Qt SCXML Media Player Example (Dynamic)#
A widget-based application that sends data to and receives it from a dynamically loaded ECMAScript data model.
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:
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-widgets-dynamic.pro
With cmake to the CMakeLists.txt
We dynamically create and instantiate the state machine in mediaplayer-wigdets-dynamic/mediaplayer-widgets-dynamic.cpp:
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:
To be notified when a state machine sends out an event, we connect to the corresponding signals: