private void ContentFrameOnNavigated(object sender, NavigationEventArgs e)
{
// Show the back button in desktop and tablet applications
// Back button in mobile applications is automatic in the nav bar on screen
AppService.SetAppViewBackButtonVisibility(ContentFrame.CanGoBack);
// If previous page is a FileLinkPage or FolderLinkPage and the current page is of other type
if ((this.ViewModel?.ContentViewModel is FileLinkViewModel && !(this.ContentFrame?.Content is FileLinkPage)) ||
(this.ViewModel?.ContentViewModel is FolderLinkViewModel && !(this.ContentFrame?.Content is FolderLinkPage)))
{
// Remove the FolderLinkPage from the BackStack
if (NavigateService.MainFrame.BackStack.Any())
{
NavigateService.MainFrame.BackStack.Remove(NavigateService.MainFrame.BackStack.Last());
}
this.ViewModel.MenuItems = MenuItemViewModel.CreateMenuItems();
this.ViewModel.OptionItems = MenuItemViewModel.CreateOptionItems();
}
// If current page is a FileLinkPage and the previous page is of other type
if (!(this.ViewModel?.ContentViewModel is FileLinkViewModel) && this.ContentFrame?.Content is FileLinkPage)
{
this.ViewModel.MenuItems = MenuItemViewModel.CreateFileLinkMenuItems();
this.ViewModel.OptionItems = MenuItemViewModel.CreatePublicLinkOptionItems();
}
// If current page is a FolderLinkPage and the previous page is of other type
if (!(this.ViewModel?.ContentViewModel is FolderLinkViewModel) && this.ContentFrame?.Content is FolderLinkPage)
{
this.ViewModel.MenuItems = MenuItemViewModel.CreateFolderLinkMenuItems();
this.ViewModel.OptionItems = MenuItemViewModel.CreatePublicLinkOptionItems();
}
// Set current content viewmodel as property of the main page
// Could be handy in the future
this.ViewModel.ContentViewModel = (this.ContentFrame.Content as Page)?.DataContext as BasePageViewModel;
if (e.NavigationMode != NavigationMode.Back)
{
this.ViewModel.NavigateOnMenuItemSelected = false;
}
// Set current menu or option item
this.ViewModel.SelectedItem = this.ViewModel.MenuItems.FirstOrDefault(
m => NavigateService.GetViewType(m.TargetViewModel) == ContentFrame.CurrentSourcePageType);
this.ViewModel.SelectedOptionItem = this.ViewModel.OptionItems.FirstOrDefault(
m => NavigateService.GetViewType(m.TargetViewModel) == ContentFrame.CurrentSourcePageType);
this.ViewModel.NavigateOnMenuItemSelected = true;
}
/// <summary>
/// Navigate to page that holds the specified viewmodel type
/// </summary>
/// <param name="viewModelType">Type of viewmodel to navigate to</param>
/// <param name="action">Optional navigation action parameter</param>
/// <param name="parameters">Optional navigation data parameters</param>
public void NavigateTo(Type viewModelType,
NavigationActionType action = NavigationActionType.Default,
IDictionary <NavigationParamType, object> parameters = null)
{
if (viewModelType == null)
{
throw new ArgumentNullException(nameof(viewModelType));
}
var pageType = NavigateService.GetViewType(viewModelType);
if (pageType == null)
{
throw new ArgumentException("Viewmodel is not bound to a view");
}
var navObj = NavigationObject.Create(this.GetType(), action, parameters);
OnUiThread(() => this.Navigation.Navigate(pageType, false, navObj));
}