/// <summary>
/// Implements a simple navigation and message stateless state machine. The prior parameter is the ViewModel of the
/// page that caused the transition. It may be null, so test before using. This is included in case there may be information
/// relevant to actions or messages. This method may not be called on the UI thread.
/// </summary>
/// <param name="ce">The event to respond to</param>
/// <param name="prior">The ViewModel of the screen that caused the transition. May be null.</param>
/// <returns></returns>
public virtual async Task OnResult(CognitoEvent ce, CognitoFormsViewModel prior)
{
PageModelPair pair = null;
switch (ce)
{
case CognitoEvent.DoSignup:
pair = CreatePageModelPair(PageId.SignUp, AuthApi, SessionStore);
pair.Page.BindingContext = pair.ViewModel;
Device.BeginInvokeOnMainThread(async() =>
{
await Navigation.PushAsync(pair.Page, true);
});
break;
case CognitoEvent.Authenticated:
await Authenticated?.Invoke();
break;
case CognitoEvent.BadPassword:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.SignInTitle, Strings.BadPassMessage, Strings.OkButton);
});
break;
case CognitoEvent.UserNotFound:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.UserNotFoundTitle, Strings.UserNotFoundMessage, Strings.OkButton);
});
break;
case CognitoEvent.PasswordChangedRequired:
pair = CreatePageModelPair(PageId.UpdatePassword, AuthApi, SessionStore);
pair.Page.BindingContext = pair.ViewModel;
Device.BeginInvokeOnMainThread(async() =>
{
await Navigation.PushAsync(pair.Page, true);
});
break;
case CognitoEvent.RegistrationComplete:
Device.BeginInvokeOnMainThread(async() =>
{
pair = CreatePageModelPair(PageId.ValidateCode, AuthApi, SessionStore);
pair.Page.BindingContext = pair.ViewModel;
await Navigation.PushAsync(pair.Page, true);
});
break;
case CognitoEvent.AccountVerified:
Device.BeginInvokeOnMainThread(async() =>
{
await Navigation.PopToRootAsync();
});
break;
case CognitoEvent.PasswordUpdated:
Device.BeginInvokeOnMainThread(async() =>
{
await Navigation.PopAsync(true);
});
break;
case CognitoEvent.BadCode:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.BadCodeTitle, Strings.BadCodeMessage, Strings.OkButton);
});
break;
case CognitoEvent.PasswordUpdateFailed:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.PassUpdateFailedTitle, Strings.PassUpdateFailedMessage, Strings.OkButton);
});
break;
case CognitoEvent.UserNameAlreadyUsed:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.SignupFailedTitle, Strings.UserNameUsed, Strings.OkButton);
});
break;
case CognitoEvent.PasswordRequirementsFailed:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.SignupFailedTitle, Strings.MinimalPasswordRequirements, Strings.OkButton);
});
break;
case CognitoEvent.AccountConfirmationRequired:
Device.BeginInvokeOnMainThread(async() =>
{
await Page.DisplayAlert(Strings.SignInTitle, Strings.RequiresValidation, Strings.OkButton);
pair = CreatePageModelPair(PageId.ValidateCode, AuthApi, SessionStore);
pair.Page.BindingContext = pair.ViewModel;
await Navigation.PushAsync(pair.Page, true);
});
break;
default:
break;
}
}
public PageModelPair(ContentPage page, CognitoFormsViewModel viewModel)
{
Page = page;
ViewModel = viewModel;
}
