Variable Event Example

Example 1: Linking an instance to another class.

Class declaration

 ++
class ClientOrServer
{
    public:
        virtual ClientOrServer(bool client);
 
    private:
        Variable _variable;
        TVariableHandler<ClientOrServer> _eventHandler;
        void eventHandler
        (
            Variable::EEvent event,
            const Variable& caller,
            Variable& link,
            bool sameinst
        );
};

Class implementation.

 ++
ClientOrServer::ClientOrServer()
  :_eventHandler(this, &ClientOrServer::eventHandler)
{
    // Link handler to the variable instance.
    Fvariable->setHandler(&_eventHandler);
    if (client)
    {
        // Setup instance as a client which triggers events.
        _variable.setup(0x98001);
    }
    else
    {
        // Setup instance as a server which triggers events.
        _variable.setup
        (
            "0x98001,Calibrate|Blue Pos,%,ASP,"
            "Blue position for calibrating the C-scan plot.,"
            "FLOAT,,"
            "0.1,50,0,100"
        );
    }
}
 
void ClientOrServer::eventHandler
(
    Variable::EEvent event,
    const Variable& caller,
    Variable& link,
    bool sameinst
)
{
    switch (event)
    {
        case Variable::veFlagsChange:
        // Handle something
        break;
        
        case Variable::veValueChange:
        // Handle something
        break;
        
        case Variable::veConverted:
        // Handle something
        break;
        
        case Tvariable::veIdChanged:
        // Handle something
        break;
    }
}