/
qqmlcomponent.cpp
1351 lines (1115 loc) · 42.5 KB
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qqmlcomponent.cpp
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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml 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 "qqmlcomponent.h"
#include "qqmlcomponent_p.h"
#include "qqmlcomponentattached_p.h"
#include "qqmlcompiler_p.h"
#include "qqmlcontext_p.h"
#include "qqmlengine_p.h"
#include "qqmlvme_p.h"
#include "qqml.h"
#include "qqmlengine.h"
#include "qqmlbinding_p.h"
#include "qqmlglobal_p.h"
#include "qqmlscript_p.h"
#include <private/qqmlprofilerservice_p.h>
#include <private/qqmlenginedebugservice_p.h>
#include "qqmlincubator.h"
#include "qqmlincubator_p.h"
#include <private/qqmljavascriptexpression_p.h>
#include <private/qv8engine_p.h>
#include <private/qv8include_p.h>
#include <QStack>
#include <QStringList>
#include <QtCore/qdebug.h>
#include <qqmlinfo.h>
QT_BEGIN_NAMESPACE
class QQmlComponentExtension : public QV8Engine::Deletable
{
public:
QQmlComponentExtension(QV8Engine *);
virtual ~QQmlComponentExtension();
v8::Persistent<v8::Function> incubationConstructor;
v8::Persistent<v8::Script> initialProperties;
v8::Persistent<v8::Function> forceCompletion;
};
V8_DEFINE_EXTENSION(QQmlComponentExtension, componentExtension);
/*
Try to do what's necessary for a reasonable display of the type
name, but no more (just enough for the client to do more extensive cleanup).
Should only be called when debugging is enabled.
*/
static inline QString buildTypeNameForDebug(const QMetaObject *metaObject)
{
static const QString qmlMarker(QLatin1String("_QML"));
static const QChar underscore(QLatin1Char('_'));
static const QChar asterisk(QLatin1Char('*'));
QQmlType *type = QQmlMetaType::qmlType(metaObject);
QString typeName = type ? type->qmlTypeName() : QString::fromUtf8(metaObject->className());
if (!type) {
//### optimize further?
int marker = typeName.indexOf(qmlMarker);
if (marker != -1 && marker < typeName.count() - 1) {
if (typeName[marker + 1] == underscore) {
const QString className = typeName.left(marker) + asterisk;
type = QQmlMetaType::qmlType(QMetaType::type(className.toUtf8()));
if (type)
typeName = type->qmlTypeName();
}
}
}
return typeName;
}
/*!
\class QQmlComponent
\since 4.7
\brief The QQmlComponent class encapsulates a QML component definition.
\mainclass
Components are reusable, encapsulated QML elements with well-defined interfaces.
They are often defined in \l {qdeclarativedocuments.html}{Component Files}.
A QQmlComponent instance can be created from a QML file.
For example, if there is a \c main.qml file like this:
\qml
import QtQuick 2.0
Item {
width: 200
height: 200
}
\endqml
The following code loads this QML file as a component, creates an instance of
this component using create(), and then queries the \l Item's \l {Item::}{width}
value:
\code
QQmlEngine *engine = new QQmlEngine;
QQmlComponent component(engine, QUrl::fromLocalFile("main.qml"));
QObject *myObject = component.create();
QQuickItem *item = qobject_cast<QQuickItem*>(myObject);
int width = item->width(); // width = 200
\endcode
\section2 Network Components
If the URL passed to QQmlComponent is a network resource, or if the QML document references a
network resource, the QQmlComponent has to fetch the network data before it is able to create
objects. In this case, the QQmlComponent will have a \l {QQmlComponent::Loading}{Loading}
\l {QQmlComponent::status()}{status}. An application will have to wait until the component
is \l {QQmlComponent::Ready}{Ready} before calling \l {QQmlComponent::create()}.
The following example shows how to load a QML file from a network resource. After creating
the QQmlComponent, it tests whether the component is loading. If it is, it connects to the
QQmlComponent::statusChanged() signal and otherwise calls the \c {continueLoading()} method
directly. Note that QQmlComponent::isLoading() may be false for a network component if the
component has been cached and is ready immediately.
\code
MyApplication::MyApplication()
{
// ...
component = new QQmlComponent(engine, QUrl("http://www.example.com/main.qml"));
if (component->isLoading())
QObject::connect(component, SIGNAL(statusChanged(QQmlComponent::Status)),
this, SLOT(continueLoading()));
else
continueLoading();
}
void MyApplication::continueLoading()
{
if (component->isError()) {
qWarning() << component->errors();
} else {
QObject *myObject = component->create();
}
}
\endcode
\sa {Using QML Bindings in C++ Applications}, {Integrating QML Code with Existing Qt UI Code}
*/
/*!
