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/****************************************************************************
**
** Copyright (C) 2010 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 "qdeclarativecontext.h"
#include "private/qdeclarativecontext_p.h"
#include "private/qdeclarativeexpression_p.h"
#include "private/qdeclarativeengine_p.h"
#include "qdeclarativeengine.h"
#include "private/qdeclarativecompiledbindings_p.h"
#include "qdeclarativeinfo.h"
#include "private/qdeclarativeglobalscriptclass_p.h"
#include <qscriptengine.h>
#include <QtCore/qvarlengtharray.h>
#include <QtCore/qdebug.h>
#include <private/qscriptdeclarativeclass_p.h>
QT_BEGIN_NAMESPACE
QDeclarativeContextPrivate::QDeclarativeContextPrivate()
: data(0), notifyIndex(-1)
{
}
/*!
\class QDeclarativeContext
\since 4.7
\brief The QDeclarativeContext class defines a context within a QML engine.
\mainclass
Contexts allow data to be exposed to the QML components instantiated by the
QML engine.
Each QDeclarativeContext contains a set of properties, distinct from its QObject
properties, that allow data to be explicitly bound to a context by name. The
context properties are defined and updated by calling
QDeclarativeContext::setContextProperty(). The following example shows a Qt model
being bound to a context and then accessed from a QML file.
\code
QDeclarativeEngine engine;
QDeclarativeContext *context = new QDeclarativeContext(engine.rootContext());
context->setContextProperty("myModel", modelData);
QDeclarativeComponent component(&engine, "ListView { model=myModel }");
component.create(context);
\endcode
To simplify binding and maintaining larger data sets, a context object can be set
on a QDeclarativeContext. All the properties of the context object are available
by name in the context, as though they were all individually added through calls
to QDeclarativeContext::setContextProperty(). Changes to the property's values are
detected through the property's notify signal. Setting a context object is both
faster and easier than manually adding and maintaing context property values.
The following example has the same effect as the previous one, but it uses a context
object.
\code
class MyDataSet : ... {
...
Q_PROPERTY(QAbstractItemModel *myModel READ model NOTIFY modelChanged)
...
};
MyDataSet *myDataSet = new MyDataSet;
QDeclarativeEngine engine;
QDeclarativeContext *context = new QDeclarativeContext(engine.rootContext());
context->setContextObject(myDataSet);
QDeclarativeComponent component(&engine, "ListView { model=myModel }");
component.create(context);
\endcode
All properties added explicitly by QDeclarativeContext::setContextProperty() take
precedence over context object's properties.
Contexts form a hierarchy. The root of this heirarchy is the QDeclarativeEngine's
\l {QDeclarativeEngine::rootContext()}{root context}. A component instance can
access the data in its own context, as well as all its ancestor contexts. Data
can be made available to all instances by modifying the
\l {QDeclarativeEngine::rootContext()}{root context}.
The following example defines two contexts - \c context1 and \c context2. The
second context overrides the "b" context property inherited from the first with a
new value.
\code
QDeclarativeEngine engine;
QDeclarativeContext *context1 = new QDeclarativeContext(engine.rootContext());
QDeclarativeContext *context2 = new QDeclarativeContext(context1);
context1->setContextProperty("a", 12);
context1->setContextProperty("b", 12);
context2->setContextProperty("b", 15);
\endcode
While QML objects instantiated in a context are not strictly owned by that
context, their bindings are. If a context is destroyed, the property bindings of
outstanding QML objects will stop evaluating.
*/
/*! \internal */
QDeclarativeContext::QDeclarativeContext(QDeclarativeEngine *e, bool)
: QObject(*(new QDeclarativeContextPrivate))
{
Q_D(QDeclarativeContext);
d->data = new QDeclarativeContextData(this);
d->data->engine = e;
}
/*!
Create a new QDeclarativeContext as a child of \a engine's root context, and the
QObject \a parent.
*/
QDeclarativeContext::QDeclarativeContext(QDeclarativeEngine *engine, QObject *parent)
: QObject(*(new QDeclarativeContextPrivate), parent)
{
Q_D(QDeclarativeContext);
d->data = new QDeclarativeContextData(this);
d->data->setParent(engine?QDeclarativeContextData::get(engine->rootContext()):0);
}
/*!
