Bug 565541 (1/2) - Add targetableShellCount to nsIDocShellTreeOwner. r=bz

Basically, this will return a the number of tabs when nsIDocShellTreeOwner is
a nsContentTreeOwner.

--HG--
extra : rebase_source : b998c4bd81fc95a099dbcd246f4a3df85acd861e

docshell/base/nsIDocShellTreeOwner.idl

@@ -45,7 +45,7 @@
 
 interface nsIDocShellTreeItem;
 
-[scriptable, uuid(bc0eb30e-656e-491e-a7ae-7f460b660c8d)]
+[scriptable, uuid(932f9f93-8e21-4728-a527-cafc64b4d831)]
 interface nsIDocShellTreeOwner : nsISupports
 {
 	/*
@@ -116,4 +116,9 @@ interface nsIDocShellTreeOwner : nsISupports
 	void getPersistence(out boolean aPersistPosition,
                             out boolean aPersistSize,
                             out boolean aPersistSizeMode);
+
+	/*
+	Gets the number of targettable docshells.
+	*/
+	readonly attribute unsigned long targetableShellCount;
 };

embedding/browser/webBrowser/nsDocShellTreeOwner.cpp

@@ -467,6 +467,18 @@ nsDocShellTreeOwner::GetPersistence(PRBool* aPersistPosition,
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
+NS_IMETHODIMP
+nsDocShellTreeOwner::GetTargetableShellCount(PRUint32* aResult)
+{
+  if(mTreeOwner) {
+    mTreeOwner->GetTargetableShellCount(aResult);
+  } else {
+    *aResult = 0;
+  }
+
+  return NS_OK;
+}
+
 //*****************************************************************************
 // nsDocShellTreeOwner::nsIBaseWindow
 //*****************************************************************************   

xpfe/appshell/src/nsChromeTreeOwner.cpp

@@ -357,6 +357,13 @@ nsChromeTreeOwner::GetPersistence(PRBool* aPersistPosition,
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsChromeTreeOwner::GetTargetableShellCount(PRUint32* aResult)
+{
+  *aResult = 0;
+  return NS_OK;
+}
+
 //*****************************************************************************
 // nsChromeTreeOwner::nsIBaseWindow
 //*****************************************************************************   

xpfe/appshell/src/nsContentTreeOwner.cpp

@@ -434,6 +434,14 @@ nsContentTreeOwner::GetPersistence(PRBool* aPersistPosition,
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsContentTreeOwner::GetTargetableShellCount(PRUint32* aResult)
+{
+  NS_ENSURE_STATE(mXULWindow);
+  *aResult = mXULWindow->mTargetableShells.Count();
+  return NS_OK;
+}
+
 //*****************************************************************************
 // nsContentTreeOwner::nsIWebBrowserChrome3
 //*****************************************************************************