public void ShowPreviousStep()
{
//if there are still steps/questions
if (StepList.Any())
{
//get the last step in the list
var lastStep = StepList.Last();
//display it
ShowStep(lastStep);
}
else
{
//if there are no steps remaining, call OnBackPressed
base.OnBackPressed();
}
}
public async void ShowStep(Step processFlowStep)
{
//either display the step or remove it from the persisted step list
if (processFlowStep != null)
{
var stepToAddRemove = processFlowStep;
if (StepList.Contains(stepToAddRemove))
{
//text/numeric/date input answers to be removed from state
if (stepToAddRemove.Type != (int)StepInputTypeEnum.Options)
{
//remove the saved answer from persisted state
StepAnswersDictionary.Remove(stepToAddRemove.Id);
}
//if it already exists in the persisted step list, remove it
StepList.Remove(stepToAddRemove);
if (StepList.Any())
{
//and get the step before it
stepToAddRemove = StepList.Last();
}
else
{
//if after removing and there are no more steps, go back to the previous activity
base.OnBackPressed();
}
}
else
{
//if it doesnt exist in the persisted step list, add it
StepList.Add(stepToAddRemove);
}
//instantiate a new Step Fragment
var processFlowFragment = new ProcessFlowFragment();
Bundle args = new Bundle();
//serialize the object to a step definition string
var processFlowString = JsonConvert.SerializeObject(stepToAddRemove);
//pass the step string definition to the fragment in the bundle
args.PutString(ProcessFlowStep, processFlowString);
// if the step to be shown is a text/numeric/date input, check the dictionary for a saved answer entered previously and pass it to the fragment
if (stepToAddRemove.Type != (int)StepInputTypeEnum.Options)
{
string stepAnwer = null;
if (StepAnswersDictionary.TryGetValue(stepToAddRemove.Id, out stepAnwer))
{
Logger.Verbose(stepToAddRemove.HeaderText + " : Answer found in Dictionary to be shown in Fragment : " + stepAnwer);
}
args.PutString(ProcessFlowStepAnswer, stepAnwer);
}
processFlowFragment.Arguments = args;
//display the fragment
ReplaceFragment(processFlowFragment, Resource.Id.ticket_placeholder, TicketFragmentTag);
}
}