void InvokeOnNavigatedFrom(object item, NavigationContext navigationContext)
{
var navigationAwareItem = item as INavigationAware;
if (navigationAwareItem != null)
{
navigationAwareItem.OnNavigatedFrom(navigationContext);
}
var frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
INavigationAware navigationAwareDataContext = frameworkElement.DataContext as INavigationAware;
if (navigationAwareDataContext != null)
{
navigationAwareDataContext.OnNavigatedFrom(navigationContext);
}
if (frameworkElement != null)
{
var viewModel = frameworkElement.DataContext;
Type viewModelType = viewModel.GetType();
MethodInfo methodInfo = viewModelType.GetMethod("DisposeEvents");
if (methodInfo != null)
{
methodInfo.Invoke(viewModel, null);
}
}
}
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
INavigationAware vm = DataContext as INavigationAware;
if (vm != null)
{
vm.OnNavigatedFrom(e.Parameter, e.NavigationMode);
}
base.OnNavigatedFrom(e);
}
private void ExecuteSearch(string phrase)
{
var searchBar = SearchBarService.Current;
if (searchBar != null)
{
UriQuery query = new UriQuery(searchBar.Parameters.ToString());
query.Add(SearchBar.ValueParameter, phrase);
query.Add(SearchBar.IsFromSearchBarParameter, "true");
IRegion viewRegion = RegionManager.Regions[AppRegions.ViewRegion];
IRegionNavigationService navigation = viewRegion.NavigationService;
if (navigation.Journal.CurrentEntry != null)
{
if (navigation.Journal.CurrentEntry.Uri.OriginalString.StartsWith(searchBar.NavigationUri.OriginalString))
{
INavigationAware navAware = null;
var activeView = viewRegion.ActiveViews.FirstOrDefault();
if (activeView is INavigationAware)
{
navAware = activeView as INavigationAware;
}
else
{
FrameworkElement element = activeView as FrameworkElement;
if (element != null && element.DataContext is INavigationAware)
{
navAware = element.DataContext as INavigationAware;
}
}
if (navAware != null)
{
navAware.OnNavigatedFrom(new NavigationContext(navigation,
navigation.Journal.CurrentEntry.Uri));
navAware.OnNavigatedTo(new NavigationContext(navigation,
new Uri(
searchBar.NavigationUri.ToString() + query,
UriKind.RelativeOrAbsolute)));
return;
}
}
}
RegionManager.RequestNavigate(AppRegions.ViewRegion, searchBar.NavigationUri.ToString() + query);
}
}
void InvokeOnNavigatedFrom(object item, NavigationContext navigationContext)
{
var navigationAwareItem = item as INavigationAware;
if (navigationAwareItem != null)
{
navigationAwareItem.OnNavigatedFrom(navigationContext);
}
var frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
INavigationAware navigationAwareDataContext = frameworkElement.DataContext as INavigationAware;
navigationAwareDataContext?.OnNavigatedFrom(navigationContext);
}
}
private async Task <NavigationResult> HandleViewModelNavigation(INavigationAware fromPageVM, INavigationAware toPageVM, INavigationParameters parameters)
{
if (fromPageVM != null)
{
try
{
fromPageVM.OnNavigatedFrom(parameters);
}
catch (Exception ex)
{
return(new NavigationResult()
{
IsSuccess = false, Exception = ex
});
}
}
if (toPageVM != null)
{
try
{
toPageVM.OnNavigatingTo(parameters);
toPageVM.OnNavigatedTo(parameters);
await toPageVM.OnNavigatedToAsync(parameters);
}
catch (Exception ex)
{
return(new NavigationResult()
{
IsSuccess = false, Exception = ex
});
}
}
return(new NavigationResult()
{
IsSuccess = true
});
}
protected override void OnPause()
{
base.OnPause();
_navigationAwareVm?.OnNavigatedFrom();
}