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&#40;pluginImportPath+"/"+"hello.qml"&#41;;
QByteArray data1("import QtQuick 2.0\n import \".\"\n Rectangle{ width:200; height:200; color:\"red\";\nNiButton{}}");

QUrl url2 = QUrl::fromLocalFile&#40;pluginImportPath+"/"+"NiButton.qml"&#41;;
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 ?