Qt SCXML Media Player QML Example (Dynamic)

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

The UI is created using Qt Quick.

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:

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

Dynamically Loading the State Machine

We link against the Qt SCXML module by adding the following line to the project build files.

With qmake to the mediaplayer-qml-dynamic.pro

QT += qml scxml

With cmake to the CMakeLists.txt

find_package(Qt6 COMPONENTS Core Gui Qml Scxml)

target_link_libraries(mediaplayer-qml-dynamic PUBLIC
    Qt6::Core
    Qt6::Gui
    Qt6::Qml
    Qt6::Scxml
)

We dynamically create the state machine in mediaplayer-common\Mediaplayer.qml:

import QtScxml

Window {
    id: root
    property StateMachine stateMachine: scxmlLoader.stateMachine
    property alias source: scxmlLoader.source

Example project @ code.qt.io