\qmlclass Component QQmlComponent
\ingroup qml-utility-elements
\since 4.7
\brief The Component element encapsulates a QML component definition.
Components are reusable, encapsulated QML elements with well-defined interfaces.
Components are often defined by \l {qdeclarativedocuments.html}{component files} -
that is, \c .qml files. The \e Component element essentially allows QML components
to be defined inline, within a \l {QML Document}{QML document}, rather than as a separate QML file.
This may be useful for reusing a small component within a QML file, or for defining
a component that logically belongs with other QML components within a file.
For example, here is a component that is used by multiple \l Loader objects.
It contains a single item, a \l Rectangle:
\snippet doc/src/snippets/qml/component.qml 0
Notice that while a \l Rectangle by itself would be automatically
rendered and displayed, this is not the case for the above rectangle
because it is defined inside a \c Component. The component encapsulates the
QML elements within, as if they were defined in a separate QML
file, and is not loaded until requested (in this case, by the
two \l Loader objects).
Defining a \c Component is similar to defining a \l {QML Document}{QML document}.
A QML document has a single top-level item that defines the behaviors and
properties of that component, and cannot define properties or behaviors outside
of that top-level item. In the same way, a \c Component definition contains a single
top level item (which in the above example is a \l Rectangle) and cannot define any
data outside of this item, with the exception of an \e id (which in the above example
is \e redSquare).
The \c Component element is commonly used to provide graphical components
for views. For example, the ListView::delegate property requires a \c Component
to specify how each list item is to be displayed.
\c Component objects can also be created dynamically using
\l{QML:Qt::createComponent()}{Qt.createComponent()}.
*/
/*!
\qmlattachedsignal Component::onCompleted()
Emitted after component "startup" has completed. This can be used to
execute script code at startup, once the full QML environment has been
established.
The \c {Component::onCompleted} attached property can be applied to
any element. The order of running the \c onCompleted scripts is
undefined.
\qml
Rectangle {
Component.onCompleted: console.log("Completed Running!")
Rectangle {
Component.onCompleted: console.log("Nested Completed Running!")
}
}
\endqml
*/
/*!
\qmlattachedsignal Component::onDestruction()
Emitted as the component begins destruction. This can be used to undo
work done in the onCompleted signal, or other imperative code in your
application.
The \c {Component::onDestruction} attached property can be applied to
any element. However, it applies to the destruction of the component as
a whole, and not the destruction of the specific object. The order of
running the \c onDestruction scripts is undefined.
\qml
Rectangle {
Component.onDestruction: console.log("Destruction Beginning!")
Rectangle {
Component.onDestruction: console.log("Nested Destruction Beginning!")
}
}
\endqml
\sa QtQml
*/
/*!
\enum QQmlComponent::Status
Specifies the loading status of the QQmlComponent.
\value Null This QQmlComponent has no data. Call loadUrl() or setData() to add QML content.
\value Ready This QQmlComponent is ready and create() may be called.
\value Loading This QQmlComponent is loading network data.
\value Error An error has occurred. Call errors() to retrieve a list of \{QQmlError}{errors}.
*/
void QQmlComponentPrivate::typeDataReady(QQmlTypeData *)
{
Q_Q(QQmlComponent);
Q_ASSERT(typeData);
fromTypeData(typeData);
typeData = 0;
emit q->statusChanged(q->status());
}
void QQmlComponentPrivate::typeDataProgress(QQmlTypeData *, qreal p)
{
Q_Q(QQmlComponent);
progress = p;
emit q->progressChanged(p);
}
void QQmlComponentPrivate::fromTypeData(QQmlTypeData *data)
{
url = data->finalUrl();
QQmlCompiledData *c = data->compiledData();
if (!c) {
Q_ASSERT(data->isError());
state.errors = data->errors();
} else {
cc = c;
}
data->release();
}
void QQmlComponentPrivate::clear()
{
if (typeData) {
typeData->unregisterCallback(this);
typeData->release();
typeData = 0;
}
if (cc) {
cc->release();
cc = 0;
}
}
/*!
\internal
*/
QQmlComponent::QQmlComponent(QObject *parent)
: QObject(*(new QQmlComponentPrivate), parent)
{
}
/*!
