Mode mode = Normal, State state = Off) const

    \overload

    Returns a pixmap of size QSize(\a extent, \a extent). The pixmap might be smaller
    than requested, but never larger.
*/

/*!  Returns the actual size of the icon for the requested \a size, \a
  mode, and \a state. The result might be smaller than requested, but
  never larger.

  \sa pixmap(), paint()
*/
QSize QIcon::actualSize(const QSize &size, Mode mode, State state) const
{
    if (!d)