Create a QML component from string - string

Question

It is possible to create QML components from files using Qt.createComponent(filename)
It is possible to create QML object from strings using Qt.createQmlObject(string)
It is possible to create QML components from code via Component {...}
But is it possible to create a QML component from a string? I mean without going thorugh the effort of saving it as a temp file just for the sake of using Qt.createComponent(filename)?
EDIT: Just to clarify, I already have the components in this example form:
import QtQuick 2.0
Rectangle {
width: 100
height: 100
color: "red"
}
So I need to create a component from that string without instantiating it. I can't simply wrap the string in a "Component {" + string + "}" because imports can not be declared inside a component. One solution would be to use complex parsing to insert the component just before the first element and after the imports, but it doesn't strike me as the most elegant solution to go about.

Answer 1

Almost 7 years later I've run into the need to do this myself, so I thought I'd elaborate on the comment I left on the question.
For my use case, a singleton does a better job. You can use it in QML like this:
import MyModule 1.0
// ...
Loader {
sourceComponent: QmlComponentCreator.createComponent("import QtQuick 2.0; Item {}")
}
The C++ implementation is below.
QmlComponentCreator.h:
#ifndef QMLCOMPONENTCREATOR_H
#define QMLCOMPONENTCREATOR_H
#include <QObject>
#include <QQmlComponent>
class QmlComponentCreator : public QObject
{
Q_OBJECT
public:
QmlComponentCreator() = default;
Q_INVOKABLE QQmlComponent *createComponent(const QByteArray &data) const;
};
#endif // QMLCOMPONENTCREATOR_H
QmlComponentCreator.cpp:
#include "QmlComponentCreator.h"
#include <QtQml>
QQmlComponent *QmlComponentCreator::createComponent(const QByteArray &data)
{
QQmlComponent *component = new QQmlComponent(qmlEngine(this));
QQmlEngine::setObjectOwnership(component, QQmlEngine::JavaScriptOwnership);
component->setData(data, QUrl());
if (component->isError())
qmlWarning(this) << "Failed to create component from the following data string:\n" << data;
return component;
}
Somewhere in main.cpp, or wherever you register your types:
qmlRegisterSingletonType<QmlComponentCreator>("MyModule", 1, 0, "QmlComponentCreator",
[](QQmlEngine *, QJSEngine *) { return new QmlComponentCreator; });

Answer 2

use Qt.createQmlObject(string). It creates an object, not prototype.
Window {
id: mainWindow
visible: true
width: 600
height: 400
Component.onCompleted: {
var str = '
import QtQuick 2.3;
Component {
Text {
text: "Hello, world!";
anchors.fill: parent;
horizontalAlignment: Text.AlignHCenter;
verticalAlignment: Text.AlignVCenter;
}
}';
var component = Qt.createQmlObject(str,mainWindow);
var object = component.createObject(mainWindow);
}
}