Destruct the QQmlComponent.
*/
QQmlComponent::~QQmlComponent()
{
Q_D(QQmlComponent);
if (d->state.completePending) {
qWarning("QQmlComponent: Component destroyed while completion pending");
d->completeCreate();
}
if (d->typeData) {
d->typeData->unregisterCallback(d);
d->typeData->release();
}
if (d->cc)
d->cc->release();
}
/*!
\qmlproperty enumeration Component::status
This property holds the status of component loading. It can be one of:
\list
\li Component.Null - no data is available for the component
\li Component.Ready - the component has been loaded, and can be used to create instances.
\li Component.Loading - the component is currently being loaded
\li Component.Error - an error occurred while loading the component.
Calling errorString() will provide a human-readable description of any errors.
\endlist
*/
/*!
\property QQmlComponent::status
The component's current \l{QQmlComponent::Status} {status}.
*/
QQmlComponent::Status QQmlComponent::status() const
{
Q_D(const QQmlComponent);
if (d->typeData)
return Loading;
else if (!d->state.errors.isEmpty())
return Error;
else if (d->engine && d->cc)
return Ready;
else
return Null;
}
/*!
Returns true if status() == QQmlComponent::Null.
*/
bool QQmlComponent::isNull() const
{
return status() == Null;
}
/*!
Returns true if status() == QQmlComponent::Ready.
*/
bool QQmlComponent::isReady() const
{
return status() == Ready;
}
/*!
Returns true if status() == QQmlComponent::Error.
*/
bool QQmlComponent::isError() const
{
return status() == Error;
}
/*!
Returns true if status() == QQmlComponent::Loading.
*/
bool QQmlComponent::isLoading() const
{
return status() == Loading;
}
/*!
\qmlproperty real Component::progress
The progress of loading the component, from 0.0 (nothing loaded)
to 1.0 (finished).
*/
/*!
\property QQmlComponent::progress
The progress of loading the component, from 0.0 (nothing loaded)
to 1.0 (finished).
*/
qreal QQmlComponent::progress() const
{
Q_D(const QQmlComponent);
return d->progress;
}
/*!
\fn void QQmlComponent::progressChanged(qreal progress)
Emitted whenever the component's loading progress changes. \a progress will be the
current progress between 0.0 (nothing loaded) and 1.0 (finished).
*/
/*!
\fn void QQmlComponent::statusChanged(QQmlComponent::Status status)
Emitted whenever the component's status changes. \a status will be the
new status.
*/
/*!
Create a QQmlComponent with no data and give it the specified
\a engine and \a parent. Set the data with setData().
*/
QQmlComponent::QQmlComponent(QQmlEngine *engine, QObject *parent)
: QObject(*(new QQmlComponentPrivate), parent)
{
Q_D(QQmlComponent);
d->engine = engine;
}
/*!
Create a QQmlComponent from the given \a url and give it the
specified \a parent and \a engine.
Ensure that the URL provided is full and correct, in particular, use
\l QUrl::fromLocalFile() when loading a file from the local filesystem.
\sa loadUrl()
*/
QQmlComponent::QQmlComponent(QQmlEngine *engine, const QUrl &url, QObject *parent)
: QObject(*(new QQmlComponentPrivate), parent)
{
Q_D(QQmlComponent);
d->engine = engine;
loadUrl(url);
}
/*!
Create a QQmlComponent from the given \a fileName and give it the specified
\a parent and \a engine.
\sa loadUrl()
*/
QQmlComponent::QQmlComponent(QQmlEngine *engine, const QString &fileName,
QObject *parent)
: QObject(*(new QQmlComponentPrivate), parent)
{
Q_D(QQmlComponent);
d->engine = engine;
loadUrl(d->engine->baseUrl().resolved(QUrl::fromLocalFile(fileName)));
}
/*!
\internal
*/
QQmlComponent::QQmlComponent(QQmlEngine *engine, QQmlCompiledData *cc, int start, QObject *parent)
: QObject(*(new QQmlComponentPrivate), parent)
{
Q_D(QQmlComponent);
d->engine = engine;
d->cc = cc;
cc->addref();
d->start = start;
d->url = cc->url;
d->progress = 1.0;
}
/*!
Sets the QQmlComponent to use the given QML \a data. If \a url
is provided, it is used to set the component name and to provide
a base path for items resolved by this component.
