protected Selector <TModel, TSelector> Select(params Expression <Func <TSelector, object> >[] expressions)
{
foreach (var expression in expressions)
{
var member = (expression.Body as MemberExpression)?.Member;
if (member == null)
{
var unary = (expression.Body as UnaryExpression)?.Operand;
member = (unary as MemberExpression)?.Member;
}
if (member == null)
{
continue;
}
if (Selections.TryGetValue(member.Name, out var selection))
{
selection.IsSelected = true;
}
if (!SelectedProperties.ContainsKey(member.Name))
{
SelectedProperties.Add(member.Name, PropertyInfoMapping[member.Name]);
}
}
return(this);
}
public async Task OnListItemTapped(FeaturesViewModel vm)
{
// Check if the Feature is an Action
if (vm.FeatureType == FeatureType.Action)
{
// NOTE: Currently hard coded to supported actions which will require a new version of the app to support new actions.
// The server view models need to be changed to support the abstract definition of actions so they can be cerated and supported
// dynamically without a change to the code
vm.IsBusy = !vm.IsBusy;
// persist the change in busy status
FullFeatureCollection[CurrentDeviceSelection][vm.Index].IsBusy = vm.IsBusy;
if (vm.FeatureName.Contains("brew") || vm.FeatureName.Contains("Brew"))
{
if (vm.IsBusy)
{
// if it is now busy, invoke the actions
// set brew strength
// try to get the brew strength
if (!Selections.TryGetValue("Brew Strength", out Tuple <object, Type> brewStrength))
{
brewStrength = new Tuple <object, Type>(1, typeof(int));
}
var response1 = await IoTHubDataService.Instance.InvokeFeature(CurrentDeviceId, "changeBrewStrength", Convert.ToString(brewStrength.Item1));
if (response1 == null)
{
vm.IsBusy = false;
await App.Current.MainPage.DisplayAlert("Sorry", "Your Device isn't responding. \nPlease ensure it has power and is connected, and try again.", "Ok");
}
else if (response1.Status.ToLower() != "success")
{
vm.IsBusy = false;
await App.Current.MainPage.DisplayAlert("Sorry", "Your Device has sent an error. \nPlease check it and try again", "Ok");
}
else
{
// Invoke brew related feature action
var response2 = await IoTHubDataService.Instance.InvokeFeature(CurrentDeviceId, vm.FeatureMethodName, vm.FeatureMethodParameter);
// if it was actioned successfully
if (response2 == null)
{
vm.IsBusy = false;
await App.Current.MainPage.DisplayAlert("Sorry", "Your Device isn't responding. \nPlease ensure it has power and is connected, and try again.", "Ok");
}
else if (response2.Status.ToLower() != "success")
{
vm.IsBusy = false;
await App.Current.MainPage.DisplayAlert("Sorry", "Your Device has sent an error. \nPlease check it and try again", "Ok");
}
else
{
//set an asynchronous timer based upon the returned DateTimeStamp
var UTCCompleteTime = response2.TimeTillCompletion;
var currentUTCTime = DateTime.Now.ToUniversalTime();
var completeInMs = UTCCompleteTime.Subtract(currentUTCTime).TotalMilliseconds > 0 ? UTCCompleteTime.Subtract(currentUTCTime).TotalMilliseconds : 0;
TimerStateObjClass StateObj = new TimerStateObjClass {
Vm = vm, SelectedDevice = CurrentDeviceSelection
};
// Could move Timer to be a field of the deviceViewModel
TimerCallback TimerDelegate = new System.Threading.TimerCallback((o) =>
{
var state = (TimerStateObjClass)o;
state.Vm.IsBusy = false;
// Persist the busy state
FullFeatureCollection[state.SelectedDevice][state.Vm.Index].IsBusy = false;
state.TimerReference.Dispose();
});
vm.Timer = new Timer(TimerDelegate, StateObj, (int)completeInMs + 2000, Timeout.Infinite);
StateObj.TimerReference = vm.Timer;
}
}
}
else
{
// Cancel the action
var response2 = await IoTHubDataService.Instance.InvokeFeature(CurrentDeviceId, vm.FeatureMethodName, vm.FeatureMethodParameter);
if (vm.Timer != null)
{
vm.Timer.Dispose();
}
}
}
else
{
// Invoke feature action - manipulate Is busy as necessary
var response2 = await IoTHubDataService.Instance.InvokeFeature(CurrentDeviceId, vm.FeatureMethodName, vm.FeatureMethodParameter);
vm.IsBusy = false;
}
// persist the resultant busy state
FullFeatureCollection[CurrentDeviceSelection][vm.Index].IsBusy = vm.IsBusy;
}
}
