/
qdeclarativeengine.cpp
1683 lines (1379 loc) · 52.6 KB
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qdeclarativeengine.cpp
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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 1.1, 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "private/qdeclarativeengine_p.h"
#include "qdeclarativeengine.h"
#include "private/qdeclarativecontext_p.h"
#include "private/qdeclarativecompiler_p.h"
#include "qdeclarative.h"
#include "qdeclarativecontext.h"
#include "qdeclarativeexpression.h"
#include "qdeclarativecomponent.h"
#include "private/qdeclarativebinding_p_p.h"
#include "private/qdeclarativevme_p.h"
#include "private/qdeclarativeenginedebug_p.h"
#include "private/qdeclarativestringconverters_p.h"
#include "private/qdeclarativexmlhttprequest_p.h"
#include "private/qdeclarativesqldatabase_p.h"
#include "qdeclarativescriptstring.h"
#include "private/qdeclarativeglobal_p.h"
#include "private/qdeclarativeworkerscript_p.h"
#include "private/qdeclarativecomponent_p.h"
#include "qdeclarativenetworkaccessmanagerfactory.h"
#include "qdeclarativeimageprovider.h"
#include "private/qdeclarativedirparser_p.h"
#include "qdeclarativeextensioninterface.h"
#include "private/qdeclarativelist_p.h"
#include "private/qdeclarativetypenamecache_p.h"
#include "private/qdeclarativenotifier_p.h"
#include "private/qdeclarativedebugtrace_p.h"
#include "private/qdeclarativeapplication_p.h"
#include "private/qv8debugservice_p.h"
#include <QtCore/qmetaobject.h>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QNetworkAccessManager>
#include <QDesktopServices>
#include <QTimer>
#include <QList>
#include <QPair>
#include <QDebug>
#include <QMetaObject>
#include <QStack>
#include <QMap>
#include <QPluginLoader>
#include <QtGui/qfontdatabase.h>
#include <QtCore/qlibraryinfo.h>
#include <QtCore/qthreadstorage.h>
#include <QtCore/qthread.h>
#include <QtCore/qcoreapplication.h>
#include <QtCore/qdir.h>
#include <QtCore/qmutex.h>
#include <QtGui/qcolor.h>
#include <QtGui/qvector3d.h>
#include <QtCore/qcryptographichash.h>
#include <private/qobject_p.h>
#include <private/qdeclarativeutilmodule_p.h>
#include <private/qsgitemsmodule_p.h>
#include <private/qsgparticlesmodule_p.h>
#include <qsgtexture.h>
#ifdef Q_OS_WIN // for %APPDATA%
#include <qt_windows.h>
#include <qlibrary.h>
#include <windows.h>
#define CSIDL_APPDATA 0x001a // <username>\Application Data
#endif
Q_DECLARE_METATYPE(QDeclarativeProperty)
QT_BEGIN_NAMESPACE
void qmlRegisterBaseTypes(const char *uri, int versionMajor, int versionMinor)
{
QDeclarativeEnginePrivate::registerBaseTypes(uri, versionMajor, versionMinor);
QDeclarativeValueTypeFactory::registerBaseTypes(uri, versionMajor, versionMinor);
QDeclarativeUtilModule::registerBaseTypes(uri, versionMajor, versionMinor);
}
/*!
\qmlclass QtObject QObject
\ingroup qml-utility-elements
\since 4.7
\brief The QtObject element is the most basic element in QML.
The QtObject element is a non-visual element which contains only the
objectName property.
It can be useful to create a QtObject if you need an extremely
lightweight element to enclose a set of custom properties:
\snippet doc/src/snippets/declarative/qtobject.qml 0
It can also be useful for C++ integration, as it is just a plain
QObject. See the QObject documentation for further details.
*/
/*!
\qmlproperty string QML:QtObject::objectName
This property holds the QObject::objectName for this specific object instance.