Create a new QDeclarativeContext with the given \a parentContext, and the
QObject \a parent.
*/
QDeclarativeContext::QDeclarativeContext(QDeclarativeContext *parentContext, QObject *parent)
: QObject(*(new QDeclarativeContextPrivate), parent)
{
Q_D(QDeclarativeContext);
d->data = new QDeclarativeContextData(this);
d->data->setParent(parentContext?QDeclarativeContextData::get(parentContext):0);
}
/*!
\internal
*/
QDeclarativeContext::QDeclarativeContext(QDeclarativeContextData *data)
: QObject(*(new QDeclarativeContextPrivate), 0)
{
Q_D(QDeclarativeContext);
d->data = data;
}
/*!
Destroys the QDeclarativeContext.
Any expressions, or sub-contexts dependent on this context will be
invalidated, but not destroyed (unless they are parented to the QDeclarativeContext
object).
*/
QDeclarativeContext::~QDeclarativeContext()
{
Q_D(QDeclarativeContext);
if (!d->data->isInternal)
d->data->destroy();
}
bool QDeclarativeContext::isValid() const
{
Q_D(const QDeclarativeContext);
return d->data && d->data->isValid();
}
/*!
Return the context's QDeclarativeEngine, or 0 if the context has no QDeclarativeEngine or the
QDeclarativeEngine was destroyed.
*/
QDeclarativeEngine *QDeclarativeContext::engine() const
{
Q_D(const QDeclarativeContext);
return d->data->engine;
}
/*!
Return the context's parent QDeclarativeContext, or 0 if this context has no
parent or if the parent has been destroyed.
*/
QDeclarativeContext *QDeclarativeContext::parentContext() const
{
Q_D(const QDeclarativeContext);
return d->data->parent?d->data->parent->asQDeclarativeContext():0;
}
/*!
Return the context object, or 0 if there is no context object.
*/
QObject *QDeclarativeContext::contextObject() const
{
Q_D(const QDeclarativeContext);
return d->data->contextObject;
}
/*!
Set the context \a object.
*/
void QDeclarativeContext::setContextObject(QObject *object)
{
Q_D(QDeclarativeContext);
QDeclarativeContextData *data = d->data;
if (data->isInternal) {
qWarning("QDeclarativeContext: Cannot set context object for internal context.");
return;
}
if (!isValid()) {
qWarning("QDeclarativeContext: Cannot set context object on invalid context.");
return;
}
data->contextObject = object;
}
/*!
Set a the \a value of the \a name property on this context.
*/
void QDeclarativeContext::setContextProperty(const QString &name, const QVariant &value)
{
Q_D(QDeclarativeContext);
if (d->notifyIndex == -1)
d->notifyIndex = this->metaObject()->methodCount();
QDeclarativeContextData *data = d->data;
if (data->isInternal) {
qWarning("QDeclarativeContext: Cannot set property on internal context.");
return;
}
if (!isValid()) {
qWarning("QDeclarativeContext: Cannot set property on invalid context.");
return;
}
if (data->engine) {
bool ok;
QObject *o = QDeclarativeEnginePrivate::get(data->engine)->toQObject(value, &ok);
if (ok) {
setContextProperty(name, o);
return;
}
}
if (!data->propertyNames) data->propertyNames = new QDeclarativeIntegerCache(data->engine);
int idx = data->propertyNames->value(name);
if (idx == -1) {
data->propertyNames->add(name, data->idValueCount + d->propertyValues.count());
d->propertyValues.append(value);
data->refreshExpressions();
} else {
d->propertyValues[idx] = value;
QMetaObject::activate(this, idx + d->notifyIndex, 0);
}
}
/*!
Set the \a value of the \a name property on this context.
QDeclarativeContext does \bold not take ownership of \a value.
