/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the either Technology Preview License Agreement or the ** Beta Release License Agreement. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at http://qt.nokia.com/contact. ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qicon.h" #include "qicon_p.h" #include "qiconengine.h" #include "qiconengineplugin.h" #include "private/qfactoryloader_p.h" #include "private/qiconloader_p.h" #include "qapplication.h" #include "qstyleoption.h" #include "qpainter.h" #include "qfileinfo.h" #include "qstyle.h" #include "qpixmapcache.h" #include "qvariant.h" #include "qcache.h" #include "qdebug.h" #ifdef Q_WS_MAC #include #include #endif #ifdef Q_WS_X11 #include "private/qt_x11_p.h" #include "private/qkde_p.h" #endif QT_BEGIN_NAMESPACE /*! \enum QIcon::Mode This enum type describes the mode for which a pixmap is intended to be used. The currently defined modes are: \value Normal Display the pixmap when the user is not interacting with the icon, but the functionality represented by the icon is available. \value Disabled Display the pixmap when the functionality represented by the icon is not available. \value Active Display the pixmap when the functionality represented by the icon is available and the user is interacting with the icon, for example, moving the mouse over it or clicking it. \value Selected Display the pixmap when the item represented by the icon is selected. */ /*! \enum QIcon::State This enum describes the state for which a pixmap is intended to be used. The \e state can be: \value Off Display the pixmap when the widget is in an "off" state \value On Display the pixmap when the widget is in an "on" state */ static QBasicAtomicInt serialNumCounter = Q_BASIC_ATOMIC_INITIALIZER(1); QIconPrivate::QIconPrivate() : engine(0), ref(1), serialNum(serialNumCounter.fetchAndAddRelaxed(1)), detach_no(0), engine_version(2), v1RefCount(0) { } QPixmapIconEngine::QPixmapIconEngine() { } QPixmapIconEngine::QPixmapIconEngine(const QPixmapIconEngine &other) : QIconEngineV2(other), pixmaps(other.pixmaps) { } QPixmapIconEngine::~QPixmapIconEngine() { } void QPixmapIconEngine::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state) { QSize pixmapSize = rect.size(); #if defined(Q_WS_MAC) pixmapSize *= qt_mac_get_scalefactor(); #endif painter->drawPixmap(rect, pixmap(pixmapSize, mode, state)); } static inline int area(const QSize &s) { return s.width() * s.height(); } // returns the smallest of the two that is still larger than or equal to size. static QPixmapIconEngineEntry *bestSizeMatch( const QSize &size, QPixmapIconEngineEntry *pa, QPixmapIconEngineEntry *pb) { int s = area(size); if (pa->size == QSize() && pa->pixmap.isNull()) { pa->pixmap = QPixmap(pa->fileName); pa->size = pa->pixmap.size(); } int a = area(pa->size); if (pb->size == QSize() && pb->pixmap.isNull()) { pb->pixmap = QPixmap(pb->fileName); pb->size = pb->pixmap.size(); } int b = area(pb->size); int res = a; if (qMin(a,b) >= s) res = qMin(a,b); else res = qMax(a,b); if (res == a) return pa; return pb; } QPixmapIconEngineEntry *QPixmapIconEngine::tryMatch(const QSize &size, QIcon::Mode mode, QIcon::State state) { QPixmapIconEngineEntry *pe = 0; for (int i = 0; i < pixmaps.count(); ++i) if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) { if (pe) pe = bestSizeMatch(size, &pixmaps[i], pe); else pe = &pixmaps[i]; } return pe; } QPixmapIconEngineEntry *QPixmapIconEngine::bestMatch(const QSize &size, QIcon::Mode mode, QIcon::State state, bool sizeOnly) { QPixmapIconEngineEntry *pe = tryMatch(size, mode, state); while (!pe){ QIcon::State oppositeState = (state == QIcon::On) ? QIcon::Off : QIcon::On; if (mode == QIcon::Disabled || mode == QIcon::Selected) { QIcon::Mode oppositeMode = (mode == QIcon::Disabled) ? QIcon::Selected : QIcon::Disabled; if ((pe = tryMatch(size, QIcon::Normal, state))) break; if ((pe = tryMatch(size, QIcon::Active, state))) break; if ((pe = tryMatch(size, mode, oppositeState))) break; if ((pe = tryMatch(size, QIcon::Normal, oppositeState))) break; if ((pe = tryMatch(size, QIcon::Active, oppositeState))) break; if ((pe = tryMatch(size, oppositeMode, state))) break; if ((pe = tryMatch(size, oppositeMode, oppositeState))) break; } else { QIcon::Mode oppositeMode = (mode == QIcon::Normal) ? QIcon::Active : QIcon::Normal; if ((pe = tryMatch(size, oppositeMode, state))) break; if ((pe = tryMatch(size, mode, oppositeState))) break; if ((pe = tryMatch(size, oppositeMode, oppositeState))) break; if ((pe = tryMatch(size, QIcon::Disabled, state))) break; if ((pe = tryMatch(size, QIcon::Selected, state))) break; if ((pe = tryMatch(size, QIcon::Disabled, oppositeState))) break; if ((pe = tryMatch(size, QIcon::Selected, oppositeState))) break; } if (!pe) return pe; } if (sizeOnly ? (pe->size.isNull() || !pe->size.isValid()) : pe->pixmap.isNull()) { pe->pixmap = QPixmap(pe->fileName); if (!pe->pixmap.isNull()) pe->size = pe->pixmap.size(); } return pe; } QPixmap QPixmapIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state) { QPixmap pm; QPixmapIconEngineEntry *pe = bestMatch(size, mode, state, false); if (pe) pm = pe->pixmap; if (pm.isNull()) { int idx = pixmaps.count(); while (--idx >= 0) { if (pe == &pixmaps[idx]) { pixmaps.remove(idx); break; } } if (pixmaps.isEmpty()) return pm; else return pixmap(size, mode, state); } QSize actualSize = pm.size(); if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height())) actualSize.scale(size, Qt::KeepAspectRatio); QString key = QLatin1String("$qt_icon_") + QString::number(pm.cacheKey()) + QString::number(pe->mode) + QString::number(QApplication::palette().cacheKey()) + QLatin1Char('_') + QString::number(actualSize.width()) + QLatin1Char('_') + QString::number(actualSize.height()) + QLatin1Char('_'); if (mode == QIcon::Active) { if (QPixmapCache::find(key + QString::number(mode), pm)) return pm; // horray if (QPixmapCache::find(key + QString::number(QIcon::Normal), pm)) { QStyleOption opt(0); opt.palette = QApplication::palette(); QPixmap active = QApplication::style()->generatedIconPixmap(QIcon::Active, pm, &opt); if (pm.cacheKey() == active.cacheKey()) return pm; } } if (!QPixmapCache::find(key + QString::number(mode), pm)) { if (pm.size() != actualSize) pm = pm.scaled(actualSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation); if (pe->mode != mode && mode != QIcon::Normal) { QStyleOption opt(0); opt.palette = QApplication::palette(); QPixmap generated = QApplication::style()->generatedIconPixmap(mode, pm, &opt); if (!generated.isNull()) pm = generated; } QPixmapCache::insert(key + QString::number(mode), pm); } return pm; } QSize QPixmapIconEngine::actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state) { QSize actualSize; if (QPixmapIconEngineEntry *pe = bestMatch(size, mode, state, true)) actualSize = pe->size; if (actualSize.isNull()) return actualSize; if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height())) actualSize.scale(size, Qt::KeepAspectRatio); return actualSize; } void QPixmapIconEngine::addPixmap(const QPixmap &pixmap, QIcon::Mode mode, QIcon::State state) { if (!pixmap.isNull()) { QPixmapIconEngineEntry *pe = tryMatch(pixmap.size(), mode, state); if(pe && pe->size == pixmap.size()) { pe->pixmap = pixmap; pe->fileName.clear(); } else { pixmaps += QPixmapIconEngineEntry(pixmap, mode, state); } } } void QPixmapIconEngine::addFile(const QString &fileName, const QSize &_size, QIcon::Mode mode, QIcon::State state) { if (!fileName.isEmpty()) { QSize size = _size; QPixmap pixmap; QString abs = fileName; if (fileName.at(0) != QLatin1Char(':')) abs = QFileInfo(fileName).absoluteFilePath(); for (int i = 0; i < pixmaps.count(); ++i) { if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) { QPixmapIconEngineEntry *pe = &pixmaps[i]; if(size == QSize()) { pixmap = QPixmap(abs); size = pixmap.size(); } if (pe->size == QSize() && pe->pixmap.isNull()) { pe->pixmap = QPixmap(pe->fileName); pe->size = pe->pixmap.size(); } if(pe->size == size) { pe->pixmap = pixmap; pe->fileName = abs; return; } } } QPixmapIconEngineEntry e(abs, size, mode, state); e.pixmap = pixmap; pixmaps += e; } } QString QPixmapIconEngine::key() const { return QLatin1String("QPixmapIconEngine"); } QIconEngineV2 *QPixmapIconEngine::clone() const { return new QPixmapIconEngine(*this); } bool QPixmapIconEngine::read(QDataStream &in) { int num_entries; 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 { QPixmapIconEngineEntry pe(fileName, sz, QIcon::Mode(mode), QIcon::State(state)); pe.pixmap = pm; pixmaps += pe; } } 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; } void QPixmapIconEngine::virtual_hook(int id, void *data) { switch (id) { case QIconEngineV2::AvailableSizesHook: { QIconEngineV2::AvailableSizesArgument &arg = *reinterpret_cast(data); arg.sizes.clear(); for (int i = 0; i < pixmaps.size(); ++i) { QPixmapIconEngineEntry &pe = pixmaps[i]; if (pe.size == QSize() && pe.pixmap.isNull()) { pe.pixmap = QPixmap(pe.fileName); pe.size = pe.pixmap.size(); } if (pe.mode == arg.mode && pe.state == arg.state && !pe.size.isEmpty()) arg.sizes.push_back(pe.size); } break; } default: QIconEngineV2::virtual_hook(id, data); } } #if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader, (QIconEngineFactoryInterface_iid, QLatin1String("/iconengines"), Qt::CaseInsensitive)) Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loaderV2, (QIconEngineFactoryInterfaceV2_iid, 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: \snippet doc/src/snippets/code/src_gui_image_qicon.cpp 0 To undo a QIcon, simply set a null icon in its place: \snippet doc/src/snippets/code/src_gui_image_qicon.cpp 1 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, making it possible for third parties to provide additional icon engines to those included with Qt. \note Since Qt 4.2, an icon engine that supports SVG is included. \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: \snippet doc/src/snippets/code/src_gui_image_qicon.cpp 2 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) { 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; d->v1RefCount = new QAtomicInt(1); } /*! 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) { if (other.d) other.d->ref.ref(); if (d && !d->ref.deref()) delete d; d = other.d; 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) return QSize(); return d->engine->actualSize(size, mode, state); } /*! Uses the \a painter to paint the icon with specified \a alignment, required \a mode, and \a state into the rectangle \a rect. \sa actualSize(), pixmap() */ void QIcon::paint(QPainter *painter, const QRect &rect, Qt::Alignment alignment, Mode mode, State state) const { if (!d || !painter) return; QRect alignedRect = QStyle::alignedRect(painter->layoutDirection(), alignment, d->engine->actualSize(rect.size(), mode, state), rect); d->engine->paint(painter, alignedRect, mode, state); } /*! \fn void QIcon::paint(QPainter *painter, int x, int y, int w, int h, Qt::Alignment alignment, Mode mode, State state) const \overload Paints the icon into the rectangle QRect(\a x, \a y, \a w, \a h). */ /*! Returns true if the icon is empty; otherwise returns false. An icon is empty if it has neither a pixmap nor a filename. Note: Even a non-null icon might not be able to create valid pixmaps, eg. if the file does not exist or cannot be read. */ bool QIcon::isNull() const { return !d; } /*!