This allows a C++ application to locate an item within a QML component
using the QObject::findChild() method. For example, the following C++
application locates the child \l Rectangle item and dynamically changes its
\c color value:
\qml
// MyRect.qml
import QtQuick 1.0
Item {
width: 200; height: 200
Rectangle {
anchors.fill: parent
color: "red"
objectName: "myRect"
}
}
\endqml
\code
// main.cpp
QDeclarativeView view;
view.setSource(QUrl::fromLocalFile("MyRect.qml"));
view.show();
QDeclarativeItem *item = view.rootObject()->findChild<QDeclarativeItem*>("myRect");
if (item)
item->setProperty("color", QColor(Qt::yellow));
\endcode
*/
static bool qt_QmlQtModule_registered = false;
bool QDeclarativeEnginePrivate::qml_debugging_enabled = false;
void QDeclarativeEnginePrivate::registerBaseTypes(const char *uri, int versionMajor, int versionMinor)
{
qmlRegisterType<QDeclarativeComponent>(uri,versionMajor,versionMinor,"Component");
qmlRegisterType<QObject>(uri,versionMajor,versionMinor,"QtObject");
qmlRegisterType<QDeclarativeWorkerScript>(uri,versionMajor,versionMinor,"WorkerScript");
}
void QDeclarativeEnginePrivate::defineModule()
{
registerBaseTypes("QtQuick", 2, 0);
qmlRegisterType<QDeclarativeBinding>();
}
/*!
\qmlclass QML:Qt QDeclarativeEnginePrivate
\ingroup qml-utility-elements
\brief The QML global Qt object provides useful enums and functions from Qt.
\keyword QmlGlobalQtObject
\brief The \c Qt object provides useful enums and functions from Qt, for use in all QML files.
The \c Qt object is a global object with utility functions, properties and enums.
It is not instantiable; to use it, call the members of the global \c Qt object directly.
For example:
\qml
import QtQuick 1.0
Text {
color: Qt.rgba(1, 0, 0, 1)
text: Qt.md5("hello, world")
}
\endqml
\section1 Enums
The Qt object contains the enums available in the \l {Qt Namespace}. For example, you can access
the \l Qt::LeftButton and \l Qt::RightButton enum values as \c Qt.LeftButton and \c Qt.RightButton.
\section1 Types
The Qt object also contains helper functions for creating objects of specific
data types. This is primarily useful when setting the properties of an item
when the property has one of the following types:
\list
\o \c color - use \l{QML:Qt::rgba()}{Qt.rgba()}, \l{QML:Qt::hsla()}{Qt.hsla()}, \l{QML:Qt::darker()}{Qt.darker()}, \l{QML:Qt::lighter()}{Qt.lighter()} or \l{QML:Qt::tint()}{Qt.tint()}
\o \c rect - use \l{QML:Qt::rect()}{Qt.rect()}
\o \c point - use \l{QML:Qt::point()}{Qt.point()}
\o \c size - use \l{QML:Qt::size()}{Qt.size()}
\o \c vector3d - use \l{QML:Qt::vector3d()}{Qt.vector3d()}
\endlist
There are also string based constructors for these types. See \l{qdeclarativebasictypes.html}{QML Basic Types} for more information.
\section1 Date/Time Formatters
The Qt object contains several functions for formatting QDateTime, QDate and QTime values.
\list
\o \l{QML:Qt::formatDateTime}{string Qt.formatDateTime(datetime date, variant format)}
\o \l{QML:Qt::formatDate}{string Qt.formatDate(datetime date, variant format)}
\o \l{QML:Qt::formatTime}{string Qt.formatTime(datetime date, variant format)}
\endlist
The format specification is described at \l{QML:Qt::formatDateTime}{Qt.formatDateTime}.
\section1 Dynamic Object Creation
The following functions on the global object allow you to dynamically create QML
items from files or strings. See \l{Dynamic Object Management in QML} for an overview
of their use.
\list
\o \l{QML:Qt::createComponent()}{object Qt.createComponent(url)}
\o \l{QML:Qt::createQmlObject()}{object Qt.createQmlObject(string qml, object parent, string filepath)}
\endlist
*/
/*!
\qmlproperty object QML:Qt::application
\since QtQuick 1.1
The \c application object provides access to global application state
properties shared by many QML components.
