// before navigate (cancellable)
bool NavigatingFrom(bool suspending)
{
var page = FrameFacade.Content as Page;
if (page != null)
{
var dataContext = page.DataContext as INavigable;
if (dataContext != null)
{
var args = new NavigatingEventArgs
{
PageType = FrameFacade.CurrentPageType,
Parameter = FrameFacade.CurrentPageParam,
Suspending = suspending,
};
dataContext.OnNavigatingFrom(args);
return !args.Cancel;
}
}
return true;
}
private void FacadeNavigatingCancelEventHandler(object sender, NavigatingCancelEventArgs e)
{
var args = new NavigatingEventArgs(e);
foreach (var handler in _navigatingEventHandlers)
{
handler(this, args);
}
e.Cancel = args.Cancel;
}