private async void ViewModel_NavigateToPage(object sender, AppNavigationEventArgs e)
{
InnerMenuGrid.FadeTo(0, 100);
await MenuGrid.LayoutTo(new Rectangle(0, 0, Width, 0), 100, Easing.CubicOut);
MenuGrid.FadeTo(0, 100);
switch (e.Target)
{
case AppNavigation.Root:
while (Navigation.NavigationStack.Count > 2)
{
Navigation.RemovePage(Navigation.NavigationStack[Navigation.NavigationStack.Count - 2]);
}
await Navigation.PopAsync();
break;
case AppNavigation.Talents:
await Navigation.PushAsync(new TalentsPage(ViewModel.SessionHandler));
break;
case AppNavigation.NewDocument:
await Navigation.PushAsync(new CreateDocumentPage(ViewModel.SessionHandler));
break;
case AppNavigation.Documents:
await Navigation.PushAsync(new DocumentsListPage(ViewModel.SessionHandler));
break;
}
}
/// <summary>
/// Basic navigation implementation, you should only call it from a class that inherits from IViewModel
/// </summary>
/// <param name="sender">View model that triggered this event</param>
/// <param name="navigationArgs">Arguments passed for navigation</param>
private async void NavigateTo(object sender, AppNavigationEventArgs navigationArgs)
{
try
{
//Get the type of the view model
var navigationType = navigationArgs.ViewModel.GetType();
//Search for the type in the registered pairs
if (!_viewViewModelPairs.ContainsKey(navigationType))
{
throw new ArgumentOutOfRangeException(nameof(navigationArgs.ViewModel));
}
//If the triggering, make sure you call navigate from & unsubscribe from the event subscribed to below
if (sender is IViewModel currentViewModel)
{
await currentViewModel.NavigateFrom();
currentViewModel.RequestNavigation -= NavigateTo;
}
//Remove any & all children from our NavigationGrid that we use for navigation
NavigationGrid.Children.Clear();
//Get an existing view from the registered view - view model pairs
var view = _viewViewModelPairs[navigationType];
//Set the data context of the view to the view model
view.DataContext = navigationArgs.ViewModel;
//Subscribe to the navigated event, this will be called when the view model wants to navigate to the next page
navigationArgs.ViewModel.RequestNavigation += NavigateTo;
//Add the view that we recieved as a child of the NavigationGrid
NavigationGrid.Children.Add(view);
//Call the navigate to, in order to initialize the view model
await navigationArgs.ViewModel.NavigateTo();
}
catch (Exception e)
{
Console.WriteLine($"Unhandled exception occured: {e.Message}");
}
}