Its properties are:
\table
\row
\o \c application.active
\o
This read-only property indicates whether the application is the top-most and focused
application, and the user is able to interact with the application. The property
is false when the application is in the background, the device keylock or screen
saver is active, the screen backlight is turned off, or the global system dialog
is being displayed on top of the application. It can be used for stopping and
pausing animations, timers and active processing of data in order to save device
battery power and free device memory and processor load when the application is not
active.
\row
\o \c application.layoutDirection
\o
This read-only property can be used to query the default layout direction of the
application. On system start-up, the default layout direction depends on the
application's language. The property has a value of \c Qt.RightToLeft in locales
where text and graphic elements are read from right to left, and \c Qt.LeftToRight
where the reading direction flows from left to right. You can bind to this
property to customize your application layouts to support both layout directions.
Possible values are:
\list
\o Qt.LeftToRight - Text and graphics elements should be positioned
from left to right.
\o Qt.RightToLeft - Text and graphics elements should be positioned
from right to left.
\endlist
\endtable
The following example uses the \c application object to indicate
whether the application is currently active:
\snippet doc/src/snippets/declarative/application.qml document
*/
/*!
\qmlmethod object Qt::include(string url, jsobject callback)
Includes another JavaScript file. This method can only be used from within JavaScript files,
and not regular QML files.
This imports all functions from \a url into the current script's namespace.
Qt.include() returns an object that describes the status of the operation. The object has
a single property, \c {status}, that is set to one of the following values:
\table
\header \o Symbol \o Value \o Description
\row \o result.OK \o 0 \o The include completed successfully.
\row \o result.LOADING \o 1 \o Data is being loaded from the network.
\row \o result.NETWORK_ERROR \o 2 \o A network error occurred while fetching the url.
\row \o result.EXCEPTION \o 3 \o A JavaScript exception occurred while executing the included code.
An additional \c exception property will be set in this case.
\endtable
The \c status property will be updated as the operation progresses.
If provided, \a callback is invoked when the operation completes. The callback is passed
the same object as is returned from the Qt.include() call.
*/
// Qt.include() is implemented in qv8include.cpp
QDeclarativeEnginePrivate::QDeclarativeEnginePrivate(QDeclarativeEngine *e)
: captureProperties(false), rootContext(0), isDebugging(false),
outputWarningsToStdErr(true), sharedContext(0), sharedScope(0),
cleanup(0), erroredBindings(0), inProgressCreations(0),
workerScriptEngine(0), componentAttached(0), inBeginCreate(false),
networkAccessManager(0), networkAccessManagerFactory(0),
scarceResourcesRefCount(0), typeLoader(e), importDatabase(e), uniqueId(1),
sgContext(0)
{
if (!qt_QmlQtModule_registered) {
qt_QmlQtModule_registered = true;
QDeclarativeUtilModule::defineModule();
QDeclarativeEnginePrivate::defineModule();
QSGItemsModule::defineModule();
QSGParticlesModule::defineModule();
QDeclarativeValueTypeFactory::registerValueTypes();
}
}
QDeclarativeEnginePrivate::~QDeclarativeEnginePrivate()
{
Q_ASSERT(inProgressCreations == 0);
Q_ASSERT(bindValues.isEmpty());
Q_ASSERT(parserStatus.isEmpty());
while (cleanup) {
QDeclarativeCleanup *c = cleanup;
cleanup = c->next;
if (cleanup) cleanup->prev = &cleanup;
c->next = 0;
c->prev = 0;
c->clear();
}