*/
void QDeclarativeContext::setContextProperty(const QString &name, QObject *value)
{
Q_D(QDeclarativeContext);
if (d->notifyIndex == -1)
d->notifyIndex = this->metaObject()->methodCount();
QDeclarativeContextData *data = d->data;
if (data->isInternal) {
qWarning("QDeclarativeContext: Cannot set property on internal context.");
return;
}
if (!isValid()) {
qWarning("QDeclarativeContext: Cannot set property on invalid context.");
return;
}
if (!data->propertyNames) data->propertyNames = new QDeclarativeIntegerCache(data->engine);
int idx = data->propertyNames->value(name);
if (idx == -1) {
data->propertyNames->add(name, data->idValueCount + d->propertyValues.count());
d->propertyValues.append(QVariant::fromValue(value));
data->refreshExpressions();
} else {
d->propertyValues[idx] = QVariant::fromValue(value);
QMetaObject::activate(this, idx + d->notifyIndex, 0);
}
}
/*!
Returns the value of the \a name property for this context
as a QVariant.
*/
QVariant QDeclarativeContext::contextProperty(const QString &name) const
{
Q_D(const QDeclarativeContext);
QVariant value;
int idx = -1;
QDeclarativeContextData *data = d->data;
if (data->propertyNames)
idx = data->propertyNames->value(name);
if (idx == -1) {
QByteArray utf8Name = name.toUtf8();
if (data->contextObject) {
QObject *obj = data->contextObject;
QDeclarativePropertyCache::Data local;
QDeclarativePropertyCache::Data *property =
QDeclarativePropertyCache::property(data->engine, obj, name, local);
if (property) value = obj->metaObject()->property(property->coreIndex).read(obj);
}
if (!value.isValid() && parentContext())
value = parentContext()->contextProperty(name);
} else {
if (idx >= d->propertyValues.count())
value = QVariant::fromValue(data->idValues[idx - d->propertyValues.count()].data());
else
value = d->propertyValues[idx];
}
return value;
}
/*!
Resolves the URL \a src relative to the URL of the
containing component.
\sa QDeclarativeEngine::baseUrl(), setBaseUrl()
*/
QUrl QDeclarativeContext::resolvedUrl(const QUrl &src)
{
Q_D(QDeclarativeContext);
return d->data->resolvedUrl(src);
}
QUrl QDeclarativeContextData::resolvedUrl(const QUrl &src)
{
QDeclarativeContextData *ctxt = this;
if (src.isRelative() && !src.isEmpty()) {
if (ctxt) {
while(ctxt) {
if(ctxt->url.isValid())
break;
else
ctxt = ctxt->parent;
}
if (ctxt)
return ctxt->url.resolved(src);
else if (engine)
return engine->baseUrl().resolved(src);
}
return QUrl();
} else {
return src;
}
}
/*!
Explicitly sets the url resolvedUrl() will use for relative references to \a baseUrl.
Calling this function will override the url of the containing
component used by default.
\sa resolvedUrl()
*/
void QDeclarativeContext::setBaseUrl(const QUrl &baseUrl)
{
Q_D(QDeclarativeContext);
d->data->url = baseUrl;
}
/*!
Returns the base url of the component, or the containing component
if none is set.
*/
QUrl QDeclarativeContext::baseUrl() const
{
Q_D(const QDeclarativeContext);
const QDeclarativeContextData* data = d->data;
while (data && data->url.isEmpty())
data = data->parent;
if (data)
return data->url;
else
return QUrl();
}
int QDeclarativeContextPrivate::context_count(QDeclarativeListProperty<QObject> *prop)
{
QDeclarativeContext *context = static_cast<QDeclarativeContext*>(prop->object);
QDeclarativeContextPrivate *d = QDeclarativeContextPrivate::get(context);
int contextProperty = (int)(intptr_t)prop->data;
if (d->propertyValues.at(contextProperty).userType() != qMetaTypeId<QList<QObject*> >()) {
