/// <summary>
/// Constructor
/// </summary>
/// <param name="stateMachineInputCallback">delegate to call when there's an event to report</param>
public DelcomLight(MainAppLogic.EnqueueStateMachineInput stateMachineInputCallback, TimeSpan holdTime)
{
hUSB = DelcomLightWrapper.TryOpeningDelcomDevice();
Delcom.DelcomEnableAutoConfirm(hUSB, 0);
// Make sure we always start turned off
DelcomLightWrapper.DelcomLEDAllAction(hUSB, DelcomLightWrapper.LightStates.Off);
// remember the delegate so we can invoke when we get input
this.stateMachineInputCallback = stateMachineInputCallback;
//Initialize hold threshold from argument passed from Main
this.holdThreshold = holdTime;
// start a background thread to poll the device for input
BackgroundWorker bgw1 = new BackgroundWorker();
bgw1.DoWork += delegate { this.BackgroundPollingWorker(); };
bgw1.RunWorkerAsync();
}
/// <summary>
/// Change the color of the light, including options to flash or show for only a particular duration
/// </summary>
/// <param name="inputColor"></param>
/// <param name="steady"></param>
/// <param name="duration"></param>
public void ChangeColor(DelcomColor inputColor, bool steady, TimeSpan?duration)
{
lock (this)
{
changeColorRequestId++;
if (inputColor == DelcomColor.Off)
{
if (!DelcomLightWrapper.DelcomLEDAllAction(this.hUSB, DelcomLightWrapper.LightStates.Off) && Program.RunFromConsole)
{
Trace.TraceInformation(DateTime.Now + ": LED failure: all off");
Trace.Flush();
}
}
else
{
// convert from the publicly exposed color to the internal value
DelcomLightWrapper.LightColors color = ConvertColor(inputColor);
DelcomLightWrapper.LightStates action = steady ? DelcomLightWrapper.LightStates.On
: DelcomLightWrapper.LightStates.Flash;
if (!DelcomLightWrapper.DelcomLEDAllAction(this.hUSB, DelcomLightWrapper.LightStates.Off) && Program.RunFromConsole)
{
Trace.TraceInformation(DateTime.Now + ": LED failure: all off");
Trace.Flush();
}
if (!DelcomLightWrapper.DelcomLEDAction(this.hUSB, color, action) && Program.RunFromConsole)
{
Trace.TraceInformation(DateTime.Now + ": LED failure: " + Enum.GetName(typeof(DelcomLightWrapper.LightColors), color) +
" " + Enum.GetName(typeof(DelcomLightWrapper.LightStates), action));
Trace.Flush();
}
// We need to only have the light on for the requested duration
if (duration != null)
{
// Create a callback that will safely turn the light off
TimerCallback callback = new TimerCallback(delegate(object state)
{
// Get the current button action (as of the callback)
int currentButtonAction = -1;
lock (this)
{
currentButtonAction = this.changeColorRequestId;
}
int rememberedButtonAction = (int)state;
// Compare the current buttonaction to the remembered action
if (currentButtonAction == rememberedButtonAction)
{
// Only turn the light off if they still match, otherwise we've moved on to a new action
if (!DelcomLightWrapper.DelcomLEDAllAction(this.hUSB, DelcomLightWrapper.LightStates.Off) && Program.RunFromConsole)
{
Trace.TraceInformation(DateTime.Now + ": LED failure: all off");
Trace.Flush();
}
}
else
{
// Another request has come in while waiting for the timer to fire, ignore the delayed request to turn the light off
}
});
// Make a timer
Timer ledTimer = new Timer(
callback,
changeColorRequestId,
duration.Value,
TimeSpan.Zero);
}
}
}
}