delete rootContext;
rootContext = 0;
for(QHash<int, QDeclarativeCompiledData*>::ConstIterator iter = m_compositeTypes.constBegin(); iter != m_compositeTypes.constEnd(); ++iter)
(*iter)->release();
for(QHash<const QMetaObject *, QDeclarativePropertyCache *>::Iterator iter = propertyCache.begin(); iter != propertyCache.end(); ++iter)
(*iter)->release();
for(QHash<QPair<QDeclarativeType *, int>, QDeclarativePropertyCache *>::Iterator iter = typePropertyCache.begin(); iter != typePropertyCache.end(); ++iter)
(*iter)->release();
for(QHash<QDeclarativeMetaType::ModuleApi, QDeclarativeMetaType::ModuleApiInstance *>::Iterator iter = moduleApiInstances.begin(); iter != moduleApiInstances.end(); ++iter) {
delete (*iter)->qobjectApi;
delete *iter;
}
}
void QDeclarativeEnginePrivate::clear(SimpleList<QDeclarativeAbstractBinding> &bvs)
{
bvs.clear();
}
void QDeclarativeEnginePrivate::clear(SimpleList<QDeclarativeParserStatus> &pss)
{
for (int ii = 0; ii < pss.count; ++ii) {
QDeclarativeParserStatus *ps = pss.at(ii);
if(ps)
ps->d = 0;
}
pss.clear();
}
void QDeclarativePrivate::qdeclarativeelement_destructor(QObject *o)
{
QObjectPrivate *p = QObjectPrivate::get(o);
if (p->declarativeData) {
QDeclarativeData *d = static_cast<QDeclarativeData*>(p->declarativeData);
if (d->ownContext && d->context) {
d->context->destroy();
d->context = 0;
}
}
}
void QDeclarativeData::destroyed(QAbstractDeclarativeData *d, QObject *o)
{
static_cast<QDeclarativeData *>(d)->destroyed(o);
}
void QDeclarativeData::parentChanged(QAbstractDeclarativeData *d, QObject *o, QObject *p)
{
static_cast<QDeclarativeData *>(d)->parentChanged(o, p);
}
void QDeclarativeData::objectNameChanged(QAbstractDeclarativeData *d, QObject *o)
{
static_cast<QDeclarativeData *>(d)->objectNameChanged(o);
}
void QDeclarativeEnginePrivate::init()
{
Q_Q(QDeclarativeEngine);
qRegisterMetaType<QVariant>("QVariant");
qRegisterMetaType<QDeclarativeScriptString>("QDeclarativeScriptString");
qRegisterMetaType<QJSValue>("QJSValue");
qRegisterMetaType<QDeclarativeComponent::Status>("QDeclarativeComponent::Status");
qRegisterMetaType<QList<QObject*> >("QList<QObject*>");
qRegisterMetaType<QList<int> >("QList<int>");
qRegisterMetaType<QDeclarativeV8Handle>("QDeclarativeV8Handle");
QDeclarativeData::init();
v8engine()->setEngine(q);
rootContext = new QDeclarativeContext(q,true);
if (QCoreApplication::instance()->thread() == q->thread() &&
QDeclarativeEngineDebugServer::isDebuggingEnabled()) {
isDebugging = true;
QDeclarativeEngineDebugServer::instance()->addEngine(q);
QV8DebugService::instance()->addEngine(q);
}
}
QDeclarativeWorkerScriptEngine *QDeclarativeEnginePrivate::getWorkerScriptEngine()
{
Q_Q(QDeclarativeEngine);
if (!workerScriptEngine)
workerScriptEngine = new QDeclarativeWorkerScriptEngine(q);
return workerScriptEngine;
}
/*!
\class QDeclarativeEngine
\since 4.7
\brief The QDeclarativeEngine class provides an environment for instantiating QML components.
\mainclass
Each QML component is instantiated in a QDeclarativeContext.
QDeclarativeContext's are essential for passing data to QML
components. In QML, contexts are arranged hierarchically and this
hierarchy is managed by the QDeclarativeEngine.
Prior to creating any QML components, an application must have
created a QDeclarativeEngine to gain access to a QML context. The
following example shows how to create a simple Text item.
\code
QDeclarativeEngine engine;
QDeclarativeComponent component(&engine);
component.setData("import QtQuick 1.0\nText { text: \"Hello world!\" }", QUrl());
QDeclarativeItem *item = qobject_cast<QDeclarativeItem *>(component.create());
//add item to view, etc
...
\endcode
In this case, the Text item will be created in the engine's
\l {QDeclarativeEngine::rootContext()}{root context}.