return 0;
} else {
return ((const QList<QObject> *)d->propertyValues.at(contextProperty).constData())->count();
}
}
QObject *QDeclarativeContextPrivate::context_at(QDeclarativeListProperty<QObject> *prop, int index)
{
QDeclarativeContext *context = static_cast<QDeclarativeContext*>(prop->object);
QDeclarativeContextPrivate *d = QDeclarativeContextPrivate::get(context);
int contextProperty = (int)(intptr_t)prop->data;
if (d->propertyValues.at(contextProperty).userType() != qMetaTypeId<QList<QObject*> >()) {
return 0;
} else {
return ((const QList<QObject*> *)d->propertyValues.at(contextProperty).constData())->at(index);
}
}
QDeclarativeContextData::QDeclarativeContextData()
: parent(0), engine(0), isInternal(false), publicContext(0), propertyNames(0), contextObject(0),
imports(0), childContexts(0), nextChild(0), prevChild(0), expressions(0), contextObjects(0),
contextGuards(0), idValues(0), idValueCount(0), optimizedBindings(0), linkedContext(0)
{
}
QDeclarativeContextData::QDeclarativeContextData(QDeclarativeContext *ctxt)
: parent(0), engine(0), isInternal(false), publicContext(ctxt), propertyNames(0), contextObject(0),
imports(0), childContexts(0), nextChild(0), prevChild(0), expressions(0), contextObjects(0),
contextGuards(0), idValues(0), idValueCount(0), optimizedBindings(0), linkedContext(0)
{
}
void QDeclarativeContextData::destroy()
{
if (linkedContext)
linkedContext->destroy();
if (prevChild) {
*prevChild = nextChild;
if (nextChild) nextChild->prevChild = prevChild;
nextChild = 0;
prevChild = 0;
}
QDeclarativeContextData *child = childContexts;
while (child) {
QDeclarativeContextData *next = child->nextChild;
child->invalidateEngines();
child->parent = 0;
child->nextChild = 0;
child->prevChild = 0;
child = next;
}
childContexts = 0;
QDeclarativeAbstractExpression *expression = expressions;
while (expression) {
QDeclarativeAbstractExpression *nextExpression = expression->m_nextExpression;
expression->m_context = 0;
expression->m_prevExpression = 0;
expression->m_nextExpression = 0;
expression = nextExpression;
}
expressions = 0;
while (contextObjects) {
QDeclarativeData *co = contextObjects;
contextObjects = contextObjects->nextContextObject;
co->context = 0;
co->outerContext = 0;
co->nextContextObject = 0;
co->prevContextObject = 0;
}
QDeclarativeGuardedContextData *contextGuard = contextGuards;
while (contextGuard) {
QDeclarativeGuardedContextData *next = contextGuard->m_next;
contextGuard->m_next = 0;
contextGuard->m_prev = 0;
contextGuard->m_contextData = 0;
contextGuard = next;
}
contextGuards = 0;
if (propertyNames)
propertyNames->release();
if (imports)
imports->release();
if (optimizedBindings)
optimizedBindings->release();
delete [] idValues;
if (isInternal)
delete publicContext;
delete this;
}
void QDeclarativeContextData::setParent(QDeclarativeContextData *p)
{
if (p) {
parent = p;
engine = p->engine;
nextChild = p->childContexts;
if (nextChild) nextChild->prevChild = &nextChild;
prevChild = &p->childContexts;
p->childContexts = this;
}
}
void QDeclarativeContextData::invalidateEngines()
{
if (!engine)
return;
engine = 0;
QDeclarativeContextData *child = childContexts;
while (child) {
child->invalidateEngines();
child = child->nextChild;
}
}
/*
Refreshes all expressions that could possibly depend on this context. Refreshing flushes all
context-tree dependent caches in the expressions, and should occur every time the context tree
*structure* (not values) changes.
