public NavigationService(IEnumerable<INavigationStep> steps)
{
Steps = steps;
CurrentStep = steps.FirstOrDefault(s => s.IsAllowed);
if (CurrentStep == null)
throw Errors.NoAvailableSteps();
}
private void OnCurrentStepChanged(INavigationStep newStep)
{
var isSummaryStep = newStep is ISummaryStep;
var isImportStep = newStep is IActionStep;
ShowNavigateToPreviousStepButton = !isImportStep;
ShowNavigateToNextStepButton = !isImportStep && !isSummaryStep;
ShowStartImportButton = isSummaryStep;
ShowStartNewImportButton = ShowCancelImportButton = isImportStep;
}
private void OnCurrentStepChanged(INavigationStep newStep)
{
var isSummaryStep = newStep is ISummaryStep;
var isImportStep = newStep is IActionStep;
ShowNavigateToPreviousStepButton = !isImportStep;
ShowNavigateToNextStepButton = !isImportStep && !isSummaryStep;
ShowStartImportButton = isSummaryStep;
ShowStartNewImportButton = ShowCancelImportButton = isImportStep;
}
public NavigationService(IEnumerable <INavigationStep> steps)
{
Steps = steps;
CurrentStep = steps.FirstOrDefault(s => s.IsAllowed);
if (CurrentStep == null)
{
throw Errors.NoAvailableSteps();
}
}
public bool RemoveStep(INavigationStep step)
{
var removed = this._steps.Remove(step);
if (removed)
{
step.Changed -= this.StepOnChanged;
}
return(removed);
}
protected override INavigationStep GetTargetStep()
{
var currentStep = NavigationService.CurrentStep;
INavigationStep previousAllowedStep = null;
foreach (var step in NavigationService.Steps)
{
if (step == currentStep)
{
break;
}
if (step.IsAllowed)
{
previousAllowedStep = step;
}
}
return(previousAllowedStep);
}
public void AddStep(INavigationStep step)
{
this._steps.Add(step);
step.Changed += this.StepOnChanged;
}