\sa QDeclarativeComponent QDeclarativeContext
*/
/*!
Create a new QDeclarativeEngine with the given \a parent.
*/
QDeclarativeEngine::QDeclarativeEngine(QObject *parent)
: QJSEngine(*new QDeclarativeEnginePrivate(this), parent)
{
Q_D(QDeclarativeEngine);
d->init();
}
/*!
Destroys the QDeclarativeEngine.
Any QDeclarativeContext's created on this engine will be
invalidated, but not destroyed (unless they are parented to the
QDeclarativeEngine object).
*/
QDeclarativeEngine::~QDeclarativeEngine()
{
Q_D(QDeclarativeEngine);
if (d->isDebugging)
QDeclarativeEngineDebugServer::instance()->remEngine(this);
// if we are the parent of any of the qobject module api instances,
// we need to remove them from our internal list, in order to prevent
// a segfault in engine private dtor.
QList<QDeclarativeMetaType::ModuleApi> keys = d->moduleApiInstances.keys();
QObject *currQObjectApi = 0;
QDeclarativeMetaType::ModuleApiInstance *currInstance = 0;
foreach (const QDeclarativeMetaType::ModuleApi &key, keys) {
currInstance = d->moduleApiInstances.value(key);
currQObjectApi = currInstance->qobjectApi;
if (this->children().contains(currQObjectApi)) {
delete currQObjectApi;
delete currInstance;
d->moduleApiInstances.remove(key);
}
}
}
/*! \fn void QDeclarativeEngine::quit()
This signal is emitted when the QML loaded by the engine would like to quit.
*/
/*! \fn void QDeclarativeEngine::warnings(const QList<QDeclarativeError> &warnings)
This signal is emitted when \a warnings messages are generated by QML.
*/
/*!
Clears the engine's internal component cache.
Normally the QDeclarativeEngine caches components loaded from qml
files. This method clears this cache and forces the component to be
reloaded.
*/
void QDeclarativeEngine::clearComponentCache()
{
Q_D(QDeclarativeEngine);
d->typeLoader.clearCache();
}
/*!
Returns the engine's root context.
The root context is automatically created by the QDeclarativeEngine.
Data that should be available to all QML component instances
instantiated by the engine should be put in the root context.
Additional data that should only be available to a subset of
component instances should be added to sub-contexts parented to the
root context.
*/
QDeclarativeContext *QDeclarativeEngine::rootContext() const
{
Q_D(const QDeclarativeEngine);
return d->rootContext;
}
/*!
Sets the \a factory to use for creating QNetworkAccessManager(s).
QNetworkAccessManager is used for all network access by QML. By
implementing a factory it is possible to create custom
QNetworkAccessManager with specialized caching, proxy and cookie
support.
The factory must be set before executing the engine.
*/
void QDeclarativeEngine::setNetworkAccessManagerFactory(QDeclarativeNetworkAccessManagerFactory *factory)
{
Q_D(QDeclarativeEngine);
QMutexLocker locker(&d->mutex);
d->networkAccessManagerFactory = factory;
}
/*!
Returns the current QDeclarativeNetworkAccessManagerFactory.
\sa setNetworkAccessManagerFactory()
*/
QDeclarativeNetworkAccessManagerFactory *QDeclarativeEngine::networkAccessManagerFactory() const
{
Q_D(const QDeclarativeEngine);
return d->networkAccessManagerFactory;
}
QNetworkAccessManager *QDeclarativeEnginePrivate::createNetworkAccessManager(QObject *parent) const
{
QMutexLocker locker(&mutex);
QNetworkAccessManager *nam;
if (networkAccessManagerFactory) {
nam = networkAccessManagerFactory->create(parent);
} else {
nam = new QNetworkAccessManager(parent);
}
return nam;
}
QNetworkAccessManager *QDeclarativeEnginePrivate::getNetworkAccessManager() const
{
Q_Q(const QDeclarativeEngine);
if (!networkAccessManager)
networkAccessManager = createNetworkAccessManager(const_cast<QDeclarativeEngine*>(q));
return networkAccessManager;
}
/*!
