Component setData for loading a bunch of qml files from memory.

[nizeguy]

I want to load qml files from memory using Component.setData .

The syntax is:
void QQmlComponent::setData(const QByteArray & data, const QUrl & url) [slot]

What i would like to know if it is possible to load alot of components to memory and work from there, given the QUrl as their name+relative_location.

execute like ./qmltest tutorial1.qml

my current example returns this error:

QQmlComponent: Component is not ready
"file:///tmp/hello.qml:4:1: NiButton is not a type"

my current example follows:

@
#include <QtCore>
#include <QtQuick/QtQuick>
#include <QtQml/qqml.h>
#include <QDebug>
#include <Qt/qapplication.h>

QQuickItem * createComponent(QQmlEngine * in_engine, QQmlContext * in_context, QByteArray in_data, QUrl in_url=QUrl(), QQuickItem * in_parent=0) {
QQmlComponent *component = new QQmlComponent (in_engine);
component->setData(in_data, in_url);
QQuickItem *rect = qobject_cast<QQuickItem *> ( component->create(in_context) );

if (!component->errors().isEmpty()) {
    foreach (const QQmlError &error, component->errors())
    qWarning() << error.toString();
    return 0;
}
if (in_parent)
    rect->setParentItem(qobject_cast<QQuickItem *>(in_parent));
return rect;

}

int main(int argc, char ** argv)
{
QApplication app(argc, argv);
QQuickView *qxView = new QQuickView();

QString pluginImportPath;
QQmlEngine* engine = qxView->engine();
if (pluginImportPath.isEmpty()) {
    QDir cur = QDir::current();
    cur.cd(pluginImportPath);
    pluginImportPath = cur.absolutePath();

Q(pluginImportPath );
QDir::setCurrent(pluginImportPath);
engine->addImportPath(pluginImportPath);
}

// QQmlContext * tmp_context = new QQmlContext( qxView->rootContext());
QQmlContext * tmp_context = qxView->rootContext();

app.arguments().size() ? qxView->setSource(app.arguments()[1]) : qxView->setSource(QUrl("hello.qml"));

QUrl url1 = QUrl::fromLocalFile(pluginImportPath+"/"+"hello.qml");
QByteArray data1("import QtQuick 2.0\n import \".\"\n Rectangle{ width:200; height:200; color:\"red\";\nNiButton{}}");

QUrl url2 = QUrl::fromLocalFile(pluginImportPath+"/"+"NiButton.qml");
QByteArray data2("import QtQuick 2.0\n Rectangle{ width:200; height:250; color:\"green\";}");

QQuickItem * parent1 = app.arguments().size() ? qxView->rootObject() : 0 ;

QQuickItem * item2   = createComponent(engine,tmp_context,data2,url2);

QQuickItem * item1   = createComponent(engine,tmp_context,data1,url1,parent1);


QObject::connect(qxView->engine(), SIGNAL(quit()), QCoreApplication::instance(), SLOT(quit()));
qxView->show();
return app.exec();

}
@

And a qml file to serve as qml root called tutorial1.qml:
@
import QtQuick 2.0

Rectangle {
id: page
width: 320; height: 480
color: "lightgray"
Text {
id: helloText
text: "Hello world!"
y: 30
anchors.horizontalCenter: page.horizontalCenter
font.pointSize: 24; font.bold: true
}
}
@

[tolszak]

Problem is with NiButton. Why do you create it dynamically as Item2 since you declaring it in item1?
This two files (hello.qml and NiButton.qml) are in the same directory but i think that "import "."" part is problem. Try "import ""+pluginImportPath+""\n". I suppose that import "." is not reference to hello.qml file directory.

[nizeguy]

Thanks for the reply.
Could you try if it works for you then.
I made all combinations of paths(executable dir, etc) and couldn't get it to work.

[tolszak]

Could You provide tarball of above code with examplary qml files ?