Added a new method to nsIURIContentListener to allow the windowContext listener to get a crack at cancelling a new load that is about to occur.

git-svn-id: svn://10.0.0.236/trunk@63947 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/uriloader/base/nsIURIContentListener.idl

@@ -38,6 +38,17 @@ interface nsIURI;
 [scriptable, uuid(94928AB3-8B63-11d3-989D-001083010E9B)]
 interface nsIURIContentListener : nsISupports
 {
+  /*
+	  Gives the content listener first crack at stopping a load before it
+	  happens.
+	  
+	  aURI --> the uri we are going to try and open.
+	  aWindowTarget --> the window target passed to the uriloader to open.
+	  aAbortOpen --> specifies that the open should be aborted.  
+  */
+  void onStartURIOpen(in nsIURI aURI, in string aWindowTarget, 
+	 out boolean aAbortOpen);
+
   /* Give the content listener first crack at forcing us to use
      a specific content handler. Content listener's do not need to 
      support this method if they want the uri dispatcher to find the

mozilla/uriloader/base/nsURILoader.cpp

@@ -575,6 +575,23 @@ NS_IMETHODIMP nsURILoader::OpenURIVia(nsIChannel * aChannel,
 
   if (!aChannel) return NS_ERROR_NULL_POINTER;
 
+  // Let the window context's uriListener know that the open is starting.  This
+  // gives that window a chance to abort the load process.
+  nsCOMPtr<nsIURIContentListener> winContextListener(do_GetInterface(aOriginalWindowContext));
+  if(winContextListener)
+    {
+    nsCOMPtr<nsIURI> uri;
+    aChannel->GetURI(getter_AddRefs(uri));
+    if(uri)
+      {
+      PRBool abort = PR_FALSE;
+      winContextListener->OnStartURIOpen(uri, aWindowTarget, &abort);
+         
+      if(abort)
+         return NS_OK;
+      }   
+    }
+
   nsCOMPtr<nsISupports> retargetedWindowContext;
   NS_ENSURE_SUCCESS(GetTarget(aWindowTarget, aOriginalWindowContext, getter_AddRefs(retargetedWindowContext)), NS_ERROR_FAILURE);