/// <summary>
/// Given a view model attempts to close the fragment associated with it. If the fragment
/// associated is currently being displayed in the fragment host then the backstack
/// is popped.
/// </summary>
/// <param name="viewModel"></param>
/// <returns></returns>
public bool Close(IMvxViewModel viewModel)
{
var fragmentTypeToClose = SupportedFragmentViewModels[viewModel.GetType()];
if (CurrentFragment != null && CurrentFragment.GetType() == fragmentTypeToClose)
{
FragmentManager.PopBackStackImmediate();
this.FragmentChanged();
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Remove all fragments from the back stack up to, but not including the specified view.
/// </summary>
/// <remarks>
/// If the specified view is not found then all fragments will be removed up to, but not including, the initial view.
/// </remarks>
public void CloseUpToView(Type viewModelType)
{
var targetFragmentType = SupportedFragmentViewModels[viewModelType];
var backStackEntryCount = FragmentManager.BackStackEntryCount;
for (var i = 0; i < backStackEntryCount; i++)
{
if (CurrentFragment.GetType() == targetFragmentType)
{
break;
}
FragmentManager.PopBackStackImmediate();
}
this.FragmentChanged();
}
/// <summary>
/// This method does the actual loading of the fragment depending on current step.
/// </summary>
private void LoadFragment()
{
if (_currentFragmentType == null)
{
throw new InvalidOperationException("Cannot load fragment if there is CurrentFragmentType == null.");
}
// load the fragment needed
CurrentFragment = Activator.CreateInstance(_currentFragmentType) as WizardStepFragment;
if (CurrentFragment == null)
{
throw new Exception("Fragments used for steps in the wizard must inherit WizardStepFragment. Yours does not.");
}
if (!StepsHistory.ContainsKey(_currentStep))
{
StepsHistory.Add(_currentStep, CurrentFragment.GetType());
}
else
{
StepsHistory[_currentStep] = CurrentFragment.GetType();
}
if (!_serializedData.IsBlank())
{
RunOnUiThread(() => { CurrentFragment.SetData(_serializedData); });
}
// load the actual fragment needed
if (!_isHidden)
{
SupportFragmentManager.BeginTransaction()
.Replace(Resource.Id.frameContent, CurrentFragment, CurrentFragment.FragmentTag)
.Commit();
}
this.SetButtonTitles();
_fragmentButtons.SelectStep(_currentStep);
HideKeyboard(true);
}