*/
void QQmlComponent::setData(const QByteArray &data, const QUrl &url)
{
Q_D(QQmlComponent);
d->clear();
d->url = url;
QQmlTypeData *typeData = QQmlEnginePrivate::get(d->engine)->typeLoader.get(data, url);
if (typeData->isCompleteOrError()) {
d->fromTypeData(typeData);
} else {
d->typeData = typeData;
d->typeData->registerCallback(d);
}
d->progress = 1.0;
emit statusChanged(status());
emit progressChanged(d->progress);
}
/*!
Returns the QQmlContext the component was created in. This is only
valid for components created directly from QML.
*/
QQmlContext *QQmlComponent::creationContext() const
{
Q_D(const QQmlComponent);
if(d->creationContext)
return d->creationContext->asQQmlContext();
return qmlContext(this);
}
/*!
Load the QQmlComponent from the provided \a url.
Ensure that the URL provided is full and correct, in particular, use
\l QUrl::fromLocalFile() when loading a file from the local filesystem.
*/
void QQmlComponent::loadUrl(const QUrl &url)
{
Q_D(QQmlComponent);
d->clear();
if ((url.isRelative() && !url.isEmpty())
|| url.scheme() == QLatin1String("file")) // Workaround QTBUG-11929
d->url = d->engine->baseUrl().resolved(url);
else
d->url = url;
if (url.isEmpty()) {
QQmlError error;
error.setDescription(tr("Invalid empty URL"));
d->state.errors << error;
return;
}
QQmlTypeData *data = QQmlEnginePrivate::get(d->engine)->typeLoader.get(d->url);
if (data->isCompleteOrError()) {
d->fromTypeData(data);
d->progress = 1.0;
} else {
d->typeData = data;
d->typeData->registerCallback(d);
d->progress = data->progress();
}
emit statusChanged(status());
emit progressChanged(d->progress);
}
/*!
Return the list of errors that occurred during the last compile or create
operation. An empty list is returned if isError() is not set.
*/
QList<QQmlError> QQmlComponent::errors() const
{
Q_D(const QQmlComponent);
if (isError())
return d->state.errors;
else
return QList<QQmlError>();
}
/*!
\qmlmethod string Component::errorString()
Returns a human-readable description of any errors.
The string includes the file, location, and description of each error.
If multiple errors are present they are separated by a newline character.
If no errors are present, an empty string is returned.
*/
/*!
\internal
errorString is only meant as a way to get the errors in script
*/
QString QQmlComponent::errorString() const
{
Q_D(const QQmlComponent);
QString ret;
if(!isError())
return ret;
foreach(const QQmlError &e, d->state.errors) {
ret += e.url().toString() + QLatin1Char(':') +
QString::number(e.line()) + QLatin1Char(' ') +
e.description() + QLatin1Char('\n');
}
return ret;
}
/*!
\qmlproperty url Component::url
The component URL. This is the URL that was used to construct the component.
*/
/*!
\property QQmlComponent::url
The component URL. This is the URL passed to either the constructor,
or the loadUrl() or setData() methods.
*/
QUrl QQmlComponent::url() const
{
Q_D(const QQmlComponent);
return d->url;
}
/*!
\internal
*/
QQmlComponent::QQmlComponent(QQmlComponentPrivate &dd, QObject *parent)
: QObject(dd, parent)
{
}
/*!
Create an object instance from this component. Returns 0 if creation
failed. \a context specifies the context within which to create the object
instance.
If \a context is 0 (the default), it will create the instance in the
engine' s \l {QQmlEngine::rootContext()}{root context}.
*/
QObject *QQmlComponent::create(QQmlContext *context)
{
Q_D(QQmlComponent);
if (!context)
context = d->engine->rootContext();
QObject *rv = beginCreate(context);
completeCreate();
return rv;
}
/*!
This method provides more advanced control over component instance creation.
In general, programmers should use QQmlComponent::create() to create a
component.
Create an object instance from this component. Returns 0 if creation
failed. \a publicContext specifies the context within which to create the object
instance.
When QQmlComponent constructs an instance, it occurs in three steps:
\list 1
\li The object hierarchy is created, and constant values are assigned.
\li Property bindings are evaluated for the the first time.
\li If applicable, QQmlParserStatus::componentComplete() is called on objects.
\endlist
QQmlComponent::beginCreate() differs from QQmlComponent::create() in that it
only performs step 1. QQmlComponent::completeCreate() must be called to
complete steps 2 and 3.
This breaking point is sometimes useful when using attached properties to
communicate information to an instantiated component, as it allows their
initial values to be configured before property bindings take effect.
*/
QObject *QQmlComponent::beginCreate(QQmlContext *publicContext)
{
Q_D(QQmlComponent);
Q_ASSERT(publicContext);
QQmlContextData *context = QQmlContextData::get(publicContext);
return d->beginCreate(context);
}
QObject *
QQmlComponentPrivate::beginCreate(QQmlContextData *context)
{
Q_Q(QQmlComponent);
if (!context) {
qWarning("QQmlComponent: Cannot create a component in a null context");
return 0;
}
if (!context->isValid()) {
qWarning("QQmlComponent: Cannot create a component in an invalid context");
return 0;
}
if (context->engine != engine) {
qWarning("QQmlComponent: Must create component in context from the same QQmlEngine");
return 0;
}
if (state.completePending) {
qWarning("QQmlComponent: Cannot create new component instance before completing the previous");
return 0;
}
if (!q->isReady()) {
qWarning("QQmlComponent: Component is not ready");
return 0;
}
QQmlEnginePrivate *enginePriv = QQmlEnginePrivate::get(engine);
if (enginePriv->inProgressCreations == 0) {
// only track root, since further ones might not be properly nested
profiler = new QQmlObjectCreatingProfiler();
}
enginePriv->inProgressCreations++;
state.errors.clear();
state.completePending = true;
enginePriv->referenceScarceResources();
state.vme.init(context, cc, start, creationContext);
QObject *rv = state.vme.execute(&state.errors);
enginePriv->dereferenceScarceResources();
if (rv) {
QQmlData *ddata = QQmlData::get(rv);
Q_ASSERT(ddata);
ddata->indestructible = true;
}
if (enginePriv->isDebugging && rv) {
if (!context->isInternal)
context->asQQmlContextPrivate()->instances.append(rv);
QQmlEngineDebugService::instance()->objectCreated(engine, rv);
if (profiler && profiler->enabled) {
profiler->setTypeName(buildTypeNameForDebug(rv->metaObject()));
QQmlData *data = QQmlData::get(rv);
Q_ASSERT(data);
profiler->setLocation(cc->url, data->lineNumber, data->columnNumber);
}
}
return rv;
}
void QQmlComponentPrivate::beginDeferred(QQmlEnginePrivate *enginePriv,
QObject *object, ConstructionState *state)
{
enginePriv->inProgressCreations++;
state->errors.clear();
state->completePending = true;
state->vme.initDeferred(object);
state->vme.execute(&state->errors);
}
void QQmlComponentPrivate::complete(QQmlEnginePrivate *enginePriv, ConstructionState *state)
{
if (state->completePending) {
state->vme.complete();
state->completePending = false;
enginePriv->inProgressCreations--;
if (0 == enginePriv->inProgressCreations) {
while (enginePriv->erroredBindings) {
enginePriv->warning(enginePriv->erroredBindings->error);
enginePriv->erroredBindings->removeError();
}
}
}
}
/*!
This method provides more advanced control over component instance creation.
In general, programmers should use QQmlComponent::create() to create a
component.
Complete a component creation begin with QQmlComponent::beginCreate().
*/
void QQmlComponent::completeCreate()
{
Q_D(QQmlComponent);
d->completeCreate();
}
void QQmlComponentPrivate::completeCreate()
{
if (state.completePending) {
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(engine);
complete(ep, &state);
delete profiler;
profiler = 0;
}
}
QQmlComponentAttached::QQmlComponentAttached(QObject *parent)
: QObject(parent), prev(0), next(0)
{
}
QQmlComponentAttached::~QQmlComponentAttached()
{
if (prev) *prev = next;
if (next) next->prev = prev;
prev = 0;
next = 0;
}
/*!
