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