/// <summary>
/// Called when the Frame.Loaded event fires.
/// </summary>
/// <param name="sender">The object raising the event</param>
/// <param name="e">The event arguments</param>
private void Frame_Loaded(object sender, RoutedEventArgs e)
{
this._navigationService.InitializeJournal();
if (this.ContentLoader == null)
{
this.ContentLoader = new PageResourceContentLoader();
}
this._navigationService.InitializeNavigationCache();
// Set loaded flag
this._loaded = true;
// Don't attempt to load anything at design-time
if (!Frame.IsInDesignMode())
{
UriMapperBase mapper = this.UriMapper;
// If there's a deeplink, don't check Source as the deeplink overrides it
if (this.ApplyDeepLinks() == false)
{
if (this._deferredNavigation != null)
{
this.Navigate(this._deferredNavigation);
this._deferredNavigation = null;
}
// Check if source property was set
else if (this.Source != null)
{
this.Navigate(this.Source);
}
// If no Source was set, we may still be able to use UriMapper to convert this to a navigable Uri
else if (mapper != null)
{
Uri emptyUri = new Uri(String.Empty, UriKind.Relative);
Uri mappedUri = mapper.MapUri(emptyUri);
if (mappedUri != null && !String.IsNullOrEmpty(mappedUri.OriginalString))
{
this.Navigate(emptyUri);
}
}
}
}
else
{
if (this.Source != null)
{
this.Content = String.Format(CultureInfo.InvariantCulture, Resource.Frame_DefaultContent, this.Source.ToString());
}
else
{
this.Content = typeof(Frame).Name;
}
}
}
private bool NavigateCore(Uri uri, NavigationMode mode, bool suppressJournalAdd, bool isRedirect)
{
try
{
if (uri == null)
{
throw new ArgumentNullException("uri", Resource.NavigationService_NavigationToANullUriIsNotSupported);
}
// Make sure we're on the UI thread because of the DependencyProperties we use.
if (!this.Host.Dispatcher.CheckAccess())
{
// Move to UI thread
this.Host.Dispatcher.BeginInvoke(() => this.NavigateCore(uri, mode, suppressJournalAdd, isRedirect));
return(true);
}
Uri mappedUri = uri;
// If the Uri is only a fragment, mapping does not take place
if (!UriParsingHelper.InternalUriIsFragment(uri))
{
UriMapperBase mapper = this.Host.UriMapper;
if (mapper != null)
{
Uri uriFromMapper = mapper.MapUri(uri);
if (uriFromMapper != null && !String.IsNullOrEmpty(uriFromMapper.OriginalString))
{
mappedUri = uriFromMapper;
}
else
{
mappedUri = uri;
}
}
}
Uri mergedUriAfterMapping = UriParsingHelper.InternalUriMerge(this._currentSourceAfterMapping, mappedUri) ?? mappedUri;
Uri mergedUri = UriParsingHelper.InternalUriMerge(this._currentSource, uri) ?? uri;
// If we're navigating to just a fragment (i.e. "#frag1") or to a page which differs only in the fragment
// (i.e. "Page.xaml?id=123" to "Page.xaml?id=123#frag1") then complete navigation without involving the content loader
bool isFragmentNavigationOnly = (mode != NavigationMode.Refresh) &&
(UriParsingHelper.InternalUriIsFragment(mappedUri) ||
UriParsingHelper.InternalUriGetAllButFragment(mergedUri) == UriParsingHelper.InternalUriGetAllButFragment(this._currentSource));
// Check to see if anyone wants to cancel
if (mode == NavigationMode.New || mode == NavigationMode.Refresh)
{
if (this.RaiseNavigating(mergedUri, mode, isFragmentNavigationOnly) == true)
{
// Someone stopped us
this.RaiseNavigationStopped(null, mergedUri);
return(true);
}
}
// If the ContentLoader cannot load the new URI, throw an ArgumentException
if (!this.ContentLoader.CanLoad(mappedUri, _currentSourceAfterMapping))
{
throw new ArgumentException(Resource.NavigationService_CannotLoadUri, "uri");
}
if (isFragmentNavigationOnly && this.Host.Content == null)
{
// It doesn't make sense to fragment navigate when there's no content, so raise NavigationFailed
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture,
Resource.NavigationService_FragmentNavigationRequiresContent,
"Frame"));
}
if (isRedirect && this._currentNavigation != null &&
this._currentNavigation.UriForJournal == this._currentSource)
{
// Do not record navigation in the journal in case of a redirection
// where the original target is the current URI.
suppressJournalAdd = true;
}
// Stop in-progress navigation
this.StopLoadingCore(isRedirect);
return(this.NavigateCore_StartNavigation(uri, mode, suppressJournalAdd, mergedUriAfterMapping, mergedUri, isFragmentNavigationOnly));
}
catch (Exception ex)
{
if (this.RaiseNavigationFailed(uri, ex))
{
throw;
}
return(true);
}
}
public WeChatAssociationUriMapper(UriMapperBase upperMapper = null)
{
upper = upperMapper;
}
