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Diffstat (limited to 'src/declarative/qml/qdeclarativescarceresourcescriptclass.cpp')
| -rw-r--r-- | src/declarative/qml/qdeclarativescarceresourcescriptclass.cpp | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/src/declarative/qml/qdeclarativescarceresourcescriptclass.cpp b/src/declarative/qml/qdeclarativescarceresourcescriptclass.cpp deleted file mode 100644 index d94e2d9332..0000000000 --- a/src/declarative/qml/qdeclarativescarceresourcescriptclass.cpp +++ /dev/null @@ -1,219 +0,0 @@ -/**************************************************************************** -** -** 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. -** -** $QT_BEGIN_LICENSE:LGPL$ -** 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 Technology Preview License Agreement accompanying -** this package. -** -** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. -** -** If you have questions regarding the use of this file, please contact -** Nokia at qt-info@nokia.com. -** -** -** -** -** -** -** -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "private/qdeclarativescarceresourcescriptclass_p.h" - -#include "private/qdeclarativeengine_p.h" -#include "private/qdeclarativecontext_p.h" -#include "private/qdeclarativedata_p.h" -#include "private/qdeclarativetypenamescriptclass_p.h" -#include "private/qdeclarativelistscriptclass_p.h" -#include "private/qdeclarativebinding_p.h" -#include "private/qdeclarativeguard_p.h" -#include "private/qdeclarativevmemetaobject_p.h" - -#include <QtCore/qtimer.h> -#include <QtCore/qvarlengtharray.h> -#include <QtScript/qscriptcontextinfo.h> - -Q_DECLARE_METATYPE(QScriptValue); - -QT_BEGIN_NAMESPACE - -QDeclarativeScarceResourceScriptClass::QDeclarativeScarceResourceScriptClass(QDeclarativeEngine *bindEngine) - : QScriptDeclarativeClass(QDeclarativeEnginePrivate::getScriptEngine(bindEngine)), engine(bindEngine) -{ - QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine); - - // Properties of this type can be explicitly preserved by clients, - // which prevents the scarce resource from being automatically - // released after the binding has been evaluated. - m_preserve = scriptEngine->newFunction(preserve); - m_preserveId = createPersistentIdentifier(QLatin1String("preserve")); - - // Similarly, they can be explicitly destroyed by clients, - // which releases the scarce resource. - m_destroy = scriptEngine->newFunction(destroy); - m_destroyId = createPersistentIdentifier(QLatin1String("destroy")); -} - -QDeclarativeScarceResourceScriptClass::~QDeclarativeScarceResourceScriptClass() -{ -} - -/* - Returns a JavaScript object whose instance data is a new scarce resource data. - The scarce resource is added to the doubly-linked-list of scarce resources in the engine - so that the scarce resource can be released after evaluation completes. - */ -QScriptValue QDeclarativeScarceResourceScriptClass::newScarceResource(const QVariant &v) -{ - // create the scarce resource - ScarceResourceData *srd = new ScarceResourceData(v); - - // insert into the linked list - QDeclarativeEnginePrivate *enginePrivate = QDeclarativeEnginePrivate::get(engine); - srd->insertInto(&enginePrivate->scarceResources); - Q_ASSERT(enginePrivate->scarceResourcesRefCount > 0); - - // return the javascript object with the scarce resource instance data - QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine); - return QScriptDeclarativeClass::newObject(scriptEngine, this, srd); // JSC takes ownership of srd. -} - -QVariant QDeclarativeScarceResourceScriptClass::toVariant(Object *object, bool *ok) -{ - ScarceResourceData *obj = static_cast<ScarceResourceData*>(object); - if (ok) *ok = true; - return obj->resource; -} - -QVariant QDeclarativeScarceResourceScriptClass::toVariant(const QScriptValue &value) -{ - Q_ASSERT(scriptClass(value) == this); - - return toVariant(object(value), 0); -} - -// The destroy() and preserve() function properties are readable. -QScriptClass::QueryFlags -QDeclarativeScarceResourceScriptClass::queryProperty(Object *object, const Identifier &name, - QScriptClass::QueryFlags flags) -{ - Q_UNUSED(object) - Q_UNUSED(flags) - - if (name == m_destroyId.identifier || name == m_preserveId.identifier) - return (QScriptClass::HandlesReadAccess); - return 0; -} - -// Return the (function) values which may be evaluated by clients. -QDeclarativeScarceResourceScriptClass::Value -QDeclarativeScarceResourceScriptClass::property(Object *object, const Identifier &name) -{ - Q_UNUSED(object) - - QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine); - - // functions - if (name == m_preserveId.identifier) - return Value(scriptEngine, m_preserve); - else if (name == m_destroyId.identifier) - return Value(scriptEngine, m_destroy); - - return Value(); -} - -/* - This method is called when the user explicitly calls the "preserve" method of a scarce resource in JavaScript - within the specified evaluation context \a context of the script engine \a engine. - Calling this function signifies that the user explicitly wants to preserve the resource rather than let it - be automatically released once evaluation of the expression is complete. - This function removes the internal scarce resource from the declarative engine's linked list of scarce resources - to release after evaluation of the expression completes. This means that the resource will only be truly - released when the JavaScript engine's garbage collector is run. - - Example: - \qml - function getIcon(model) { - var icon = model.avatar; // a pixmap property - icon.preserve(); // explicitly preserves the resource - return icon; // a valid variant will be returned - } - \endqml - */ -QScriptValue QDeclarativeScarceResourceScriptClass::preserve(QScriptContext *context, QScriptEngine *engine) -{ - QDeclarativeEnginePrivate *p = QDeclarativeEnginePrivate::get(engine); - QScriptValue that = context->thisObject(); - - if (scriptClass(that) != p->scarceResourceClass) - return engine->undefinedValue(); - - // The client wishes to preserve the resource in this SRD. - ScarceResourceData *data = static_cast<ScarceResourceData *>(p->scarceResourceClass->object(that)); - if (!data) - return engine->undefinedValue(); - - // remove node from list, without releasing the resource. - data->removeNode(); - - return engine->undefinedValue(); -} - -/* - This method is called when the user explicitly calls the "destroy" method of a scarce resource in JavaScript - within the specified evaluation context \a context of the script engine \a engine. - Calling this function signifies that the user explicitly wants to release the resource. - This function sets the internal scarce resource variant to the invalid variant, in order to release the original resource, - and then removes the resource from the declarative engine's linked-list of scarce resources to - to release after evaluation of the expression completes, as it has already been released. - - Example: - \qml - function getIcon(model) { - var icon = model.avatar; // a pixmap property - icon.destroy(); // explicitly releases the resource - return icon; // an invalid variant will be returned - } - \endqml - */ -QScriptValue QDeclarativeScarceResourceScriptClass::destroy(QScriptContext *context, QScriptEngine *engine) -{ - QDeclarativeEnginePrivate *p = QDeclarativeEnginePrivate::get(engine); - QScriptValue that = context->thisObject(); - - if (scriptClass(that) != p->scarceResourceClass) - return engine->undefinedValue(); - - // the client wishes to release the resource in this SRD. - ScarceResourceData *data = static_cast<ScarceResourceData *>(p->scarceResourceClass->object(that)); - if (!data) - return engine->undefinedValue(); - - // release the resource and remove the node from the list. - data->releaseResource(); - - return engine->undefinedValue(); -} - -QT_END_NAMESPACE |