Returns a common QNetworkAccessManager which can be used by any QML
element instantiated by this engine.
If a QDeclarativeNetworkAccessManagerFactory has been set and a
QNetworkAccessManager has not yet been created, the
QDeclarativeNetworkAccessManagerFactory will be used to create the
QNetworkAccessManager; otherwise the returned QNetworkAccessManager
will have no proxy or cache set.
\sa setNetworkAccessManagerFactory()
*/
QNetworkAccessManager *QDeclarativeEngine::networkAccessManager() const
{
Q_D(const QDeclarativeEngine);
return d->getNetworkAccessManager();
}
/*!
Sets the \a provider to use for images requested via the \e
image: url scheme, with host \a providerId. The QDeclarativeEngine
takes ownership of \a provider.
Image providers enable support for pixmap and threaded image
requests. See the QDeclarativeImageProvider documentation for details on
implementing and using image providers.
All required image providers should be added to the engine before any
QML sources files are loaded.
\sa removeImageProvider()
*/
void QDeclarativeEngine::addImageProvider(const QString &providerId, QDeclarativeImageProvider *provider)
{
Q_D(QDeclarativeEngine);
QMutexLocker locker(&d->mutex);
d->imageProviders.insert(providerId.toLower(), QSharedPointer<QDeclarativeImageProvider>(provider));
}
/*!
Returns the QDeclarativeImageProvider set for \a providerId.
*/
QDeclarativeImageProvider *QDeclarativeEngine::imageProvider(const QString &providerId) const
{
Q_D(const QDeclarativeEngine);
QMutexLocker locker(&d->mutex);
return d->imageProviders.value(providerId).data();
}
/*!
Removes the QDeclarativeImageProvider for \a providerId.
Returns the provider if it was found; otherwise returns 0.
\sa addImageProvider()
*/
void QDeclarativeEngine::removeImageProvider(const QString &providerId)
{
Q_D(QDeclarativeEngine);
QMutexLocker locker(&d->mutex);
d->imageProviders.take(providerId);
}
QDeclarativeImageProvider::ImageType QDeclarativeEnginePrivate::getImageProviderType(const QUrl &url)
{
QMutexLocker locker(&mutex);
QSharedPointer<QDeclarativeImageProvider> provider = imageProviders.value(url.host());
locker.unlock();
if (provider)
return provider->imageType();
return QDeclarativeImageProvider::Invalid;
}
QSGTexture *QDeclarativeEnginePrivate::getTextureFromProvider(const QUrl &url, QSize *size, const QSize& req_size)
{
QMutexLocker locker(&mutex);
QSharedPointer<QDeclarativeImageProvider> provider = imageProviders.value(url.host());
locker.unlock();
if (provider) {
QString imageId = url.toString(QUrl::RemoveScheme | QUrl::RemoveAuthority).mid(1);
return provider->requestTexture(imageId, size, req_size);
}
return 0;
}
QImage QDeclarativeEnginePrivate::getImageFromProvider(const QUrl &url, QSize *size, const QSize& req_size)
{
QMutexLocker locker(&mutex);
QImage image;
QSharedPointer<QDeclarativeImageProvider> provider = imageProviders.value(url.host());
locker.unlock();
if (provider) {
QString imageId = url.toString(QUrl::RemoveScheme | QUrl::RemoveAuthority).mid(1);
image = provider->requestImage(imageId, size, req_size);
}
return image;
}
QPixmap QDeclarativeEnginePrivate::getPixmapFromProvider(const QUrl &url, QSize *size, const QSize& req_size)
{
QMutexLocker locker(&mutex);
QPixmap pixmap;
QSharedPointer<QDeclarativeImageProvider> provider = imageProviders.value(url.host());
locker.unlock();
if (provider) {
QString imageId = url.toString(QUrl::RemoveScheme | QUrl::RemoveAuthority).mid(1);
pixmap = provider->requestPixmap(imageId, size, req_size);
}
return pixmap;
}
/*!
