public static CustomRoutingParams GetValueOrDefault(object param, bool reuseExistingView = true)
{
CustomRoutingParams result = null;
var routeParams = param.AsRoutableViewModel<IRoutableViewModel>();
if (routeParams != null)
{
result = routeParams.Item2 as CustomRoutingParams;
}
if (result == null)
{
result = new CustomRoutingParams { ReuseExistingView = reuseExistingView };
}
return result;
}
public static CustomRoutingParams GetValueOrDefault(object param, bool reuseExistingView = true)
{
CustomRoutingParams result = null;
var routeParams = param.AsRoutableViewModel <IRoutableViewModel>();
if (routeParams != null)
{
result = routeParams.Item2 as CustomRoutingParams;
}
if (result == null)
{
result = new CustomRoutingParams {
ReuseExistingView = reuseExistingView
};
}
return(result);
}
// Routing
#region public void OnNavigate(Tuple<IRoutableViewModel, IRoutingParams> viewModelWithParams)
/// <summary>
/// Called when [navigate].
/// </summary>
/// <param name="viewModelWithParams">The view model with parameters.</param>
public void OnNavigate(Tuple <IRoutableViewModel, IRoutingParams> viewModelWithParams)
{
this.Log().Debug("OnNavigate => {0} (StackCount: {1}; CurrentFragmentTag: {2})", Convert.ToString(viewModelWithParams.Item1), App.Current.AppModel.Router.NavigationStack.Count, _currentFragmentTag);
if (viewModelWithParams != null)
{
var urlPathSegment = viewModelWithParams.Item1.UrlPathSegment;
// Reusable View?
var customRouteParams = CustomRoutingParams.GetValueOrDefault(viewModelWithParams.Item2);
var fragment = SupportFragmentManager.FindFragmentByTag(urlPathSegment);
IViewFor view = null;
if (fragment == null || !customRouteParams.ReuseExistingView)
{
var viewType = typeof(IViewFor <>);
this.Log().Debug("OnNavigate => Fragment not found for '{0}'. Create new", viewModelWithParams.Item1.GetType().Name);
view = AttemptToResolveView(viewType.MakeGenericType(viewModelWithParams.Item1.GetType()), customRouteParams.Contract);
}
else
{
this.Log().Debug("OnNavigate => Fragment found for '{0}'!!", viewModelWithParams.Item1.GetType().Name);
view = fragment as IViewFor;
}
this.Log().Debug("OnNavigate => {0}", urlPathSegment);
if (view != null)
{
var ft = SupportFragmentManager.BeginTransaction();
// Set ViewModel
if (view.ViewModel != viewModelWithParams.Item1)
{
view.ViewModel = viewModelWithParams.Item1;
}
else
{
this.Log().Debug("OnNavigate => ViewModel unchanged");
}
// Detach current fragment if different
if (!String.IsNullOrEmpty(_currentFragmentTag) && _currentFragmentTag != urlPathSegment)
{
RemoveCurrentFragment(ft);
}
// Attach
var newFragment = view as AppFragment;
if (newFragment != null)
{
if (!newFragment.IsAdded)
{
this.Log().Debug("OnNavigate => Add: {0}", urlPathSegment);
ft.Add(global::Android.Resource.Id.Content, newFragment, urlPathSegment);
}
if (newFragment.IsDetached)
{
this.Log().Debug("OnNavigate => Attach: {0}", urlPathSegment);
ft.Attach(newFragment);
}
}
ft.Commit();
// Set currentFragmentTag
_currentFragmentTag = urlPathSegment;
}
}
}