source: trunk/doc/src/declarative/qmlruntime.qdoc@ 1036

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/*!
\page qmlruntime.html
\title Qt Declarative UI Runtime

QML documents are loaded and executed by the QML runtime. This includes the 
Declarative UI engine along with the built-in QML elements and plugin modules,
and it also provides access to third-party QML elements and modules.

Applications that use QML need to invoke the QML runtime in order to 
execute QML documents. This can be done by creating a QDeclarativeView 
or a QDeclarativeEngine, as described below. In addition, the Declarative UI 
package includes the \QQV tool, which loads \c .qml files. This tool is
useful for developing and testing QML code without the need to write
a C++ application to load the QML runtime.



\section1 Deploying QML-based applications

To deploy an application that uses QML, the QML runtime must be invoked by 
the application. This is done by writing a Qt C++ application that loads the
QDeclarativeEngine by either:

\list
\o Loading the QML file through a QDeclarativeView instance, or
\o Creating a QDeclarativeEngine instance and loading QML files with QDeclarativeComponent
\endlist


\section2 Deploying with QDeclarativeView

QDeclarativeView is a QWidget-based class that is able to load QML files.
For example, if there is a QML file, \c application.qml, like this:

\qml
    import QtQuick 1.0
    
    Rectangle { width: 100; height: 100; color: "red" }
\endqml

It can be loaded in a Qt application's \c main.cpp file like this:
 
\code
    #include <QApplication>
    #include <QDeclarativeView>

    int main(int argc, char *argv[])
    {
        QApplication app(argc, argv);

        QDeclarativeView view;
        view.setSource(QUrl::fromLocalFile("application.qml"));
        view.show();

        return app.exec();
    }
\endcode
       
This creates a QWidget-based view that displays the contents of 
\c application.qml.