Return the base URL for this engine. The base URL is only used to
resolve components when a relative URL is passed to the
QDeclarativeComponent constructor.
If a base URL has not been explicitly set, this method returns the
application's current working directory.
\sa setBaseUrl()
*/
QUrl QDeclarativeEngine::baseUrl() const
{
Q_D(const QDeclarativeEngine);
if (d->baseUrl.isEmpty()) {
return QUrl::fromLocalFile(QDir::currentPath() + QDir::separator());
} else {
return d->baseUrl;
}
}
/*!
Set the base URL for this engine to \a url.
\sa baseUrl()
*/
void QDeclarativeEngine::setBaseUrl(const QUrl &url)
{
Q_D(QDeclarativeEngine);
d->baseUrl = url;
}
/*!
Returns true if warning messages will be output to stderr in addition
to being emitted by the warnings() signal, otherwise false.
The default value is true.
*/
bool QDeclarativeEngine::outputWarningsToStandardError() const
{
Q_D(const QDeclarativeEngine);
return d->outputWarningsToStdErr;
}
/*!
Set whether warning messages will be output to stderr to \a enabled.
If \a enabled is true, any warning messages generated by QML will be
output to stderr and emitted by the warnings() signal. If \a enabled
is false, on the warnings() signal will be emitted. This allows
applications to handle warning output themselves.
The default value is true.
*/
void QDeclarativeEngine::setOutputWarningsToStandardError(bool enabled)
{
Q_D(QDeclarativeEngine);
d->outputWarningsToStdErr = enabled;
}
/*!
Attempt to free unused memory.
*/
void QDeclarativeEngine::collectGarbage()
{
QV8Engine::gc();
}
/*!
Returns the QDeclarativeContext for the \a object, or 0 if no
context has been set.
When the QDeclarativeEngine instantiates a QObject, the context is
set automatically.
*/
QDeclarativeContext *QDeclarativeEngine::contextForObject(const QObject *object)
{
if(!object)
return 0;
QObjectPrivate *priv = QObjectPrivate::get(const_cast<QObject *>(object));
QDeclarativeData *data =
static_cast<QDeclarativeData *>(priv->declarativeData);
if (!data)
return 0;
else if (data->outerContext)
return data->outerContext->asQDeclarativeContext();
else
return 0;
}
/*!
Sets the QDeclarativeContext for the \a object to \a context.
If the \a object already has a context, a warning is
output, but the context is not changed.
When the QDeclarativeEngine instantiates a QObject, the context is
set automatically.
*/
void QDeclarativeEngine::setContextForObject(QObject *object, QDeclarativeContext *context)
{
if (!object || !context)
return;
QDeclarativeData *data = QDeclarativeData::get(object, true);
if (data->context) {
qWarning("QDeclarativeEngine::setContextForObject(): Object already has a QDeclarativeContext");
return;
}
QDeclarativeContextData *contextData = QDeclarativeContextData::get(context);
contextData->addObject(object);
}
/*!
\enum QDeclarativeEngine::ObjectOwnership
Ownership controls whether or not QML automatically destroys the
QObject when the object is garbage collected by the JavaScript
engine. The two ownership options are:
\value CppOwnership The object is owned by C++ code, and will
never be deleted by QML. The JavaScript destroy() method cannot be
used on objects with CppOwnership. This option is similar to
QScriptEngine::QtOwnership.
\value JavaScriptOwnership The object is owned by JavaScript.
When the object is returned to QML as the return value of a method
call or property access, QML will delete the object if there are no
remaining JavaScript references to it and it has no
QObject::parent(). This option is similar to
QScriptEngine::ScriptOwnership.
Generally an application doesn't need to set an object's ownership
explicitly. QML uses a heuristic to set the default object
ownership. By default, an object that is created by QML has
JavaScriptOwnership. The exception to this are the root objects
created by calling QDeclarativeCompnent::create() or
QDeclarativeComponent::beginCreate() which have CppOwnership by
default. The ownership of these root-level objects is considered to
have been transferred to the C++ caller.