*/
void QDeclarativeContextData::refreshExpressions()
{
QDeclarativeContextData *child = childContexts;
while (child) {
child->refreshExpressions();
child = child->nextChild;
}
QDeclarativeAbstractExpression *expression = expressions;
while (expression) {
expression->refresh();
expression = expression->m_nextExpression;
}
}
void QDeclarativeContextData::addObject(QObject *o)
{
QDeclarativeData *data = QDeclarativeData::get(o, true);
Q_ASSERT(data->context == 0);
data->context = this;
data->outerContext = this;
data->nextContextObject = contextObjects;
if (data->nextContextObject)
data->nextContextObject->prevContextObject = &data->nextContextObject;
data->prevContextObject = &contextObjects;
contextObjects = data;
}
void QDeclarativeContextData::addImportedScript(const QDeclarativeParser::Object::ScriptBlock &script)
{
if (!engine)
return;
Q_ASSERT(script.codes.count() == 1);
QDeclarativeEnginePrivate *enginePriv = QDeclarativeEnginePrivate::get(engine);
QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);
const QString &code = script.codes.at(0);
const QString &url = script.files.at(0);
const QDeclarativeParser::Object::ScriptBlock::Pragmas &pragmas = script.pragmas.at(0);
Q_ASSERT(!url.isEmpty());
if (pragmas & QDeclarativeParser::Object::ScriptBlock::Shared) {
QHash<QString, QScriptValue>::Iterator iter = enginePriv->m_sharedScriptImports.find(url);
if (iter == enginePriv->m_sharedScriptImports.end()) {
QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
scriptContext->pushScope(enginePriv->contextClass->newContext(0, 0));
scriptContext->pushScope(enginePriv->globalClass->globalObject());
QScriptValue scope = scriptEngine->newObject();
scriptContext->setActivationObject(scope);
scriptContext->pushScope(scope);
scriptEngine->evaluate(code, url, 1);
if (scriptEngine->hasUncaughtException()) {
QDeclarativeError error;
QDeclarativeExpressionPrivate::exceptionToError(scriptEngine, error);
qWarning().nospace() << qPrintable(error.toString());
}
scriptEngine->popContext();
iter = enginePriv->m_sharedScriptImports.insert(url, scope);
}
importedScripts.append(*iter);
} else {
QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
scriptContext->pushScope(enginePriv->contextClass->newContext(this, 0));
scriptContext->pushScope(enginePriv->globalClass->globalObject());
QScriptValue scope = scriptEngine->newObject();
scriptContext->setActivationObject(scope);
scriptContext->pushScope(scope);
scriptEngine->evaluate(code, url, 1);
if (scriptEngine->hasUncaughtException()) {
QDeclarativeError error;
QDeclarativeExpressionPrivate::exceptionToError(scriptEngine, error);
qWarning().nospace() << qPrintable(error.toString());
}
scriptEngine->popContext();
importedScripts.append(scope);
}
}
void QDeclarativeContextData::addScript(const QDeclarativeParser::Object::ScriptBlock &script,
QObject *scopeObject)
{
if (!engine)
return;
QDeclarativeEnginePrivate *enginePriv = QDeclarativeEnginePrivate::get(engine);
QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);
QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
scriptContext->pushScope(enginePriv->contextClass->newContext(this, scopeObject));
scriptContext->pushScope(enginePriv->globalClass->globalObject());
QScriptValue scope = scriptEngine->newObject();
scriptContext->setActivationObject(scope);
scriptContext->pushScope(scope);
for (int ii = 0; ii < script.codes.count(); ++ii) {
scriptEngine->evaluate(script.codes.at(ii), script.files.at(ii), script.lineNumbers.at(ii));
if (scriptEngine->hasUncaughtException()) {
QDeclarativeError error;
QDeclarativeExpressionPrivate::exceptionToError(scriptEngine, error);
qWarning().nospace() << qPrintable(error.toString());
}
}
scriptEngine->popContext();
scripts.append(scope);
}
void QDeclarativeContextData::setIdProperty(int idx, QObject *obj)
{
idValues[idx] = obj;
idValues[idx].context = this;
}
void QDeclarativeContextData::setIdPropertyData(QDeclarativeIntegerCache *data)
{
Q_ASSERT(!propertyNames);
propertyNames = data;
propertyNames->addref();
idValueCount = data->count();
idValues = new ContextGuard[idValueCount];
}
QString QDeclarativeContextData::findObjectId(const QObject *obj) const
{
if (!idValues || !propertyNames)
return QString();
for (int i=0; i<idValueCount; i++) {
if (idValues[i] == obj)
return propertyNames->findId(i);
}
if (linkedContext)
return linkedContext->findObjectId(obj);
return QString();
}
QDeclarativeContext *QDeclarativeContextData::asQDeclarativeContext()
{
if (!publicContext)
publicContext = new QDeclarativeContext(this);
return publicContext;
}
QDeclarativeContextPrivate *QDeclarativeContextData::asQDeclarativeContextPrivate()
{
return QDeclarativeContextPrivate::get(asQDeclarativeContext());
}
QT_END_NAMESPACE
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