private void CleanupAfterNavigationCancelled(NavigateQueueItem localNavigateQueueItem)
{
if (JournalScope != null)
{
JournalScope.AbortJournalNavigation();
}
// If event was canceled then we need to remove it.
// If the event was canceled AND superceded by StopLoading or Navigate, it won't be
// in the list but Remove won't throw an exception so not doing an if check here
// Don't clear the whole list here since this could be an intermediate Navigate in a recursive callstack
// and the caller could now proceed with the navigation
_recursiveNavigateList.Remove(localNavigateQueueItem);
if (_navigatorHostImpl != null)
{
_navigatorHostImpl.OnSourceUpdatedFromNavService(true /* journalOrCancel */);
}
// TFS Dev10 451993 - Browser downloading state not reset; case 4.
InformBrowserAboutStoppedNavigation();
}
// returns whether or not to navigate
private bool HandleNavigating(Uri source, Object content, Object navState, WebRequest newRequest, bool navigateOnSourceChanged)
{
NavigateInfo navigateInfo = navState as NavigateInfo;
if (navigateInfo != null)
{
Debug.Assert(navigateInfo.IsConsistent);
Debug.Assert(source == null ||
navigateInfo.Source == null ||
IsSameUri(null, navigateInfo.Source, source, false /* withFragment */),
"Source argument does not match NavigateInfo.Source");
// Don't want to overwrite one passed in
if (source == null)
{
source = navigateInfo.Source;
}
}
NavigateQueueItem localNavigateQueueItem = new NavigateQueueItem(source,
content,
navigateInfo != null ? navigateInfo.NavigationMode : NavigationMode.New,
navState,
this);
// Set the pending state. _navigateQueue item may get overwritten in a recursive StopLoading
// or Navigate call (called from FireNavigating). If so then we need to cancel this navigation
// since the last StopLoading and Navigate call will supercede this call. We need to cancel
// this navigation is such a case even if this event was not explicitly cancelled
_recursiveNavigateList.Add(localNavigateQueueItem);
// For each new navigation we need to re-determine if we are the initial navigator
_isNavInitiatorValid = false;
// If this is not a navigation started by Source DP change, we notify the INavigatorHost
// that source changed.
if ((_navigatorHostImpl != null) && (!navigateOnSourceChanged))
{
_navigatorHostImpl.OnSourceUpdatedFromNavService(IsJournalNavigation(navigateInfo) /* journalOrCancel */);
}
// Event handler exception continuality: if exception occurs in Navigating event handler, the cleanup action is
// the same as the event being cancelled.
bool allowNavigation = false;
try
{
allowNavigation = FireNavigating(source, content, navState, newRequest);
}
catch
{
CleanupAfterNavigationCancelled(localNavigateQueueItem);
throw;
}
if (allowNavigation == true)
{
DoStopLoading(false /*clearRecursiveLoads*/, true /*fireEvents*/);
Debug.Assert(PendingNavigationList.Count == 0,
"Pending child navigations were not stopped before starting a new navigation");
// NavigationStopped event handler could have caused a new navigation.
if (_recursiveNavigateList.Contains(localNavigateQueueItem) == false)
return false;
_recursiveNavigateList.Clear();
// Continue with the navigation
Debug.Assert(_navigateQueueItem == null, "Previous nav queue item should be cleared by now.");
_navigateQueueItem = localNavigateQueueItem;
_request = newRequest;
_navStatus = NavigationStatus.Navigating;
}
else
{
CleanupAfterNavigationCancelled(localNavigateQueueItem);
}
return allowNavigation;
}