Objects not-created by QML have CppOwnership by default. The
exception to this is objects returned from a C++ method call. The
ownership of these objects is passed to JavaScript.
Calling setObjectOwnership() overrides the default ownership
heuristic used by QML.
*/
/*!
Sets the \a ownership of \a object.
*/
void QDeclarativeEngine::setObjectOwnership(QObject *object, ObjectOwnership ownership)
{
if (!object)
return;
QDeclarativeData *ddata = QDeclarativeData::get(object, true);
if (!ddata)
return;
ddata->indestructible = (ownership == CppOwnership)?true:false;
ddata->explicitIndestructibleSet = true;
}
/*!
Returns the ownership of \a object.
*/
QDeclarativeEngine::ObjectOwnership QDeclarativeEngine::objectOwnership(QObject *object)
{
if (!object)
return CppOwnership;
QDeclarativeData *ddata = QDeclarativeData::get(object, false);
if (!ddata)
return CppOwnership;
else
return ddata->indestructible?CppOwnership:JavaScriptOwnership;
}
Q_AUTOTEST_EXPORT void qmlExecuteDeferred(QObject *object)
{
QDeclarativeData *data = QDeclarativeData::get(object);
if (data && data->deferredComponent) {
if (QDeclarativeDebugService::isDebuggingEnabled()) {
QDeclarativeDebugTrace::startRange(QDeclarativeDebugTrace::Creating);
QDeclarativeType *type = QDeclarativeMetaType::qmlType(object->metaObject());
QString typeName = type ? QLatin1String(type->qmlTypeName()) : QString::fromLatin1(object->metaObject()->className());
QDeclarativeDebugTrace::rangeData(QDeclarativeDebugTrace::Creating, typeName);
if (data->outerContext)
QDeclarativeDebugTrace::rangeLocation(QDeclarativeDebugTrace::Creating, data->outerContext->url, data->lineNumber);
}
QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(data->context->engine);
QDeclarativeComponentPrivate::ConstructionState state;
QDeclarativeComponentPrivate::beginDeferred(ep, object, &state);
data->deferredComponent->release();
data->deferredComponent = 0;
QDeclarativeComponentPrivate::complete(ep, &state);
QDeclarativeDebugTrace::endRange(QDeclarativeDebugTrace::Creating);
}
}
QDeclarativeContext *qmlContext(const QObject *obj)
{
return QDeclarativeEngine::contextForObject(obj);
}
QDeclarativeEngine *qmlEngine(const QObject *obj)
{
QDeclarativeContext *context = QDeclarativeEngine::contextForObject(obj);
return context?context->engine():0;
}
QObject *qmlAttachedPropertiesObjectById(int id, const QObject *object, bool create)
{
QDeclarativeData *data = QDeclarativeData::get(object);
if (!data)
return 0; // Attached properties are only on objects created by QML
QObject *rv = data->hasExtendedData()?data->attachedProperties()->value(id):0;
if (rv || !create)
return rv;
QDeclarativeAttachedPropertiesFunc pf = QDeclarativeMetaType::attachedPropertiesFuncById(id);
if (!pf)
return 0;
rv = pf(const_cast<QObject *>(object));
if (rv)
data->attachedProperties()->insert(id, rv);
return rv;
}
QObject *qmlAttachedPropertiesObject(int *idCache, const QObject *object,
const QMetaObject *attachedMetaObject, bool create)
{
if (*idCache == -1)
*idCache = QDeclarativeMetaType::attachedPropertiesFuncId(attachedMetaObject);
if (*idCache == -1 || !object)
return 0;
return qmlAttachedPropertiesObjectById(*idCache, object, create);
}
QDeclarativeDebuggingEnabler::QDeclarativeDebuggingEnabler()
{
#ifndef QDECLARATIVE_NO_DEBUG_PROTOCOL
if (!QDeclarativeEnginePrivate::qml_debugging_enabled) {
qWarning("Qml debugging is enabled. Only use this in a safe environment!");
}
QDeclarativeEnginePrivate::qml_debugging_enabled = true;
#endif
}
class QDeclarativeDataExtended {
public: