// An event handler that runs when a "signalR.StateChanged" event is triggered in SignalRClient
// (result of "START_SENSOR" or "STOP_SENSOR" message from hub, i.e. other clients asked hub to start/stop sensor)
private async void SignalR_StateChanged(object sender, StateChangedEventArgs e)
{
SignalRClient signalR = sender as SignalRClient;
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
// If sensor is not already running (i.e. client requested to START_SENSOR)
if (!e.IsRunning)
{
// Turns the toggle switch to ON
toggleSwitch.IsOn = true;
}
// else if sensor is already running (i.e. client requested to STOP_SENSOR)
else
{
// Turns the toggle switch to OFF
toggleSwitch.IsOn = false;
}
// If the message received from hub is not empty
if (!String.IsNullOrEmpty(e.State))
{
// Sets the display text to the message received from hub
messageFromClient.Text = e.State;
}
});
}
// An event handler that runs when a "sensor.StateChanged" event is triggered in SensorSource
private async void Sensor_StateChanged(object sender, StateChangedEventArgs e)
{
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
{
// If the sensor is running, i.e. turned ON
if (e.IsRunning)
{
// Changes the display text on the XAML file to reflect that sensor is running
sensorStatus.Text = "Sensor Status: Running";
icon.Foreground = new SolidColorBrush(Colors.Black);
}
// else if the sensor is not running, i.e. turned OFF
else
{
// Changes the display text on the XAML file to reflect that sensor is not running
sensorStatus.Text = "Sensor Status: Stopped";
tbkValue.Text = "[n/a]";
icon.Foreground = new SolidColorBrush(Colors.Gray);
if (hub == null) return;
try
{
// Executes a method "newUpdate" on the server side hub asynchronously, with params of type Object[]
// (notifies clients that sensor is turned off)
await hub.Invoke("newUpdate", new object[] { "SENSOR_OFF", "[n/a]" });
}
catch { }
}
});
}