src/declarative/qml/v8/qv8typewrapper.cpp

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  41
  42 #include "qv8contextwrapper_p.h"
  43 #include "qv8engine_p.h"
  44
  45 #include <private/qdeclarativeengine_p.h>
  46 #include <private/qdeclarativecontext_p.h>
  47
  48 QT_BEGIN_NAMESPACE
  49
  50 class QV8TypeResource : public QV8ObjectResource
  51 {
  52     V8_RESOURCE_TYPE(TypeType);
  53
  54 public:
  55     QV8TypeResource(QV8Engine *engine);
  56     virtual ~QV8TypeResource();
  57
  58     QV8TypeWrapper::TypeNameMode mode;
  59
  60     QDeclarativeGuard<QObject> object;
  61     QDeclarativeType *type;
  62     QDeclarativeTypeNameCache *typeNamespace;
  63 };
  64
  65 QV8TypeResource::QV8TypeResource(QV8Engine *engine)
  66 : QV8ObjectResource(engine), mode(QV8TypeWrapper::IncludeEnums), type(0), typeNamespace(0)
  67 {
  68 }
  69
  70 QV8TypeResource::~QV8TypeResource()
  71 {
  72     if (typeNamespace) typeNamespace->release();
  73 }
  74
  75 QV8TypeWrapper::QV8TypeWrapper()
  76 : m_engine(0)
  77 {
  78 }
  79
  80 QV8TypeWrapper::~QV8TypeWrapper()
  81 {
  82 }
  83
  84 void QV8TypeWrapper::destroy()
  85 {
  86     qPersistentDispose(m_constructor);
  87 }
  88
  89 void QV8TypeWrapper::init(QV8Engine *engine)
  90 {
  91     m_engine = engine;
  92     v8::Local<v8::FunctionTemplate> ft = v8::FunctionTemplate::New();
  93     ft->InstanceTemplate()->SetNamedPropertyHandler(Getter, Setter);
  94     ft->InstanceTemplate()->SetHasExternalResource(true);
  95     m_constructor = qPersistentNew<v8::Function>(ft->GetFunction());
  96 }
  97
  98 v8::Local<v8::Object> QV8TypeWrapper::newObject(QObject *o, QDeclarativeType *t, TypeNameMode mode)
  99 {
 100     Q_ASSERT(t);
 101     // XXX NewInstance() should be optimized
 102     v8::Local<v8::Object> rv = m_constructor->NewInstance();
 103     QV8TypeResource *r = new QV8TypeResource(m_engine);
 104     r->mode = mode; r->object = o; r->type = t;
 105     rv->SetExternalResource(r);
 106     return rv;
 107 }
 108
 109 v8::Local<v8::Object> QV8TypeWrapper::newObject(QObject *o, QDeclarativeTypeNameCache *t, TypeNameMode mode)
 110 {
 111     Q_ASSERT(t);
 112     // XXX NewInstance() should be optimized
 113     v8::Local<v8::Object> rv = m_constructor->NewInstance();
 114     QV8TypeResource *r = new QV8TypeResource(m_engine);
 115     t->addref();
 116     r->mode = mode; r->object = o; r->typeNamespace = t;
 117     rv->SetExternalResource(r);
 118     return rv;
 119 }
 120
 121 v8::Handle<v8::Value> QV8TypeWrapper::Getter(v8::Local<v8::String> property,
 122                                              const v8::AccessorInfo &info)
 123 {
 124     v8::Object::ExternalResource *r = info.This()->GetExternalResource();
 125     QV8TypeResource *resource = v8_resource_cast<QV8TypeResource>(info.This());
 126
 127     if (!resource)
 128         return v8::Undefined();
 129
 130     QV8Engine *v8engine = resource->engine;
 131     QObject *object = resource->object;
 132
 133     QHashedV8String propertystring(property);
 134
 135     if (resource->type) {
 136         QDeclarativeType *type = resource->type;
 137
 138         if (QV8Engine::startsWithUpper(property)) {
 139             if (resource->mode == IncludeEnums) {
 140                 QString name = v8engine->toString(property);
 141
 142                 // ### Optimize
 143                 QByteArray enumName = name.toUtf8();
 144                 const QMetaObject *metaObject = type->baseMetaObject();
 145                 for (int ii = metaObject->enumeratorCount() - 1; ii >= 0; --ii) {
 146                     QMetaEnum e = metaObject->enumerator(ii);
 147                     int value = e.keyToValue(enumName.constData());
 148                     if (value != -1)
 149                         return v8::Integer::New(value);
 150                 }
 151             }
 152
 153             // Fall through to undefined
 154
 155         } else if (resource->object) {
 156             QObject *ao = qmlAttachedPropertiesObjectById(type->attachedPropertiesId(), object);
 157             if (ao)
 158                 return v8engine->qobjectWrapper()->getProperty(ao, propertystring,
 159                                                                QV8QObjectWrapper::IgnoreRevision);
 160
 161             // Fall through to undefined
 162         }
 163
 164         // Fall through to undefined
 165
 166     } else if (resource->typeNamespace) {
 167
 168         QDeclarativeTypeNameCache *typeNamespace = resource->typeNamespace;
 169         QDeclarativeTypeNameCache::Data *d = typeNamespace->data(propertystring);
 170         Q_ASSERT(!d || !d->typeNamespace); // Nested namespaces not supported
 171
 172         if (d && d->type) {
 173             return v8engine->typeWrapper()->newObject(object, d->type, resource->mode);
 174         } else if (QDeclarativeMetaType::ModuleApiInstance *moduleApi = typeNamespace->moduleApi()) {
 175             // XXX TODO: Currently module APIs are implemented against QScriptValues.  Consequently we
 176             // can't do anything here until the QtScript/V8 binding is complete.
 177             return v8::Undefined();
 178
 179         }
 180
 181         // Fall through to undefined
 182
 183     } else {
 184         Q_ASSERT(!"Unreachable");
 185     }
 186     return v8::Undefined();
 187 }
 188
 189 v8::Handle<v8::Value> QV8TypeWrapper::Setter(v8::Local<v8::String> property,
 190                                              v8::Local<v8::Value> value,
 191                                              const v8::AccessorInfo &info)
 192 {
 193     v8::Object::ExternalResource *r = info.This()->GetExternalResource();
 194     QV8TypeResource *resource = v8_resource_cast<QV8TypeResource>(info.This());
 195
 196     if (!resource)
 197         return value;
 198
 199     QV8Engine *v8engine = resource->engine;
 200
 201     // XXX TODO: Implement writes to module API objects
 202
 203     QHashedV8String propertystring(property);
 204
 205     if (resource->type && resource->object) {
 206         QDeclarativeType *type = resource->type;
 207         QObject *object = resource->object;
 208         QObject *ao = qmlAttachedPropertiesObjectById(type->attachedPropertiesId(), object);
 209         if (ao)
 210             v8engine->qobjectWrapper()->setProperty(ao, propertystring, value,
 211                                                     QV8QObjectWrapper::IgnoreRevision);
 212     }
 213
 214     return value;
 215 }
 216
 217 QT_END_NAMESPACE