public static async Task PopupGoBackAsync(this INavigationService navigationService, NavigationParameters parameters = null, bool animate = true)
{
if (s_popupStack.Count == 0)
{
return;
}
var page = s_popupStack.Last();
EnsureParametersContainsMode(parameters ?? (parameters = PopupUtilities.CreateBackNavigationParameters()), NavigationMode.Back);
HandleINavigatedAware(page, parameters, navigatedTo: false);
HandleIDestructiblePage(page);
await s_popupNavigation.PopAsync(animate);
Page currentPage = s_popupStack.LastOrDefault();
if (currentPage == null)
{
currentPage = GetCurrentPage();
}
HandleINavigatedAware(currentPage, parameters, navigatedTo: true);
}
private static void HandleINavigatedAware(Page page, NavigationParameters parameters, bool navigatedTo)
{
if (page == null)
{
return;
}
if (parameters == null)
{
parameters = navigatedTo ?
PopupUtilities.CreateNewNavigationParameters() :
PopupUtilities.CreateBackNavigationParameters();
}
PageUtilities.InvokeViewAndViewModelAction <INavigatedAware>(page, (view) => {
if (navigatedTo)
{
view.OnNavigatedTo(parameters);
}
else
{
view.OnNavigatedFrom(parameters);
}
});
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(page, (view) => view.IsActive = navigatedTo);
}