\internal
*/
QQmlComponentAttached *QQmlComponent::qmlAttachedProperties(QObject *obj)
{
QQmlComponentAttached *a = new QQmlComponentAttached(obj);
QQmlEngine *engine = qmlEngine(obj);
if (!engine)
return a;
if (QQmlEnginePrivate::get(engine)->activeVME) { // XXX should only be allowed during begin
QQmlEnginePrivate *p = QQmlEnginePrivate::get(engine);
a->add(&p->activeVME->componentAttached);
} else {
QQmlData *d = QQmlData::get(obj);
Q_ASSERT(d);
Q_ASSERT(d->context);
a->add(&d->context->componentAttached);
}
return a;
}
void QQmlComponent::create(QQmlIncubator &i, QQmlContext *context,
QQmlContext *forContext)
{
Q_D(QQmlComponent);
if (!context)
context = d->engine->rootContext();
QQmlContextData *contextData = QQmlContextData::get(context);
QQmlContextData *forContextData = contextData;
if (forContext) forContextData = QQmlContextData::get(forContext);
if (!contextData->isValid()) {
qWarning("QQmlComponent: Cannot create a component in an invalid context");
return;
}
if (contextData->engine != d->engine) {
qWarning("QQmlComponent: Must create component in context from the same QQmlEngine");
return;
}
if (!isReady()) {
qWarning("QQmlComponent: Component is not ready");
return;
}
i.clear();
QQmlIncubatorPrivate *p = i.d;
QQmlEnginePrivate *enginePriv = QQmlEnginePrivate::get(d->engine);
p->component = d->cc; p->component->addref();
p->vme.init(contextData, d->cc, d->start, d->creationContext);
enginePriv->incubate(i, forContextData);
}
class QV8IncubatorResource : public QV8ObjectResource,
public QQmlIncubator
{
V8_RESOURCE_TYPE(IncubatorType)
public:
QV8IncubatorResource(QV8Engine *engine, IncubationMode = Asynchronous);
static v8::Handle<v8::Value> StatusChangedGetter(v8::Local<v8::String>,
const v8::AccessorInfo& info);
static v8::Handle<v8::Value> StatusGetter(v8::Local<v8::String>,
const v8::AccessorInfo& info);
static v8::Handle<v8::Value> ObjectGetter(v8::Local<v8::String>,
const v8::AccessorInfo& info);
static v8::Handle<v8::Value> ForceCompletionGetter(v8::Local<v8::String>,
const v8::AccessorInfo& info);
static v8::Handle<v8::Value> ForceCompletion(const v8::Arguments &args);
static void StatusChangedSetter(v8::Local<v8::String>, v8::Local<v8::Value> value,
const v8::AccessorInfo& info);
void dispose();
v8::Persistent<v8::Object> me;
QQmlGuard<QObject> parent;
v8::Persistent<v8::Value> valuemap;
v8::Persistent<v8::Object> qmlGlobal;
protected:
virtual void statusChanged(Status);
virtual void setInitialState(QObject *);
};
static void QQmlComponent_setQmlParent(QObject *me, QObject *parent)
{
if (parent) {
me->setParent(parent);
typedef QQmlPrivate::AutoParentFunction APF;
QList<APF> functions = QQmlMetaType::parentFunctions();
bool needParent = false;
for (int ii = 0; ii < functions.count(); ++ii) {
QQmlPrivate::AutoParentResult res = functions.at(ii)(me, parent);
if (res == QQmlPrivate::Parented) {
needParent = false;
break;
} else if (res == QQmlPrivate::IncompatibleParent) {
needParent = true;
}
}
if (needParent)
qWarning("QQmlComponent: Created graphical object was not "
"placed in the graphics scene.");
}
}
/*!
\qmlmethod object Component::createObject(Item parent, object properties)
Creates and returns an object instance of this component that will have
the given \a parent and \a properties. The \a properties argument is optional.
Returns null if object creation fails.
The object will be created in the same context as the one in which the component
was created. This function will always return null when called on components
which were not created in QML.
If you wish to create an object without setting a parent, specify \c null for
the \a parent value. Note that if the returned object is to be displayed, you
must provide a valid \a parent value or set the returned object's \l{Item::parent}{parent}
property, or else the object will not be visible.
If a \a parent is not provided to createObject(), a reference to the returned object must be held so that
it is not destroyed by the garbage collector. This is true regardless of whether \l{Item::parent} is set afterwards,
since setting the Item parent does not change object ownership; only the graphical parent is changed.
As of QtQuick 1.1, this method accepts an optional \a properties argument that specifies a
map of initial property values for the created object. These values are applied before object
creation is finalized. (This is more efficient than setting property values after object creation,
particularly where large sets of property values are defined, and also allows property bindings
to be set up before the object is created.)
The \a properties argument is specified as a map of property-value items. For example, the code
below creates an object with initial \c x and \c y values of 100 and 200, respectively:
\js
var component = Qt.createComponent("Button.qml");
if (component.status == Component.Ready)
component.createObject(parent, {"x": 100, "y": 100});
\endjs
Dynamically created instances can be deleted with the \c destroy() method.
See \l {Dynamic Object Management in QML} for more information.
*/
void QQmlComponent::createObject(QQmlV8Function *args)
{