Qt SCXML Media Player Example (Dynamic)▲

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Media Player Example (Dynamic) demonstrates how to access data from a dynamically loaded ECMAScript data model.

The UI is created using Qt Widgets.

Running the Example▲

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Using the ECMAScript Data Model▲

We specify the data model as a value of the datamodel attribute of the <scxml> element in mediaplayer-common/mediaplayer.scxml:

 
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&lt;scxml
    xmlns="http://www.w3.org/2005/07/scxml"
    version="1.0"
    name="MediaPlayerStateMachine"
    initial="stopped"
    datamodel="ecmascript"
&gt;
    &lt;datamodel&gt;
        &lt;data id="media"/&gt;
    &lt;/datamodel&gt;

Dynamically Loading the State Machine▲

We link against the Qt SCXML module by adding the following line to the example .pro file:

 
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QT += widgets scxml

We dynamically create and instantiate the state machine in mediaplayer-wigdets-dynamic/mediaplayer-widgets-dynamic.cpp:

 
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#include "../mediaplayer-common/mainwindow.h"

#include &lt;QApplication&gt;
#include &lt;QScxmlStateMachine&gt;

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

    auto machine = QScxmlStateMachine::fromFile(
                QStringLiteral(":mediaplayer.scxml"));
    MainWindow mainWindow(machine);
    machine-&gt;setParent(&amp;mainWindow);

    machine-&gt;start();
    mainWindow.show();
    return app.exec();
}

Connecting to States▲

The media player state machine will send out events when users tap a control and when playback starts or stops, as specified in the SCXML file:

 
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    &lt;state id="stopped"&gt;
        &lt;transition event="tap" cond="isValidMedia()" target="playing"/&gt;
    &lt;/state&gt;

    &lt;state id="playing"&gt;
        &lt;onentry&gt;
            &lt;assign location="media" expr="_event.data.media"/&gt;
            &lt;send event="playbackStarted"&gt;
                &lt;param name="media" expr="media"/&gt;
            &lt;/send&gt;
        &lt;/onentry&gt;

        &lt;onexit&gt;
            &lt;send event="playbackStopped"&gt;
                &lt;param name=