\internal */ bool QIcon::isDetached() const { return !d || d->ref == 1; } /*! \internal */ void QIcon::detach() { if (d) { if (d->ref != 1) { QIconPrivate *x = new QIconPrivate; if (d->engine_version > 1) { QIconEngineV2 *engine = static_cast(d->engine); x->engine = engine->clone(); } else { x->engine = d->engine; x->v1RefCount = d->v1RefCount; x->v1RefCount->ref(); } x->engine_version = d->engine_version; if (!d->ref.deref()) delete d; d = x; } ++d->detach_no; } } /*! Adds \a pixmap to the icon, as a specialization for \a mode and \a state. Custom icon engines are free to ignore additionally added pixmaps. \sa addFile() */ void QIcon::addPixmap(const QPixmap &pixmap, Mode mode, State state) { if (pixmap.isNull()) return; if (!d) { d = new QIconPrivate; d->engine = new QPixmapIconEngine; } else { detach(); } d->engine->addPixmap(pixmap, mode, state); } /*! Adds an image from the file with the given \a fileName to the icon, as a specialization for \a size, \a mode and \a state. The file will be loaded on demand. Note: custom icon engines are free to ignore additionally added pixmaps. 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. Note: When you add a non-empty filename to a QIcon, the icon becomes non-null, even if the file doesn't exist or points to a corrupt file. \sa addPixmap() */ void QIcon::addFile(const QString &fileName, const QSize &size, Mode mode, State state) { if (fileName.isEmpty()) return; if (!d) { #if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) QFileInfo info(fileName); QString suffix = info.suffix(); if (!suffix.isEmpty()) { // first try version 2 engines.. if (QIconEngineFactoryInterfaceV2 *factory = qobject_cast(loaderV2()->instance(suffix))) { if (QIconEngine *engine = factory->create(fileName)) { d = new QIconPrivate; d->engine = engine; } } // ..then fall back and try to load version 1 engines if (!d) { if (QIconEngineFactoryInterface *factory = qobject_cast(loader()->instance(suffix))) { if (QIconEngine *engine = factory->create(fileName)) { d = new QIconPrivate; d->engine = engine; d->engine_version = 1; d->v1RefCount = new QAtomicInt(1); } } } } #endif // ...then fall back to the default engine if (!d) { d = new QIconPrivate; d->engine = new QPixmapIconEngine; } } else { detach(); } d->engine->addFile(fileName, size, mode, state); } /*! \since 4.5 Returns a list of available icon sizes for the specified \a mode and \a state. */ QList QIcon::availableSizes(Mode mode, State state) const { if (!d || !d->engine || d->engine_version < 2) return QList(); QIconEngineV2 *engine = static_cast(d->engine); return engine->availableSizes(mode, state); } /*! \since 4.6 Sets the search paths for icon themes to \a paths. \sa themeSearchPaths(), fromTheme() */ void QIcon::setThemeSearchPaths(const QStringList &paths) { QIconLoader::instance()->setThemeSearchPath(paths); } /*! \since 4.6 Returns the search paths for icon themes. The default value will depend on the platform: On X11, the search path will use the XDG_DATA_DIRS environment variable if available. On Windows the search path defaults to [Application Directory]/icons On Mac the default search path will search in the [Contents/Resources/icons] part of the application bundle. \sa setThemeSearchPaths(), fromTheme() */ QStringList QIcon::themeSearchPaths() { return QIconLoader::instance()->themeSearchPaths(); } /*! \since 4.6 Sets the current icon theme. The name should correspond to a directory name in the current \ themeSearchPath() containing an index.theme file describing it's contents.. */ void QIcon::setThemeName(const QString &path) { QIconLoader::instance()->setThemeName(path); } /*! \since 4.6 Returns the name of the current icon theme. On X11, the current icon theme depends on your desktop settings. On other platforms it is not set by default. \sa themeSearchPaths(), fromTheme(), hasThemeIcon() */ QString QIcon::themeName() { return QIconLoader::instance()->themeName(); } /*! \since 4.6 Returns the QIcon corresponding to \a name in the current icon theme. If no such icon is found in the current theme \a fallback is return instead. To use an icon theme on Windows or Mac, you will need to bundle a compliant theme with your application and make sure it is located in your themeSarchPaths. The lastest version of the freedesktop icon specification and naming spesification can be obtained here: http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html To fetch an icon from the current icon theme: \snippet doc/src/snippets/code/src_gui_image_qicon.cpp 3 Or if you want to provide a guaranteed fallback for platforms that do not support theme icons, you can use the second argument: \snippet doc/src/snippets/code/src_gui_image_qicon.cpp 4 \note By default, only X11 will support themed icons. In order to use themed icons on Mac and Windows, you will have to bundle a compliant theme in one of your themeSearchPaths() and set the appropriate themeName(). \sa themeName(), themeSearchPaths() */ QIcon QIcon::fromTheme(const QString &name, const QIcon &fallback) { static QCache iconCache; QIcon icon; #ifdef Q_WS_X11 if (X11->desktopEnvironment == DE_KDE) { icon = QKde::kdeIcon(name); if (!icon.isNull()) return icon; } #endif if (iconCache.contains(name)) { icon = *iconCache.object(name); } else { QIcon *cachedIcon = new QIcon(new QIconLoaderEngine(name)); iconCache.insert(name, cachedIcon); icon = *cachedIcon; } if (icon.availableSizes().isEmpty()) return fallback; return icon; } /*! \since 4.6 Returns true if there is an icon available for a \a name in the current icon theme, otherwise returns false. \sa themeSearchPaths(), fromTheme() */ bool QIcon::hasThemeIcon(const QString &name) { QIcon icon = fromTheme(name); return !icon.isNull(); } /***************************************************************************** QIcon stream functions *****************************************************************************/ #if !defined(QT_NO_DATASTREAM) /*! \fn QDataStream &operator<<(QDataStream &stream, const QIcon &icon) \relates QIcon \since 4.2 Writes the given \a icon to the given \a stream as a PNG image. If the icon contains more than one image, all images will be written to the stream. Note that writing the stream to a file will not produce a valid image file. */ QDataStream &operator<<(QDataStream &s, const QIcon &icon) { if (s.version() >= QDataStream::Qt_4_3) { if (icon.isNull()) { s << QString(); } else { if (icon.d->engine_version > 1) { QIconEngineV2 *engine = static_cast(icon.d->engine); s << engine->key(); engine->write(s); } else { // not really supported qWarning("QIcon: Cannot stream QIconEngine. Use QIconEngineV2 instead."); } } } else if (s.version() == QDataStream::Qt_4_2) { if (icon.isNull()) { s << 0; } else { QPixmapIconEngine *engine = static_cast(icon.d->engine); int num_entries = engine->pixmaps.size(); s << num_entries; for (int i=0; i < num_entries; ++i) { s << engine->pixmaps.at(i).pixmap; s << engine->pixmaps.at(i).fileName; s << engine->pixmaps.at(i).size; s << (uint) engine->pixmaps.at(i).mode; s << (uint) engine->pixmaps.at(i).state; } } } else { s << QPixmap(icon.pixmap(22,22)); } return s; } /*! \fn QDataStream &operator>>(QDataStream &stream, QIcon &icon) \relates QIcon \since 4.2 Reads an image, or a set of images, from the given \a stream into the given \a icon. */ QDataStream &operator>>(QDataStream &s, QIcon &icon) { if (s.version() >= QDataStream::Qt_4_3) { icon = QIcon(); QString key; s >> key; if (key == QLatin1String("QPixmapIconEngine")) { icon.d = new QIconPrivate; QIconEngineV2 *engine = new QPixmapIconEngine; icon.d->engine = engine; engine->read(s); } else if (key == QLatin1String("QIconLoaderEngine")) { icon.d = new QIconPrivate; QIconEngineV2 *engine = new QIconLoaderEngine(); icon.d->engine = engine; engine->read(s); #if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) } else if (QIconEngineFactoryInterfaceV2 *factory = qobject_cast(loaderV2()->instance(key))) { if (QIconEngineV2 *engine= factory->create()) { icon.d = new QIconPrivate; icon.d->engine = engine; engine->read(s); } #endif } } else if (s.version() == QDataStream::Qt_4_2) { icon = QIcon(); int num_entries; QPixmap pm; QString fileName; QSize sz; uint mode; uint state; s >> num_entries; for (int i=0; i < num_entries; ++i) { s >> pm; s >> fileName; s >> sz; s >> mode; s >> state; if (pm.isNull()) icon.addFile(fileName, sz, QIcon::Mode(mode), QIcon::State(state)); else icon.addPixmap(pm, QIcon::Mode(mode), QIcon::State(state)); } } else { QPixmap pm; s >> pm; icon.addPixmap(pm); } return s; } #endif //QT_NO_DATASTREAM #ifdef QT3_SUPPORT static int widths[2] = { 22, 32 }; static int heights[2] = { 22, 32 }; static QSize pixmapSizeHelper(QIcon::Size which) { int i = 0; if (which == QIcon::Large) i = 1; return QSize(widths[i], heights[i]); } /*! \enum QIcon::Size \compat \value Small Use QStyle::pixelMetric(QStyle::PM_SmallIconSize) instead. \value Large Use QStyle::pixelMetric(QStyle::PM_LargeIconSize) instead. \value Automatic N/A. */ /*! Use pixmap(QSize(...), \a mode, \a state), where the first argument is an appropriate QSize instead of a \l Size value. \sa pixmapSize() */ QPixmap QIcon::pixmap(Size size, Mode mode, State state) const { return pixmap(pixmapSizeHelper(size), mode, state); } /*! Use pixmap(QSize(...), mode, \a state), where the first argument is an appropriate QSize instead of a \l Size value, and the second argument is QIcon::Normal or QIcon::Disabled, depending on the value of \a enabled. \sa pixmapSize() */ QPixmap QIcon::pixmap(Size size, bool enabled, State state) const { return pixmap(pixmapSizeHelper(size), enabled ? Normal : Disabled, state); } /*! Use one of the other pixmap() overloads. */ QPixmap QIcon::pixmap() const { return pixmap(pixmapSizeHelper(Small), Normal, Off); } /*! The pixmap() function now takes a QSize instead of a QIcon::Size, so there is no need for this function in new code. */ void QIcon::setPixmapSize(Size which, const QSize &size) { int i = 0; if (which == Large) i = 1; widths[i] = size.width(); heights[i] = size.height(); } /*! Use QStyle::pixelMetric() with QStyle::PM_SmallIconSize or QStyle::PM_LargeIconSize as the first argument, depending on \a which. */ QSize QIcon::pixmapSize(Size which) { return pixmapSizeHelper(which); } /*! \fn void QIcon::reset(const QPixmap &pixmap, Size size) Use the constructor that takes a QPixmap and operator=(). */ /*! \fn void QIcon::setPixmap(const QPixmap &pixmap, Size size, Mode mode, State state) Use addPixmap(\a pixmap, \a mode, \a state) instead. The \a size parameter is ignored. */ /*! \fn void QIcon::setPixmap(const QString &fileName, Size size, Mode mode, State state) Use addFile(\a fileName, \a mode, \a state) instead. The \a size parameter is ignored. */ #endif // QT3_SUPPORT /*! \fn DataPtr &QIcon::data_ptr() \internal */ /*! \typedef QIcon::DataPtr \internal */ QT_END_NAMESPACE